IEC TS 60815-2:2008

IEC/TS 60815-2
Edition 1.0 2008-10
TECHNICAL
SPECIFICATION
Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions –
Part 2: Ceramic and glass insulators for a.c. systems

IEC/TS 60815-2:2008(E)
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IEC/TS 60815-2
Edition 1.0 2008-10
TECHNICAL
SPECIFICATION
Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions –
Part 2: Ceramic and glass insulators for a.c. systems

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
S
ICS 29.080.10 ISBN 978-2-88910-302-7
– 2 – TS 60815-2 © IEC:2008(E)
CONTENTS
FOREWORD.4
1 Scope and object.6
2 Normative references .6
3 Terms, definitions and abbreviations .6
3.1 Terms and definitions .7
3.2 Abbreviations .7
4 Principles .7
5 Materials .8
6 Site severity determination .8
7 Determination of the reference unified specific creepage distance (RUSCD) .8
8 Choice of profile .9
8.1 General recommendations for porcelain and glass profiles .9
8.2 Profile suitability.12
9 Checking the profile parameters .12
9.1 Alternating sheds and shed overhang.15
9.2 Spacing versus shed overhang.15
9.3 Minimum distance between sheds .16
9.4 Creepage distance versus clearance .16
9.5 Shed angle.17
9.6 Creepage factor .17
10 Correction of the RUSCD.17
10.1 Correction for altitude K .18
a
10.2 Correction for insulator diameter K .18
ad
11 Determination of the required minimum nominal creepage distance.19
12 Confirmation by testing.19
12.1 Determination of the long-duration withstand voltage.19
12.2 Selection of the standard pollution withstand test type.19
12.3 Artificial pollution test parameters.20
12.4 Criteria of confirmation .21
Bibliography.22

Figure 1 – RUSCD as a function of SPS class .9
Figure 2 – Typical “standard” profiles.10
Figure 3 – Typical “open” profiles.11
Figure 4 – Typical “anti-fog” profiles.11
Figure 5 – Typical “alternating” profiles .11
Figure 6 – Typical pin insulator shed profiles .12
Figure 7 – K as a function of insulator diameter .18
ad
TS 60815-2 © IEC:2008(E) – 3 –

Table 1 – Principal advantages (+) and disadvantages (-) of main profile types .10
Table 2 – Profile suitability, relative to a standard profile, for porcelain and glass
insulators assuming the same creepage distance per unit or string .13
Table 3 – Profile suitability, relative to a standard profile, for porcelain and glass
insulators assuming the same insulating length .14
Table 4 – Artificial pollution test parameters for confirmation by testing .20

– 4 – TS 60815-2 © IEC:2008(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS
INTENDED FOR USE IN POLLUTED CONDITIONS –

Part 2: Ceramic and glass insulators for a.c. systems

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC/TS 60815-2, which is a technical specification, has been prepared by technical
committee 36: Insulators.
This first edition of IEC/TS 60815-2, together with IEC/TS 60815-1, cancels and replaces
IEC/TR 60815, which was issued as a technical report in 1986. It constitutes a technical

TS 60815-2 © IEC:2008(E) – 5 –
revision and now has the status of a technical specification. The text of this technical
specification is based on the following documents:
Enquiry draft Report on voting
36/265/DTS 36/271A/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2
A list of all the parts in the future IEC 60815 series, under the general title Selection and
dimensioning of high-voltage insulators intended for use in polluted conditions, can be found
on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – TS 60815-2 © IEC:2008(E)
SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS
INTENDED FOR USE IN POLLUTED CONDITIONS –

Part 2: Ceramic and glass insulators for a.c. systems

1 Scope and object
IEC/TS 60815-1, which is a technical specification, is applicable to the selection of ceramic
and glass insulators for a.c. systems, and the determination of their relevant dimensions, to
be used in high-voltage systems with respect to pollution.
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.
The basis for the structure and approach of this part of IEC 60815 is fully explained in
...