IEC 60815 Guide For The Selection And Dimensioning Of High Pdf
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This standard UNE IEC/TS 60815-1:2013 EX Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 1: Definitions, information and general principles is classified in these ICS categories:
IEC/TS 80815-1:2008(E) applies to the selection of insulators, and the determination of their relevant dimensions, to be used in high-voltage systems with respect to pollution. This part of IEC 60815 gives general definitions, methods for the evaluation of pollution site severity (SPS) and outlines the 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 60815-1 cancels and replaces IEC/TR 60815, which was issued as a technical report in 1986.
The revision of IEC 60815:1986 to take into account currentexperience, knowledge and practicerelated to polluted insulators ingeneral, and specifically to include polymer insulators and tocoverd.c. systems, requires subdivision of the guide into thefollowing five parts:
As work on part 1 has progressed, it has become evident that therequirements for evaluation andmeasurement of site severity were amajor concern. The content of part 1 now principally coverssitepollution severity determination, description of the flashovermechanism, approaches forselection and dimensioning and testingtechniques. The first draft of part 1 of IEC 60815 hasbeencirculated as 36/187/CD
The basic principle of selection has changed with respect to IEC60815:1986 in that it is no longer asimple GO/NO-GO process. Thereader of this draft will discover that the information gatheredonthe pollution at the projected site (from IEC 60815-1) is used todetermine a basic creepagedistance, which is then corrected as afunction of the suitability of candidate insulators for the typeofpollution. Other factors, which take into account the influence ofprofile parameters (e.g.diameter, shed spacing etc.), are alsoapplied to this creepage distance.
This guide is applicable to the selection of ceramic and glassinsulators for a.c. systems, and thedetermination of their relevantdimensions, to be used in high voltage systems with respecttopollution.
3.1Unified Specific Creepage Distance (repeated from IEC 60815-1for clarity)The creepage distance of an insulator divided by ther.m.s. value of the highest operating voltageacross the insulator.It is generally expressed in mm/kV.NOTE This definition differsfrom that of Specific Creepage Distance where the phase-to-phasevalue of the highestvoltage for the equipment is used. For phase toground insulation, this definition will result in a value that is 3times thatgiven by the definition of Specific Creepage Distance inIEC 815 (1986). 153554b96e
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