Causes For Current Transformer Burning Out and Solutions September 22,2022.

What are the main causes of current transformers being burned

. When the current transformer is undergoing secondary open circuit, relatively high voltage occurs, resulting in direct burn of the current transformer.

. The use of the current transformer exceeds its service life, which leads to serious aging of the insulator, and some serious conditions such as breakdown or discharge occur in some parts, resulting in the over-voltage burning of the current transformer.

. When the current transformer is connected to the aluminum bar, there is poor contact, which leads to serious oxidation on the contact surface, and the contact resistance is too large. Finally, the current transformer is seriously burned due to heat.

. The current transformer is overloaded by users, which leads to the occurrence of burnout.

Effective ways to prevent the current transformer from being burned:

In fact, there are a variety of cases that cause current transformer to be burned. As long as the cause is found, prevention and maintenance can be carried out directly to effectively solve the problem. The main solutions are as follows:

. The circuit breaker can be installed on the current transformer, which can effectively avoid the whole line being burned down due to the branch fault, especially to effectively ensure the timely tripping protection of the branch circuit breaker;

. The current transformer can be directly installed on the back of the circuit breaker to ensure that the circuit breaker and lightning arrester can be properly cut off when the current transformer fails. By properly strengthening the insulation test of the current transformer and the lightning arrester, the aging degree of the current transformer and the lightning arrester can be found in a timely and effective manner, and then replaced in a timely manner. In this way, the power failure and other adverse conditions caused by the burning of the current transformer can be avoided.

. Clean the current transformer regularly to reduce pollution and effectively avoid the occurrence of insulation aging.


We manufacture various precision current transformers and voltage transformers, which are widely used in electric power, energy, telecommunication, railway, industrial control and other fields.

If you have any needs, pls be free to contact us, we welcome customers to customize.

Email: sales008@mycoiltech.com

Sales engineer: Bob Bao

Tel: +86 551 6291 5885


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