IEC 60815-1 pdf download – Selection and dimensioning of high-voltage insulators intended for use in polluted conditions — Part 1: Definitions, information and general principles

IEC 60815-1 pdf download – Selection and dimensioning of high-voltage insulators intended for use in polluted conditions — Part 1: Definitions, information and general principles
1 scope and object
IEC/TS 60815-1,which is a technical specification, is applicable to the selection of insulators,and the determination of their relevant dimensions, to be used in high-voltage systems withrespect to pollution. For the purposes of this technical specification, the insulators are dividedinto the following broad categories, each dealt with in a specific part as follows:
-IEC/TS 60815-2-Ceramic and glass insulators for a.c. systems;
-IEC/TS 60815-3 -Polymeric insulators for a.c. systems;
-IEC/TS 60815-4 – equivalent to 60815-2 for d.c. systems1;-IEC/TS 60815-5 – equivalent to 60815-3 for d.c. systems1.
This part of lEC 60815 gives general definitions，methods for the evaluation of pollution siteseverity (SPS) and outlines the principles to arrive at an informed judgement on the probablebehaviour of a given insulator in certain pollution environments.
This technical specification is generally applicable to all types of external insulation, includinginsulation forming part of other apparatus. The term “insulator” is used hereafter to refer toany type of insulator.
CIGRE C4 documents [1],[2]，[3]2，form a useful complement to this technical specificationfor those wishing to study in greater depth the performance of insulators under pollution.
This technical specification does not deal with the effects of snow, ice or altitude on pollutedinsulators.Although this subject is dealt with by CIGRE〔1]，[4]，current knowledge is verylimited and practice is too diverse.
The object of this technical specification is to
understand and identify parameters of the system,application，equipment and siteinfluencing the pollution behaviour of insulators,
understand and choose the appropriate approach to the design and selection of theinsulator solution, based on available data, time and resources,
characterize the type of pollution at a site and determine the site pollution severity(SPS),determine the reference unified specific creepage distance (UsCD) from the SPs,
determine the corrections to the “reference” uscD to take into account the specificproperties (notably insulator profile) of the “candidate” insulators for the site，applicationand system type,
determine the relative advantages and disadvantages of the possible solutions,assess the need and merits of “hybrid” solutions or palliative measures,
if required, determine the appropriate test methods and parameters to verify theperformance of the selected insulators.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60038,IEC standard voltages
IEC 60050-471, International Electrotechnical Vocabulary – Part 471:Insulators
IEC 60305,Insulators for overhead lines with a nominal voltage above 1 000 v – Ceramic orglass insulator units for a.c. systems – Characteristics of insulator units of the cap and pintype
IEC 60433，Insulators for overhead lines with a nominal voltage above 1 000 v – Ceramicinsulators for a.c. systems – Characteristics of insulator units of the long rod type
IEC 60507:1991，Artificial pollution tests on high-voltage insulators to be used on a.c.systems
IEC/TR61245,Artificial pollution tests on high-voltage insulators to be used on d.c. systems
3Terms, definitions and abbreviations
3.1Terms and definitions
For the purposes of this document,the following terms,definitions and abbreviations apply.The definitions given below are those which either do not appear in lEC 60050-471 or differfrom those given in IEC 60050-471.
3.1.1
reference cap and pin insulator
U120B or U160B cap and pin insulator (according to lEC 60305) normally used in strings of 7to 9 units to measure site pollution severity
3.1.2
reference long rod insulator
L100 long rod insulator (according to lEC 60433) with plain sheds without ribs used tomeasure site pollution severity having a top angle of the shed between 14° and 24° and abottom angle between 8 ° and 16 and at least 14 sheds
3.1.3
insulator trunk
central insulating part of an insulator from which the sheds project
NOTEAlso known as shank on smaller diameter insulators.