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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.
