JP2020092569A - Abnormal current sign detection system and abnormal current sign detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably transmit current measurement value data for detecting the presence or absence of an abnormal current in a facility in which a high-voltage power receiving facility such as a cubicle is arranged, and to cause a ground fault or a short circuit in the facility. It constantly monitors the presence or absence of signs of abnormal current and supports the accurate maintenance of high-voltage power receiving equipment such as cubicles. An abnormal current sign detection system is a current measuring device that measures a current value for detecting a sign of an abnormal current in a facility where a high-voltage power receiving facility is arranged, and a power line that acquires measurement result data of the current value. It includes a communication adapter and an abnormal current detection device that receives measurement result data of a current value transmitted from the power line communication adapter. The abnormal current detection device determines whether or not there is a sign that an abnormal current will occur in the facility based on the measurement result data of the current value for a predetermined period. [Selection diagram] Fig. 1

Description

The present disclosure relates to an abnormal current sign detection system and an abnormal current sign detection method for detecting the presence or absence of a sign of abnormal current in a facility.

In Patent Document 1, an insulating material that is laid under a DC cubicle housing a DC device and insulates between the DC cubicle and the ground, and two ground wires that connect a ground busbar of the DC cubicle to the ground. There is disclosed a ground fault current detection device having a current detection unit that detects a ground fault current flowing through two ground wires at one location. With this configuration, even if the DC cubicle is provided with two grounding lines for safety reasons, it is possible to detect a very small current for catching a sign of a failure in the DC cubicle.

JP, 2005-226357, A

However, the configuration of Patent Document 1 does not consider transmitting a detection value of a minute current to an external device for capturing a sign of an accident (for example, a ground fault) inside a cubicle that is a high-voltage power receiving facility. Also, assuming that wireless communication is used to transmit the data of the detected value of the minute current to the external device, the direct current device housed in the cubicle malfunctions due to the influence of the radio waves emitted during the wireless communication. Or communication failure may occur. In addition, if a ground fault actually occurs in the customer facility where the cubicle is placed, it may lead to a ripple accident depending on the situation. Therefore, from the viewpoint that it is desirable to constantly monitor whether or not there is a sign that a ground fault will occur, it is considered that there is room for improvement as compared with the related art such as Patent Document 1.

The present disclosure has been devised in view of the above-mentioned conventional situation, and stably manages data of current measurement values for detecting the presence or absence of abnormal current in a facility where high-voltage power receiving equipment such as a cubicle is placed in a management device. An abnormal current sign detection system and an abnormal current sign that are transmitted and constantly monitor the presence of signs of abnormal current due to ground faults or short circuits in the facility to support accurate maintenance of high-voltage power receiving equipment such as cubicles. It is intended to provide a detection method.

The present disclosure acquires a current measurement device that measures a current value for detecting a sign of an abnormal current in a facility where high-voltage power receiving equipment is arranged, and obtains measurement result data of the current value measured by the current measurement device. A power line communication adapter, and an abnormal current detection device that is connected to enable power line communication between the power line communication adapter and receives measurement result data of the current value transmitted from the power line communication adapter; The abnormal current detection device provides an abnormal current sign detection system that determines whether there is a sign that the abnormal current will occur in the facility, based on the measurement result data of the current value for a predetermined period.

In addition, the present disclosure includes a step of measuring a current value for detecting a sign of an abnormal current by a current measuring device in a facility where a high-voltage power receiving facility is arranged, and a measurement of the current value measured by the current measuring device. Obtaining the result data by the power line communication adapter, the abnormal current detection device connected to the power line communication adapter to enable power line communication, the measurement result data of the current value transmitted from the power line communication adapter, An abnormal current sign detection method for determining whether there is a sign that an abnormal current will occur in the facility based on the step of receiving and the abnormal current detection device, based on the measurement result data of the current value for a predetermined period. To do.

According to the present disclosure, data of measured current values for detecting the presence or absence of abnormal current can be stably transmitted to a management device in a facility where high-voltage power receiving equipment such as a cubicle is arranged, so that a ground fault in the facility or It is possible to constantly monitor the presence or absence of a sign that an abnormal current will occur due to a short circuit, etc., and it is possible to support accurate maintenance of high-voltage power receiving equipment such as cubicles.

The figure which shows the structural example of the abnormal current sign detection system which concerns on Embodiment 1. Diagram showing installation example of cubicle in abnormal current sign detection system Diagram showing the detailed configuration of high-voltage power receiving equipment Diagram showing the hardware configuration of the PLC adapter Sequence diagram showing an example of a ground fault short-circuit detection operation procedure according to the first embodiment The flowchart which shows an example of the learning procedure of the sign detection algorithm which concerns on Embodiment 1. Sequence diagram showing an example of a ground fault short-circuit detection operation procedure according to the second embodiment.

Hereinafter, an embodiment specifically disclosing the configuration and operation of the abnormal current sign detection system and the abnormal current sign detection method according to the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters or duplicate description of substantially the same configuration may be omitted. This is to prevent the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the claimed subject matter by them.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration example of an abnormal current sign detection system 5 according to the first embodiment. The abnormal current sign detection system 5 detects the presence or absence of an abnormal current occurrence sign based on a ground fault or a short circuit that occurs in the high voltage power receiving equipment 8 (see FIG. 3) including the cubicle 200. As shown in FIG. 1, a branch switch 210, a section switch 205 (see FIG. 3), and a ground fault relay 240 are installed on a utility pole 700 that supports high-voltage electric wires. The abnormal current detection system 5 may be applied not to the high voltage power receiving equipment 8 including the cubicle 200 but to an open type high voltage power receiving equipment, for example.

The branch switch 210 opens and closes an electric path for branching the high-voltage electric wire supported by the electric pole 700.

The division switch 205 is installed at the responsibility demarcation point between the electric power company and the private electric equipment, and opens and closes the electric path of the high voltage electric wire. The cubicle 200 is connected to the division switch 205 via a lead-in cable 245 (see FIG. 3 ).

The ground fault relay 240 detects a ground fault caused by the contact between the electric line of the high voltage electric wire and the ground Ea, and interrupts the electric line.

