IEEE 957-2005 pdf download IEEE Guide for Cleaning Insulators
1. Overview
1.1 Scope
The scope of this guide for cleaning insulators is to document the procedures used for cleaning contaminatedelectrical insulators (excluding nuc ear, toxic, and hazardous chemica contaminants), of all types. usingvaried equipment and techniques.
Because of the great variety of conditions, practices, electrical system designs, and contaminationpossibilities, this guide is offered to describe a number of approaches to insulator cleaning on powersystems. All factors must be considered to specific situations in deciding whether and how to use theinformation in this guide.
1.2 Purpose
The purpose of this guide is to present information on the equipment needed and the methods that can beused when cleaning contaminated insulators.
The methods or equipment, or both, presented in this guide are not intended to prescribe specific procedures.but to present the successful experience of many individuals who have safely cleaned contaminatedinsulators. The guide is intended to serve as a reference source for a company, or persons, seekinginformation on insulator cleaning procedures so that they may consider the experience of others inmodifying or formulating insulator cleaning programs and practices.
2. Normative references
The following referenced documents are indispensable for the application of this guide. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments or corrigenda) applies.
Electrical Equipment Washing/Cleaning, Electrical & Utility Safety Association (Ontario) Safe PracticeGuide.2001.
IEC 60479-2:1987, Effects of Current Passing Through the Human Body.~
IEEE Std 4*-1995, IEEE Standard Techniques for High-Voltage Testing.3,4IEEE Std 80-2000, IEEE Guide for Safety in AC Substation Grounding.
IEEE Std 516*-2003, EEE Guide for Maintenance Methods on Energized Power LinesIEEE Std 1048-2003, EEE Guide for Protective Grounding of Power Lines.
3. Definitions, acronyms, and abbreviations
For the purposes of this document, the following terms and definitions apply. The Authoritative Dictionaryof Standards Terms B22] should be referenced for terms not defined in this clause.
3.1 Definitions
3.1.1 ceramic insulator: Insulators made from porcelain, glass, or a general class of rigid material
3.1.2 cubic meters per second (m’/s): Volume of water or liquid discharged per second under standardconditions.
3.1.3 equivalent salt-deposit density (ESDD): A measure of contamination level.
3.1.4 insulator: In this guide, IEEE Std 957-2005, this refers to individual insulators and also the externalinsulating members of other apparatus; e.g, transformer bushings and surge arresters.
3.1.5 non-conducting or non-conductive: Made of a material of high dielectric strength.
3.1.6 overspray: A portion of the water stream that is unintentionally directed away from the device beingwashed.
3.1,7 polymer (non-ceramic) insulator: Insulators made from polymeric materials.
3.1.8 polyplastic: A synonym for polyethylene-coated, nylon-reinforced hose (used in this case to carrywater). usually considered to be non-conductive.
3.1.9 qualified worker: A person qualified to perform various line-work operations, including aerial andgroundwork
NOTE-Refer to IEEE Std 516-2003,5,6
3.1.10 skiving: The process of assembling a fitting to a hose, by trimming the outside of a hose to fit theinside dimensions of a fitting.
IEEE 957-2005 pdf download
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