What are the precautions for the operation of Electrical Current Transformer?

The secondary side of the Electrical Current Transformer must not be open during operation. Once the secondary side is open, it will burn out due to excessive iron loss and high temperature, or the voltage of the secondary winding will rise and the insulation will break down, which may cause high-voltage electric shock. Therefore, when changing the instrument, such as changing the ammeter, active power meter, and reactive power meter.

The current loop should be short-circuited before the metering instrument is exchanged. After the meter is adjusted, connect it to the secondary circuit first, then remove the short wiring and check whether the meter is normal. If sparks are found when the short wiring is removed, and the Electrical Current Transformer is open at this time, it should be re-shorted immediately, and the short wiring can be removed only when it is found that there is no open circuit in the meter circuit. When removing the short circuit of the Electrical Current Transformer, you should stand on the insulating pad, and consider deactivating the protection device of the Electrical Current Transformer circuit. After the work is completed, the protection device can be put into operation.

When the insulation resistance of the secondary side coil of the Electrical Current Transformer is less than 10-20 megohms, it must be dried to restore the insulation before it can be used.

At one end of the secondary side of the Electrical Current Transformer, the housing must be reliably grounded.

If the Electrical Current Transformer has a buzzing noise, check whether the inner iron core is loose, and the iron core bolts can be tightened.