Method and device for detecting opening and closing positions of vacuum circuit breaker contacts

Abstract

A method and device for detecting the opening and closing position of vacuum circuit breaker contacts. The method is because the capacitance on the shielding cover will change when the vacuum circuit breaker contacts are opening and closing. The size of the electric field is induced by the foil to calculate the capacitance value of the shield, so as to determine the opening and closing position of the contact; the device is composed of copper foil, an electric field sensor, and a detection and processing unit. The copper foil is attached to the surface of the vacuum circuit breaker. And it is at the same height as the shielding cover, and the copper foil is connected to the input end of the detection processing unit through wires. The detection method provided by the present invention indirectly obtains the opening and closing positions of the contacts in the arc extinguishing chamber of the vacuum circuit breaker by detecting the value of the induced electric field at the position of the shield cover on the surface of the vacuum circuit breaker. The detection device provided is simple in structure, easy to use, and low in cost. low and high measurement sensitivity.

Description

technical field [0001] The invention relates to a method and a device for detecting the opening and closing position of a contact, in particular to a method and a device for detecting the opening and closing position of a vacuum circuit breaker, belonging to the detection field. Background technique [0002] With the development of economy, the improvement of technology and information level, and the increasingly prominent global resource and environmental problems, the reliable power supply of power grid has become extremely important to users. Vigorously promoting the intelligentization of power grids has become a new challenge under the current situation of my country's power grid construction. The strong smart grid is a whole composed of various power equipment after intelligentization. The so-called intelligentization of power equipment does not mean the change of the basic principle of the equipment, but refers to the status visualization and digitalization of measurem...

AI Technical Summary

Problems solved by technology

The existing technology generally adopts the method of detecting auxiliary contacts. However, this method requires high mechanical reliability of the auxiliary contacts. Once a mechanical failure occurs, the detection of the opening and closing positions of the contacts cannot be realized.

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