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BS EN 60247:2004

Current
Current

The latest, up-to-date edition.

Insulating liquids. Measurement of relative permittivity, dielectric dissipation factor (tan δ) and d.c. resistivity
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

26-04-2004

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General
   4.1 Permittivity and dielectric dissipation factor (tan delta)
   4.2 Resistivity
   4.3 Sequence of determinations
   4.4 Factors leading to erroneous results
5 Apparatus
   5.1 Test cell
   5.2 Test equipment
   5.3 Glassware
   5.4 Measuring instrument for permittivity and tan delta
   5.5 Measuring instrument for d.c. resistivity
   5.6 Time-measuring device
   5.7 Safety
6 Cleaning solvent
7 Cleaning the test cell
   7.1 Trisodium phosphate cleaning procedure
   7.2 Storage of cell
8 Sampling
9 Preparation of samples
10 Conditioning and filling the test cell
   10.1 Cell conditioning
   10.2 Filling the cell
11 Test temperature
12 Measurement of dissipation factor (tan delta)
   12.1 Test voltage
   12.2 Measurement
   12.3 Report
13 Measurement of relative permittivity
   13.1 Measurement
   13.2 Report
14 Measurement of d.c. resistivity
   14.1 Test voltage
   14.2 Time of electrification
   14.3 Measurement
   14.4 Report
Annex A (informative) Example of an alternative procedure
        for cleaning the test cell - Ultrasonic procedure
Annex B (informative) Example of a simplified cleaning
        procedure for a test cell
Annex C (informative) Alternative procedures for routine
        testing of dielectric dissipation factor and resistivity
        of insulating liquids
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Defines methods for the determination of the dielectric dissipation factor (tan delta), relative permittivity and d.c. resistivity of any insulating liquid material at the test temperature. The methods are primarily intended for making reference tests on unused liquids.

Describes methods for the determination of the dielectric dissipation factor, relative permittivity and d.c. resistivity of any insulating liquid material at the test temperature. The methods are primarily intended for making reference tests on unused liquids. They can also be applied to liquids in service in transformers, cables and other electrical apparatus. However the method is applicable to a single phase liquid only. When it is desired to make routine determinations, simplified procedures, as described in Annex C, may be adopted. With insulating liquids other than hydrocarbons, alternative cleaning procedures may be required. The main changes from the previous edition deal with the preferred measurement method.

Committee
GEL/10
DevelopmentNote
Supersedes BS 5737(1979) & 99/243524 DC (05/2004)
DocumentType
Standard
Pages
30
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
UNE-EN 60247:2004 Identical
I.S. EN 60247:2004 Identical
EN 60247:2004 Identical
DIN EN 60247 : 2005 Identical
NF EN 60247 : 2004 Identical
IEC 60247:2004 Identical
NBN EN 60247 : 2005 Identical

08/30167496 DC : DRAFT FEB 2008 BS 148 - RECLAIMED MINERAL INSULATING OIL FOR TRANSFORMERS AND SWITCHGEAR - SPECIFICATION
BS 148:2009 Reclaimed mineral insulating oil for transformers and switchgear. Specification

IEC 60250:1969 Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio frequencies including metre wavelengths
IEC 60475:2011 Method of sampling insulating liquids
EN 61620:1999 Insulating liquids - Determination of the dielectric dissipation factor by measurement of the conductance and capacitance - Test method
HD 429 : 200S1 METHODS OF TEST FOR VOLUME RESISTIVITY AND SURFACE RESISTIVITY OF SOLID ELECTRICAL INSULATING MATERIALS
IEC 60093:1980 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
IEC 61620:1998 Insulating liquids - Determination of the dielectric dissipation factor by measurement of the conductance and capacitance - Test method

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