Power transformer PCS-9250

currentsubstationcapacitor voltage

To keep pace with the increasing demands of transmission capacity and rising system voltage, NR Electric has pursued advanced research on electronic CTs and VTs to ensure maximum reliability and availability in the applications of metering and protection relays. ECTs/EVTs have the advantages of no magnetic saturation, none ferromagnetic resonance, large dynamic measuring scope, wide frequency band and compact structure. NR Electric’s electronic CTs/VTs are suitable for both gas-insulated switchgears (GIS) and air-insulated switchgears (AIS). Furtheremore, they have been tested in the laboratory and been successfully put in-service in real substation applications worldwide. 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.