Measurement and protection devices usually can not be directly connected to a high voltage, high current power loop

To ensure the power system security and economic operation of the power system needs of various electrical equipment and its related  Circuit breaker  measured in order to make the necessary measurement, monitoring and protection. Measurement and  mcb circuit breaker  usually can not be directly connected to a high voltage, high current power back on the road, while the high level of electrical parameters need to be converted into a low  electric transformer  or signals. Current transformer (CT) is a large current in proportion to the circuit is converted into a secondary small current measuring apparatus the primary and secondary windings wound on the same core of the closed magnetic circuit.