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INSULATORS FOR OVERHEAD LINES WITH A NOMINAL VOLTAGE ABOVE 1000 V - PART 2: INSULAR STRINGS AND INSULATOR SETS FOR A.C. SYSTEMS - DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA
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Available format(s): Hardcopy, PDF
Language(s): English
Published date: 01-01-1996
Publisher: National Standards Authority of Ireland
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.Only cited Standards give presumption of conformance to New Approach Directives/Regulations.Dates of withdrawal of national standards are available from NSAI.
SECTION 1: GENERAL1 Scope2 Normative references3 Definitions 3.1 Insulator string 3.2 Insulator set 3.3 Flash-over 3.4 Dry lightning impulse withstand voltage 3.5 50% dry lightning impulse flash-over voltage 3.6 Wet power-frequency withstand voltage 3.7 Wet power-frequency flash-over voltage 3.8 Wet switching impulse withstand voltage 3.9 50% Wet switching impulse flash-over voltage4 Electrical values which characterize an insulator or an insulator setSECTION 2: TEST PROCEDURES FOR ELECTRICAL TESTS5 General requirements for high voltage tests6 Standard atmosphere conditions and correction factors for electrical tests 6.1 Standard reference atmosphere 6.2 Correction factors for atmosphere conditions7 Artificial rain parameters for wet tests8 Mounting arrangements for electrical tests9 Lightning impulse voltage tests10 Wet power-frequency voltage tests11 Wet switching impulse voltage tests12 Methods of mounting 12.1 Standard mounting arrangement of an insulator string or insulator set when switching impulse tests are not required 12.2 Standard mounting arrangement of an insulator string or insulator set when switching impulse tests are required 12.3 Mounting arrangement reproducing service conditionsAnnex A (informative) List of normative documents given for informationAnnex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications
Applies to insulator strings and insulator sets comprising string insulator units of ceramic material or glass for use on a.c. overhead power lines with a nominal voltage greater than 1,000 V and a frequency not greater than 100 Hz.
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