Gas-insulated Switchgear (GIS) Testing

Condition diagnosis on gas-insulated switchgear / GIS

Gas-insulated switchgear (GIS) is very compact and therefore represents a space-saving alternative to classic air-insulated installations. The low insulation distances are guaranteed by the high dielectric strength of the sulfur hexafluoride (SF6) gas. A perfect condition of the insulation is essential for ensuring a reliable operation of GIS. The characteristics of the SF6 gas also allow the extinction of arcs which can occur during disconnection of live contacts.

As part of a GIS condition analysis also several electrical tests on the GIS circuit breakers should be regularly performed. They are necessary in order to make sure that the main contacts and the complete mechanical linkage of the breaker are in good operating condition. Our dedicated circuit breaker test system performs all common electrical tests. 

During manufacture, operation or when maintenance work is performed, the surfaces of conductors can be soiled or potentially damaged. This has a negative influence on their insulation behavior, which can then be diagnosed by partial discharge measurements.

When commissioning GIS, it is also necessary to perform a voltage withstand test in line with the standards (IEC 62271-203). To this end, we have developed a testing system with which you can demonstrate that the quality of the insulation matches the rated voltage.

Recommended solutions for condition diagnosis on gas-insulated switchgear (GIS)

CIBANO 500 + CB MC2 + CB TN3

Timing, dynamic resistance, motion and micro-ohm measurement

CPC 100 + CP RC

Voltage withstand test on GIS

MPD 600 + UHF 620

Partial discharge analysis

CPC 100 + CP RC

High-voltage source for partial discharge measurements

CT Analyzer

Testing of GIS current transformers through secondary injection


Micro-ohm measurement