Siemens APT current transformer - what need to be paid attention to in the use of current transformer

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

1. The secondary side of the current transformer shall not be open when working. Due to the small secondary impedance of the current transformer, the secondary side of the current transformer is close to the short-circuit state during normal operation. When the secondary side is open, a high voltage will be induced, which endangers the safety of people and equipment.

2. The primary winding of the current transformer is connected in series with the side circuit, the secondary winding is connected with the side basin instrument, and the polarity of the primary and secondary coils is correct.

3. The primary winding and core of the current transformer should be reliably grounded. The load impedance of the secondary side should not be greater than the rated load impedance of the current transformer to ensure the accuracy of the side quantity.

4. The current and voltage transformers cannot be connected, so as not to be very close to the open circuit, which may lead to high voltage and unnecessary trouble.

5. When some current transformers are damaged in operation and need to be replaced, the current transformers with voltage level not lower than the rated voltage of the power grid, the same conversion ratio, correct polarity, and similar volt-ampere characteristics should be used, and should pass the test.

6. The current transformer needs to be replaced in groups due to capacity changes, and the setting value of relay protection and the magnification of the measuring instrument should also be reviewed.

Siemens APT current transformer - what need to be paid attention to in the use of current transformer

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