Structure and operational requirements of clamp on current transformer

- Jun 17, 2019-

In order to ensure the long-term normal use of the clamp on current transformer, certain requirements should be met during its operation. First of all, the clamp on current transformer must not operate over the rated capacity for a long time. This is because the long-term overload, that is, the current passing through the current transformer, will cause the error to increase and the meter indication is incorrect. It may also cause the core and winding to overheat, the insulation aging is fast, and even the current transformer is damaged.

During the operation of the clamp on current transformer, care should be taken to keep its secondary circuit always closed. When removing the current meter and other instruments on the CT in operation, the secondary winding should be short-circuited first; if the secondary winding is not used, it should be short-circuited. In addition, the secondary circuit of the current transformer must have one and only one ground point. 

One side of the secondary side coil of the clamp on current transformer and the core need to be kept grounded at the same time. The secondary side of the CT is grounded to prevent the breakdown of the secondary winding due to insulation damage, the secondary winding is connected to high voltage, crisis equipment and personal