Lifetime prediction of a gas filling of an electrical switchgear
AssigneeEaton Intelligent Power Limited
InventorsElise Morskieft, Marcel Van Dijk, Vijay Kumar, Yogesh Rajwade
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Abstract
A method of predicting a lifetime of a gas filling of an electrical switchgear is disclosed, wherein pressure values p1, p2 in a system of the electrical switchgear containing the gas filling at a predefined temperature Tp at different points in time t1, t2 are measured. Based on the pressure difference Δp between the pressure values p1, p2 the lifetime of the gas filling is calculated. Alternatively, the pressure values p1, p2 can be taken at temperatures T1, T2 within a predefined temperature range at different points in time t1, t2.
Claims8
A method of predicting a lifetime of a gas filling of an electrical switchgear, comprising the steps of:
- a) measuring a first pressure value p1 in a system of the electrical switchgear containing the gas filling at a predefined temperature Tp at a first point in time t1 and measuring a second pressure value p2 in the system of the electrical switchgear containing the gas filling at the same predefined temperature Tp at a second point in time t2;
- or,
- b) measuring a first pressure value p1 in a system of the electrical switchgear containing the gas filling at a first temperature T1 within a predefined temperature range at a first point in time t1 and measuring a second pressure value p2 in the system of the electrical switchgear containing the gas filling at a second temperature T2 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.
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 temperature value in the 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 the 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 the 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.
Dependencies are inferred from the claim text.