Gas monitoring system and respective method

A gas monitoring system comprising:

• a gas-insulated switchgear comprising a chamber filled with an insulating gas surrounding a high or medium voltage component,
• a sensor operatively connected to the chamber and configured to generate a plurality of measurements of a physical property of the insulating gas in the chamber at a plurality of times, and
• a microprocessor configured to:
• perform, on the plurality of sensor measurements, a detection operation comprising at least one of a statistical step detection for determining whether a jump has occurred and a statistical change detection for determining whether a change has occurred, the detection operation comprising identifying an expected range based on a subset of the plurality of sensor measurements and determining whether a current sensor measurement of the plurality of sensor measurements is outside of the expected range, and
• in response to a determination that a jump and/or a change occurred:
• reset a leakage rate calculation of the insulating gas in the chamber or
• remove the jump and/or change by applying an offset to the plurality of sensor measurements.