Current limiting zinc oxide FR based bus voltage retaining device

Abstract

The present invention relates to a bus voltage maintenance device based on current-limiting zinc oxide FR, including current-limiting zinc oxide FR, a second high-speed eddy current switch K1, a high-voltage fast-breaking fuse FU, a first high-speed eddy current switch K0, a discharge damper RL, and The first isolating knife switch G1, the second isolating knife switch G2, and the third isolating knife switch G3; the discharge damper RL is connected in series with the first high-speed eddy current switch K0 and then connected in parallel with the current-limiting zinc oxide FR, and the high-voltage quick-blow fuse FU is connected in parallel At both ends of the current-limiting zinc oxide FR, the incoming line of the current-limiting zinc oxide FR passes through the incoming line of the second high-speed eddy current switch K1 and the first isolation knife switch G1 in turn, and the outgoing line of the current-limiting zinc oxide FR The end passes through the second isolation switch G2 to connect to the outlet end of the device. The present invention has the advantages of simple structure, safety and reliability, fast action, etc., can quickly put into the current-limiting zinc oxide FR, cut off the isolated short-circuit fault in time, prevent the further expansion of the short-circuit fault range, and effectively ensure that the busbar does not lose power when the feeder branch short-circuit fault occurs. pressure.

Description

technical field [0001] The invention relates to the technical field of power system bus voltage maintenance, in particular to a bus voltage maintenance device based on current-limiting zinc oxide FR. Background technique [0002] With the development of the economy and the sharp increase in the electricity load of enterprises, there are more and more branches carried by the busbar in the power grid. The voltage of the bus 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 bus 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 bus voltage is very low, which interrupts the operation of some loads that have not experienced short-circuit faults, such as frequency converters, motors, relays, solenoid valves, etc. These loads that respond significan...

AI Technical Summary

Problems solved by technology

[0004] The busbar residual voltage holding devices currently used in the market control the input of the busbar protection reactor through a high-speed switch. During normal operation, the high-speed switch short-circuits the busbar protection reactor. The protective reactor is connected in series to the line, and it takes 18ms from the occurrence of the short-circuit fault to the opening of the high-speed switch. The short-circuit fault may expand to the bus side, which will cause a wider range of short-circuit in the power system

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