CN204495470U - A kind of optical fiber infrared trip free device of primary cut-out hot stall - Google Patents

Abstract

The utility model relates to an optical fiber infrared automatic tripping device for thermal failure of a high-voltage circuit breaker. Control cables, control modules and tripping devices. The temperature measuring probe of the infrared temperature measuring sensor conducts non-contact online continuous temperature measurement of the contacts of the high-voltage circuit breaker in operation by emitting and receiving infrared rays. The temperature measuring sensor transmits the temperature signal to the AD signal converter through the optical fiber, and the AD signal The converter converts the temperature electrical signal sent by the temperature sensor into a digital signal, and then transmits it to the control module. The control module analyzes and judges the transmitted temperature data according to the preset action temperature value. When the temperature value exceeds the set value , the control module sends an action command to the tripping device, and the tripping device controls the tripping coil of the circuit breaker's secondary circuit to trip the circuit breaker under load.

Description

An optical fiber infrared automatic tripping device for thermal failure of high voltage circuit breaker

technical field

The invention relates to an automatic on-load tripping device for thermal faults of high-voltage circuit breakers, in particular to an optical fiber infrared automatic tripping device for thermal faults of high-voltage circuit breakers.

Background technique

During the operation of the high-voltage circuit breaker, due to the electromagnetic effect, it will generate heat. When the contacts are not in good contact, or the circuit breaker is overloaded or other faults, the contacts of the high-voltage circuit breaker will be abnormally heated. When the temperature exceeds a certain range, if you do not take The measure of opening the circuit breaker device to cut off the power supply will cause the circuit breaker to burn out due to overheating, and even cause the danger of expanding the power grid accident. The traditional method of detecting poor contact of the traditional high-voltage circuit breaker that is widely used now is to conduct a DC resistance test by the tester during a power outage; If an abnormal temperature rise is found, other relevant operating personnel will be notified to take measures to disconnect the corresponding circuit breaker for power outage maintenance. The traditional high-voltage circuit breaker's poor contact and heat generation or overload heat generation cannot realize real-time continuous online detection and automatic tripping, and is affected by human factors of the operator, especially for sudden overheating failures of high-voltage circuit breakers, which may lead to high-voltage circuit breakers The device is damaged due to overheating, or even a serious accident that endangers the safety of the power grid.

Contents of the invention

The purpose of this utility model is to provide an automatic on-load tripping device for thermal failure of a high-voltage circuit breaker. The device can perform infrared on-line non-contact temperature measurement with only the contact of the high-voltage circuit breaker.

The utility model adopts the following technical solutions to realize: an optical fiber infrared automatic tripping device for thermal failure of a high-voltage circuit breaker, which includes a high-voltage circuit breaker, and is characterized in that it also includes an infrared temperature measuring sensor, an optical fiber, a first optical fiber transceiver, and a second optical fiber Transceiver, AD signal converter, control cable, control module and tripping device; the infrared temperature sensor is embedded on the outer wall of the arc extinguishing chamber of the high voltage circuit breaker; the output of the infrared temperature sensor is connected to the first optical fiber for transceiver The output of the first optical fiber transceiver is connected to one end of the optical fiber; the other end of the optical fiber is connected to the input of the second optical fiber transceiver; the output of the second optical fiber transceiver is connected to the input of the AD converter; the output of the AD converter is connected to the control The input of the module; the output of the control module is connected to the input of the tripping device through the control cable; the infrared temperature measuring sensor also includes an infrared temperature measuring probe, and the infrared temperature measuring probe is installed in the arc extinguishing chamber of the high voltage circuit breaker, and the The infrared temperature measuring probe is directly facing the closing contact of the high voltage circuit breaker, and the outer surface of the infrared temperature measuring probe is covered with an insulating sleeve.

In an embodiment of the present invention, the tripping device includes a tripping coil on the secondary circuit of the high voltage circuit breaker and dynamic and static contacts of the high voltage circuit breaker; the tripping device operates according to the instructions of the control module The tripping coil acts to separate the dynamic and static contacts.

In an embodiment of the utility model, the distance between the infrared temperature measuring probe and the closing contact of the high voltage circuit breaker is greater than the high voltage safety distance.

In an embodiment of the utility model, the high voltage circuit breaker is an oil circuit breaker, a sulfur hexafluoride circuit breaker, a vacuum circuit breaker or a compressed air circuit breaker.

In an embodiment of the utility model, the control module is a PLC microcomputer processor.

Compared with the traditional way that the staff carry infrared temperature measuring equipment to measure the temperature of each high-voltage circuit breaker in operation, and when a circuit breaker with an overheating fault is found, the operator is notified to open the corresponding circuit breaker. Infrared online non-contact temperature measurement can automatically control the circuit breaker with load tripping and cut off the power supply if the circuit breaker exceeds the safe temperature, which can effectively guarantee the safe operation of the high-voltage circuit breaker and the power grid in operation.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a block diagram of the working principle of the tripping device in an embodiment of the present invention.

