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This series of current transformers is suitable for indoor, rated frequency 50Hz or 60Hz, rated voltage 35KV and below small grounding current systems for three-phase cable grounding protection. It can also be used in conjunction with relays. The primary insulation of this type of transformer is guaranteed by the cable, and the product only assesses the insulation performance of the secondary winding. The ground withstand voltage of the secondary winding is 3kV for one minute.