CN108036817A - Distribution Running State integrated monitoring - Google Patents

Abstract

The invention relates to a method for comprehensive monitoring of distribution network operation status, which includes the following steps in turn: Step 1 obtains distribution network information in real time, Step 2 receives the information obtained in Step 1 and compares and judges it, and Step 3 formulates the site according to the information judged in Step 2 Inspection tasks or inspection and maintenance tasks; the advantages of the present invention: through the above method, not only the labor intensity of manual work is reduced, the work efficiency is improved, but also the power supply capacity is improved. Make full use of the existing state information for power grid operation, grasp the state of power distribution equipment to the greatest extent through multi-faceted and diversified analysis, find faults in time, and formulate reasonable maintenance strategies based on this, thereby improving the available time of power distribution equipment , prolong the service life of equipment, save a lot of maintenance costs, improve the lean management level of distribution network, reduce the workload of operation and maintenance personnel, improve operation and maintenance efficiency, improve the reliability of distribution network operation, and improve the quality of power supply service.

Description

Comprehensive monitoring method of distribution network operation status

technical field

The invention relates to a method for comprehensively monitoring the running state of a distribution network.

Background technique

As an important part of the power grid, the distribution network is directly oriented to end users and is closely related to the production and life of the masses. It is an important infrastructure to serve the people's livelihood. The operating status of the distribution network is closely related to the status of the distribution network equipment and the environment. In order to accurately judge and analyze the operating status of the distribution network, it is necessary to integrate information such as distribution system information, equipment information, and environmental information. However, the existing distribution network cannot quickly and reliably obtain the above-mentioned information. The level of power supply directly affects the power supply capacity and power supply quality. Once the power distribution network is cut off or the power supply is disturbed, it will not only endanger the public safety of the society and the personal safety of the people, but also cause major losses or influences in politics or economy. May be paralyzed.

Contents of the invention

The technical problem to be solved by the present invention is to provide a comprehensive monitoring method for the operation state of the distribution network, and solve the technical problem that the existing monitoring host cannot obtain the operation state information of the distribution network in real time, resulting in unsafe factors in the distribution network.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a comprehensive monitoring method for the operation status of the distribution network, which includes the following steps in turn:

Step 1: Obtain the line load information in the distribution network, cable fault information, transformer pile head and outgoing cable head temperature information, power distribution equipment information, and distribution network operating environment information in real time;

Step 2: Receive the information obtained in Step 1 and compare it with the historical information in the memory, and judge the information on the operating status of the distribution network;

Step 3: The distribution automation master station formulates on-site inspection tasks or maintenance tasks based on the information judged in step 2, and sends them to relevant personnel in the form of SMS.

Preferably, the power distribution equipment information in step 1 includes power distribution switch information, power distribution equipment power supply information and distribution automation secondary circuit information.

Preferably, the cable fault information in step 1 includes single-phase ground fault information, the temperature information of the transformer pile head and the outlet cable head in step 1 is detected by a temperature sensor, and the information about the operating environment of the distribution network in step 1 includes temperature Humidity information and SF6 gas concentration information, and the temperature and humidity information is collected by a temperature and humidity controller, and the SF6 gas concentration information is collected by an ultrasonic detector.

Preferably, in step 2, the ARM main processor is used to receive, compare and judge information.

Preferably, the ARM main processor and the distribution automation master station implement information transmission through Ethernet or UART.

To sum up, the advantages of the present invention are: real-time acquisition of line load information in the distribution network, cable fault information, transformer pile head and outgoing cable head temperature information, power distribution equipment information, and distribution network operating environment information , and compare the obtained information with the historical information in the memory to judge the information of the operation status of the distribution network, and then formulate on-site inspection tasks or maintenance tasks through the distribution automation master station, which not only reduces the labor intensity of manual operations , improve work efficiency, but also help to improve power supply capacity. Make full use of the existing state information for power grid operation, grasp the state of power distribution equipment to the greatest extent through multi-faceted and diversified analysis, find faults in time, and formulate reasonable maintenance strategies based on this, thereby improving the available time of power distribution equipment , prolong the service life of equipment, optimize the allocation and use of maintenance funds, save a lot of maintenance costs, improve the lean management level of distribution network, reduce the workload of operation and maintenance personnel, improve operation and maintenance efficiency, and improve the reliability of distribution network operation. Improve the quality of power supply services and enhance the company's social image.

