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. The gas density relay comprises a gas density relay body, a gas density detection sensor, a check valve, a pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit. A moving part of the pressure adjusting mechanism is driven by a driving part to move so that the check valve is closed; a volume of an air chamber of the pressure regulating mechanism changes along with movement of the moving part; pressure of the gas density relay body is adjusted to rise and fall; the gas density relay body is subjected to contact action; the contact action is transmitted to the intelligent control unit through the online checking contact signalsampling unit; and the intelligent control unit detects a contact signal action value according to a density value during contact action. Verification can be completed without the need for maintainersto go to the site, reliability and efficiency of a power grid are improved, cost is reduced, and particularly, the check valve is adopted to close a gas circuit so that during operation and verification, sealing performance is better, a size is smaller, reliability is higher, and a service life is longer.

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] 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: the density of SF6 gas will decrease to a certain level. Loss of insulation and arc extinguishing properties. [0003] With the continuous vigorous development of China's smart grid, intelligent high-voltage electrical equipment, as an important part and key node of the smart substation, plays a pivotal role in the security of the smart grid. At present, most high-voltage electrical e...

AI Technical Summary

Problems solved by technology

However, power supply companies, power plants, and large-scale factories and mines need to be equipped with testers, equipment vehicles, and high-value SF6 gas in order to complete the on-site calibration and testing of gas density relays. The annual inspection cost of the high-voltage switch station is about tens of thousands to hundreds of thousands of yuan. In addition, if the on-site inspection of the inspection personnel is not performed in a standardized manner, there are still potential safety hazards

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