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ASTM D2477-02e2

(Test Method)

Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies

Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies

SCOPE
1.1 This test method covers the determination of the dielectric breakdown voltage and dielectric strength of insulating gases used in transformers, circuit breakers, cables, and similar apparatus as an insulating medium. The test method is applicable only to gases with boiling points below room temperature at atmospheric pressure.
This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Apr-2002
ICS
29.040.20 - Insulating gases
Technical Committee
D27 - Electrical Insulating Liquids and Gases
Drafting Committee
D27.05 - Electrical Test
Current Stage
Ref Project

Relations

Replaces
ASTM D2477-02e1 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies
Effective Date
10-Apr-2002
Replaced By
ASTM D2477-07 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies
Effective Date
01-Oct-2007

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ASTM D2477-02e2 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power FrequenciesASTM D2477-02e2 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies
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ASTM D2477-02e2 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Insulating Gases at Commercial Power Frequencies
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
e2
Designation:D 2477–02
Standard Test Method for
Dielectric Breakdown Voltage and Dielectric Strength of
1
Insulating Gases at Commercial Power Frequencies
This standard is issued under the fixed designation D 2477; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1
e NOTE—Sections 9.1.1 and 9.1.3 were corrected editorially in September 2005.
2
e NOTE—Adjunct references were corrected editorially in April 2006.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the dielec- 4.1 The dielectric breakdown voltage and dielectric strength
tric breakdown voltage and dielectric strength of insulating of an insulating gas in a uniform field depends primarily on the
gases used in transformers, circuit breakers, cables, and similar molecular structure of the gas. As different gases are mixed
apparatus as an insulating medium. The test method is appli- either by plan or by contamination, any change in dielectric
cableonlytogaseswithboilingpointsbelowroomtemperature breakdown voltage and dielectric strength will depend on both
at atmospheric pressure. the nature and proportion of the individual gases. This test
1.2 This standard may involve hazardous materials, opera- method uses plane and spherical electrodes which provide a
tions, and equipment. This standard does not purport to nearly uniform field (see Appendix) in the area of electrical
address all of the safety concerns, if any, associated with its discharge. It is suitable for determining the dielectric break-
use. It is the responsibility of the user of this standard to down voltage and dielectric strength of different gases and
establish appropriate safety and health practices and deter- mixtures thereof for research and application evaluations and
mine the applicability of regulatory limitations prior to use. also as a field test. A more complete discussion of the
significance of the dielectric strength test is given in the
2. Referenced Documents
Appendix.
2
2.1 ASTM Standards:
5. Apparatus
D 2864 Terminology Relating to Electrical Insulating Liq-
uids and Gases 5.1 Electrical Apparatus:
3
2.2 IEEE Standard: 5.1.1 Transformer—The desired test voltage may be most
No. 4 Standard Techniques for High Voltage Testing readily obtained by a step-up transformer energized from a
2.3 ASTM Adjuncts: variable low-voltage commercial power frequency source. The
4
Dielectric cell assembly and detail (2 drawings) transformer and controlling element shall be of such size and
designthat,withthetestspecimeninthecircuit,thecrestfactor
3. Terminology
(ratio of maximum to mean effective) of the 60-Hz test voltage
3.1 Definitions: For definitions of terms used in this test
does not differ by more than 65 % from that of a sinusoidal
method, refer to Terminology D 2864. wave over the upper half of the range of test voltage. The crest
factor may be checked by means of an oscilloscope, a sphere
gap, or a peak-reading voltmeter in conjunction with an rms
1
This test method is under the jurisdiction of ASTM Committee D27 on
voltmeter. Where the waveform cannot be determined conve-
Electrical Insulating Liquids and Gases and is the direct responsibility of Subcom-
1
niently, a transformer having a rating of not less than ⁄2 kVA
mittee D27.05 on Electrical Test.
Current edition approved April 10, 2002. Published June 2002. Originally at the usual breakdown voltage shall be used. Transformers of
published as D 2477 – 66 T. Last previous edition D 2477 – 96.
larger kVA capacity may be used, but in no case should the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
powerfrequencyshortcircuitcurrentinthespecimencircuitbe
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
outside the range of 1 to 10 mA/kV of applied voltage. This
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
limitation of current may be accomplished by using a suitable
3
Available from The Institute of Electrical and Electronic Engineers, Inc.
external series resistor or by employing a transformer with
(IEEE), 445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331.
4 sufficient inherent reactance.
Detaileddrawingsofthisapparatusareavailableatanominalcostfrom:ASTM
International Headquarters. Order Adjunct No. ADJD2477.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
e2
D 2477–02
5.1.2 Circuit-Interrupting Equipment—The test transformer 5.1.4.1 Avoltmeterconnectedtothesec
...

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