Fig. 3 is a block diagram of the working principle of cluster control in an embodiment of the present invention.

[Description of labels]: 1-infrared temperature sensor with infrared temperature probe; 2-infrared probe; 3-infrared ray; 4-first optical fiber transceiver; 5-optical fiber; 6-second optical fiber transceiver; 7 -AD converter; 8-control module; 9-control cable; 10-insulation sleeve of infrared probe; 11-static contact; 12-moving contact; 13-tripping device.

Detailed ways

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

The utility model provides an automatic on-load tripping device for thermal failure of a high-voltage circuit breaker, and the specific structural diagram is shown in FIG. 1 . The device includes a high-voltage circuit breaker, and also includes an infrared temperature sensor 1, an optical fiber 5, a first optical fiber transceiver 4, a second optical fiber transceiver 6, an AD signal converter 7, a control module 8, a control cable 9 and a tripping device 13; The infrared temperature measurement sensor 1 is embedded on the outer wall of the arc extinguishing chamber of the high voltage circuit breaker; the output of the infrared temperature measurement sensor 1 is connected to the input of the first optical fiber transceiver 4; the output of the first optical fiber transceiver 4 Connect one end of the optical fiber 5; the other end of the optical fiber 5 is connected to the input of the second optical fiber transceiver 6; the output of the second optical fiber transceiver 6 is connected to the input of the AD converter 7; the output of the AD converter 7 is connected to the input of the control module 8; The output of the control module 8 is connected to the input of the tripping device 13 through the control cable 9; the infrared temperature measuring sensor 1 also includes an infrared temperature measuring probe 2, and the infrared temperature measuring probe 2 is installed in the arc extinguishing chamber of the high voltage circuit breaker, The infrared temperature measuring probe 2 is facing the closing contact of the high voltage circuit breaker, and the infrared temperature measuring probe is covered with an insulating sheath 10 . The infrared temperature measuring probe 2 can measure the temperature of the closing contact of the high voltage circuit breaker by emitting infrared rays.

In an embodiment of the present invention, the control module is a PLC microcomputer processor.

Further, the tripping device includes a tripping coil on the secondary circuit of the high-voltage circuit breaker, a moving contact 11 and a static contact 12 of the high-voltage circuit breaker; the tripping device makes the tripping coil Action to separate the dynamic and static contacts. See Figure 2 for the working principle block diagram of the tripping device.

It should be noted that the distance between the infrared temperature measuring probe and the closing contact of the high voltage circuit breaker should be greater than the high voltage safety distance.

The device is suitable for various high-voltage circuit breakers such as oil circuit breakers, sulfur hexafluoride circuit breakers, vacuum circuit breakers, and compressed air circuit breakers.

Preferably, the first optical fiber transceiver and the second optical fiber transceiver adopt HTB-3100AB-25KM single-mode optical fiber transceiver, and the AD signal converter adopts ADC0809.

In a specific embodiment, the utility model can use a plurality of infrared temperature measuring sensors to measure the temperature of a plurality of high-voltage circuit breakers, and realize cluster detection of all high-voltage circuit breakers in the whole substation. See Figure 3 for a block diagram of its working principle.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (5)

1. the optical fiber infrared trip free device of a primary cut-out hot stall, comprise primary cut-out, it is characterized in that: also comprise infrared temperature-test sensor, optical fiber, the first fiber optical transceiver, the second fiber optical transceiver, AD signal converter, control cables, control module and tripgear;

Described infrared temperature-test sensor is embedded on the outer wall of described high-voltage breaker explosion chamber; Described infrared temperature-test sensor exports the input connecing the first fiber optical transceiver; The output of the first fiber optical transceiver connects one end of optical fiber; The input of another termination second fiber optical transceiver of optical fiber; The output of the second fiber optical transceiver connects the input of AD converter; The output of AD converter connects the input of control module; The output of control module connects the input of tripgear by control cables;

Described infrared temperature-test sensor also comprises an infrared temperature probe, described infrared temperature probe is installed in described high-voltage breaker explosion chamber, described infrared temperature probe is just to the combined floodgate contact of described primary cut-out, and described infrared temperature probe outside is surrounded by insulation sleeve.

2. the optical fiber infrared trip free device of primary cut-out hot stall according to claim 1, is characterized in that: described tripgear comprises the dynamic and static contact of breaking coil on described primary cut-out secondary circuit and described primary cut-out; Described tripgear makes breaking coil action according to the instruction of described control module, and dynamic and static contact is separated.

3. the optical fiber infrared trip free device of primary cut-out hot stall according to claim 1, is characterized in that: the distance of the combined floodgate contact of described infrared temperature probe and primary cut-out is greater than high-voltage safety distance.

4. the optical fiber infrared trip free device of primary cut-out hot stall according to claim 1, is characterized in that: described primary cut-out is oil-break, sulfur hexafluoride breaker, vacuum circuit breaker or compressed-air circuit breaker.

5. the optical fiber infrared trip free device of primary cut-out hot stall according to claim 1, is characterized in that: described control module is a PLC computer processor.