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Database: 189760 (18 Oct 2025)
DL/T 421-2009 English PDF
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DL/T 421-2009
: Determination of volume resistivity of power oils
Status: Valid
DL/T 421: Evolution and historical versions
Standard ID
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Standard Title (Description)
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DL/T 421-2009
English
209
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Determination of volume resistivity of power oils
Valid
DL/T 421-2009
DL 421-1991
English
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Method for determining volume resistivity of insulating oil
Obsolete
DL 421-1991
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Basic data
Standard ID
DL/T 421-2009 (DL/T421-2009)
Description (Translated English)
Determination of volume resistivity of power oils
Sector / Industry
Electricity & Power Industry Standard (Recommended)
Classification of Chinese Standard
E38
Classification of International Standard
27.100
Word Count Estimation
8,890
Date of Issue
2009-07-22
Date of Implementation
2009-12-01
Older Standard (superseded by this standard)
DL 421-1991
Quoted Standard
GB/T 5654; ??GB/T 7597
Regulation (derived from)
Industry standard filing Notice 2009 No. 9 (No. 117 overall)
Issuing agency(ies)
National Energy Administration
Summary
This standard specifies the insulating oil, anti- oil volume resistivity method. This standard applies to insulating oil, anti- oil volume resistivity measurement, other oils medium volume resistivity can be measured with reference to the standards.