141
Appendix
design. The initial test values before installation should be compared with the
factory nameplate values. While checking the power factor and capacitance
values of these bushings, it is important to compare the field test values with the
initial benchmark value after installation. Any significant deviation from the
benchmark value would be a cause for concern and should be investigated.
Additional information on bushing maintenance can be found in ABB bushing
instruction leaflets IL 44-663, 665, and 666 available on our web site at
http://alamo.abbus.com.
12.5.6 Biography
Pritpal Singh is a Fellow Engineer with ABB Inc. in Alamo, TN and is engaged in
business/product development activity. In the past 41 years, he has been
involved in the design, development, and testing of transformers and bushings.
He has held different technical and management positions in BHEL (India),
General Electric (Pittsfield, MA), Westinghouse (Alamo, TN), and now with ABB
Inc. (Alamo, TN). He has been an active member of the IEEE Transformer
Committee for the past 20 years and was the Chair of the WG for the revision of
IEEE Std. C57.19.01 - 2000. Presently, he is the Secretary of Bushing
Subcommittee. He is a native of India and graduated in 1962 with a Bachelor of
Science degree in Electrical Engineering from Aligarh University.
12.5.7 References
1. IEEE Standard C57.19.00 - 1991
2. IEEE Standard C57.19.01 - 2000
3. Doble Manual for Testing of Electrical Insulations by the Dielectric Loss and
Power factor.
4. A.L. Rickely and R.E. Clark: "Application and Significance of Ungrounded
Specimen Tests", Minutes of the Doble Clients Conference 27AC60, Page
3-201.
5. D.J. Kopaczynski and S.J. Manifase: "The Doble Tap - Insulation Test For
Bushings (A Review)", Minutes of the Doble Clients Conference 57A1C90,
Page 4-3.1.
6. Raka Levi and Stan Manifase: "Further Studies of Anomalous Phenomena In
Dielectric-Loss Measurement - Transformer Bushings Model", IEEE
Transaction on Power Delivery, Vol. 10, No. 2, April 1995.
7. IEEE Standard C57.19.01 - 2000: "Performance Characteristics and
Dimensions For Outdoor Apparatus Bushings".
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