A method and system for calibrating a heptafluoroisobutyl nitrile density relay

Abstract

The application discloses a heptafluoroisobutyronitrile density relay checking method and system, the density relay comprises a relay body, a gas release valve and a signal transmission interface, the checking method comprises the following steps: obtaining a checking instruction; closing the controllable valve to cut off the gas communication between the electrical equipment and the relay; adjusting the opening degree of the gas release valve according to a preset opening degree adjustment strategy, so that the gas pressure in the relay decreases at a preset rate; recording the checking data and calculating the indication error when the dial pointer reaches the pressure checking point; generating a checking result according to the indication error of each checking point; and closing the gas release valve and opening the controllable valve to restore the normal state of the relay after the checking is completed. The application realizes the fast and accurate checking of the heptafluoroisobutyronitrile density relay without inflation and disassembly, solves the technical problems of large workload, easy gas leakage, influence on insulation performance and high operation risk of the traditional checking method, and improves the checking efficiency and safety.