Static Contact Resistance (GIS)

The static contact resistance belongs to the most important tests on circuit breakers. The test verifies whether the resistance of the current carrying contacts, in particular the joints, allows the flow of rated current within specified losses. The resistance depends on contact surface properties which are the connection points on micro-scoping level, the contact pressure and the oxidation of the surface.  A temperature increase above the specified limits changes the electrical contact surface properties which then leads to an increase of losses. This self-accelerated process can develop constantly over years until it accelerated dramatically at the end. Typical resistances values are between 10 to 100 μΩ.

Expert recommends

CIBANO 500

CIBANO 500 outputs up to 200 A DC for static contact resistance measurements with very high accuracy with a digital μΩ meter. Both sides grounded contact resistance measurement is supported for Air Insulated Switchgear (AIS) and Gas Insulated Switchgear (GIS).

Additionally, a demagnetization function is provided which removes any remanences in current transformers. This is a very handy feature for GIS or Dead Tank Design types where the current transformers might be in the contact resistance measuring path.

Benefits of this solution

Other solutions

CPC 100

The multifunctional CPC 100 can output up to 400 A DC for static contact resistance measurements.

Other solutions

COMPANO 100

The multifunctional COMPANO 100 provides up to 100 A DC to measure static contact resistance.

Videos

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State-of-the-art circuit breaker testing MV / HV

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High-voltage circuit breaker testing with OMICRON's CIBANO 500 and CB MC2

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Testing circuit breakers with OMICRON's CIBANO 500

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