GE prolec VR-1 Installation, Operation And Maintenance Manual

Also see for VR-1: Installation operation & maintenance

GEH-7299A: Installation, Operation and Maintenance Manualfor Type VR1™ Single-Phase, Step Type Regulatorsprolec.energy/prolecge15Figure 7. Voltage Regulator Winding ArrangementsCatalog Numbers: 33D7072 through 77208050 through 86673025, 3050, 30754025, 405050386069Catalog Numbers: 33D3100 through 31674100 through 43335076 through 55096138, 62748833Figure 7A. Schematic diagram showing connectionsof regulator for load excited unitsFigure 7B. Schematic diagram showing connectionsof regulator for source excited unitsFor two regulators in an open delta system:1. Connect the regulators for normal open delta operation. See Figure 6B.2. Set the motor control switch to AUTO.3. Set the resistance (R) and reactance (X) adjustments on the line drop compensators of both units to zero.4. Set the voltage level on each unit to 120 volts.5. Set “X” on each regulator to 10 volts, leaving “R” on zero. Place the LDC ON/OFF switch to ON. Measure theoutput voltages of each regulator after the mechanism has operated to bring the voltage control to a balancecondition (both band and edge indicators are OFF).6. The regulator with the higher output voltage near the maximum raise position, as observed on the positionindicator, is in the lagging phase; the other is on the leading phase.For three single-phase regulators connected in a delta bank (Fig. 6D) carrying nearly balanced load and power factor of betterthan 80 percent, proceed with steps 2,3,4, and 5 as described above. If all three regulators raise their voltages, they carrylagging currents. Otherwise, if all three regulators lower their voltages, they carry leading currents.