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Electronic CT/VT in AIS Application
Electronic CT/VT in AIS application can be applied to 110kV (220kV, 330kV or 500kV) substations for primary current and voltage measurement. The output signals are sent to digital measurement devices, bay control units and protective relays. Electronic CT/VT can be installed both indoors and outdoors.
Electronic CT in AIS Application
ECTs in AIS application are composed of the following four parts:
Primary sensor: The primary sensor is composed of one low power CT, two air core coils and one HV current energy acquisition coil. It is installed at the high voltage side.
Dual remote electronic modules: Each dual remote electronic module is located at the high voltage side. It receives and processes output signals for low power CT and air core coils. Remote electronic modules produde digital optic signals as their output.
Optic insulator: The optic insulator is composed of a solid prop composite insulator with eight built-in multimode optical fibers. Of these, four are used to transmit laser and digital signals, the other four serve as standby optic fibers.
Merging unit: Merging units are placed in the control room to provide laser power supply and receive three-phase current and voltage signals. The output of merging unit is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-1/2 protocols.
Electronic VT in AIS Application
EVT in AIS application is composed of the following three parts:
Capacitor voltage divider: The capacitor voltage divider converts high voltage into low voltage signals and sends them to the remote modules for processing. It also can be used as a communication carrier device.
Dual remote electronic modules: Dual remote electronic modules are located at the low voltage side. They receive and process the output signals of capacitor voltage divider. Remote electronic modules produce series digital optic signals as their output.
Merging unit: Merging units are placed in control rooms to receive three-phase voltage signals. The output of merging units is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-2 protocols.
Electronic CT/VT Groups in AIS Application
Electronic CT/VT groups are integrations of ECTs and EVTs used in AIS application. The device is composed of the following four parts:
Primary current sensors: Primary current sensors are placed at the HV side. They include one low power CT, two air core coils and one HV current draw-out coil.
Dual remote electronic modules: Dual remote electronic modules are located at the high voltage side. They receive and process the output signals of low power CTs and the air core coil. Remote electronic modules produce series digital optic signals as their output.
Capacitor voltage divider: The capacitor voltage divider converts high voltage into low voltage signals and sends them to the remote modules for processing. It also can be used as a communication carrier device.
Merging unit: Merging units are placed in control rooms to provide laser power supply and receive three-phase current and voltage signals. The output of merging units is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-2 protocols.
