Gas density relay with online self-checking function and checking method thereof

Abstract

The invention provides a gas density relay with an online self-checking function and a checking method thereof, which are used for high-voltage and medium-voltage electrical equipment. The gas densityrelay comprises a gas density relay body, a gas density detection sensor, a gas path partition pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent controlunit, wherein the intelligent control unit controls a partition piece of the gas path partition pressure adjusting mechanism to move, so as to partition the gas circuit connection of a first interface and a second interface; meanwhile, the volume of a sealed cavity is changed, and the gas pressure of the gas density relay body is slowly reduced so as to generate a contact action; the contact action is transmitted to the intelligent control unit by means of the on-line checking contact signal sampling unit, the intelligent control unit detects an alarm and / or locking contact signal action value and / or a return value according to a density value of the contact action, the checking can be completed without the need for a maintainer to go to the site, the reliability and efficiency of a powergrid are greatly improved, and the cost is reduced. Particularly, an electric control valve is not needed, so that the sealing performance is better, and the size is smaller.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a gas density relay with an online self-checking function and a checking method thereof, which is applied to high-voltage and medium-voltage electrical equipment. Background technique [0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in the power sector and industrial and mining enterprises, which has promoted the rapid development of the power industry. In recent years, with the rapid economic development, the capacity of my country's power system has expanded rapidly, and the amount of SF6 electrical equipment has increased. The role of SF6 gas in high-voltage electrical equipment is arc extinguishing and insulation. If the density of SF6 gas in high-voltage electrical equipment decreases and the micro-water content exceeds the standard, it will seriously affect the safe operation of SF6 high-voltage electrical equipment: 1) The de...

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Problems solved by technology

3) When the temperature drops, too much moisture may form condensation water, which will significantly reduce the insulation strength of the surface of the insulating part, or even flashover, causing serious damage

In addition, if the on-site inspection of the inspectors is not performed in a standardized manner, there are still potential safety hazards

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