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Tripping monitoring loop

A tripping circuit and tripping technology, which is applied in the field of relay protection, can solve the problems of potential safety hazards and the inability to monitor the whole process, and achieve the effect of improving reliability

Active Publication Date: 2020-08-25
JIEYANG POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a "blind zone" in the monitoring circuit in the prior art, which cannot play the role of whole-process monitoring, and there are major safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In view of this, the embodiment of the present invention proposes a trip monitoring circuit, which can monitor the whole process of the trip circuit when the power equipment is in normal operation, especially the connection of the pressure plate of the trip outlet, which is conducive to improving the reliability of the safe operation of the power grid. image 3 It is a schematic diagram of electrical connection of a trip monitoring circuit provided by Embodiment 1 of the present invention. refer to image 3 , The trip monitoring circuit provided by the embodiment of the present invention includes: the first normally open auxiliary contact BG1 of the circuit breaker, the trip coil TQ, the normally open contact TBJ1 of the trip self-holding relay, the trip self-holding relay coil TBJ, the closing monitoring relay HWJ, the interval Protection trip contact TJ, pressure plate LP and trip circuit monitoring relay TLJ;

[0039] After the normally open contact TBJ1 of the trippi...

Embodiment 2

[0046] On the basis of the foregoing embodiments, continue to refer to image 3 , the first end of the coil of the trip circuit monitoring relay TLJ provided by the embodiment of the present invention is electrically connected to the first end a of the tripping contact TJ of the interval protection, and the second end of the coil of the tripping circuit monitoring relay TLJ is connected to the tripping contact of the interval protection The second end b of TJ is electrically connected.

[0047] Specifically, the advantage of this setting is that the area between the two ends of the coil of the trip circuit monitoring relay TLJ connected to the trip circuit belongs to the monitoring blind zone, and the first end of the coil of the trip circuit monitoring relay TLJ is connected to the trip contact of the interval protection The first end a of TJ is electrically connected, and the second end of the coil of the tripping circuit monitoring relay TLJ is electrically connected with t...

Embodiment 3

[0051] Figure 5 It is a schematic diagram of electrical connection of a trip monitoring circuit provided by Embodiment 3 of the present invention. refer to Figure 5 , on the basis of the above embodiments, the alarm branch 100 also includes a second normally open auxiliary contact BG3 of the circuit breaker;

[0052] The first end of the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is electrically connected to the second power supply positive terminal 201, and the second end of the normally closed contact TLJ1 of the trip circuit monitoring relay TLJ is electrically connected to the second normally open auxiliary contact BG3 of the circuit breaker , the negative terminal of the second power supply is grounded (not shown).

[0053] Specifically, when the three-jump relays TJR, TJQ, and TJF and the staff manually trip the contact STJ of the circuit breaker in this interval, the coil of the trip circuit monitoring relay TLJ is short-circuited, so that...

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PUM

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Abstract

The embodiment of the invention discloses a tripping monitoring loop, which comprises a first normally open auxiliary contact of a circuit breaker, a tripping coil, a normally open contact of a tripping self-holding relay, a coil of the tripping self-holding relay, a closing monitoring relay, an interval protection tripping contact, a pressing plate and a tripping loop monitoring relay, wherein the first end of the interval protection tripping contact is electrically connected with the positive end of the first power supply, the second end of the interval protection tripping contact is electrically connected with the first end of the pressing plate, and the second end of the pressing plate is electrically connected with the second end of the coil of the tripping self-holding relay; a coilof the tripping loop monitoring relay is connected with the interval protection tripping contact in parallel, and thenormally-closed contact of the tripping loop monitoring relay is connected into thealarm branch in series. According to the technical scheme provided by the embodiment of the invention, the whole process of the tripping circuit can be monitored, especially the connection conditionof the pressing plate of the tripping outlet can be monitored, and the reliability of safe operation of a power grid is improved.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of relay protection, in particular to a trip monitoring circuit. Background technique [0002] In power system relay protection, the trip circuit is an important secondary circuit. The trip command of the protection device is transmitted to the trip coil through the trip circuit to realize the opening of the circuit breaker, so as to isolate the grid fault in time and ensure the safe operation of the grid. [0003] In the prior art, a monitoring circuit is usually used to monitor the operation process of the tripping circuit, so as to determine whether the tripping circuit is disconnected. However, there are "blind spots" in the monitoring circuit in the prior art, which cannot play the role of whole-process monitoring, and there are major safety hazards. Contents of the invention [0004] An embodiment of the present invention provides a trip monitoring circuit, so as to monitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/04H02J13/00G01R31/327G01R31/54G01R31/68
CPCH02H7/26H02H3/04H02J13/00002H02J13/0004G01R31/327G01R31/54G01R31/68
Inventor å€Šč‹—å‡
Owner JIEYANG POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD