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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.