The cubicle 200 has a metal box-shaped casing, receives high-voltage (for example, 6600V) electricity transmitted from a substation, transforms it into low-voltage (for example, 100V or 200V) electricity, and meets various demands. The low voltage electricity is supplied to the building 800 in the facility 900 of the house (one aspect of the user).

The abnormal current sign detection system 5 includes a ground fault current measuring device 230 provided outside the cubicle 200 and a ground fault detection PLC (Power Line Communication) adapter 255 provided inside the cubicle 200.

The ground fault current measuring device 230 includes a zero-phase current transformer (ZCT: Zero-phase Current Transformer) 231 built in the section switch 205 and the above-mentioned ground fault relay (DGR: Directional Ground Relays) 240.

The zero-phase current transformer 231 detects, for example, a zero-phase current at the time of a ground fault. In the zero-phase current transformer 231, for example, when three-phase electric wires of R phase, S phase, and T phase penetrate the zero-phase current transformer 231, and a ground fault occurs in any one line, the balance of the three phases is generated. It collapses and the vector sum of the current in each phase does not become zero. Then, as the ground fault current flows, the zero-phase current transformer 231 outputs a non-ground fault current to the secondary side. In the following description, an ungrounded current is a current that has not yet reached the ground fault, including a current in the previous stage that is likely to reach the ground fault. Similarly, the unshort-circuited current is a current that has not yet been short-circuited, including a current at a previous stage that is likely to short-circuit.

The ground fault relay 240 measures the ungrounded current detected by the zero-phase current transformer 231, and outputs the measured ungrounded current signal at regular intervals (for example, once a day or once a hour). Times) It transmits to the ground fault detection PLC adapter 255. For this transmission, for example, a transmission cable 240m of communication standard RS485 connected between the ground fault relay 240 and the ground fault detection PLC adapter 255 and performing serial communication excellent in noise resistance is used.

Upon receiving the ungrounded current signal from the ground fault relay 240, the ground fault detection PLC adapter 255 generates a PLC signal of ungrounded current information, and transmits the ungrounded current information of the ungrounded current information by power line communication via the power line Ln. Send the PLC signal. This PLC signal includes the identification information of the ground fault current measuring device 230 (zero-phase current transformer 231, the ground fault relay 240) or the identification information of the cubicle 200 provided with the ground fault detection PLC adapter 255. The ground fault detection PLC adapter 255 is connected to the power line Ln connected to the secondary side of the transformer 254 in the cubicle 200, and operates based on the power supplied from the transformer 254 via the power line Ln.

The abnormal current sign detection system 5 includes a short circuit current measuring device 250 and a short circuit detection PLC adapter 265 provided inside the cubicle 200. The cubicle 200 is provided with a vacuum circuit breaker (VCB: Vacuum Circuit Breakers) 253 to which an end of the lead-in cable 245 is connected, and a transformer (T: Transformers) 254.

The vacuum circuit breaker 253 interrupts the high voltage current flowing between the electrodes housed in the vacuum container.

The transformer 254 transforms high-voltage (for example, 6600V) electricity into low-voltage (for example, 100V or 200V) electricity and supplies low-voltage electricity to the power line Ln.

The short-circuit current measuring device 250 includes an instrument current transformer (CT: Current Transformers) 251 and an overcurrent relay (OCR: Over Current Relays) 252.

The instrument current transformer 251 converts the value of the high voltage current into a small value in order to expand the measurement range of the high voltage current.

The overcurrent relay 252 cuts off the electric path when the unshorted current obtained by the current transformer 251 exceeds the established current due to a short circuit or the like. Here, the established current is a limit value of the operating current when a short circuit occurs.

The overcurrent relay 252 measures the unshort-circuit current detected by the current transformer 251 for a meter, and measures the measured short-circuit current value at regular intervals (for example, once a day or once an hour). It transmits to the short circuit detection PLC adapter 265. For this transmission, for example, a transmission cable 252m of communication standard RS485 connected between the overcurrent relay 252 and the short-circuit detection PLC adapter 265 and performing serial communication excellent in noise resistance is used.

Upon receiving the unshort-circuit current signal from the overcurrent relay 252, the short-circuit detection PLC adapter 265 generates a PLC signal of unshort-circuit current information and transmits the PLC signal of unshort-circuit current information by power line communication via the power line Ln. .. This PLC signal includes the identification information of the short-circuit current measuring device 250 (the current transformer 251 for the meter, the overcurrent relay 252) or the identification information of the cubicle 200 provided with the PLC adapter 265 for detecting the short circuit. The short-circuit detection PLC adapter 265 is connected to the power line Ln connected to the secondary side of the transformer 254 in the cubicle 200, and operates based on the power supplied from the transformer 254 via the power line Ln.

The abnormal current sign detection system 5 includes an outlet 380, an indoor PLC adapter 350, an edge PC (personal computer) 300, a router 360, and a user terminal 370 installed in the building 800 of each user.

The outlet 380 is an outlet for taking electricity from indoor wiring connected to the power line Ln drawn from the transformer 254 in the cubicle 200.

The indoor PLC adapter 350 uses the power line communication via the power line Ln and the outlet 380 to transmit the ungrounded current information transmitted from the ground fault detection PLC adapter 255 and the unshorted current information transmitted from the short circuit detection PLC adapter 265. To receive. The router 360 connects the edge PC 300 to the wide area network NW or the user terminal 370.

The user terminal 370 is a user-operable PC (Personal Computer), smartphone, tablet terminal, or the like, and displays an alert notified from the edge PC 300 when a sign of a ground fault or a short circuit is detected to notify the user. To do. The user terminal 370 may notify the user of the alert by voice.

The edge PC 300 is a desktop PC that detects a sign of a ground fault or a short circuit, and includes a processor 310, a memory 311, a storage unit 312, a communication circuit 313, and an operation unit 314. Further, a display 315 capable of displaying various information processed by the processor 310 is connected to the edge PC 300.

