A current three-phase linkage switching device

Abstract

The invention discloses a current three-phase linked switching device, and relates to an improvement on a current switching device. The switching device can meet the current application situation in China, greatly reduce operating strength, improve operating safety and convenience and avoid misoperation, is used for connecting and switching bypass current between a No.1 main transformer and a No.2 main transformer, and comprises a rectangular insulating movable plate and a rectangular insulating fixed plate, wherein conducting bar groups A, B, C and N are uniformly distributed in the transverse direction of the fixed plate at equal intervals; three conducting bars are arranged in each conducting bar group; lapping bars A, B, C and N are arranged in the transverse direction of the movable plate; the initial positions of the four lapping bars in the transverse direction of the movable plate are respectively consistent with those of 0# conducting bars in the conducting bar groups on the fixed plate in the transverse direction of the fixed plate; and the width of the lapping bars is L3 which is less than L2+2*L1 and more than L1. By the switching device, short circuit, withdrawal, investment and short circuit removing operation which is performed stepwise originally is changed into one-step operation, so that misoperation accidents are avoided.

Description

Technical field [0001] The invention relates to a current switching device for a main transformer differential protection bypass switch in an electric power system, and in particular to an improvement of the current switching device. Background technique [0002] Many current loops in substations need to be switched during operation, such as the current loop switching of the main transformer switch and bypass switch of the main transformer differential protection, and the current loop switching of the bus differential protection; the bypass current is short-circuited and exited under normal circumstances. It can be switched to the "Generation No. 1 Main Transformer" or "Generation No. 2 Main Transformer" position, but it is strictly prohibited to open the circuit during the live switching process. These operations are carried out by the attendant, usually through the current switching pressure plate. These pressure plates are generally divided into four phases (ABCN), and the bi...

AI Technical Summary

Problems solved by technology

However, at present, the price of foreign protection devices is expensive, and the operating environment requirements are high.

It is directly applied to domestic application sites, and other equipment needs to be updated and modified, and the workload and cost are huge.

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