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BS EN 60507:2014:2018 Edition

BS EN 60507:2014:2018 Edition

$167.15

Artificial pollution tests on high-voltage ceramic and glass insulators to be used on a.c. systems

Published By Publication Date Number of Pages
BSI 2018 44
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This International Standard is applicable for the determination of the power frequency withstand characteristics of ceramic and glass insulators to be used outdoors and exposed to polluted atmospheres, on a.c. systems with the highest voltage of the system greater than 1 000 V.

These tests are not directly applicable to polymeric insulators, to greased insulators or to special types of insulators (insulators with semiconducting glaze or covered with any organic insulating material).

The object of this International Standard is to prescribe procedures for artificial pollution tests applicable to insulators for overhead lines, substations and traction lines and to bushings

It may also be applied to hollow insulators with suitable precautions to avoid internal flashover. In applying these procedures to apparatus incorporating hollow insulators, the relevant technical committees should consider their effect on any internal equipment and the special precautions which may be necessary.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
10 FOREWORD
12 1 Scope
2 Normative references
3 Terms and definitions
15 4 General test requirements
4.1 General
4.2 Test method
4.3 Arrangement of insulator for test
4.3.1 Test configuration
16 4.3.2 Cleaning of insulator
4.4 Requirements for the testing plant
4.4.1 Test voltage
4.4.2 Atmospheric corrections
17 4.4.3 Minimum short-circuit current
18 5 Salt fog method
5.1 General information
5.2 Salt solution
Figures
Figure 1 ā€“ Minimum short-circuit current, Isc min, required for the testing plant as a function of the unified specific creepage distance (USCD) of the insulator under test
19 Tables
Table 1 ā€“ Salt-fog method: correspondence between the value of salinity, volume conductivity and density of the solution at a temperature of 20 Ā°C
20 5.3 Spraying system
Figure 2 ā€“ Value of factor b as a function of solution temperature
22 Figure 3 ā€“ Typical construction of fog spray nozzle
23 5.4 Conditions before starting the test
5.5 Preconditioning process
Figure 4 ā€“ Test layout for inclined insulators
24 5.6 Withstand test
5.7 Acceptance criterion for the withstand test
6 Solid layer methods
6.1 General information
25 6.2 Main characteristics of inert materials
6.3 Composition of the contaminating suspension
6.3.1 General
6.3.2 Kieselguhr composition
Table 2 ā€“ Main characteristics of the inert materials used in solid layer suspensions
26 6.3.3 Kaolin (or Tonoko) composition
Table 3 ā€“ Kieselguhr composition: approximate correspondence between the reference degrees of pollution on the insulator and the volume conductivity of the suspension at a temperature of 20 Ā°C
27 6.4 Application of the pollution layer
Table 4 ā€“ Kaolin (or Tonoko) composition: approximate correspondence between the reference degrees of pollution on the insulator and the volume conductivity of the suspension at a temperature of 20 Ā°C
28 6.5 Determination of the degree of pollution of the tested insulator
6.5.1 General
6.5.2 Layer conductivity (K)
6.5.3 Salt deposit density (SDD)
29 6.6 General requirements for the wetting of the pollution layer
6.7 Test procedures
6.7.1 General
6.7.2 Procedure A ā€“ Wetting before and during energization
31 6.7.3 Procedure B ā€“ Wetting after energization
Figure 5 ā€“ Typical arrangement of steam-fog generator
32 6.8 Withstand test and acceptance criterion (common to both Procedures A and B)
33 Annexes
Annex A (informative) Supplementary information on the assessment of the requirement for the testing plant
Table A.1 ā€“ Expected Ih max values related to different USCD values
34 Annex B (informative) Determination of the withstand characteristics of insulators
B.1 General
B.2 Determination of the maximum withstand salinity at a given test voltage
B.3 Determination of the maximum withstand voltage, or of the 50 % withstand voltage, at a given reference layer conductivity, or at a given reference salt deposit density
B.3.1 Maximum withstand voltage
35 B.3.2 50 % withstand voltage
B.4 Withstand values of reference suspension insulators
36 Table B.1 ā€“ Ranges of values of withstand characteristics of reference suspension insulators in artificial pollution tests
37 Annex C (informative) Measurement of layer conductivity for checking the uniformity of the layer
Figure C.1 ā€“ Arrangement of the probe electrodes (all dimensions in mm)
38 Figure C.2 ā€“ Circuit diagram of the meter
39 Annex D (informative) Additional recommendations concerning the solid layer method procedures
D.1 General
D.2 Contamination practice
D.3 Drying of the pollution layer
D.4 Check of the wetting action of the fog
40 D.5 Checking fog uniformity for large or complex test objects
D.6 Fog input in the test chamber
D.7 Minimum duration of the withstand test
41 D.8 Evaluation of the reference salt deposit density (SDD)
Figure D.1 ā€“ Control of the wetting action of the steam fog: Layer conductance recording during the test on the chosen dummy insulator (standard type of Table B.1)
42 Annex E (informative) Supplementary information on artificial pollution tests on insulators for voltage systems of 800 kV and above (solid layer method procedure B)
E.1 Introduction
E.2 Test chamber
E.3 Fog generator
E.4 Wetting action and uniformity of fog density
43 Bibliography

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