A hydraulic operating mechanism and a switch using the same

Abstract

Provided are a hydraulic operating mechanism and a switch using the hydraulic operating mechanism to achieve adjustment and control of a "close-open" time of a circuit breaker. The hydraulic operating mechanism comprises a working cylinder (7) having a working cylinder piston rod (8), and a main valve (13) for controlling movement of the working cylinder piston rod (8), and a closing valve connected to the main valve (13) by controlling an oil passage. The closing valve is controlled by a closing electromagnet (17). The hydraulic operating mechanism further comprises an auxiliary switch (3) for controlling the opening and closing of a circuit where the closing electromagnet (17) is located. The hydraulic operating mechanism further comprises a signal cylinder (4) that triggers the auxiliary switch (3) during a reciprocating movement of the piston rod. Two chambers of the signal cylinder (4) are respectively in communication with the two chambers of the working cylinder (7). During operation, the piston rod of the signal cylinder (4) can move only when the working cylinder (7) drives the switch to close in position, and the auxiliary switch (3) is triggered to control the power loss of the closing electromagnet (17). The occurrence of the opening of the circuit breaker after the circuit breaker is not closed in position can be avoided, and the control to the "close-open" time of the circuit breaker is realized.

Description

technical field [0001] The invention relates to a hydraulic operating mechanism and a switch using the operating mechanism. Background technique [0002] The hydraulic operating mechanism is widely used in ultra-high voltage and ultra-high voltage circuit breakers, and is used to operate the circuit breaker for opening and closing actions. The hydraulic operating mechanism is characterized by constant charging and high pressure maintenance, instantaneous action, large operating power, high opening speed, rapid and stable action, and has irreplaceable advantages of other operating mechanisms. The hydraulic operating mechanism can be divided into nitrogen energy storage hydraulic mechanism and disc spring energy storage hydraulic mechanism according to the energy storage method. Because the disc spring energy storage hydraulic mechanism stores energy by compressing the disc reed, the working pressure is high, and the reliability of the domestic disc reed is high. Its stabilit...

AI Technical Summary

Problems solved by technology

[0006] However, when there is a pre-voltage fault on the transmission line, the circuit breaker must be opened immediately after closing to quickly cut off the faulty line. At this time, if the circuit breaker is opened before it is fully closed, the breaking performance of the circuit breaker cannot be guaranteed. , the operating mechanism must be able to ensure that the circuit breaker can be opened after closing in place, that is, to ensure the "closing and opening" time of the circuit breaker

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