What are the instructions for using voltage transformers

1. The voltage transformer shall be tested and inspected in accordance with the items specified in the regulations before being put into operation. For example, test polarity, connection group, shake insulation, nuclear phase sequence, etc.

2. The correctness of the wiring of the voltage transformer should be ensured. The primary winding should be connected in parallel with the circuit under test, and the secondary winding should be connected in parallel with the voltage coil of the connected measuring instrument, relay voltage transformer protection device or automatic device. At the same time, pay attention Correctness of polarity.

3. The capacity of the load connected to the secondary side of the voltage transformer should be appropriate, and the load connected to the secondary side of the voltage transformer should not exceed its rated capacity, otherwise, the error of the transformer will increase and it is difficult to achieve the correctness of the measurement. , Cold shrinkable cable terminal

4. Short circuit is not allowed on the secondary side of the voltage transformer. Since the internal impedance of the voltage transformer is very small, if the secondary circuit is short-circuited, a large current will appear, which will damage the secondary equipment and even endanger personal safety. The voltage transformer can be equipped with a fuse on the secondary side to protect itself from being damaged by a short circuit on the secondary side. Where possible, a fuse should also be installed on the primary side to protect the high-voltage power grid from endangering the safety of the primary system due to transformer high-voltage winding or lead failure.

5. In order to ensure the safety of people when touching measuring instruments and relays, the secondary winding of the voltage transformer must be grounded. Because after grounding, when the insulation between the primary and secondary windings is damaged, it can prevent the instrument and relay from appearing high voltage and endangering personal safety.

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