Lifetime prediction of a gas filling of an electrical switchgear

A system for predicting a lifetime of a gas filling of an electrical switchgear, the system comprising:

• i. a pressure sensor for measuring a pressure value in a system of the electrical switchgear, said pressure sensor including a capacitor having an elastomer as a dielectric material between two electrodes of the capacitor;
• ii. a temperature sensor for measuring a pressure value in a system of the electrical switchgear;
• iii. an evaluation unit, which comprises a processor and a memory, said capacitive pressure sensor and the temperature sensor being connected to the evaluation unit;
• wherein the system is configured to perform the steps of:
• a) measuring, using said pressure sensor, a first pressure value p1 in a system of the electrical switchgear containing the gas filling at a predefined temperature Tp, measured using said temperature sensor , at a first point in time t1 and measuring a second pressure value p2, using said pressure sensor , in the system of the electrical switchgear containing the gas filling at the same predefined temperature Tp, measured using said temperature sensor , at a second point in time t2;
• or,
• b) measuring, using said pressure sensor, a first pressure value p1 in a system of the electrical switchgear containing the gas filling at a first temperature T1, measured using said temperature sensor , within a predefined temperature range at a first point in time t1 and measuring a second pressure value p2, measured using said pressure sensor , in the system of the electrical switchgear containing the gas filling at a second temperature T2, measured using said temperature sensor , within the same predefined temperature range at a second point in time t2;
• calculating a pressure difference Δp between the first pressure value p1 and the second pressure value p2;
• and,
• calculating a lifetime of the gas filling based on said pressure difference Δp, wherein, the first pressure value p1 and/or the second pressure value p2 is calculated based on a volume change of a capacitor having an elastomer as a dielectric material between two electrodes of the capacitor.