Electro-hydraulic servo operating mechanism of high-voltage circuit breaker

Abstract

The invention discloses an electro-hydraulic servo operating mechanism of a high-voltage circuit breaker. It includes an electro-hydraulic servo-hydraulic system and an intelligent control device consisting of two cartridge valves, a pilot-level servo valve, a hydraulic cylinder, a motor, a pump, an accumulator, and displacement and pressure sensors. The electro-hydraulic servo-hydraulic system is controlled by the intelligent control device and the servo valve controller to realize the opening and closing of the circuit breaker and the adjustment control of the displacement speed. The invention has the advantages of controllable contact position and speed of the circuit breaker, fast response speed of the operating mechanism, high control precision, good opening and closing load matching characteristics and small opening and closing impact, and can monitor the power grid in real time, circuit breakers and The state of the hydraulic system realizes the intelligent operation and control of the circuit breaker. The invention solves the difficult problem of uncontrollable position and speed in the action process of the hydraulic operating mechanism of the existing high-voltage circuit breaker, and is beneficial to improving the overall opening and closing capacity, electrical and mechanical life and reliability of the circuit breaker.

Description

technical field [0001] The invention relates to high-voltage power transmission and transformation high-voltage switchgear, in particular to an electro-hydraulic servo operating mechanism for a high-voltage circuit breaker. Background technique [0002] The high-voltage circuit breaker is one of the key equipment for high-voltage power transmission and transformation. It plays a role in control and protection in the power grid. The hydraulic operating mechanism is a key component of the high-voltage circuit breaker. The working performance and quality of the operating mechanism play an extremely important role in the working performance and reliability of the high-voltage circuit breaker. At present, the traditional circuit breaker hydraulic operating mechanism is designed according to the single no-load opening characteristic, that is, no matter what the working state is, the no-load opening characteristic is the same, but in actual operation, the probability of serious fai...

AI Technical Summary

Problems solved by technology

The current hydraulic operating mechanism of the circuit breaker can only realize the operation requirements of the circuit breaker, but cannot realize the adjustment and control of the operating process, and cannot achieve good load matching performance

Although the circuit breaker can use the electric mechanism to realize the adjustment and control of the opening and closing process of the circuit breaker, it cannot be applied to high-level voltage due to the limitation of the size and capacity of the motor. With the development of the circuit breaker towards high voltage, large capacity and high reliability With the development and improvement of the intelligent arc extinguishing degree of the circuit breaker arc extinguishing chamber itself, the traditional operating mechanism cannot meet the demand for higher quality products of the power system. Therefore, it is necessary to study a new type of hydraulic operating mechanism and control system. Improve the opening and closing characteristics of high-voltage circuit breakers and the intelligent control and monitoring level of operation

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