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Appendix
an electrical instrument or measuring circuit to divert unwanted currents from the measuring means.
b)
Permanently connected windings, such as in autotransformers or regulators, shall be considered
as one winding.
12.4 Limits for Test Voltages for C2 Testing on Bushings
Source: Schurman, D.: Testing and maintenance of high-voltage bushings,
Western Area Power administration, Golden (Colorado), 1999.
12.5 C2 Measurement on High-Voltage Bushings
With kind permission of: Pritpal Singh, ABB Inc., USA
12.5.1 Abstract
Measurement of C2 power factor and capacitance of condenser bushings has
been a topic of much interest among the utility and other users for quite
sometimes. This paper deals with the subject of C1 and C2 power factor and
Manufacturer Bushing Type or Class Test Voltage
ABB O+C 1000
ASEA All GO types 500
BBC CTF, CTKF 500
Canadian General Electric U 1000
General Electric LC, U 500
Haefely All 500
Lapp POC 1000
Micafil WtxF 500
Micanite & Insulators All 500
Ohio Brass L 250
Ohio Brass GK, LK 500
Passoni & Villa All 500
Pennsylvania
(Federal Pacific)
P500
Westinghouse S, OS 500
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