Voltage transformer. A voltage transformer, referred to as PT, also referred to as VT, is similar to a transformer, is an instrument that uses the voltage on a line. Its working principle is the same as the transformer, and the basic structure is also the core and the primary and secondary windings. The characteristic is that the capacity is small and relatively constant, and the normal operation is close to the no-load state.
Note on the use of voltage transformer:
1. Before the voltage transformer is put into operation, it should be tested according to the items specified in the regulations. For example, measuring polarity, connection groups, shaking insulation, nuclear phase sequence, etc.
2, the voltage transformer wiring should ensure its correctness, the primary winding and the measured circuit in parallel, the secondary winding should be connected to the measuring instrument, relay protection device or automatic device voltage coil in parallel, while paying attention to the correctness of the polarity.