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How to deal with the open circuit fault of current transformer?



The current transformer is very widely used in our work and life. Its role is mainly to convert a large -value current through a certain variable ratio to a secondary current with a small value, which is protected and measured. In daily life, it is easy to have a current transformer failure, so it is important to understand how to deal with it.

Next, let's talk about how to deal with the secondary open circuit fault
1. When the secondary open circuit of the current transformer is found, it is necessary to distinguish which group of current loop the fault belongs to, the phase of the open circuit, whether it affects the protection, report to the dispatcher, and release the protection that may malfunction.

2. Try to reduce the primary load current. If the current transformer is seriously damaged, the load should be transferred, and the power failure should be checked and dealt with. If the state-owned bypass is used, the bypass power supply can be used to ensure the power supply.

2. Try to short-circuit the current transformer for the second time on the nearest test terminal, and then check and deal with the open circuit point. When short-circuiting, use a short-circuit special short-circuit wire. To be carried out according to the drawings.

3. Pay attention to the phenomenon of short-circuiting. If there are sparks when short-circuiting, it means that the short-circuiting is effective. The fault point is in the circuit below the short-circuiting point. You can further search for it. If there is no spark when short-circuiting, it may be that the short-circuiting is invalid. The fault point may be in the circuit before the short-circuit point, and the short-circuit point can be changed point by point to narrow the range to clarify the open-circuit point

5. Within the fault range, check the terminals and components that are prone to failure, and check the parts that have been touched during the operation of the circuit. For the faults detected, those that can be resolved by themselves can be processed immediately, and then the protection that has been withdrawn is put into operation. If the open circuit point is on the terminal of the transformer body, it should be treated by power failure. If the fault cannot be handled by itself or cannot be found out by itself, it should be reported to the superior and professional maintenance personnel should be sent to check and deal with it. At this time, the current transformer should be short-circuited for the second time, or the load should be transferred, and the power failure should be handled.