Electromagnetic hydraulic valve possessing self-defence capability

Abstract

The invention discloses an electromagnetic hydraulic valve with the self-defense capability, which comprises a main hydraulic valve, a separating-brake electromagnetic valve and a closing-brake electromagnetic valve. A self-defense delay valve is arranged between the separating-brake electromagnetic valve and the main hydraulic valve; a delay piston cylinder and a throttle valve-group cylinder are arranged side by side in the right cavity of the self-defense delay valve leftward; a delay piston is arranged in the delay piston cylinder; a spring, throttle plugs and a core tube are arranged in turn in the throttle valve-group cylinder from left to right, and the left of the throttle valve-group cylinder is communicated with the main-providing oil interface; an adjusting-position plug is arranged in the right cavity of the self-defense delay valve in order to adjust the motion scope of the delay piston; the blocked wire and nuts are arranged in the right of the adjusting-position plug in turn; and the left cavity of the self-defense delay valve is provided with a spring tube socket, which is provided with a reduction spring, the left of which is connected with a spring anti-thrust plug, which is connected with the delay piston. The invention has the advantages of strong self-defense capability, minor delay error between the separating and the closing, stable technical performance, simple structure, low failure rate and convenient maintenance.

Description

technical field [0001] The invention belongs to the field of operating mechanisms of high-voltage circuit breakers, in particular to a hydraulic solenoid valve with self-defense capability closing-opening delay control error and small. Background technique [0002] At present, a control valve group composed of a hydraulic main valve, a primary solenoid valve, and a secondary solenoid valve is often used as a control mechanism in the operating mechanism of a high-voltage circuit breaker. With the rapid development of ultra-high voltage power transmission and distribution technology, the control mechanism is required to have self-defense capability. The self-defense capability mentioned here means that when the solenoid valve is in the opening position, the closing and opening electromagnets receive power at the same time, the solenoid valve The process assurance ability of performing the closing operation first and then opening after a delay is called the self-defense ability...

AI Technical Summary

Problems solved by technology

In order to meet the needs of self-defense ability, the existing technology is: adopt auxiliary switch, micro switch and time relay to form a delay circuit. This electromechanical combination technical scheme has many links and large cumulative error. The control is unstable, the reliability is low, and it is difficult to meet the technical requirements; in order to overcome the above disadvantages, people have provided another solution, that is: using a differential piston to drive the auxiliary switch and the travel switch, and by adjusting the differential piston The area of ​​the orifice, change the flow rate and speed of the working oil, change the stop time between the opening and closing of the auxiliary switch and the travel switch contact, and then control the opening coil to realize its self-defense capability. However, this process is cumbersome. The switching time is greater than 6ms, which cannot meet the requirements of the closing-dividing time of the circuit breaker reclosing and the requirement of the national grid that the three-phase period of the second opening is not greater than 3ms

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