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Electronic CT/VT in GIS Application
The electronic CT/VT for GIS can be applied to the 110kV (220kV, 330kV or 500kV) gas insulation switch for measuring primary current and voltage. The output signals are sent to digitizing measuring devices, bay control units and protective relays. Electronic CT/VT can be installed both indoors and outdoors.
Electronic CT/VT in GIS application are composed of the following three parts:
Main Body:
The main body includes transformer tank, adapter flange, insulation salver, primary conductor, built-in current and voltage sensor. The space between primary conductor and the transformer tank is filled with SF6 insulating gas.
Primary Sensor:
The primary sensor is composed of two duplicated sensors, each of which includes one low power CT (LPCT), one air core coil and one coaxial capacitor voltage divider.
Remote end module:
The electronic CT/VT for GIS is composed of two duplicated remote end modules. These are used to receive and process output signals for low power CTs, air core coils and the capacitor voltage divider. The output signals of remote end modules are transmitted to merging units through optical fibers. Primary sensors and remote end modules are all installed at the high voltage side with a duplicated configuration.
