Precautions voltage transformer

1. Voltage transformer is put into operation in accordance with the rules of order before the test and inspect the items. For example, measuring the polarity, connect groups, shaking insulation, nuclear phase sequence.
2. Voltage transformer wiring should ensure its accuracy, the primary winding and the circuit under test in parallel, and the secondary winding should be connected to the measuring instrument, following the
Electrical protection devices or automatic device voltage coils in parallel, keeping in mind the polarity.
3. Connected to the voltage transformer secondary side load capacity should be appropriate, then the voltage transformer secondary side of the load should not exceed its rated capacity, otherwise, make transformer error increases, the accuracy of measurement is difficult to achieve.
4. Voltage transformer secondary circuit breakers is not allowed. Since the voltage transformer internal impedance is small, if the secondary circuit is shorted, there will be a large current will damage the secondary equipment and even endanger personal safety. Voltage transformer fuses can be installed on the secondary side in order to protect their self-

Body is not damaged due to short circuit the secondary side. Where possible, the primary side of the fuse should be installed to protect the high-voltage grid is not due to the high voltage winding power transformers or leads a systematic failure endangering safety.
5. To ensure that people in contact measurement instruments and the safety relay, voltage transformer secondary winding must have a little ground. Because the ground, when the primary and secondary windings insulation damage can be prevented with high voltage meter and relay endanger personal safety.
6, the voltage transformer secondary side will not allow short circuit.