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Current Transformers - Considerations
Aug 19, 2017

Current transformers - Considerations

At run time, the side edges are not allowed to open. Because once the circuit is opened, the primary side current becomes the excitation current, which makes the magnetic flux and the secondary voltage greatly exceed the normal value, and endangers the safety of the human body and equipment. Therefore, in the secondary circuit of the current transformer, the fuse is not allowed, and the ammeter, relay and other devices are not allowed to be removed at the time of operation without bypass.

When the current transformer is running, the auxiliary side is not allowed to open. The reasons are as follows:

The current transformer is a measured current magnetic potential I1N1 in the core magnetic flux Phi 1

Potential I2N2 two meter, current transformer current magnetic flux generated in the core diameter of 2

Core 3: current transformer with magnetic flux phi = Phi 1 + Phi 2

Because the 1. Phi Phi 2 in the opposite direction, equal and cancel each other, so phi = 0

If the two open, that is: I2 = 0, phi = Phi 1, core flux current transformer is very strong, saturated core heat, burned insulation leakage.

If the two open, that is: I2 = 0, phi = Phi 1, Phi produces high EMF e at the two N2 coil current transformer, current transformer in the two ends of the coil to form a high pressure, endanger the life safety of operating personnel

The current transformer secondary coil two is connected with the ground, the protection measures taken in order to prevent the Danger! High Voltage.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
sunny.ni@great-relay.com