Oil Cooled CP-PT Combined Unit can be mounted on single as well as double pole system. The CP-PT Combined Unit is an oil cooled system that requires 11 KV and 33KV to operate efficiently. The CP-PT Combined Unit is mainly used for metering and check-metering purposes. Oil Cooled CP-PT Combined Unit can be made in 3 phase 3 wire and 3 phase 4 wire configurations.