IB131006EN
Page 47
Effective 07/2017
Figure 6-4 Wipe Indication Procedure (Performed Only with Breaker Closed)
in service. If a solvent is required to cut dirt, use
Stoddard’s Solvent Eaton 55812CA or commercial
equivalent. Secondary control wiring also requires
inspection for insulation damage.
6-7 INSULATION INTEGRITY
CHECK Primary Circuit:
The integrity of primary insulation may be checked by
the 60Hz AC high potential test. The test voltage
depends upon the maximum rated voltage of the
breaker. For the breaker elements rated 4.76 kV, 8.25
kV, 15 kV and 27 kV, the test voltages are 15 kV, 27 kV,
27 kV and 45 kV RMS respectively. Conduct the test as
follows:
Close the breaker. Connect the high potential lead of the
test machine to one of the poles of the breaker. Connect
the remaining poles and breaker frame to ground. Start
the machine with output potential at zero and increase
to the test voltage. Maintain the test volt-age for one
minute. Repeat for the remaining poles. Successful
withstand indicates satisfactory insulation strength of the
primary circuit.
If a DC high potential machine is used, make certain
that the peak voltage does not exceed the peak of the
corresponding AC rms test voltage.
Secondary Circuit:
Isolate the motor by pulling apart the two insulated quick
disconnecting terminals in the two motor leads provided
for this purpose (Figure 3-3). Connect all points of the
BLUE, RED OR BROWN
CONTACT SPRINGS
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
Need help?
General
