IEC TS 60815-2:2008

FOREWORD
1 Scope and object
2 Normative references
3 Terms, definitions and abbreviations
   3.1 Terms and definitions
   3.2 Abbreviations
4 Principles
5 Materials
6 Site severity determination
7 Determination of the reference unified specific
   creepage distance (RUSCD)
8 Choice of profile
   8.1 General recommendations for porcelain and
        glass profiles
   8.2 Profile suitability
9 Checking the profile parameters
   9.1 Alternating sheds and shed overhang
   9.2 Spacing versus shed overhang
   9.3 Minimum distance between sheds
   9.4 Creepage distance versus clearance
   9.5 Shed angle
   9.6 Creepage factor
10 Correction of the RUSCD
   10.1 Correction for altitude K[a]
   10.2 Correction for insulator diameter K[ad]
11 Determination of the required minimum nominal
   creepage distance
12 Confirmation by testing
   12.1 Determination of the long-duration withstand
        voltage
   12.2 Selection of the standard pollution withstand
        test type
   12.3 Artificial pollution test parameters
   12.4 Criteria of confirmation
Bibliography

IEC/TS 60815-2:2008(E) 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. 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.