SELECTION AND DIMENSIONING OF HIGH-VOLTAGE INSULATORS INTENDED FOR USE IN POLLUTED CONDITIONS - PART 3: POLYMER INSULATORS FOR A.C. SYSTEMS
International Electrotechnical Committee
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
5.1 General information on common polymer housing
materials
5.2 Issues specific to polymer housing materials under
pollution
5.2.1 Reduction of creepage distance
5.2.2 Extreme pollution
6 Site severity determination
7 Determination of the reference USCD
8 General recommendations for polymer profiles
9 Checking of profile parameters
9.1 General remark
9.2 Alternating sheds and shed overhang
9.3 Spacing versus shed overhang
9.4 Minimum distance between sheds
9.5 Creepage distance versus clearance
9.6 Shed angle
9.7 Creepage factor
10 Correction of RUSCD
10.1 Correction for altitude K[a]
10.2 Correction for insulator diameter K[ad]
11 Determination of the final minimum creepage distance
12 Confirmation by testing
Annex A (informative) - Background information on pollution
induced degradation of polymer
Bibliography
Describes 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.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 36 |
