Interlocking vacuum switch and series compensation type current limiting device and method based on same

Abstract

An interlocking vacuum switch and a series compensation type current limiting device and method based on the same are provided. The switch uses an interlocking vacuum interrupter. A fast repulsion mechanism is selected to cooperate with the interlocking vacuum interrupter to realize fast switching of the series compensation type current limiting device between the two functions of series compensation and current limiting. When the line of a traction network runs normally, a series compensation capacitor is accessed, and the device works in a series compensation state. When the line is short-circuited, an interlocking vacuum switch acts to short-circuit the capacitor, and a current limiting reactor is put into use in the system to limit the short circuit current of the line. Inside the sameinterrupter, a main static contact and a main moving contact constitute a first contact group to switch on/off the current limiting reactor, and an auxiliary static contact and an auxiliary moving contact constitute a second contact group to switch on/off the compensation capacitor. A single vacuum interrupter and a set of operating mechanism are adopted to realize the switching of a traction system between the functions of series compensation and current limiting. The volume cost and economic cost of the device can be reduced, and the reliability of the system can be improved.

Description

technical field [0001] The interlocking vacuum switch in the present invention belongs to the field of high-voltage vacuum switches, and specifically relates to an interlocking vacuum switch that uses a single vacuum switch to realize two different functions at the same time; System) comprehensive field of series compensation and current limiting technology, in particular to a series compensation type current limiting device and method based on an interlocked vacuum switch. Background technique [0002] The power supply of the electrified railway is to build several traction substations along the railway. The main task of the traction substation is to reduce the 110kV (or 220kV) three-phase alternating current from the power system to 27.5kV (or 2× 27.5kV) single-phase power, and then the single-phase power supply is sent to the catenary through the feeder line, and the catenary supplies power to the electric locomotive. However, on long slopes, heavy-duty lines and the end...

AI Technical Summary

Problems solved by technology

If the switching of the above-mentioned series compensation and short-circuit fault current limiting functions is to be realized at the same time, two vacuum switches and two sets of independent operating mechanisms are required. In this case, the material, cost and volume are greatly increased, and the switch control system complexity, reducing the reliability of line protection

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