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4.6 Testing of Phase and Phase Sequence
Attention!
These tests can only be performed at a nominal volt-
age of at least 165 V (50 Hz) against earth.
When performing these tests, the device must be
gripped firmly at the handle of the display part.
Note:
You may wear insulating gloves when per-
forming the tests.
Tests can be impaired by unfavourable locations,
for example on wooden ladders or insulating floor
coverings, as well as in improperly earthed AC volt-
age systems.
4.6.1 Phase Test
Determination of the phase conductor is performed
by applying the test eleL2 to the conductor.
When “POL” appears on the display and the LED
lights up, the conductor is live.
4.6.2 Testing of Phase Sequence
To determine the phase sequence between two
phases in a grounded 3-phase power system apply
both test electrodes, clasp the handle of the display
part and proceed as follows:
- Search for the phase conductors using one pole
(see phase test).
- Apply both test electrodes to the two phase
conductors (display 400 V).
- When phase L1 is applied to the test electrode of
the handle marked (- L1) and to the test electrode
of the display unit marked (+L2), the LED
„
R“ appears at the display if rotation is
clockwise. If the LED „L
“ lights up, the direction
of rotation is counter-clockwise.
- The test result has to be checked by exchanging
the two test electrodes. The opposite direction
of rotation must be displayed.
If 230 V is displayed instead of 400 V, the neutral
conductor may have been contacted with one of the
test electrodes.
4.6.3 Phase Sequence Test without
Earth Potential (IT Systems)
The testing range is 20 - 1200 V AC / 50 Hz
- Identify the phase conducters by using a “pole
finder” or by bipolar testing against earth.
- Press button
IT
to start testing. The display
shows “rdy“ and “– U –“ which signalizes
readiness for testing.
- Measure the first two phases, e.g. L1 to L2.
Afterwards the display shows “chang“ and
“L1“. Switch over to the next phase with
handle L1
within 5 seconds.
Attention!
The display unit (L2) must remain at the initial phase!
- As soon as the handle L1 has been changed,
the display shows the phase sequence of the
currently
measured phases:
“RiG“ for a clockwise or “LEF“ for a counter-
clockwise rotation. The rotation direction is
additionally indicated by LEDs. A switch back to
previous phase is not possible.