Precautions in the operation of current transformer

In the line of power supply and electricity, the current and voltage vary widely from small to tens of thousands of amps. In order to facilitate the measurement of the secondary instrument, it is necessary to convert to a relatively uniform current, and the voltage on the line is relatively high as direct measurement is very dangerous. The current transformer acts as a transformer and electrical isolation. The precautions in the operation of the current transformer are:

The current transformer shall not open the circuit on the secondary side during operation. Once the secondary side is open, the iron loss is too large, the temperature is too high to burn, or the secondary winding voltage is increased to break the insulation, and there is a danger of high voltage electric shock. Therefore, when changing the meter, such as changing the ammeter, the active meter, the reactive meter, etc., the current loop should be shorted before the meter is exchanged. 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 wires are removed, the current transformers are open, and should be short-circuited immediately to find out that there is no open circuit in the meter circuit before the short wires can be removed. When removing the current transformer short-circuit work, it should be placed on the insulation pad. In addition, the protection device of the current transformer circuit should be deactivated. After the work is completed, the protection device can be put into operation.

When the insulation resistance of the secondary side coil of the current transformer is lower than 10~20 megohms, it must be dried to restore the insulation before use.

At one end of the secondary side of the current transformer, the outer casing must be reliably grounded.

If the current transformer is humming, check the inner core for looseness and tighten the core bolt.

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