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 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.

이 솔루션의 이점

All important tests on breakers

CIBANO 500 combines a micro-ohmmeter, timing analyzer, and a coil and motor supply. All-important circuit breaker tests on all types of breakers can be carried out even when a station battery is not available.

Powerful integrated supply

The integrated power supply can output a highly accurate, digitally generated output signal of up to 2.4kW.

High measurement accuracy

Using four measurement ranges, CIBANO 500 can accurately determine contact resistances with an accuracy of better than 1 µΩ.

기타 솔루션

CPX 200

The CPX 200 performs highly accurate static contact resistance measurements on circuit breakers with a current rating of up to 1000 A DC. It’s designed for extended output cycles, ensuring installed current transformers are properly saturated.

When working in tight spaces, the high-current cable and clamp can be separated, enabling the cable to be mounted directly to suitable access connectors.