What Are the Issues to Be Aware of During the Operation of Open-Type Leakage Current Transformers?

Open-type leakage current transformers not only need attention during installation, but also during operation. Sometimes faults can also occur during operation, so it is necessary to observe them regularly. Below we will introduce what to pay attention to during the operation of the open-type leakage current transformers. Let's take a look together!

The secondary side of the open-type leakage CT current transformer must not be open-circuited during operation. Once the secondary side is open-circuited, it will burn due to excessive iron loss and high temperature, or the secondary winding voltage will rise and insulations will break down, posing a danger of high-voltage electric shock. Therefore, when changing instruments such as current meters, active power meters, and reactive power meters, the current loop should be short-circuited before the measuring instruments are changed. After the meter is adjusted properly, connect it to the secondary loop first, then remove the short-circuit wire and check if the meter is normal.

If sparks are found when removing the short-circuit wire, the open-type leakage CT current transformer has been open-circuited, and it should be immediately re-short-circuited. Only after confirming that there is no open circuit phenomenon in the measuring instrument loop, can the short-circuit wire be removed again.

When removing the short-circuit wire of the open-type leakage current transformers, stand on an insulated mat. Also, consider disabling the protection device for the open-type leakage current transformers circuit and only enable it after the work is completed.

If there is a humming sound in the open-type leakage current transformers, check if the internal iron core is loose, and tighten the iron core bolts if necessary.

The one end of the secondary side of the open-type leakage current transformers and the enclosure must be reliably grounded.

When the insulation resistance of the open-type leakage CT current transformer secondary coil is lower than 10-20 megohms, drying treatment must be carried out to restore the insulation before it can be used.

It is convenient to repair the faults of the open-type leakage CT current transformer if they are found in a timely manner. If they are left until they are completely damaged, it will be troublesome to repair and the cost will be very expensive. Therefore, attention should be paid during operation.

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