CN201226019Y - Current temperature on-line fault indicator - Google Patents

Abstract

The utility model discloses a current temperature online fault indicator, which comprises a host, three phase line current temperature sensors and a grounding sensor, and is characterized in that: a display screen, an alarm indicator light and an operation button are arranged on the front panel of the host , there is a circuit board inside the host, which includes monitor circuit, display circuit and single chip microcomputer; the rear panel of the host is equipped with an optical fiber interface and wiring terminals, the optical fiber interface is connected to the phase line sensor through the optical fiber, and the grounding terminal is connected to the grounding sensor ; The phase line sensor is a current and temperature sensor, including a sensing block, a fixed frame connected to the sensing block, and an optical fiber interface at the bottom of the sensing block. The three phase line sensors are respectively arranged on the three core wires of the three-phase cable. superior. The utility model can monitor the current and temperature of the cable in real time, and indicate and transmit fault signals.

Description

Current temperature online fault indicator

technical field

The utility model belongs to the field of electric power failure indicators, and is a monitoring device specially designed for the automatic monitoring of power grid power supply systems.

Background technique

In the past, the traditional short-circuit and grounding only had on-site detection and indication of short-circuit fault and ground fault, which could not display the normal working current and temperature of the cable, let alone display and query the current and temperature at the time of the fault. It brings great inconvenience to the power supply department for the maintenance and repair of the line, and the rapid analysis and solution of the fault. With the deepening of power reform, power automation management has been promoted to a new agenda. Traditional technology and management methods have been unable to meet new requirements. People are in urgent need of a new device, which can be used in automatic management, can monitor the power grid line conditions at any time, detect and quickly eliminate faults in time.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a current and temperature online fault indicator capable of real-time monitoring of current and temperature, and indicating and transmitting fault signals.

The technical scheme adopted by the utility model is as follows: the current temperature online fault indicator includes a main engine, three phase line current temperature sensors and a grounding sensor. The front panel of the main engine is provided with a display screen, an alarm signal lamp and an operation button. A circuit board is provided, and the circuit board includes a monitor circuit, a display circuit and a single-chip microcomputer; the rear panel of the host is provided with an optical fiber interface and a connection terminal, the optical fiber interface is connected to the phase line sensor through the optical fiber, and the grounding terminal is connected to the grounding sensor;

The phase line sensor is a current and temperature sensor, including a sensing block, a fixed frame connected to the sensing block, and an optical fiber interface at the bottom of the sensing block. The three phase line sensors are respectively set on the three core lines of the three-phase cable. .

The host circuit board can also be provided with a remote control interface circuit and a 485 communication interface circuit, and the host rear panel is provided with a 485 communication interface.

The rear panel of the host computer can also be provided with wiring holes for remote flashing lights, remote reset and remote contacts.

There is a reset/test key on the front panel of the host.

Working principle and design:

Current temperature online fault indicator, three current and temperature sensors and one grounding current sensor are respectively installed on the three-phase cable. and have a host

The phase line current and temperature sensor senses the cable current and temperature, processes the sensed signal with a single-chip microcomputer, packs and codes the data, and transmits the signal to the host through optical fiber. The grounding current sensor senses the grounding current, processes the sensing signal through a single-chip microcomputer, packs and codes the data, and transmits the signal to the monitoring host through a three-core cable. The host receives the signal, amplifies the signal and sends it to the single-chip microcomputer, the data is unpacked and decoded by the single-chip microcomputer, and the current and temperature are displayed on the display screen.

The host can display and query the current and temperature of the cable in real time. When the short-circuit current of a certain phase or several phases flowing through the cable line reaches the short-circuit alarm setting current value, or when the cable temperature reaches the over-temperature alarm setting temperature, the sensor sends a signal to monitor the host. Alarm, and can indicate the difference between short circuit or overheating temperature, and save the current and temperature at the time of alarm in the alarm record. The indicator also has a 485 communication interface and a remote port, which can transmit the real-time current and temperature, alarm signal and alarm current and temperature through the 485 interface and the remote port.

