TEL TAVRIDA ELECTRIC VCB15 LD, User Manual

Page: 64 / 93

65
The CM is inherently maintenance free. However when maintenance is carried out on the switchgear then
commissioning tests should be repeated. It is also recommended to conduct regular visual checks of the module
housing and insulation of the wires connected to the CM. Test results should be treated as given in the Table 17.
7.2 Secondary circuits
Table 17 - List of tests and check-ups of CM during maintenance
Operation description Required tool Approximate timing
Auxiliary circuits insulation check
Connect all points of the secondary
circuits with a shorting wire. ISM coil
connection wires must be disconnected
from connector X3 of the CM before
the test. Wires 5 minutes
Connect the shorting wire to the high
potential lead of the high voltage tester
and ground the circuit breaker housing.
Start with zero volts, gradually increase
the test voltage to 1500 V RMS, 50 or
60 Hz. Maintain test voltage for one
minute. Power frequency withstand voltage
test set
3 minutes
If no disruptive discharge occurs, the
secondary circuits insulation level is
satisfactory. Power frequency withstand voltage
test set
-
Disconnect the shorting wire and
reattach the wires to connector X3 of
the CM. Visual check, no tool is required 5 minutes
7.3 Troubleshooting
If during installation, commissioning, operation or maintenance any non-conformity occurs, contact your nearest
Tavrida Electric sales representative. The contact data and web site links are listed at the end of this document. In
case of a non-conformity any repairs are strictly prohibited without permission from the sales representative.
To be sure that a non-conformity occured, please perfom the checks as mentioned in Table 18 prior to
contacting our regional representative.