13. LiveTe ter Application and Limitation
Application :
LiveTe ter incorporate unique technology that allow it to make repeatable,
reliable mea urement in ituation where preexi ting non-contact detector
failed. Thi make the unit uitable for detecting:
•
Voltage leakage down the pole due to damaged in ulator .
•
Voltage leakage down earth wire from tran former ca ing , due to
failing tran former in ulation.
•
Patrolman work where energi ed high voltage conductor maybe
hazardou to per onnel.
•
Ground tep potential .
Limitation :
LiveTe ter i a non-contact detector and a uch depend on en ing an
electric field generated by an energized conductor. Electric field are ea ily
modified, and in ome ca e completely eliminated, in certain ituation by
the pre ence of conductor other then the energi ed conductor under te t.
The e other conductor can be either earthed or energi ed by another pha e
in the y tem . Operator hould be aware of the e effect , and take tep to
en ure the conductor to be te ted i approached in a part of the line where
no other conductor are clo e by. A good rule of thumb i to en ure all
other metal object are at lea t twice the di tance from the LiveTe ter, a the
di tance from the LiveTe ter to the conductor to be te ted. Al o it hould be
noted that an energi ed conductor laying on wet or dew covered or
ubmerged ground may till be energi ed, but po ibly will not be detected
by a non-contact detector. The moi ture di ipate the electric field.
LiveTe ter i not uitable for detecting armoured or hielded conductor ,
becau e the hielding prevent any electric field from e caping.
LiveTe ter i not uitable for detecting conductor energi ed with D.C. voltage
or at frequencie other than 50 or 60 Hz. That i it would not be uitable for
400Hz aircraft y tem , or D.C. railway y tem .
LiveTe ter i not recommended for detecting buried conductor .
6.
