IEEE 957 : 2005

1 Overview
   1.1 Scope
2 Normative references
3 Definitions, acronyms, and abbreviations
   3.1 Definitions
   3.2 Acronyms and abbreviations
4 Insulators to be cleaned
   4.1 Introduction
   4.2 Transmission line insulators
   4.3 Station equipment
   4.4 Distribution line equipment
   4.5 Large diameter equipment
   4.6 Greased insulator cleaning
   4.7 Resistive glazed insulator cleaning
   4.8 Room temperature vulcanizing coated ceramic insulator cleaning
5 Types of contaminants
   5.1 Salt
   5.2 Cement/lime
   5.3 Dusts
   5.4 Bird excrement
   5.5 Chemical
   5.6 Smog (vehicular emission)
   5.7 Cooling tower effluent
   5.8 Smoke
   5.9 Organic
   5.10 Ice/snow
   5.11 Frequency of cleaning
6 Methods
   6.1 Energized
   6.2 De-energized
   6.3 Results
7 Cleaning equipment
   7.1 High-pressure water equipment (2750 kPa to 7000 kPa)
        (400 psi to 1000 psi)
   7.2 Medium-pressure water equipment (2100 kPa to 2750 kPa)
        (300 psi to 400 psi)
   7.3 Low-pressure water equipment (1400 kPa) (200 psi)
   7.4 Compressed air, dry-type cleaner
   7.5 Fixed spray
8 Technical considerations for energized cleaning with water
   8.1 Leakage current
   8.2 Working distance
   8.3 Water quality
   8.4 Water supply
   8.5 Water pressure
   8.6 Nozzles
   8.7 Grounding
   8.8 Laboratory tests in grounded environments
   8.9 Fixed nozzle
   8.10 Helicopter-mounted nozzle
9 Industry practices
   9.1 General industry practices
   9.2 Individual company standards/rules
   9.3 Public/public relations
   9.4 Limitations
10 Summary
   10.1 Grounding
Annex A (informative) Bibliography
Annex B (informative) Maintenance of ceramic insulators after
        cleaning
Annex C (informative) English units