The storage unit 312 stores a program and data capable of executing the sign detection algorithm. The processor 310 activates the sign detection algorithm according to a program and data capable of executing the sign detection algorithm stored in the storage unit 312, and transmits the ungrounded current information and the unshort-circuited current information transmitted via the indoor PLC adapter 350. Based on, the presence or absence of a sign of ground fault or short circuit is determined. The memory 311 is used as a working memory of the processor 310. The operation unit 314 receives a user operation.

The communication circuit 313 can communicate with the user terminal 370 via the router 360. When the user terminal 370 is a wireless mobile terminal such as a smartphone, the communication circuit 313 can communicate with the user terminal 370 via the mobile communication network. The communication circuit 313 can communicate with the learning detection server 400, the management company server 500, and the weather information management server 600, which are connected via the router 360 and the wide area network NW. The management company server 500 manages the ungrounded current information and unshorted current information in the high-voltage power receiving equipment 8 at various locations. The weather information management server 600 provides weather data via the wide area network NW.

The abnormal current sign detection system 5 includes a learning detection server 400 connected to the wide area network NW. The learning detection server 400 has a processor 410, a memory 411, a storage 412, and a communication circuit 413. The memory 411 is used as a working memory of the processor 410. The storage 412 is a large-capacity storage device.

The processor 410 determines whether there is a sign of a ground fault or a short circuit based on the ungrounded current information (data) and the unshorted current information (data) received via the wide area network NW and the communication circuit 413. The processor 410, via the network NW from the edge PC 300, the ground fault data when a ground fault occurs and the ungrounded data before that, and the short circuit data when a short circuit occurs and the unshorted data before that. To receive.

The processor 410 stores, in the storage 412, the received ground fault data and the ungrounded data in the preceding stage, and the short-circuited data and the unshorted data in the preceding stage as learning data. The processor 410 includes parameters such as date and time of occurrence of ground fault or short circuit, current value, weather condition at the time of occurrence, time after installation of equipment and electric wire, identification information of high-voltage power receiving equipment, and the like in the learning data. The processor 310 performs machine learning such as deep learning based on the accumulated learning data and generates a learned model md. The processor 410 inputs the ungrounded current information and the unshorted current information to the learned model md, and acquires the determination result of the presence/absence of a sign that at least one of a ground fault and a short circuit will occur as its output. .. In addition, although the case where the learning detection server performs the learning of the ungrounded fault and the unshorted circuit is shown here, the edge PC 300 may perform the learning.

FIG. 2 is a diagram showing an installation example of the cubicle 200 in the abnormal current sign detection system 5. In the high-voltage power receiving equipment 8 to which the abnormal current sign detection system 5 is applied, as the building 800 in the facility 900, for example, a structure 810 such as a building or a condominium, a store 820 such as a plurality of convenience stores, a factory 830, or the like, the cubicle 200. Are installed respectively.

A cubicle 200A to which a high voltage cable 295A drawn from a utility pole 700A is connected is installed on the roof of a structure 810 such as a building or an apartment. A cubicle 200B to which a high-voltage cable 295B drawn from a telephone pole 700B is connected is installed near a store 820 such as a plurality of convenience stores. In the factory 830, a cubicle 200C to which the high voltage cable 295C drawn from the electric pole 700C is connected is installed adjacent to the factory 830.

Each of the cubicles 200A, 200B, and 200C receives high-voltage electricity through the high-voltage cables 295A, 295B, and 295C from the partition switches 205 installed on the power poles 700A, 700B, and 700C, respectively. Each of the cubicles 200A, 200B, and 200C transforms high-voltage electricity into low-voltage electricity by the transformer 254, and supplies low-voltage electricity to each building 800 (structure 810, a plurality of stores 820. factory 830).

In addition, each of the cubicles 200A, 200B, and 200C is provided with a ground fault detection PLC adapter 255 and a short circuit detection PLC adapter 265. Each of the ground fault detection PLC adapter 255 and the short circuit detection PLC adapter 265 uses the obtained ungrounded current information and unshorted current information in each building 800 (structure 810, store 820, factory 830) by power line communication. To the edge PC 300 provided in the.

FIG. 3 is a diagram showing a detailed configuration of the high voltage power receiving equipment 8. The high-voltage power receiving equipment 8 includes a division switch 205, a ground fault relay 240, a lead-in cable 245, and a cubicle 200. The high voltage electric wire supported by the electric pole 700 is branched by the branch switch 210. The high-voltage electric wire branched by the branch switch 210 is connected to the section switch 205 installed in the first pillar 750. A ground fault relay 240 connected to the division switch 205 is installed on the first pillar 750. The division switch 205 includes a zero-phase voltage detector (ZPD: Zero-Phase-Sequence Potential Device) 233, a voltage transformer 234, a current transformer 235, and a lightning arrester element 236.

The zero-phase voltage detector 233 detects a zero-phase voltage.

The voltage transformer 234 transforms the high voltage into a manageable low voltage.

The current transformer 235 for a meter converts a large current into a manageable small current.

The lightning protection element 236 protects from a transient high voltage caused by lightning or the like.

The ground fault relay 240 transmits the ungrounded current signal detected by the zero-phase current transformer 231 to the PLC adapter 255 for ground fault detection. The start end of the lead-in cable 245 is connected to the partition switch 205, and the end thereof is connected to the cubicle 200.

The cubicle 200 includes the above-described vacuum circuit breaker 253, transformer 254, instrument current transformer 251, overcurrent relay 252, ground fault detection PLC adapter 255, and short circuit detection PLC adapter 265, as well as a disconnector 268 and a voltage. It includes a transformer 271, a high voltage circuit breaker 278, a lightning arrester 256, a high voltage load switch 279, a high voltage cutout 281, a series reactor 258, a phase advance capacitor 257 and a power fuse 288. These electronic components are used for the following purposes.

The disconnector 268 (DS: Disconnecting Switches) releases the load from the high-voltage electricity circuit when a short circuit occurs.

A voltage transformer 271 (VT: Voltage Transformers) transforms a high voltage into a low voltage that is easy to handle.

The high-voltage circuit breaker 278 (CB: Circuit Breaker) extinguishes the arc when opening and closing.

