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IEEE 95 Document Information:
Title
Recommended Practice for Insulation Testing of AC Electric Machinery (2300 V and Above) With High Direct Voltage
The Institute of Electrical and Electronics Engineers, Inc.
Publication Date:
Mar 20, 2002
Scope:
ForewordÂ
[This introduction is not part of IEEE Std 95-2002, IEEE Recommended Practice for Insulation Testing of AC Electric Machinery (2300 V and Above) With High Direct Voltage.]
Traditionally, the insulation of rotating machines has been tested for dielectric strength with alternating voltage. In 1952, attention was directed to testing with direct voltage. Since then, high direct voltage has been widely used. Many reports of procedure and results are found in the IEEE Transactions with expressions of widely differing opinion.
In 1957, the Insulation Subcommittee of the IEEE Rotating Machinery Committee appointed a working group to review the existing literature and to prepare a guide for the conduct and interpretation of high direct-voltage insulation tests. It was found that many methods of making the tests have been used and that there was no uniform opinion of their relative merits.
In 1971, the Insulation Subcommittee of the IEEE Rotating Machinery Committee appointed a working group to revise the existing guide to a recommended practice.
In 1996, the Materials Subcommittee of the IEEE Electric Machinery Committee appointed a working group to revise the existing recommended practice. The document has been updated in a number of respects and typical test results using the ramped voltage test method have been included.
At present there is wide usage of high direct voltage for insulation testing, but there are still areas of disagreement regarding the utility of such tests. In this recommended practice every effort has been made to state facts and to indicate what is not certain. This document gives the present opinion and evaluation of high direct-voltage insulation testing of a large number of investigators with experience in a wide area of test activities.
Many of those who have used the methods described in this recommended practice have found them to be satisfactory and a valuable addition to other test procedures. It is hoped that the use of this recommended practice will achieve more uniform results and a fuller understanding and appreciation for the benefits of the high direct-voltage dielectric test.
A general discussion of test procedures, a comparison between alternating and direct-voltage testing, and requirements for high voltage power supplies may be found in Annex A of this recommended practice. For background information on overvoltage testing, see Clause 8 of IEEE Std 56-1977 and see IEEE P62.2/ D23.a
Participants
This document was originally developed by a working group of the Insulation Subcommittee of the IEEE Rotating Machinery Committee. The members of this working group were:
C. D. Sidway, Chair
B. R. Loxley, Secretary
a Information on references can be found in Clause 2.
C. E. Asbury
J. S. Askey
B. M. Cain
A. W. W. Cameron
E. B. Curdts
J. L. Kuehlthau
H. M. Marsden
G. L. Moses
E. R. Scattergood
W. Schneider
H. R. Tomlinson
H. P. Walker
W. A. Weddendorf
E. S. Yates
The 1977 revision was prepared by a working group of the Insulation Subcommittee. The members were:
R. F. Sharrow, Chair
This revision was prepared by a working group of the Materials Subcommittee of the Electric Machinery Committee. The members were:
N. E. Nilsson, Chair
The following members of the balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention.
When the IEEE-SA Standards Board approved this standard on 20 March 2002, it had the following membership:
James T. Carlo, Chair
James H. Gurney, Vice Chair
Judith Gorman, Secretary
*Member Emeritus
J. M. Brown
A. W. W. Cameron
E. B. Curdts
R. J. Hillen
W. J. Sheets
G. Wolff
R. Bartnikas
K. Becker
J. Grant
V. Green
B. K. Gupta
M. Jacobs
W. McDermid
B. Nindra
L. Rodland
L. Rux
V. Warren
C. A. Wilson
Paul A. Anderson
William E. Anderson
Roy L. Balke
William H. Bartley
R. Bartnikas
K. Becker
Thomas H. Bishop
E. A. Boulter
Steven R. Brockschink
Stephen P. Conrad
Roger H. Daugherty
Guru Dutt Dhingra
James H. Dymond
James S. Edmonds
Franklin T. Emery
Jorge Fernandez-Daher
Nirmal K. Ghai
J. Grant
John Travis Griffith
Franklin H. Grooms
Thomas J. Hammons
Adrienne M. Hendrickson
Gary A. Heuston
Peter H. Landrieu
Antonio J. Marques-Cardoso
Walter J. Martiny
C. V. Maughan
W. McDermid Jeffrey
L. McElray Sr..
Donald G. McLaren
James R. Michalec
Gary L. Michel
Rihong Mo
Daleep C. Mohla
Glenn Mottershead
Arthur S. Neubauer
N. E. Nilsson
James A. Oliver
Madan Rana
R. V. Rebbapragada
Jesus Martinez
Rodriguez
Charles M. Rowe
James A. Ruggieri
L. Rux
Maurice A. Secrest
John Shea
Daniel Slomovitz
Greg C. Stone
Qi Su
James E. Timperley
Paul Dieter Wagner
V. Warren
Karim Younsi
H. Zhu
Sid Bennett
H. Stephen Berger
Clyde R. Camp
Richard DeBlasio
Harold E. Epstein
Julian Forster*
Howard M. Frazier
Toshio Fukuda
Arnold M. Greenspan
Raymond Hapeman
Donald M. Heirman
Richard H. Hulett
Lowell G. Johnson
Joseph L. Koepfinger*
Peter H. Lips
Nader Mehravari
Daleep C. Mohla
William J. Moylan
Malcolm V. Thaden
Geoffrey O. Thompson
Howard L. Wolfman
Don Wright
Also included is the following nonvoting IEEE-SA Standards Board liaison:
Alan Cookson, NIST Representative
Satish K. Aggarwal, NRC Representative
Andrew D. Ickowicz
IEEE Standards Project Editor
Scope
This recommended practice provides uniform methods for testing insulation with high direct voltage. It applies to stator (armature) windings of ac electric machines rated 2300 V or higher. It covers acceptance testing of new equipment in the factory or in the field after installation, and routine maintenance testing of machines that have been in service.
Keywords:
- electric machine windings
- high direct voltage
- electrical insulation
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