Electrical Current Transformer wiring principles and precautions for use

The wiring principle of Electrical Current Transformer

1. Open circuit is not allowed. The secondary open circuit can easily lead to safety accidents, because the secondary open circuit will cause the iron core to overheat and induce high voltage.

2. There must be some grounding. The Electrical Current Transformer is measured as high voltage. If there is one point grounded, the high voltage can be introduced into the ground, but pay attention to the grounding not two points to avoid shunting.

3. The protection level and measurement level cannot be wrongly connected. Once the two are connected incorrectly, it may lead to insensitive relay protection response and inaccurate power measurement.

4. The unused windings need to be short-circuited to avoid affecting the measurement accuracy, but the Electrical Current Transformer has multiple taps, and the unused taps need to be short-circuited.

Precautions for using Electrical Current Transformer

1. Generally speaking, the connection of the Electrical Current Transformer is connected according to the minus polarity, so the polarity connection should be correct. Once the connection is wrong, the measurement will be inaccurate, or even a short circuit.

2. In order to prevent the secondary winding from causing high-voltage electricity to enter the low-voltage side, damage the instrument and cause personal injury, a protective grounding point should be set.

3. For transformers using electric energy metering, if the secondary circuit is performed, then automatic devices are not required.