IEC 60247:2004
Current
The latest, up-to-date edition.
Insulating liquids - Measurement of relative permittivity, dielectric dissipation factor (tan d) and d.c. resistivity
Hardcopy , PDF
English - French
06-02-2004
FOREWORD
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
Figure 1 - Example of a three-terminal cell for measurements on
liquids
Figure 2 - Example of screening for the cell of Figure 1
Figure 3 - Example of assembling drawing of cell
Figure 4 - Example of a two-terminal cell for measurements in
liquids
Figure 5 - Example of a test cell designed for low-loss
dielectric 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 |
TC 10
|
| DevelopmentNote |
Stability Date: 2019. (09/2017)
|
| DocumentType |
Standard
|
| Pages |
53
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| NF EN 60247 : 2004 | Identical |
| GOST R IEC 60247 : 2013 | Identical |
| NEN EN IEC 60247 : 2005 | Identical |
| I.S. EN 60247:2004 | Identical |
| PN EN 60247 : 2008 | Identical |
| DIN EN 60247:2005-01 | Identical |
| VDE 0380-2:2005-01 | Identical |
| IS 16840 : 2018 | Identical |
| BS EN 60247:2004 | Identical |
| EN 60247:2004 | Identical |
| AS 1767.2.2-2008 | Identical |
| UNE-EN 60247:2004 | Identical |
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