High-voltage switch cabinet insulation fault characteristic gas detection system and diagnosis method

The invention discloses a high-voltage switch cabinet insulation fault characteristic gas detection and diagnosis method. The method comprises the following steps: determining selected high-voltage switch cabinet insulation fault characteristic gas components; the method comprises the following steps: detecting gas, comparing the detected gas with preset characteristic gas, carrying out detection by adopting an electrochemical sensor through reacting with detected gas and generating an electric signal in direct proportion to gas concentration to obtain gas data, judging whether preset gas exists in the gas data or not, and if the preset gas exists in the gas data, judging whether the preset gas exists in the gas data. If yes, the concentration of the preset gas is obtained, whether the concentration of the preset gas is larger than a preset value or not is judged, when the concentration of the preset gas is larger than or equal to the preset value, fault early warning information of the switch cabinet is outp