A
simple and basic use case for sensors are the recognition of the switch state of load- switches and circuit breakers or the status of fuses.
Utility companies have more and more possibilities to control the substation switching via telecontrol units but have no response about the switching or state of a feeder.
For this use case already many Ring-Main-Units are equipped either with a capacitive tap on the bushing of a gas insulated switchgear or as dedicated capacitive support type insulator in air insulated switchgears. On the primary energy distribution, the C-Tap is integrated in conventional instrument transformers.