6. TEST PROCEDURES 97
6.6. Partial discharge test
The measurement of partial discharges is a
suitable means of detecting certain defects in the
equipment under test and is a useful complement
to the dielectric tests. Partial discharges may, in
particular arrangements, lead to a progressive
degradation in the dielectric strength of the
insulation, especially of solid insulation.
If agreed between operator and manufacturer a
partial discharge test may be performed to verify
the correct installation of a busbar system at
rated voltage level of ≥ 36 kV.
Testing procedures are described in IEC 62271-
200, cl. 8.101 and Annex B.
Partial discharge testing of the panel is part of
the routine tests in factory. Manufacturer uses
test circuit: Single - phase testing - procedure A.
A partial discharge test of the switchgear panels
on site is therefore not necessary, only testing
the busbars is recommended, as the busbar
connections are installed on site. We recommend
≤ 100 pC at 1.1 U
r
and ≤ 10 pC at 1.1 U
r
/ √3 as limit
values for the test.
Hazard warning
Observe the instruction manual of the
testing device.
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