Method and apparatus for gas leak detection

A method for detecting a gas leak of a gas tank of a Gas Insulated Switchgear, comprising:

• obtaining a gas pressure within the gas tank and a temperature of a tank body of the gas tank which are collected by a gauge arranged on the tank body at a plurality of time points when the Gas Insulated Switchgear operates in one or more current states;
• determining, for each of the plurality of time points, an internal average temperature of the gas tank based on the gas pressure and an ideal gas equation;
• determining, for each of the plurality of time points, a temperature rise of the tank body relative to an ambient temperature based on the temperature of the tank body;
• determining, for each of the plurality of time points, at least one additional characteristic quantity associated with the temperature rise of the tank body;
• and
• fitting the internal average temperature of the gas tank, the temperature rise of the tank body, and the at least one additional characteristic quantity to obtain a predicted relationship between the internal average temperature of the gas tank and the temperature rise of the tank body for detecting the gas leak of the gas tank.