ABB 2769522-C, Installation And Maintenance Manual

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Installation and maintenance guide
1ZSC000563-ACD EN, REV. A, 2019-06-25
25
5 Commissioning
5.1 Output error sources
The permittivity increases with temperature. The increase is maximum 0.5 x 10
-3
[K
-1
] relative increase for
OIP, and for RIP the change of permittivity is maximum 1.5 x 10
-3
[K
-1
] in the interval from 20 °C to 110 °C.
Losses vary with temperature. For correction of losses, refer to the instruction Bushing diagnostics and
conditioning Product information 2750 515-142.
Lab/production measured values may differ from site measurements because of different ground plane
conditions etc. The typical relative error is <1 %.
Additional error sources are the tolerances in the measuring equipment, and the timing when the operator
reads the output.
5.2 Insulation test
1. Do an insulation test according to ABB:s installation and commissioning guide for the specific bushing.
CAUTION!
Do not energize the bushing without the test adapter, or the cover installed. The cover
connects the bushing to ground, and will prevent damage to the bushing.
End of instruction