What Is the Reason for Burnout of Current Transformers During Use?

Believe that everyone is not unfamiliar with CT (current transformer), especially those in the physics profession know that it is made from the principle of electromagnetic induction. Sometimes, large currents in the circuit cannot be directly measured, and the function of the current transformers is to convert the larger current into a smaller one for measurement. However, the current transformers can be burned out during operation, which is a confusing problem for many people. Below is an analysis of the causes of burning and measures that can be taken.

There are many reasons that can cause the current transformers to burn out, the most common of which are:

The secondary circuit of the current transformers is open, which produces high voltage and burns out the current transformers;
Insulation aging due to prolonged use, local breakdown or discharge occurs, producing overvoltage that causes the current transformers to heat up and burn out;
The contact surface between the primary connection of the CT (current transformer) and the aluminum busbar is excessively oxidized and the contact resistance is too large, causing the CT (current transformer) to heat up and burn out. Long-time overload running also causes the current transformer to heat up and burn out;
Install breakers to prevent branch faults from affecting the entire line power outage, especially to ensure that the branch breaker can reliably trip;
Connect the CT (current transformer) behind the circuit breaker to ensure that the circuit breaker and lightning arrester operate correctly to cut off the fault when the CT (current transformer) fails;
Strengthen the high-voltage insulation test of user current transformers and lightning arresters, detect the degree of insulation aging of the transformer and lightning arrester in time, and replace them in a timely manner, to prevent power outages caused by the burning of the current transformers;
In addition, it is also necessary to clean the user equipment in time to reduce pollution and prevent insulation degradation.

How to avoid burning of the current transformers?

First, install breakers to prevent branch faults from affecting the entire line power outage, especially to ensure that the branch breaker can reliably trip.

Then connect the CT (current transformer) behind the circuit breaker to ensure correct operation of the circuit breaker and lightning arrester to cut off the fault when the CT (current transformer) fails.

It is also necessary to strengthen the high-voltage insulation test of user current transformers and lightning arresters, detect the degree of insulation aging of the transformer and lightning arrester in time, and replace them in a timely manner to prevent power outages caused by the burning of the current transformers.

Finally, it is important to regularly clean user equipment, reduce pollution, and prevent insulation degradation.

When using a CT (current transformer), check carefully if the secondary circuit is open, if the contact resistance is too large, and most importantly, do not overload.

In addition, maintenance and upkeep of the current transformers is also necessary. If insulation aging is discovered, it should be replaced in a timely manner, and regular cleaning should be carried out to reduce pollution. This can ensure safer use and longer service life of the current transformers.

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