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For finding a break of cable
Problems can arise when the tertiary circuit of a 275/
133/11kV transformer is tested. The electric field of the
HV and MV bus bars can trigger the detector when it is
about 3m above the ground. This is common with most
of the electric field voltage detectors. Users should be
aware of it. The tester can pick up adjacent circuit to the
one being tested and indicates the wrong information to
the user.
