AEMC 275HVD - Operation; Preparation for Use; Limitations on the Model 275 HVD

Non-Contact, High Voltage Detector 275HVD 11
CHAPTER 4
OPERATION
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rst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 Warning on Page 5 & 6
• Testing voltages on cable composed of multiple phases may be a prob-
lem. In particular, multiple phase cables twisted together may have
theirelectricaleldscancelingeachotherout(vectorsum),andamuch
lowerdetectableeldsignalmayresult.Thismayleadtonon-detection
if the range setting is too high. Try a lower range setting if this situa-
tion occurs. Keep in mind that the actual line voltage may be much
higher!
• Problems can arise when the 3-phase circuit of a 275/133/11kV trans-
formersaretested.Theelectriceld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eldvoltagedetectors.The275HVDcanpickupadjacentcir-
cuitelectricaleldstotheonebeingtestedandmayindicatethewrong
information to the user.
• Electrical Field sensitivity is reduced when the 275HVD is used close
to grounding points.
• The Model 275HVD will work on cables with a concentric neutral.
• The Model 275HVD will not work on shielded cables.
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