What are the precautions during the operation of the Residual Current Transformer

The secondary side of the residual 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, resulting in the risk of high-voltage electric shock. . Therefore, when changing meters, such as interchange of ammeters, active meters, and reactive meters, the current loop should be short-circuited before the metering meter interchange should be stopped. When the meter is adjusted, first connect it to the secondary circuit and then remove the short wiring and check whether the meter is normal. If sparks are found when the short wiring is removed, the residual current transformer has been opened at this time, and it should be re-shorted immediately. Only when it is found that there is no open circuit in the meter circuit, can the short wiring be removed again. When you stop removing the short-circuiting work of the residual current transformer, you should stand on the insulating pad. In addition, consider stopping the maintenance and installation of the residual current transformer circuit. After the end of the work, the maintenance and installation can be put into operation.

When the insulation resistance of the secondary side coil of the residual current transformer is lower than 10-20 megohms, the drying process must be stopped to restore the insulation before it can be used.

One end of the secondary side of the residual current transformer, and the shell must be firmly grounded.

If the residual current transformer has a buzzing noise, check whether the internal dead center can be loosened, and tighten the dead center bolt.