METHOD FOR MODIFYING GAS DENSITY RELAY, AND GAS DENSITY RELAY HAVING ONLINE SELF-CHECKING FUNCTION AND CHECKING METHOD THEREFOR

摘要

Provided in the present application are a method for modifying a gas density relay, and a gas density relay having an online self-checking function and a checking method therefor, which are used for high-voltage and medium-voltage electrical devices. The gas density relay comprises a gas density relay body, a gas density measurement sensor, a gas path partition pressure adjusting mechanism, an online checking contact signal sampling unit and an intelligent control unit. The intelligent control unit controls a partition piece of the gas path partition pressure adjusting mechanism to move, so as to disconnect the gas path connection between a first interface and a second interface by means of partition; 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; and the contact action is transmitted to the intelligent control unit by means of the online checking contact signal sampling unit, and the intelligent control unit measures an alarm and/or latching contact signal action value and/or a return value according to a density value during the contact action. The checking can be completed without requiring maintenance personnel to go to the site, thereby greatly increasing the reliability and efficiency of a power grid, and reducing costs.