An instrument current transformer 251 (CT: Current Transformers) converts a large current into a small current that is easy to handle.

The lightning arrester 256 (LA: Lightning Arresters) protects against a transient high voltage caused by lightning or the like.

The high voltage load switch 279 (LBS: Load Break Switches) opens and closes the load connected to the transformer 254.

A high voltage cutout 281 (PC: Power Cutout) protects against overload.

The series reactor 258 (SR: Series Reactor) suppresses an inrush current due to opening/closing of the phase advance capacitor 257.

The phase advancing capacitor 257 (SC: Static Capacitor) improves the power factor on the load side.

A power fuse 288 (PF: Power Fuses) cuts off a short-circuit current.

FIG. 4 is a diagram showing a hardware configuration of the PLC adapter 10 corresponding to the ground fault detection PLC adapter 255 and the short circuit detection PLC adapter 265. In the description of FIG. 4, the ground fault detection PLC adapter 255 and the short circuit detection PLC adapter 265 are collectively referred to as the PLC adapter 10.

The PLC adapter 10 has a circuit module 30 and a switching power supply 20.

The switching power supply 20 supplies various voltages (for example, +1.2V, +3.3V, +12V) to the circuit module 30, and includes, for example, a switching transformer and a DC-DC converter (all not shown). Power to the switching power supply 20 is supplied from the power supply connector 21 via the impedance upper 27 and the AC/DC converter 24. The power connector 21 is provided on the back surface of the housing 100 of the PLC adapter 10, for example.

The circuit module 30 includes a main IC (Integrated Circuit) 11 and an AFE/IC (Analog Front END Integrated Circuit) 12. The circuit module 30 includes a low pass filter (LPF: Low Pass Filter) 13, a driver IC 15, a coupler 16, a band pass filter (BPF: Band Pass Filter) 17, and a memory 18. The circuit module 30 includes an Ethernet (registered trademark) PHY/IC (Physical layer Integrated Circuit) 19 and an AC cycle detector 60.

The coupler 16 is connected to the power supply connector 21, and further connected to the power line 1A via the power supply cable 1B, the power supply plug 25, and the outlet 2. The LED 23 operates as a display unit and is connected to the main IC 11. A LAN cable 26 for connecting to various devices (for example, a personal computer) is connected to the modular jack 22. The modular jack 22 is provided on the back surface of the housing 100, for example. The LED 23 is provided on the front surface of the housing 100, for example.

The main IC 11 includes a CPU (Central Processing Unit) 11A, and PLC/MAC (Power Line Communication Media Access Control Layer) blocks 11C1 and 11C2. The main IC 11 also includes PLC/PHY (Power Line Communication Physical Layer) blocks 11B1 and 11B2.

The CPU 11A mounts a 32-bit RISC (Reduced Instruction Set Computer) processor. The PLC/MAC block 11C2 manages the MAC layer (Media Access Control Layer) of the transmission signal, and the PLC/MAC block 11C1 manages the MAC layer of the reception signal. The PLC/PHY block 11B2 manages the PHY layer (Physical Layer) of the transmission signal, and the PLC/PHY block 11B1 manages the PHY layer of the reception signal.

The AFE/IC 12 includes a DA converter (DAC: Digital to Analog Converter) 12A, an AD converter (ADC: Analog to Digital Converter) 12D, and variable amplifiers (VGA: Variable Gain Amplifier) 12B, 12C.

The coupler 16 includes a coil transformer 16A and coupling capacitors 16B and 16C. The CPU 11A uses the data stored in the memory 18 to control the operations of the PLC/MAC blocks 11C1 and 11C2 and the PLC/PHY blocks 11B1 and 11B2 to control the entire PLC adapter 10.

In FIG. 4, the PLC adapter 10 includes the PLC/MAC blocks 11C1 and 11C2 and the PLC/PHY blocks 11B1 and 11B2, which are used for transmission and reception, respectively. Alternatively, the PLC adapter 10 may include a PLC/MAC block 11C and a PLC/PHY block 11B (not shown), which may be commonly used for transmission and reception.

The PLC/MAC blocks 11C1 and 11C2 are also simply referred to as the PLC/MAC block 11C. The PLC/PHY blocks 11B1 and 11B2 are also simply referred to as PLC/PHY blocks 11B.

The main IC 11 is an electric circuit (LSI: Large Scale Integration) that performs signal processing including basic control or modulation/demodulation, for example, similar to a general modem. For example, the main IC 11 modulates the reception data output from the communication terminal (for example, PC) via the modular jack 22 and outputs it to the AFE/IC 12 as a transmission signal (data). Further, the main IC 11 demodulates a signal input from the power line 1A side via the AFE/IC 12 as a reception signal (data) and outputs the signal to the communication terminal (for example, PC) via the modular jack 22.

The AC cycle detector 60 generates a synchronization signal necessary for each PLC adapter 10 to control at a common timing. The AC cycle detector 60 includes a diode bridge 60a, resistors 60b and 60c, a DC (Direct Current) power supply unit 60e, and a capacitor 60d.

The diode bridge 60a is connected to the resistor 60b. The resistor 60b is connected in series with the resistor 60c. The resistors 60b and 60c are connected in parallel to one terminal of the capacitor 60d. The DC power supply unit 60e is connected to the other terminal of the capacitor 60d.

Specifically, the generation of the synchronization signal by the AC cycle detector 60 is performed as follows. That is, the zero-cross point of the voltage of the AC power waveform AC (AC waveform consisting of a sine wave of 50 Hz or 60 Hz) of the commercial power supplied to the power line 1A is detected, and a synchronization signal is generated with the timing of the zero-cross point as a reference. An example of the synchronization signal is a rectangular wave composed of a plurality of pulses synchronized with the zero-cross point of the AC power waveform.

The AC cycle detector 60 is not essential. In this case, the synchronization between the PLC adapters 10 uses, for example, a synchronization signal included in the communication signal.

The communication by the PLC adapter 10 is generally performed as follows.

