Potential Transformer Three Phase Wiring Diagram. They also can be accomplished by using three single-phase transformers that are connected externally to form a three-phase bank. The primary windings of the potential transformer are directly connected to the power circuit whose voltage is to be measured.
Three phase transformer connection diagram using this method is shown below. Primary connected between a phase and the earth. Table 14 Ratings for 3-Phase Single-Speed Full-Voltage Magnetic Controllers for Nonplugglng and Nonjogging Duty 103.
A three-phase transformer is built for a specific connection and voltage transformation and the unit will have a nameplate with the internal connections shown.
1 3 I L of the line current where I L is the line current. Phase 2 L1 L2 L3. When a single unit or bank of three is used there are four types of connections. Wiring Diagram Book A1 15 B1 B2 16 18 B3 A2 B1 B3 15 Supply voltage 16 18 L M H 2 Levels B2 L1 F U 1 460 V F U 2.