Detailed ways

The method for comprehensive monitoring of distribution network operation status includes the following steps in sequence:

Step 1: Obtain the line load information in the distribution network, cable fault information, transformer pile head and outgoing cable head temperature information, power distribution equipment information, and distribution network operating environment information in real time;

Step 2: Receive the information obtained in Step 1 and compare it with the historical information in the memory, and judge the information on the operating status of the distribution network;

Step 3: The distribution automation master station formulates on-site inspection tasks or maintenance tasks based on the information judged in step 2, and sends them to relevant personnel in the form of SMS.

The power distribution equipment information in step 1 includes power distribution switch information, power distribution equipment power supply information and distribution automation secondary circuit information, and the reliability of switches and power distribution equipment power supplies can be analyzed in real time based on the obtained information, which is conducive to detection operations loop, to achieve remote maintenance of on-site terminal equipment without dead ends.

The cable fault information in step 1 includes single-phase grounding fault information. In the present invention, the asymmetric current source device preferably detects the characteristics of the asymmetric current signal generated on the fault line to realize fault line selection and fault point location. When the line When a single-phase ground fault occurs at any point above, after the asymmetric current source installed in the substation or on the line detects the fault information, it first judges the faulty phase, and then applies a specific signal to the faulty phase, and the fault detection device installed on the line detects If the specific signal flowing through the line meets the fault characteristics, the fault detection device will give an alarm to indicate the fault information. In addition, it can be installed on the key nodes of the main line of the overhead line of the distribution network and the single-phase ground fault of the overhead line on the important branch line. The monitoring device collects line current, electric field, and cable temperature in real time. When the line current and electric field signals change abnormally, it records the abnormally changing current and electric field signal waveforms. At the same time, it uses special short-distance wireless communication technology and GPRS invalid communication technology for data transmission. The online monitoring system software collects the wave recording data of each node of the overhead line of the entire distribution network, combines historical data, adopts data mining technology, identifies line faults, and performs inversion analysis on the occurrence process of line faults to obtain fault information. Step 1 The temperature information of the transformer pile head and outgoing cable head is detected by the temperature sensor. The temperature sensor can detect the temperature of the transformer pile head and the outgoing cable head in real time, and the temperature sensor is a wireless passive temperature sensor, which can realize the wireless transmission of temperature information. Steps The information on the operating environment of the distribution network in No. 1 includes temperature and humidity information and SF6 gas concentration information, and the temperature and humidity information is collected by the temperature and humidity controller, and the SF6 gas concentration information is collected by the ultrasonic detector, which can quickly obtain the distribution network operating environment information to ensure the safety performance of distribution network operation.

In step 2, the ARM main processor is used to receive, compare and judge information. The overall contracting of the ARM main processor is low and the execution efficiency is high. The ARM main processor and the distribution automation master station realize the transmission of information through Ethernet or UART. The information transmission is stable and the reliability is good.

In addition, the communication protocol standardization extension is set on the ARM main processor. In this embodiment, the method of extending the standardization protocol is given priority to realize SCADA functions, other fault detection, fault recording, remote maintenance and real-time monitoring of terminal equipment. SCADA functions include telemetry, remote signaling , remote control function, remote measurement includes voltage, current, active power and reactive power under normal load conditions, also includes zero sequence, negative sequence voltage and current, and can also be connected to DC input, mainly used to monitor the voltage of the battery used The remote signal is mainly connected to the auxiliary contact signal of the power distribution switch, the energy storage normal signal of the energy storage mechanism, the "soft pressure plate" controlled by the device, such as the local remote control pressure plate signal, and the remote control includes the power distribution switch closing and tripping output. , also includes switching output for functions such as battery activation control.