The data input from the modular jack 22 is sent to the main IC 11 via the Ethernet (registered trademark) PHY/IC 19 and subjected to digital signal processing to generate a digital signal. The generated digital signal is converted into an analog signal by the DA converter 12A of the AFE IC12. The converted analog signal is output to the power line 1A (for example, the power line Ln shown in FIG. 1) via the low-pass filter 13, the driver IC 15, the coupler 16, the power connector 21, the power cable 1B, the power plug 25, and the outlet 2.

In addition, the signal received from the power line 1A is sent to the bandpass filter 17 via the coupler 16, the gain is adjusted by the variable amplifier 12C of the AFE/IC 12, and then converted into a digital signal by the AD converter 12D. .. The converted digital signal is sent to the main IC 11 and subjected to digital signal processing to be converted into digital data. The converted digital data is output from the modular jack 22 via the Ethernet (registered trademark) PHY/IC 19.

Next, an operation procedure of the abnormal current sign detection system 5 according to the first embodiment will be described.

FIG. 5 is a sequence diagram showing an example of a ground fault short circuit detection operation procedure according to the first embodiment.

In FIG. 5, the ground fault detection PLC adapter 255 receives the current value of the non-ground fault current signal transmitted from the ground fault current measuring device 230 at regular intervals (T1). The ground fault detection PLC adapter 255 generates a PLC signal of ungrounded current information including the current value of the ungrounded current signal (T2). The ground fault detection PLC adapter 255 transmits the PLC signal of the ungrounded current information to the indoor PLC adapter 350 in the building 800 through the power line Ln and the outlet 380 by power line communication (T3).

The short-circuit detection PLC adapter 265 receives the current value of the non-short-circuit current signal transmitted from the short-circuit current measuring device 250 at regular intervals (T4). The short-circuit detection PLC adapter 265 generates a PLC signal of unshort-circuit current information including the current value of the unshort-circuit current signal (T5). The short-circuit detection PLC adapter 265 transmits the PLC signal of the unshort-circuit current information to the indoor PLC adapter 350 in the building 800 through the power line Ln and the outlet 380 by power line communication (T6). The ungrounded current signal transmitted from the ground fault current measuring device 230 at regular intervals and the unshorted current signal transmitted from the short circuit current measuring device 250 at regular periods may have the same timing or different. It may be the timing.

When the indoor PLC adapter 350 receives the PLC signal of the ungrounded current information or the PLC signal of the unshorted current information through the power line Ln and the outlet 380, the indoor PLC adapter 350 follows the communication method of the short-range communication and follows the ungrounded current information or the unshorted current. An information signal (an example of a first interface signal) is generated (prepared) (T7). In the drawings of the attached drawings, the interface is abbreviated as “IF”. As the narrow area communication, for example, a wireless LAN (Local Area Network) such as Wifi (registered trademark) or a wired LAN such as Ethernet (registered trademark), or a combination thereof is used. The indoor PLC adapter 350 transmits the first interface signal to the edge PC 300 by the short-range communication (T8). The first interface signal includes the identification information of the cubicle 200 or the identification information of the ground fault current measuring device 230 or the short circuit current measuring device 250 included in the ungrounded current information or the unshorted current information.

The edge PC 300 generates (prepares) a signal (an example of the second interface signal) of the ungrounded current information or the unshorted current information according to the communication method of the wide area network NW (T9). As the wide area communication, for example, mobile communication such as 4G, wired WAN (Wide Area Network), or a combination thereof is used. The edge PC 300 transmits the second interface signal to the learning detection server 400 by wide area communication (T10). The second interface signal includes the identification information of the cubicle 200, or the identification information of the ground fault current measuring device 230 or the short circuit current measuring device 250. As a result, the learning detection server 400 can recognize which cubicle 200 has generated the ungrounded current information or the unshorted current information.

The learning detection server 400 inputs the ungrounded current information and the unshorted current information to the learned model md according to the sign detection algorithm, and based on the result such as the score obtained as the output thereof, each of the ground fault and the short circuit. The presence or absence of a sign is determined (T11). Further, the processor 410 of the learning detection server 400 stores the ungrounded current information or unshorted current information included in the second interface signal in the storage 412 as learning data.

When the learning detection server 400 determines that there is a sign of at least one of a ground fault and a short circuit, the learning detection server 400 notifies the user terminal 370 of an alert (for example, a warning sound or a message indicating a warning) via the wide area network NW. Yes (T12). The alert includes information such as a date when a ground fault or a short circuit is predicted to occur. Furthermore, the learning detection server 400 notifies the management company server 500 of an alert via the wide area network NW (T13). The learning detection server 400 notifies the edge PC 300 of an alert via the wide area network NW (T14). The alerts notified in steps T12, T13, and T14 may be performed at the same time, may be performed in different orders, or may be performed at intervals. In addition, when the learning detection server 400 determines that there is no sign of a ground fault or a short circuit, it may be left as it is, or the user terminal 370, the management company server may indicate that there is no sign of a ground fault or a short circuit. You may notify 500 and edge PC300.

FIG. 6 is a flowchart showing a learning procedure of the sign detection algorithm according to the first embodiment. The same steps (steps) in the ground fault short-circuit detection operation procedure shown in FIG. 5 are assigned the same step numbers to simplify or omit the description, and different points will be described. Learning of the sign detection algorithm is performed by the learning detection server 400.

In FIG. 6, when the processor 410 of the learning detection server 400 receives the second interface signal from the edge PC 300 via the communication circuit 413 in step T10, the ungrounded current information and unshorted current information included in the second interface signal. Based on, the sign detection algorithm is learned (T51). As a result of learning, the processor 410 updates various parameters forming the learned model md with respect to the learned model md generated using past accumulated data (T52). In updating various parameters forming the learned model md, for example, when the learned model md is formed of a neural network, the weighting coefficient of each neuron forming each layer (input layer, intermediate layer, output layer) is calculated. The process of optimizing is performed.

