User guide

M4000 Connections
1-22 72A-1230 Rev. F
July 22, 2005
M4000 Connections
1. The procedures described in the “Testing Mode” section of this chapter on
page 1-13, for connecting and disconnecting the M4000 leads in their
proper sequence should be observed and acted upon at all times.
WARNING In particular, due to the presence of static charges from nearby energized
lines, never touch the live end (hook) of the high voltage cable when
moving leads. Never hold the High Voltage cable during a test.
2. Test personnel should be aware that induced voltages or trapped charges
may be present on the equipment about to be tested. EHV circuit breakers
with grading capacitors across the interrupter contacts are especially prone
to build up a high voltage charge. Voltages high enough to damage the
M4000 Insulation Analyzer have been known to occur on this type of
equipment. Provisions should be made for draining these charges by
applying grounds prior to making your test connections. It is a good
practice to ground equipment such as capacitors, capacitor voltage
transformers, and EHV circuit breaker heads as soon as they have been
isolated for testing, and to temporarily remove the grounds only during the
short period when tests are actually being performed.
3. Perform only one job at a time on any apparatus. The situation in which
two crews are doing different tasks with the same apparatus at the same
time is an open invitation for confusion, trouble and danger to the
personnel.