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

A gas density relay with online self-check function, characterized in that it includes:

• a gas density relay body, a gas pressure chamber, a first pressure sensor, a second pressure sensor, a temperature sensor, a pressure regulating mechanism, an online check contact signal sampling unit and an intelligent control unit;
• the gas density relay body comprises a housing, a pressure detection element, a temperature compensation element, a signal generator and a signal regulating mechanism arranged in the housing;
• the gas pressure chamber is a sealed cavity enclosed by the shell, or the gas pressure chamber is a sealed cavity arranged outside the shell, and the gas pressure chamber is connected to the internal cavity of the shell;
• the first pressure sensor is connected to the pressure detection element of the gas density relay body;
• the second pressure sensor is connected to the gas pressure chamber;
• the gas path of the pressure regulating mechanism is connected to the gas pressure chamber, so as to connect the gas path of the pressure regulating mechanism with the gas pressure chamber and the second pressure sensor;
• the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas pressure chamber, so that the gas density relay body can have contact signal action;
• the online check contact signal sampling unit is connected to the gas density relay body and configured to sample the contact signal of the gas density relay body;
• the intelligent control unit is respectively connected to the pressure regulating mechanism, the first pressure sensor, the second pressure sensor, the temperature sensor and the online check contact signal sampling unit, and is configured to complete at least one of:
• the control of the pressure regulating mechanism, pressure value acquisition, temperature value acquisition, or gas density value acquisition, and detecting the contact signal action value or the contact signal return value of the gas density relay body;
• wherein, the contact signal includes at least one of:
• alarm or blocking.