Why does the voltage transformer have several outputs
The ring indicates the number of primary and secondary windings of the voltage transformer. One primary winding is removed, and the rest are all secondary windings. The two-coil is a primary winding and a secondary winding, and the three-coil is mostly three-phase five-column transformer, with one primary winding and two secondary winding (one star and one open triangle). As for the four secondary three winding, (winding (100√3) winding, (100√3) V winding, and 100 V winding), Four of the five plus the open triangle.
A voltage transformer is a transformer with an iron core. It is mainly composed of primary and secondary coils, core and insulation. When a voltage U1 is applied to the primary winding, a magnetic flux φ is generated in the core. According to the law of electromagnetic induction, a secondary voltage U2 is generated in the secondary winding. Changing the number of turns of primary or secondary winding can produce different ratio of primary voltage to secondary voltage, which can form different ratio of voltage transformer. According to the number of winding, it can be divided into double winding and three-winding voltage transformer. In addition to the primary side and the basic secondary side, the three-winding voltage transformer also has a set of auxiliary secondary side for ground protection.
