Major tech MT Series - Testing for Phase Presence; Testing for Phasing: In-Phase vs. Out-of-Phase

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FEEDER “1” FEEDER “2”
FEEDER “1” FEEDER “2”
Phase “A” Phase “C”
Phase “B” Phase “B”
Phase “C” Phase “A”
M-S S-S
M-S S-S
M-S S-S
Earth
M-S S-S
Earth
Phase “A” Phase “A”
Phase “B” Phase “B”
Phase “C” Phase “C”
FEEDER “1” FEEDER “2”
Phase “A” Phase “A”
Phase “B” Phase “B”
Phase “C” Phase “C”
TESTING FOR PHASE PRESENCE
Before doing the Phase Comparison test, you must ensure that the
feeders to be compared are live.
Example:
Preparing to
Compare two Phases
From di󰀨erent feeders
Check that both phases to
be compared are Live and
have the same amplitude.
To check Phase presence,
measure the Voltage between
Phase and Earth. The result
will conrm that voltage
is present and that the
amplitude are the same.
TESTING FOR PHASING
No Indication - Neon OFF (does not
illuminate
) = IN PHASE
Indication - Neon ON (does
light up
) = OUT OF PHASE
Note that the links must be arranged so that the phases are
Connected in Phase, as indicated by the dotted lines.
Do Not Use Phasing Sticks unless you have been fully trained
In High Voltage work and understand the system fully.