IEC/TS 60815-3, which is a technical specification, is applicable to the selection of polymer
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/TS 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 contents of this technical specification are based on CIGRE 33.13 TF 01 documents [1],
[2]1, which form a useful complement to this technical specification for those wishing to study
in greater depth the performance of insulators under pollution
This technical specification does not deal with the effects of snow or ice on polluted
insulators. Although this subject is dealt with by CIGRE [3], current knowledge is very limited
and practice is too diverse
The object of this technical specification is to give the user means to
~ determine the reference unified specific creepage distance (USCD) from site pollution
severity (SPS) class,
~ choose appropriate profiles,
~ apply correction factors for altitude, insulator shape, size and position, etc to the
reference USCD.