M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 1-27
July 22, 2005
Instrument
Transformers
In addition to isolating and grounding live terminal(s) of the primary winding,
secondary fuses and other leads should be removed in order to completely and
effectively isolate the unit from the system. This is especially important in the
case of potential transformers.
Voltage Regulators Check to ensure that there are no closed secondary links in order to eliminate
the possibility of backfeed.
Surge Arresters Everyone is instructed to stand clear during the testing of surge arresters
because of the possibility of their violent failure.
Capacitors 1. Close all the grounding switches on the device housing in order to ground
the bottom terminals of the capacitor.
2. Make sure capacitor stacks are discharged before you come into contact
with them. Internal resistors should not be relied upon for discharging
individual capacitor cells. Capacitors intended for usage may not contain
internal resistors. Resistors in failed capacitor cells should be considered
suspect. For additional protection, it is recommended that the terminals of
individual cells be discharged before personnel come in contact with them.
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