Air Insulated Switchgear Testing
In the event of a malfunction, circuit breakers must disconnect the fault current as quickly and reliably as possible, thereby protecting all subsequent equipment. When open, they must insulate the contacts from one another and when closed, they must conduct the current as effectively as possible. In many regions of the world, such as the USA, or in regions of frequent earthquakes, the most popular high-voltage circuit breakers are "dead tank" units, whereas in other regions, such as in central Europe, "live tank" breakers are most common. In some parts of the world, both breaker types can be found.
Fault Recording (AIS)Show more
Fault Recording (AIS)
The GOOSE signals of an IEC 61850 controlled GIS contain the trip commands and stamps for the time of opening of the main contacts. These time markers can be used to measure the opening time in the event of a fault. These real fault records are particularly valuable for later analysis, as they are neither generated in a targeted manner, nor are they repeatable.
Circuit Breaker Operation Time (In-Service)Show more
Circuit Breaker Operation Time (In-Service)
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 coils and the VT’s secondary side.