IEC TS 60815-4:2016
(Main)Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 4: Insulators for d.c. systems
Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 4: Insulators for d.c. systems
IEC TS 60815-4:2016(E) which is a Technical Specification, is applicable as first approach for the determination of the required d.c. Unified Specific Creepage Distance for insulators with respect to pollution. To avoid excessive over or under design, existing operation experience should be compared and eventually additional appropriate tests may be performed by agreement between supplier and customer. It is applicable to:
- Glass and porcelain insulators;
- Composite and hybrid insulators with an HTM or non-HTM housing. This part of IEC 60815 gives specific guidelines and principles to arrive at an informed judgement on the probable behaviour of a given insulator in certain pollution environments.
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Standards Content (Sample)
IEC TS 60815-4 ®
Edition 1.0 2016-10
TECHNICAL
SPECIFICATION
colour
inside
Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions –
Part 4: Insulators for d.c. systems
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IEC TS 60815-4 ®
Edition 1.0 2016-10
TECHNICAL
SPECIFICATION
colour
inside
Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions –
Part 4: Insulators for d.c. systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10 ISBN 978-2-8322-3704-5
– 2 – IEC TS 60815-4:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 Principles . 9
4.1 General . 9
4.2 Overall design process . 10
5 Materials . 11
6 Site severity determination . 12
6.1 Input data . 12
6.2 d.c. pollution accumulation correction: K . 12
p
6.3 Chemical composition of the pollution layer (Type A pollution) . 13
6.4 Correcting for NSDD (Type A pollution) . 13
6.5 Correcting for CUR (Type A pollution, cap and pin insulators) . 14
6.6 Effect of diameter on the pollution accumulation K . 14
d
6.7 Correction for the number of similar insulators in parallel: K . 14
s
7 Determination of the reference d.c. site severity . 15
8 Determination of the reference d.c. USCD . 16
9 Correction of the RUSCD for each candidate insulator . 17
9.1 Correction for the effect of diameter on pollution withstand performance C . 17
d
9.2 Correction for altitude C . 18
a
9.3 Determination of the required USCD for each candidate . 18
10 Checking the profile parameters . 19
10.1 General . 19
10.2 Alternating sheds defined by shed overhang . 19
10.3 Spacing versus shed overhang . 20
10.4 Minimum distance between sheds . 20
10.5 Creepage distance versus clearance. 21
10.6 Shed angle . 22
10.7 Creepage factor . 22
11 Design verification . 23
11.1 General . 23
11.2 Operating experience . 23
11.3 Laboratory testing . 23
Annex A (informative) Hydrophobicity transfer materials . 24
A.1 Qualitative flashover behaviour . 24
Annex B (informative) Dependence of USCD on pollution severity . 26
B.1 Pollution type A . 26
B.2 Pollution Type B. 28
Bibliographic References . 29
Figure 1 – Overall design process for d.c. insulation – determination of d.c. Site
Pollution Severity . 10
Figure 2 – Overall design process for d.c. insulation – determination of the required
USCD for candidate insulating solutions . 11
dc
Figure 3 – RUSCD as a function of d.c. site pollution severity . 16
dc
Figure 4 – Correction for the effect of diameter on d.c. pollution withstand
performance . 18
Figure A.1 – Dependency of specific flashover voltage over conductivity of an
electrolyte (parameter: wettability of surface) . 24
Figure B.1 – d.c. overhead lines. Collected field experience on non HTM insulators
(uncoated glass and porcelain insulators) . 26
Figure B.2 – d.c. overhead lines. Collected field experience on HTM insulators
(composite line insulators) . 27
Figure B.3 – Composite insulators: Example of the influence of CF on USCD
(laboratory tests), see CIGRE Brochure [1] for more details . 28
Table 1 – Typical ranges of K according to climatic conditions . 13
p
– 4 – IEC TS 60815-4:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SELECTION AND DIMENSIONING OF HIGH-VOLTAGE
INSULATORS INTENDED FOR USE IN POLLUTED CONDITIONS –
Part 4: Insulators for d.c. systems
FOREWORD
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IEC 60815-4, which is a technical specifi
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