ABB MNS switchgear special CT In order to guarantee safe and economic operation in power system, must be conducted for the operation of power equipment in the monitoring and measurement. But the general measuring and protection device can't directly access a high voltage equipment, but need to be a system of large current in proportion to transform into small current and supply measuring and protection device is used. In the measurement of alternating current high current, for ease of secondary instrument measuring need into a more uniform current (regulation in our country current transformer secondary rated as 5 a or 1 a), the other on a line voltage is higher, such as direct measurement is very dangerous. 

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