26 S&C Instruction Sheet 682-510
Operation
Figure 48. Measuring the phase-to-phase voltage — Phase 1 to
Phase 1
Figure 49. Measuring the phase-to-phase voltage — Phase 2
to Phase 1
Figure 50. Measuring the phase-to-phase voltage — Phase 3
to Phase 1
STEP 4.
Determine the phase-to-phase relationships of
the two ways to be phased as follows:
(a) Remove the test probe of the voltmeter from
the switchgear tank.
(b) Place one of the test probes on Phasing Pin 1
of the first way and place the other probe on
Phasing Pin 1 of the second way. Mea sure
the phase-to-phase voltage. See Figure 48.
When comparing the same phase of the two
ways, the voltage should be zero or close to
zero, indicating the cables are in phase.
(c) Keep the test probe on Phasing Pin 1 of the
second way and move the other test probe to
Phasing Pin 2 of the first way. Measure the
phase-to-phase voltage. See Figure 49. When
comparing different phases of the two ways,
the voltage should be 1.7 to 2 times the phase-
to-ground voltage mea sured in Step 3 on
page 25.
(d) Keep the test probe on Phasing Pin 1 of the
second way and move the other test probe to
Phasing Pin 3 of the first way. Measure the
phase-to-phase voltage. See Figure 50.
Again, when comparing different phases of
the two ways, the voltage should be 1.7 to 2
times the phase-to-ground voltage mea-
sured in Step 3 on page 25 .
(e) Repeat Steps 4b through 4d for Phasing Pin
2 and Phasing Pin 3 of the second way.
(f) If all of the phase-to-phase relationships are
correct, the cables are in phase and are
properly installed.
