What are the instructions for using voltage transformers?
1. Before the voltage transformer is put into operation, it must be tested and inspected in accordance with the items specified in the regulations. For example, measure polarity, connection group, insulation, nuclear phase sequence, etc.
2. The wiring of the voltage transformer should ensure its correctness. The primary winding should be connected in parallel with the circuit under test. The secondary winding should be connected in parallel with the voltage coil of the connected measuring instrument, relay voltage transformer electrical protection device or automatic device. At the same time, pay attention to the correctness of the polarity.
3. The capacity of the load connected to the secondary side of the voltage transformer should be appropriate. 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, making it difficult to achieve measurement accuracy. Cold shrink cable terminals
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 damage due to a short circuit on the secondary side. Where possible, fuses 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 faults in the high-voltage windings or leads of the transformers.
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 at one point. Because after grounding, when the insulation between the primary and secondary windings is damaged, high voltages in the instruments and relays can be prevented from endangering personal safety.
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