Online safety diagnostics of SF6 insulated equipment (Notes)
SF6 Gas is widely used in electric power industry, the internal metal kernel, dust and moisture content, are major reasons that lead to GIS fault. When there is conductive material within equipment, partial discharge produces abnormal noise, vibration and discharges with small light, in the phenomena of decomposition of SF6 gases.
Partial Discharge (PD) rises big concern for GIS, GCB and GIT.
Major Techniques employed for PD.
1. measuring electromagnetic wave to locate and judge the pd level.
2. UHF measurement and location.
3. High-frequency earthy current testing.
4. Sound tranmission and vibration test.
5. Chemical method, to analyze composition of sf6 Gases (HF/SO2/SOF2)
Actually there exists no effective method that can fix the problem well. There are both benefits and defects. among the methods, UHF is most popular at the present, but it is still difficult to measure the pd level and the cost is relative high.
Two extra research that complements the method
1. GIS discharge model or function( within or outside GIS)
2. Discharge Data Process to identify faults.
Also there are research that employs ultrasonic fault detection method which seldom sees the application.
J.ZH
Simplified Notes from
IEEETM Central Source
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