Online protection circuit of high-voltage breaker opening/closing coil and protection method thereof

Abstract

The invention discloses an online protection circuit of a high-voltage breaker opening / closing coil, and further discloses a protection method of the protection circuit. At the moment of action of the opening / closing coil, action currents are used for judging completeness of a loop, namely after opening or closing, monitoring currents flowing through a sub circuit with an added resistor R1 and an added resistor R2 are used for judging the completeness of the loop. Statistics is carried out and a health spectrum is formed, changing conditions of voltage, currents, resistance and the temperature of the opening / closing coil are tracked in real time, and meanwhile state information of a high-voltage breaker and temperature zoom of the opening / closing coil are introduced in to prevent mistaken reports and mistaken actions. Conditions of the transformer substation operating loop can be detected in an online real-time mode at a control center, an evaluation result can be detected in real time to provide a direct guidance for maintenance of operation of the high-voltage breaker, reliability of power supply is improved, full-working-state monitoring and instant intelligent protection of a secondary loop of the high-voltage breaker is really achieved, and application of the detection device has no negative effect on an original high-voltage breaker operating loop of an electric power system.

Description

technical field [0001] The invention relates to an on-line protection circuit for the opening / closing coil of a high-voltage circuit breaker, and also relates to a protection method for the circuit. Background technique [0002] Opening / closing coil burning accidents often occur during the operation of the power system. The opening / closing coil is the final executive element of the power system control and protection circuit, and is also one of the important components in the electromagnetic operating mechanism of the high-voltage circuit breaker. It is very important for the safety of the power system. Reliable operation plays a pivotal role. [0003] The opening / closing coil is an instantaneous working element, and the opening / closing coil often burns out during operation. As we all know, the opening / closing coils are designed for short-time energization, and the currents of the opening / closing coils are also different due to the different operating mechanisms. The burni...

AI Technical Summary

Problems solved by technology

Through the analysis of the four monitoring methods, there is a common problem in the first three methods: after the circuit breaker is closed, the integrity of the closing circuit loses monitoring; after the circuit breaker trips, the integrity of the tripping circuit loses monitoring, all of which are non-complete Condition monitoring

The tripping circuit of the fourth mode belongs to full working condition monitoring, but the closing circuit still belongs to non-full working condition monitoring

[0007] Combined with the phenomenon of burnout of the opening / closing coil of the circuit breaker that occurs from time to time in the power system, as the majority of electric power customers have higher and higher requirements for power supply reliability, there is still no special protection for the full opening / closing coil of the circuit breaker so far. On-line detection and protection method of working conditions

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