Circuit Breaker Operation Time (In-Service) (GIS)

In-service testing methods First trip and Voltage Based Timing (VTM) show degradation accumulated during long idle times better than their off-service counterparts because to prepare a breaker for off-service testing, it has to be operated at least once. For the First trip test method connections are made at the trip coils and the CT’s secondary side. For the Voltage Based Timing (VTM) measurement method, the connections are made at the trip cols and the VT’s secondary side. These test methods are very well suited to detected degraded lubricants, contaminated surfaces or corroded mechanical elements.

Some medium-voltage GIS types have their main contacts sealed for lifetime. Thus, they cannot be accessed easily by the test device. Thus, Voltage-based Timing Measurement (VTM) is the only measurement method available to measure the timing of such medium voltage GIS types. The measurement method can be applied to all breakers with a voltage detection system (VDS) that makes the main voltages accessible.

Have you found the perfect solution for your switchgear testing needs yet?

Check out our new solution finder and be guided to an ideal solution in only three steps:

Try out now

Benefits of this solution

Detect problems ahead of time

Any creeping problem can best be detected by a First Trip test. The CIBANO 500 has everything needed to perform this and all other important tests on circuit breakers.

Ease of use

CIBANO 500 is simple to learn and operate, making it easy for you and your team to comprehensively test your GIS.

Multi-channel timing analyzer

Record the timing of all of your main contacts and auxiliary contacts of all phases at the same time, even for large breaking systems with several breaking chambers.

CMC 430

Users of a CMC test device who also own an EnerLyzer software option, can also use their CMC for simple medium voltage circuit breaker testing. The ideal CMC test device to perform such tests is the CMC 430.