Current Transformers

Current Transformers (CT) are used for current metering and protection in high voltage network systems. They transform the high current on the high voltage side into low current (1 or 5 A) adequate to be processed in measuring and protection instruments (secondary equipment, such as relays and recorders). A current transformer also isolates the measuring instruments from the high voltage of the monitored circuit. Current transformers are commonly used for metering and protection in the electrical power industry.

All Trench Current Transformer designs are based on "head type" construction. CTs are available with either oil or SF6 isolation systems.

Product Portfolio
  • Current Transformer

    Oil insulated Current Transformers

    IOSK oil paper insulated current transformers are of 'head type'. Each unit is designed in accordance with the latest GB, IEC and IEEE/ANSI standards. Available in voltage ratings from 72.5 kV to 550 kV.
  • Current Transformer gas

    SF6 insulated Current Transformers

    Designed in accordance with main international standards for design, test and construction. The Current Transformers are available for a voltage range from 72,5 kV up to 800 kV with the most common ratings.