As described above, the abnormal current sign detection system 5 according to the first embodiment does not reach the ground fault, but when the ungrounded current that causes the ground fault if left unattended is detected, the ungrounded current is detected. A record of information is accumulated in the learning detection server 400 outside the cubicle 200. Similarly, the abnormal current sign detection system 5 records the unshorted current information outside the cubicle 200 when an unshorted current that does not result in a short circuit but causes a short circuit if left unattended is recorded outside the cubicle 200. It is accumulated in the learning detection server 400. The ungrounded current information and unshort-circuited current information include information such as date and time of occurrence, current value, weather conditions at the time of occurrence, high-voltage power receiving equipment, period after construction of electric wire, cubicle, identification information of high-voltage power receiving equipment, etc. .. The learning detection server 400 performs machine learning based on the learning data accumulated in large quantities, and generates and updates the learned model md. The learning detection server 400 uses the learned model md, and an alert including a predicted date before the ungrounded current or unshorted current exceeds the established current (operating current when a ground fault or short circuit occurs). To send.

According to the abnormal current sign detection system 5, the sign detection accuracy of the ground fault or the short circuit can be improved by learning the sign detection algorithm capable of detecting the signs of each of the ground fault and the short circuit. Further, since the ungrounded current and the unshorted current can be detected and these data can be accumulated, it is possible to grasp the tendency before the occurrence of each of the ground fault and the short circuit. Further, the presence or absence of a sign can be determined before occurrence of either a ground fault or a short circuit, and it is possible to prevent a ground fault accident or a short circuit accident, which causes enormous damage, and a spread accident which causes a power outage or the like in a wide range.

Further, by communicating with a power line (for example, an existing AC100V power line), it is possible to perform predictive maintenance of a ground fault or a short circuit at low cost without laying a dedicated communication line. In addition, since high-voltage power receiving equipment including cubicles are often installed in a deep space in a building, wireless communication is susceptible to electric fields and magnetic fields due to high-voltage power reception, and there is a risk of communication failure. However, by performing power line communication, the risk of communication failure is significantly reduced and stable communication becomes possible.

As described above, the abnormal current sign detection system 5 according to the first embodiment measures the ungrounded current (an example of the first current value) for detecting the sign of the abnormal current in the facility 900 in which the cubicle 200 is arranged. It has a ground fault current measuring device 230 (an example of a first current measuring device). The abnormal current sign detection system 5 includes a ground fault detection PLC adapter 255 (an example of a first power line communication adapter) that acquires measurement result data of an ungrounded current measured by the ground fault current measuring device 230. The abnormal current sign detection system 5 is transmitted from the ground fault detection PLC adapter 255 via the indoor PLC adapter 350 and the edge PC 300 which are connected to the ground fault detection PLC adapter 255 so as to enable power line communication. The learning detection server 400 (an example of an abnormal current detection device) that receives the measurement result data of the ground fault current is included. The learning detection server 400 determines whether there is a sign that an abnormal current will occur in the facility 900 based on the measurement result data of the ungrounded current for a predetermined period.

Thereby, the abnormal current sign detection system 5 stably learns the measurement result data of the current value (for example, the ungrounded current) for detecting the presence/absence of the abnormal current in the facility 900 in which the cubicle 200 is arranged. Since it can be transmitted to 400 (an example of a management device), it is possible to constantly monitor the presence or absence of a sign that an abnormal current will occur in the facility 900, and it is possible to support accurate maintenance of the cubicle 200. Furthermore, according to the abnormal current sign detection system 5, it is possible to prevent a ripple accident due to the abnormal current of the high-voltage power receiving equipment 8 in advance.

The measurement result data of the ungrounded current from the ground fault current measuring device 230 is input to the ground fault detection PLC adapter 255 via the transmission cable 240m of the communication standard RS485. As a result, the measurement result data of the ungrounded current is transmitted via the transmission cable 240m of the communication standard RS485 excellent in noise resistance, so that it is less susceptible to noise.

In addition, when the learning detection server 400 determines a sign that an abnormal current occurs, the learning detection server 400 is communicably connected to the learning detection server 400, the user terminal 370, the edge PC 300, and the management company server 500 (at least one unit). To an alert). Thus, the user, the facility manager, and the person in charge of the management company can immediately notice the occurrence sign of the abnormal current.

Further, the ground fault current measuring device 230 measures an ungrounded current for detecting a sign of a ground fault in the facility 900 in which the high voltage power receiving equipment is arranged. The ground fault detection PLC adapter 255 acquires the measurement result data of the ungrounded current measured by the ground fault current measuring device 230. The learning detection server 400 is connected to the ground fault detection PLC adapter 255 so as to be able to perform power line communication, receives the measurement result data of the ungrounded current transmitted from the ground fault detection PLC adapter 255, and then receives the data for a predetermined period. Based on the measurement result data of the minute ungrounded current, the presence/absence of a sign of occurrence of a ground fault in the facility 900 is determined. Accordingly, the abnormal current sign detection system 5 can stably transmit the measurement result data of the ungrounded current for detecting the presence or absence of the ground fault in the facility 900 in which the cubicle 200 is arranged to the learning detection server 400. Therefore, it is possible to constantly monitor the presence or absence of a sign that a ground fault will occur in the facility 900, and it is possible to support accurate maintenance of the cubicle 200. Further, according to the abnormal current sign detection system 5, it is possible to prevent a ripple accident due to a ground fault of the high voltage power receiving equipment 8.

The ground fault detection PLC adapter 255 is arranged in the cubicle 200. As a result, it is possible to prevent the PLC adapter 255 for ground fault detection from being exposed to the external environment, and it becomes unnecessary to take dustproof measures or waterproof measures.

Further, the ground fault detection PLC adapter 255 operates based on the electric power supplied from the secondary side of the transformer 254 arranged in the cubicle 200. Thereby, it is not necessary to separately prepare a power source for the ground fault detection PLC adapter 255, and the ground fault detection PLC adapter 255 can be easily installed.

Further, the learning detection server 400 uses the ungrounded current information for a predetermined period (including the measurement result data of the ungrounded current) to learn the model md for learning whether or not there is a sign that a ground fault will occur. (One example of the first sign detection model) is learned. As a result, the abnormal current sign detection system 5 can update the learned model md by learning the ungrounded current information, and determines the presence or absence of the sign of the ground fault according to the sign detection algorithm to detect the sign of the ground fault. The accuracy of can be improved.

