Why can't Electrical Current Transformer run open circuit

The structure of the electromagnetic Electrical Current Transformer is similar to that of a general power transformer. It is also composed of iron core and coils. The difference between them is that the primary coil of the Electrical Current Transformer is high current, high voltage, and the secondary coil is used for measuring instruments or relays with low voltage. The current coils are connected, and the transformer is close to a short-circuit state.

When the Electrical Current Transformer is running, the secondary circuit must not be open, because when the Electrical Current Transformer is in normal operation, its primary magnetic potential and secondary magnetic potential are balanced with each other, the magnetic potential of the excitation is very small, and the magnetic density in the iron core The induced electromotive force in the secondary coil and the secondary coil are not high. If the secondary coil is open, all the primary magnetic potential will be used for excitation, the iron core will be deeply saturated, and the magnetic density will increase to a flat top state. The open secondary coil will produce a sharp peak. The induced electromotive force with high amplitude, that is to say, the secondary coil will produce a high overvoltage, this high voltage will cause great danger to electrical equipment and personal safety. At the same time, after the secondary circuit is open, the iron core will be severely saturated, causing overheating and burning the Electrical Current Transformer. Therefore, during operation, the secondary circuit of the Electrical Current Transformer is never allowed to be open.