GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
prolec.energy/prolecge
14
3.12 Test for Phase Sequence
For a known system of phase rotation, the regulators carrying the leading or lagging currents can be determined as shown
in Figs. 6B and 6D.
If the system phase sequence is not known, use the following method of obtaining the proper phase relationship. The test
should be made when the regulators are carrying appreciable load.
Figure 6. Regulator Connections (6C & 6D) continued
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