Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker

Abstract

The invention discloses a device for limiting a peak value and the rate of rise of transient recovery voltage of a circuit breaker, which not only can limit the rate of rise of the transient recovery voltage of the circuit breaker, but also can limit the peak value of the transient recovery voltage of the circuit breaker. In the device of the invention, the two ends of the circuit breaker are connected in parallel with a capacitor and a lightning protector so as to limit the transient recovery voltage of the circuit breaker; the capacitor is connected in parallel so as to limit the rate of rise of the transient recovery voltage of the circuit breaker; and the lightning protector is connected in parallel to the two ends of the circuit breaker can limit the peak value of the transient recovery voltage of the circuit breaker.

Description

technical field [0001] The invention relates to the field of electric power system electronic devices, in particular to a device for limiting the rising rate and peak value of the transient recovery voltage of a circuit breaker. Background technique [0002] In 750kV and UHV power grids, circuit breakers are one of the most important and most difficult equipment to manufacture. How to improve the breaking capacity of circuit breakers is very important for the safe and reliable operation of 750kV and UHV systems. [0003] The transient recovery voltage of a circuit breaker is an important indicator of the breaking capacity of a circuit breaker. A large number of research and experimental analysis show that. The rising rate and peak value of the transient recovery voltage TRV are the most important factors affecting the opening of the circuit breaker. [0004] When a short-circuit fault occurs in the line, a short-circuit current will flow through the circuit breaker and ot...

AI Technical Summary

Problems solved by technology

[0007] The fracture of some AC high voltage circuit breakers is connected in parallel with capacitors with small capacitance. The main function is to improve the voltage distribution of the circuit breaker fracture. Although it can also play a role in limiting the recovery voltage rise rate of the circuit breaker, the limiting effect is very limited.

Under certain requirements, some circuit breakers are connected in parallel with thousands of pF capacitors to limit RRRV, but cannot limit the peak recovery voltage

[0008] In 750kV and UHV systems, under certain faults (such as outlet faults, short-distance faults), especially in the special operation mode at the initial stage of construction, there may be a high rate of rise in the transient recovery voltage of the circuit breaker; at the same time With the wide application of series compensation, new requirements are put forward for the breaking capacity of circuit breakers. Research shows that in systems equipped with series compensation, the peak transient recovery voltage of circuit breakers is relatively high, and in some cases exceeds the national standard requirements

Images