Novel busbar residual voltage holding device

Abstract

The present invention relates to a novel busbar residual voltage maintaining device, which includes a bus protection reactor L, an explosive bridge body FSR, a first high-speed eddy current switch K0, a current-limiting damper RL and a second high-speed eddy-current switch K1, the current-limiting damper RL is connected in series with the mother protection reactor L and then connected in parallel with the explosive bridge body FSR, the first high-speed eddy current switch K0 is connected in parallel at both ends of the explosive bridge body FSR, and the incoming line end of the explosive bridge body FSR passes through the second high-speed eddy current switch K1 is connected to the incoming line end of the device, and the outgoing line termination of the explosive bridge body FSR is connected to the outgoing line end of the device. The present invention has the advantages of simple structure, safety and reliability, fast action, saving transformer investment and operation loss, etc., and can put into the mother protection reactor within 2ms, which is far faster than the 15ms switching speed of the mother protection reactor controlled by the circuit breaker in the current market; It can remove and isolate the short-circuit fault in time, prevent the further expansion of the short-circuit fault range, and effectively ensure that the busbar does not lose voltage when the feeder branch short-circuit fault occurs.

Description

technical field [0001] The invention relates to the technical field of busbar residual voltage maintenance in electric power systems, in particular to a novel busbar residual voltage maintenance device. Background technique [0002] With the development of the economy, the number of power consumption enterprises has increased sharply, and the probability of short-circuit faults in each branch has also increased sharply. When a short circuit occurs in a branch under the bus, the voltage of the bus connected to the branch will drop sharply. The residual voltage of the busbar is generally lower than 20% of the rated voltage. Only when the branch circuit breaker is disconnected and the short circuit fault is removed, the busbar voltage can be restored. During the period when the bus voltage sags, the power supply system of the enterprise is called "shock power". During the occurrence of "shock electricity", the residual voltage of the busbar is very low, which interrupts the ...

AI Technical Summary

Problems solved by technology

[0004] At present, the busbar residual voltage maintenance devices on the market directly connect the bus protection reactor and the circuit breaker in parallel, and control the switching of the bus protection reactor through the opening and closing of the circuit breaker. Due to the inherent mechanical characteristics of the circuit breaker, it is limited The switching speed of the mother protection reactor when a fault occurs

In addition, since the surge current released by the mother protection reactor cannot be limited when it exits, it is very likely to cause damage to the mother protection reactor, adding a fault point

Images