The host has powerful functions, and can set the short-circuit current threshold, temperature threshold, or grounding alarm current threshold of each phase at any time on site, and the setting range is wide; after an alarm is generated, the alarm time, current and temperature information at the time of alarm are saved in the alarm In the record, it is convenient for on-site inquiry at any time; the display is also equipped with a background light, which can be seen even when there is no light source; it also has a battery power display, which is convenient for timely battery replacement. More importantly, the host is also equipped with a standard 485 communication interface, which can be easily connected with other PCs and single-chip devices, providing a broad platform for realizing power automation management.

The beneficial effect of the utility model is that the host computer can display and query the current and temperature of the cable in real time. When the short-circuit current of a certain phase or several phases flowing through the cable line reaches the short-circuit alarm setting current value, or when the cable temperature reaches the over-temperature alarm setting temperature, the sensor sends out a signal, monitors the host to alarm, and can indicate the phase difference of short circuit or overheating , and save the current and temperature at the time of the alarm in the alarm record. The indicator also has a 485 communication interface and a remote port, which can transmit real-time current and temperature, alarm signal, and current and temperature at the time of alarm through the 485 interface and remote port.

Below in conjunction with accompanying drawing, the utility model is further described.

Description of drawings

Fig. 1 is the structural diagram of the front panel of the host of the present invention;

Fig. 2 is the structural diagram of the host rear panel of the present invention;

Figure 3 is a structural diagram of the phase line sensor.

Detailed ways

Referring to Fig. 1, a display screen 11, a warning light 12, a function key button 13 and a reset/test key 14 are arranged on the front panel of the host computer 1. The current temperature is displayed, and the signal of the ground current sensor is transmitted to the host through the cable and the current is displayed through the display screen 11.

The host has a function menu, which can simultaneously display the phase current, temperature, and ground current values, and can also display alarm records, and has clock display functions and battery power display functions. There are four buttons 13, which can be used to set the current temperature alarm threshold and the grounding alarm threshold alarm duration, and various function settings can also control and query the information on the display screen 11. There are four warning lamps 12. When the short-circuit current or temperature of a certain phase reaches the current value or overtemperature warning value set by the alarm, or the ground current reaches the current value set by the alarm, the corresponding warning lights will flash and give an alarm.

On the rear panel of the host computer 1 are provided with an optical fiber interface 15 , a 485 communication interface 16 and a row of connection terminals 17 . There are three jacks in the optical fiber interface 15, which are respectively connected to three phase line sensors through optical fibers. The 485 communication interface 16 can connect the instrument to the 485 communication network, and can transmit real-time current and temperature, alarm signal and alarm current and temperature through the 485 interface. In the wiring hole 17, the wiring terminals labeled 1, 2, and 3 are ground sensor cable interfaces, the wiring terminals labeled 4, 5, and 6 are remote flashing lights and remote reset interfaces, and the wiring terminals labeled 7, 8, and 9 are The terminal block is the remote control interface.

The phase line sensor 2 is a current and temperature sensor, and its structure includes a sensing block 21 , a fixing frame 22 and an optical fiber interface 23 , and the phase line sensor 2 is fixed on the cable through the fixing frame 22 .

Claims (4)

1, the online fault detector of current temperature, comprise a main frame, three phase line sensors and a grounding sensor, it is characterized in that: the main frame front panel is provided with display screen, phase line temperature signal lamp and action button, be provided with circuit board in the main frame, comprise monitor circuit, display screen circuit and single-chip microcomputer on the circuit board; The main frame rear panel is provided with optical fiber interface and wiring hole, and with line sensor is continuous mutually, wiring hole links to each other with grounding sensor optical fiber interface by optical fiber;

The phase line sensor is electric current and temperature sensor, the optical fiber interface that comprises the sensing piece, is connected the fixed mount on the sensing piece and is located at sensing piece bottom, and three phase line sensors are located at respectively on three heart yearns of threephase cable.

2, the online fault detector of current temperature as claimed in claim 1 is characterized in that: also be provided with RCI circuit and 485 communication interface circuit on the host circuit board, be provided with 485 communication interfaces on the main frame rear panel.

3, the online fault detector of current temperature as claimed in claim 2 is characterized in that: the wiring hole that also is provided with control long-range flashing lamp, remote reset and long-range contact on the main frame rear panel.

4, as claim 1 or the online fault detector of 2 or 3 described current temperatures, it is characterized in that: on the main frame front panel, be provided with and reset/feeler switch.

Images