In many places, it is necessary to use voltage transformers, its capacity is relatively small, one kilovolt ampere is relatively large capacity, its main role is to provide power to relay protection devices and measuring instruments, and measured in the line of electricity, voltage and other parameters, can also protect some important devices in the circuit. There are many ways to connect it, what are the specific? What should I pay attention to when wiring?

What are the wiring methods of voltage transformers? What should I pay attention to when wiring?

Connection mode of voltage transformer

1 two phase voltage, voltage transformer connection, it is mainly used for small current grounding system, there is no voltage and line voltage or the same period, if the need phase grounding, the grounding voltage requirement of measuring two phase voltage is zero, if the wrong wiring, so it is easy to cause the period closing.

2, in the single-phase wiring, generally used for large ground current system, it is necessary to judge that the line should be the same period or no voltage, to use the bus voltage should be corresponding to the phase, when the connection can be arbitrarily connected to any phase.

3, you can also use V/V wiring, in the use of the wiring method, small ground current system needs to be bus voltage measurement, in the wiring, the two ends of the wiring can achieve the three-phase voltage measurement, but this wiring method is not able to measure the zero sequence voltage.

4, triangle connection or star connection, the use of these two kinds of connection is also more, especially in the use of bus to measure the three-phase voltage and zero sequence voltage

Wiring precautions for voltage transformers

1. In order to avoid overload operation, the working resistance in the secondary circuit should be suitable.

2, wiring should be correct, can not be connected backwards.

3, the voltage transformer in operation, can not appear short circuit phenomenon, need to install fuse and disconnecting switch.