Further, the abnormal current sign detection system 5 measures the short-circuit current measuring device 250 (second example of the second current value) for detecting the sign of the short circuit in the facility 900 in which the cubicle 200 is arranged (second example). An example of a current measuring device) is further included. The abnormal current sign detection system 5 further includes a short-circuit detection PLC adapter 265 (an example of a second power line communication adapter) that acquires measurement result data of an unshort-circuit current measured by the short-circuit current measuring device 250. The learning detection server 400 determines whether or not there is a sign that a short circuit will occur in the facility 900, based on the measurement result data of the unshorted current for a predetermined period. Thereby, the abnormal current sign detection system 5 stably learns the measurement result data of the unshort-circuited current for detecting the presence or absence of a short circuit in the facility 900 in which the cubicle 200 is arranged (an example of a management device). Therefore, it is possible to constantly monitor the presence or absence of a sign that a short circuit will occur in the facility 900, and it is possible to support accurate maintenance of the cubicle 200. Further, according to the abnormal current sign detection system 5, it is possible to prevent a ripple accident due to a short circuit of the high voltage power receiving equipment 8.

Further, the measurement result data of the unshort-circuit current from the short-circuit current measuring device 250 is input to the short-circuit detecting PLC adapter 265 via the transmission cable 252m of the communication standard RS485. As a result, the measurement result data of the unshort-circuit current is transmitted via the transmission cable 240m of the communication standard RS485 excellent in noise resistance, so that it is less likely to be affected by noise.

In addition, when the learning detection server 400 determines a sign that a short circuit will occur, the learning detection server 400 is communicably connected to the learning detection server 400, the user terminal 370, the edge PC 300, and the management company server 500 (at least one unit). Notify the alert to an example of an external device). As a result, the user, the facility manager, and the person in charge of the management company can immediately notice the sign of the short circuit.

The short-circuit detection PLC adapter 265 is arranged in the cubicle 200. As a result, according to the abnormal current sign detection system 5, it is possible to prevent the short-circuit detection PLC adapter 265 from being exposed to the external environment, and there is no need for dustproof measures or waterproof measures.

The short-circuit detection PLC adapter 265 operates based on the electric power supplied from the secondary side of the transformer 254 arranged in the cubicle 200. Thereby, it is not necessary to separately prepare a power source for the short-circuit detection PLC adapter 265, and the short-circuit detection PLC adapter 265 can be easily installed.

In addition, the learning detection server 400 uses the unshort-circuited current information (including the measurement result data of the unshort-circuited current) for a predetermined period of time to learn the learned model md (second Learn an example of a predictive detection model). As a result, the abnormal current sign detection system 5 can learn the unshorted current information and update the learned model md. By determining the presence or absence of the sign of the short circuit according to the sign detection algorithm, the accuracy of the short circuit sign detection can be improved. Can be increased.

Further, the learning detection server 400 is a server connected via the wide area network NW to an edge PC 300 (an example of an information processing device) that performs power line communication between the ground fault detection PLC adapter 255 and the short circuit detection PLC adapter 265. Is. As a result, the distant learning detection server 400 connected via the wide area network NW can use the learned model md to determine the presence/absence of each sign of ground fault and short circuit in a plurality of facilities. Therefore, according to the abnormal current sign detection system 5, the sign accuracy can be improved and efficient operation can be performed.

(Embodiment 2)
In the first embodiment, an example has been described in which the presence/absence of each sign of a ground fault and a short circuit is detected, and the sign detection algorithm is learned to improve the detection accuracy of the presence/absence of a sign. In the second embodiment, an example will be described in which the presence/absence of each sign of a ground fault and a short circuit is simply detected using a learned sign detection algorithm. Therefore, in the second embodiment, the configuration of the learning detection server shown in FIG. 1 may be omitted.

FIG. 7 is a sequence diagram showing an example of a ground fault short circuit detection operation procedure according to the second embodiment. The same steps (steps) in the ground fault short-circuit detecting operation procedure according to the first embodiment are given the same step numbers to simplify or omit the description, and different points will be described.

7, in step T8, the processor 310 of the edge PC 300 receives the first interface signal transmitted from the indoor PLC adapter 350 via the communication circuit 313. The processor 310 determines the presence/absence of each sign of the ground fault and the short circuit based on the sign detection algorithm based on the ungrounded current information and the unshorted current information included in the first interface signal (T61).

When the processor 310 of the edge PC 300 determines that there is a sign of at least one of a ground fault and a short circuit, the processor 310 notifies the user terminal 370 of an alert (warning) via the communication circuit 313 (T62). Further, the processor 310 of the learning detection server 400 notifies the management company server 500 of an alert via the communication circuit 313 and the wide area network NW (T63). If the edge PC 300 determines that there is no sign of a ground fault or a short circuit, the edge PC 300 may leave it as it is, or notify the user terminal 370 and the management company server 500 that there is no sign of a ground fault or a short circuit. You may notify.

The processor 310 displays an alert on the display 315 (T64). The user can recognize that there is a sign of at least one of a ground fault and a short circuit by looking at the alert displayed on the display 315. Therefore, the user can quickly deal with the problem in the facility 900.

As described above, in the abnormal current sign detection system 5 according to the second embodiment, the edge PC 300 detects the presence or absence of each sign of the ground fault and the short circuit, and therefore the learning detection server 400 shown in FIG. The configuration of the current sign detection system 5 can be simplified. In addition, by simplifying the system configuration, the abnormal current sign detection system 5 can be realized at low cost.

As described above, the edge PC 300 (an example of the abnormal current detection device) according to the second embodiment is an information processing device that performs power line communication with the ground fault detection PLC adapter 255 and the short circuit detection PLC adapter 265. As a result, the system configuration can be simplified and the cost can be reduced. Further, even in the simplified abnormal current sign detection system, the measurement result data of the ungrounded current for detecting the presence or absence of the ground fault in the facility 900 in which the cubicle 200 is arranged can be stably transmitted to the edge PC 300. Therefore, it is possible to constantly monitor the presence or absence of a sign that a ground fault will occur in the facility 900, and it is possible to support the accurate maintenance of the cubicle 200. Further, according to the abnormal current sign detection system 5, it is possible to prevent a ripple accident due to any one of a ground fault and a short circuit of the high voltage power receiving equipment 8.

