High voltage circuit breaker control circuit

Abstract

The invention discloses a control circuit of a high-voltage circuit breaker. Connection positions of auxiliary contacts DL of the circuit breaker are adjusted so as to enable the auxiliary contacts DL of the circuit breaker to be distributed in front of all elements, other components and parts and contacts are in series connection and distributed behind, a switch-on abnormal relay HYCJ, a trip abnormal relay TYCL and a loop resistor R are added in a protection operation plug, normally closed contacts of the switch-on abnormal relay HYCJ and the trip abnormal relay TYCL are serially connected to form 'control circuit abnormal' signals, and the signals can be transmitted to a monitoring system from a comprehensive substation automation system channel. The control circuit of the high-voltage circuit breaker achieves full work condition monitoring, ensures production personnel to initiatively eliminate hazards, enables people to find out latent defects in advance and timely eliminate the hazard, avoids unnecessary power failure and guarantees safe and stable operation of a power grid.

Description

technical field [0001] The invention relates to a high-voltage circuit breaker, in particular to a high-voltage circuit breaker control circuit. Background technique [0002] As an important device for connecting and removing loads in a substation, a high-voltage circuit breaker's operating status plays a vital role in the operation of the substation. The schematic diagram of the conventional high-voltage circuit breaker control circuit is as follows: figure 1 As shown, its monitoring circuit is used to indicate the closing and tripping position status of the circuit breaker, and correctly reflect the correctness of the opening and closing circuit of the circuit breaker. During operation, the circuit breaker relies on the normally closed auxiliary nodes of the tripping relay TWJ and the closing relay HWJ in the operation box to monitor the opening and closing control circuit, such as figure 2 shown. When the control loop is interrupted and the status is abnormal, the TWJ...

AI Technical Summary

Problems solved by technology

But the normally open contact DL of the circuit breaker is open, the trip circuit is disconnected, and the internal circuit of the trip mechanism cannot be monitored

If there is a breakpoint in the internal circuit of the tripping mechanism of the circuit breaker, such as the tripping coil of the circuit breaker is blown, it is impossible to identify such equipment defects in advance at this time

When closing the circuit breaker to start power transmission, if there is a potential defect in the opening circuit of the circuit breaker, the signal of "control circuit disconnection" will be reported immediately, and the power must be cut off immediately, which will cause unnecessary power outages and delay the power transmission time

[0005] From the above analysis, it can be seen that the conventional circuit breaker control circuit only has a 50% monitoring range, and cannot perceive potential safety hazards in advance, and cannot realize 100% full working condition monitoring

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