&Nbsp&Nbsp&Nbsp&Nbsp; The basic structure of voltage transformers is very similar to that of transformers. It also has two windings, one called the primary winding and the other called the secondary winding. Both windings are installed or wound on the iron core. Provide insulation between two windings and between the winding and the iron core, thereby electrically insulating the two windings and between the winding and the iron core. When the voltage transformer is operating, the primary winding N1 is connected in parallel with the line, and the secondary winding N2 is connected in parallel with the instrument or relay. Therefore, when measuring voltage on high-voltage lines, although the primary voltage is high, the secondary voltage is low, which can ensure the safety of operators and instruments

 &Nbsp&Nbsp; Before putting the voltage transformer into operation, it should be tested and inspected according to the specified items in the regulations. For example, polarity measurement, connection group, vibration 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 tested circuit, and the secondary winding should be connected in parallel with the voltage coil of the connected measuring instrument, relay protection device, or automatic device. At the same time, attention should be paid to the correctness of polarity 3. The load capacity 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 it will increase the error of the transformer and make it difficult to achieve measurement accuracy