Although the embodiments have been described with reference to the accompanying drawings, the present disclosure is not limited to the examples. It is obvious to those skilled in the art that various modifications, modifications, substitutions, additions, deletions and equivalents can be conceived within the scope of the claims. It is understood that it belongs to the technical scope of the present disclosure. Further, the constituent elements in the above-described embodiments may be arbitrarily combined without departing from the spirit of the invention.

For example, in the above-described first and second embodiments, the system configuration capable of detecting the signs of both the ground fault and the short circuit, but the system configuration capable of detecting the sign of only one of the ground fault and the short circuit. Good.

The present disclosure stably transmits data of a current measurement value for detecting the presence or absence of an abnormal current in a facility where high-voltage power receiving equipment such as a cubicle is arranged, and causes a ground fault or a short circuit in the facility. It is useful as an abnormal current sign detection system and an abnormal current sign detection method that constantly monitors the presence or absence of a sign that an abnormal current will occur and supports accurate maintenance of high-voltage power receiving equipment such as a cubicle.

5 Abnormal current sign detection system 200 Cubicle 210 Branch switch 230 Ground fault current measuring device 231 Zero-phase current transformer 240 Ground fault relay 240m, 252m Transmission cable 250 Short circuit current measuring device 251 Meter current transformer 252 Overcurrent relay 255 Ground PLC adapter 265 for fault detection PLC adapter 300 for short circuit edge PC
400 Learning Detection Server 500 Management Company Server

Claims (16)

A current measuring device that measures a current value for detecting a sign of abnormal current in a facility where high-voltage power receiving equipment is placed,
A power line communication adapter for acquiring measurement result data of the current value measured by the current measuring device,
An abnormal current detection device that is connected to the power line communication adapter so that power line communication is possible, and that receives measurement result data of the current value transmitted from the power line communication adapter,
The abnormal current detection device, based on the measurement result data of the current value for a predetermined period, to determine the presence or absence of a sign that the abnormal current occurs in the facility,
Abnormal current sign detection system. The measurement result data of the current value from the current measuring device is input to the power line communication adapter via a transmission cable,
The abnormal current sign detection system according to claim 1. The abnormal current detection device, when determining a sign that the abnormal current occurs, notifies an alert to at least one external device communicably connected with the abnormal current detection device,
The abnormal current sign detection system according to claim 1. The current measuring device includes a first current measuring device that measures a first current value for detecting a sign of a ground fault in a facility where the high-voltage power receiving equipment is arranged,
The power line communication adapter includes a first power line communication adapter that acquires measurement result data of the first current value measured by the first current measuring device,
The abnormal current detection device is connected to the first power line communication adapter so that power line communication is possible, receives the measurement result data of the first current value transmitted from the first power line communication adapter, and transmits for a predetermined period. Based on the measurement result data of the first current value for minutes, it is determined whether there is a sign that the ground fault will occur in the facility,
The abnormal current sign detection system according to any one of claims 1 to 3. The first power line communication adapter is arranged in the high-voltage power receiving equipment,
The abnormal current sign detection system according to claim 4. The first power line communication adapter operates based on electric power supplied from a secondary side of a transformer arranged in a cubicle included in the high-voltage power receiving equipment,
The abnormal current sign detection system according to claim 5. The abnormal current detection device uses a measurement result data of the first current value for a predetermined period to learn a first sign detection model for determining the presence or absence of a sign that the ground fault occurs,
The abnormal current sign detection system according to any one of claims 4 to 6. The current measuring device includes a second current measuring device that measures a second current value for detecting a sign of a short circuit of an electric path between a plurality of devices arranged in the high-voltage power receiving equipment,
The power line communication adapter includes a second power line communication adapter that acquires measurement result data of the second current value measured by the second current measuring device,
The abnormal current detection device is connected to the second power line communication adapter so as to be able to perform power line communication, receives the measurement result data of the second current value transmitted from the second power line communication adapter, and receives the measurement result data for a predetermined period. Based on the measurement result data of the second current value for minutes, the presence or absence of a sign that the short circuit will occur is determined.
The abnormal current sign detection system according to any one of claims 1 to 7. The measurement result data of the second current value from the second current measuring device is input to the second power line communication adapter via a transmission cable.
The abnormal current sign detection system according to claim 8. The abnormal current detection device, when determining a sign that the short circuit will occur, notifies the at least one external device communicably connected to the abnormal current detection device an alert,
The abnormal current sign detection system according to claim 8. The second power line communication adapter is arranged in the high-voltage power receiving equipment,
The abnormal current sign detection system according to any one of claims 8 to 10. The second power line communication adapter operates based on electric power supplied from a secondary side of a transformer arranged in a cubicle included in the high voltage power receiving equipment,
The abnormal current sign detection system according to claim 11. The abnormal current detection device learns a second sign detection model for determining the presence or absence of a sign that the short circuit will occur, using the measurement result data of the second current value for a predetermined period.
The abnormal current sign detection system according to any one of claims 9 to 12. The abnormal current detection device is a server connected via a network to at least an information processing device that performs power line communication with the power line communication adapter,
The abnormal current sign detection system according to any one of claims 9 to 13. The abnormal current detection device is an information processing device that performs power line communication with at least the power line communication adapter,
The abnormal current sign detection system according to any one of claims 1 to 12. Measuring a current value for detecting a sign of an abnormal current in a facility where high-voltage power receiving equipment is arranged by a current measuring device,
Acquiring the measurement result data of the current value measured by the current measuring device by a power line communication adapter,
A step of receiving the measurement result data of the current value transmitted from the power line communication adapter by an abnormal current detection device connected to the power line communication adapter so that power line communication is possible,
By the abnormal current detection device, based on the measurement result data of the current value for a predetermined period, to determine the presence or absence of a sign that the abnormal current occurs in the facility,
Abnormal current sign detection method.

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