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4.1 PREPARATION FOR USE
The Non-Contact High Voltage Detector should be inspected for any visible
signs of damage before using, battery condition and the checks described below
should be performed to ensure that it is operating correctly.
When you first receive it, if there is any sign of damage or if the instrument does
not operate correctly, return it to the distributor from which it was purchased.
4.2 LIMITATIONS ON THE MODEL 275HVD
See Warnings on pages 11 and 12
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Testing voltages on cable composed of multiple phases may be a problem.
In particular, multiple phase cables twisted together may have their electrical
fields canceling each other out (vector sum), and a much lower detectable
field signal may result. This may lead to non-detection if the range setting is
too high. Try a lower range setting if this situation occurs. Keep in mind that
the actual line voltage may be much higher!
Problems can arise when the 3-phase circuit of 275 kV/133 kV/11 kV
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transformers are tested. The electric field of the HV and MV bus bars can
trigger the detector when it is about one meter (approx 3 ft) above the ground.
Users must be aware that this is common with most of the electric field
voltage detectors. The 275HVD can pick up adjacent circuit electrical fields to
the one being tested and may indicate the wrong information to the user.
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Electrical Field sensitivity is reduced when the 275HVD is used close to
grounding points.
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The Model 275HVD will work on cables with a concentric neutral.
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The Model 275HVD will not work on shielded cables.
4.3 TESTING THE 275HVD BEFORE OPERATING
Also read:
Switch the sensitivity to TEST. The warning buzzer should emit a continuous
audible tone and the warning light LEDs should light up. This indicates that the
sensor is operational and the battery functional.
Perform the following steps to ensure that the 275HVD detects voltage on a
known live conductor.
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Select the 240 V
voltage) conductor (if not available, rub the sensor with a cloth or against
a clothing item to generate a DC static charge which will trigger the sensor
circuit detection).
■
The warning light and warning beeper should go ON as if a live conductor was
being tested.
Non-Contact, High Voltage Detector Model 275HVD - User Manual
4. OPERATION
WARNING! - READ BEFORE USE!
range and place the sensing head near a known live (low
AC
on page 8
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