I believe everyone is no stranger to current transformers, especially physics professionals know that it is manufactured by the principle of electromagnetic induction. Sometimes the large current in the circuit cannot be measured directly. The function of the current transformer is to convert a large current into a small current and then measure it. However, the current transformer will be burned in the work, which is a lot of people confused, the following for everyone to analyze the causes and measures of burning.

There are many reasons for the burning of current transformers, the common ones are the following. The secondary open circuit of the current transformer generates high voltage, causing the current transformer to burn out; The insulation is aged for a long time, and local breakdown or discharge occurs, resulting in overvoltage, causing the current transformer to heat up and burn out. The contact surface of the primary connection aluminum row of the current transformer is too oxidized, the contact resistance is too large, and the heat causes the current transformer to burn out. The user's overload operation time is long, causing the current transformer to heat and burn out.

How to avoid the current transformer burning? First, install a circuit breaker to avoid the branch fault spread to the entire line power outage, especially to ensure that the branch circuit breaker can be reliably tripped. Then connect the current transformer to the back of the circuit breaker to ensure that the circuit breaker and lightning arrester act correctly to remove the fault when the transformer fails. It is also necessary to strengthen the high-voltage insulation test of current transformers and lightning arresters for users, find out the aging degree of insulation of transformers and lightning arresters as early as possible, and replace them in time to avoid power outages caused by transformer burnout. Finally, it is necessary to regularly clean the user equipment once to reduce pollution and avoid insulation reduction.

When using the current transformer, carefully check whether the secondary circuit is open, whether the contact resistance is too large, and the most important thing is not to overload operation. In addition, the current transformer must be maintained and maintained. If the insulation is found to be aging, it must be replaced in time and cleaned regularly to reduce pollution. Only in this way can the current transformer be used more safely and have a longer service life.