Other fault detection: short-circuit faults in power systems refer to short-circuits between phases and phases or between phases and ground that cause a sharp increase in current and a sharp drop in voltage, and further cause damage to electrical equipment, and short-circuits in effective neutral grounding systems Faults are divided into three-phase short circuit, two-phase short circuit, two-phase ground short circuit and single-phase ground short circuit. The short-circuit fault in the neutral point non-effectively grounded system is divided into three-phase short circuit, two-phase short circuit and two-phase ground short circuit. In the event of a type of fault, the fault feature is obvious and the fault current is large, and the overcurrent method can be used for detection. When the detected current exceeds the protection setting value, it is considered that a short circuit fault has occurred. The fault information collected by the terminal includes fault current, voltage value, and fault occurrence time. In order to facilitate fault analysis, the waveform of fault voltage and current can be recorded. In order to simplify the composition of the device and reduce the amount of data transmission, it is also possible to record only a few key fault current and voltage amplitudes, such as fault occurrence and fault removal. Values before and after the time.

Fault recording: When a fault is detected in the system, it is necessary to record the changes of various electrical quantities before and after the fault. Through the analysis and comparison of these electrical quantities, it is possible to analyze and deal with the accident and judge whether the protection is operating correctly. Improving the level of safe operation of the power system plays an important role;

Remote maintenance: The remote maintenance function of power distribution terminals mainly refers to modifying and adjusting the operation and control parameters of power distribution terminals in a remote place, so as to realize remote modification of parameters related to system operation such as protection settings and related maintenance of devices. In order to reduce the equipment maintenance workload of operating personnel.

Real-time monitoring of terminal equipment: The online monitoring function of terminal equipment includes real-time detection of the operating status of the main functional modules of the power distribution terminal, such as online monitoring of the status of key components of the power distribution terminal CPU, I/O interface, A/D conversion, and memory , the working status of the above modules requires new functional modeling to implement protocol extensions.

Except above-mentioned preferred embodiment, the present invention also has other embodiments, and those skilled in the art can make various changes and deformations according to the present invention, as long as they do not depart from the spirit of the present invention, all should belong to the scope defined in the appended claims of the present invention scope.

Claims (5)

1. distribution Running State integrated monitoring, it is characterised in that：Comprise the following steps successively：

Step 1：Obtain circuit information on load, cable fault information, transformer pile head and outlet cable in power distribution network in real time respectively Head temperature information, controller switching equipment information, the information of power distribution network running environment；

Step 2：The information of the acquisition of receiving step one is simultaneously compared with the historical information in memory, and judges that power distribution network is transported The information of row state；

Step 3：The information that power distribution automation main station judges according to step 2 formulates live patrol task or repair and maintenance task, And the form of short message is issued to related personnel on hand.

2. distribution Running State integrated monitoring according to claim 1, it is characterised in that:Distribution in step 1 Facility information includes panel switches information, controller switching equipment power information and power distribution automation secondary loop information.

3. distribution Running State integrated monitoring according to claim 1, it is characterised in that:Cable in step 1 Fault message includes singlephase earth fault information, and the transformer pile head and outlet cable head temperature information in step 1 pass through temperature Sensor is detected, and the information of the power distribution network running environment in step 1 includes humiture information and SF6 gas concentration information, And humiture information is gathered by temperature and humidity controller, SF6 gas concentration information is gathered by supersonic detector.

4. distribution Running State integrated monitoring according to claim 1, it is characterised in that:Pass through in step 2 Reception, comparison and judgement of the ARM primary processors into row information.

5. distribution Running State integrated monitoring according to claim 4, it is characterised in that:ARM primary processors with Power distribution automation main station realizes the transmission of information by Ethernet or UART.