Circuit breaker with current limiting reactor LR switching function

By designing the current limit reactor turn-off function in the circuit breaker, and using the coordination of mechanical switches and coupling inductors to input the current limit reactor only in the fault state, the problem of rapid increase in the fault current in the DC system is solved, efficient energy transmission and current limiting effects are achieved, and the power demand of the current limit reactor is reduced.

CN120433147AActive Publication Date: 2025-08-05GUANGDONG POWER GRID CO LTD
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Patent Information

Application Number
CN202510333429.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2025-08-05
Estimated Expiration
2045-03-20

AI Technical Summary

Technical Problem

The fault current in the DC system increases rapidly. The current limit reactor increases losses during the rated operation of the existing circuit breaker, and the power requirements for the current limit reactor are high, making it difficult to effectively limit the fault current rise rate.

Method used

A circuit breaker with the LR turn-off function of the current limiting reactor is designed. Through the coordination of mechanical switches, coupling inductors and thyristors, the current limiting reactor is only input in the fault state, and the coupled inductor induced voltage is used to transfer the current to the current limiting reactor to achieve the current limiting effect.

Benefits of technology

Reduce system losses during rated operation, improve energy transmission efficiency, limit the rate of fault current rise in the fault state, reduce the harm to the system, and reduce the power demand of the current limit reactor.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention provides a circuit breaker with a current-limiting reactor LR switching function. The circuit breaker comprises a mechanical switch K1, a first thyristor D1, a current-limiting reactor LR, a coupling inductor LO and a power supply VDD, the positive electrode of the mechanical switch K1 is respectively connected with the current limiting reactor LR, the first thyristor D1 and the power supply VDD; the negative electrode of the mechanical switch K1 is respectively connected with the current limiting reactor LR, the first thyristor D1 and the vacuum switch K2 through the primary side of the coupling inductor LO; the negative electrode of the vacuum switch K2 is connected with the negative electrode of the power supply VDD through the load R. When the circuit breaker is in rated operation, current only passes through the mechanical switch and the vacuum switch, so that the system loss is reduced, and the energy transmission efficiency of the circuit breaker is improved; in a fault state, the current limiting reactor is put into use, so that the effect of limiting the rising rate of the fault current of the system can be achieved, and favorable guarantee is provided for fault removal of the circuit breaker; and the speed of transferring the fault transient current from the mechanical switch to the current limiting reactor is improved.
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