NFC 27 218 : 1988
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FLUIDS FOR ELECTROTECHNICAL APPLICATIONS - METHODS FOR THE DETERMINATION OF THE LIGHTING IMPULSE BREAKDOWN-VOLTAGE OF INSULATING LIQUIDS
12-01-2013
Describes two test methods, A and B, for assessing the electrical strength of insulating liquids in a divergent field when subjected to standard lightning impulses. Method A is based on a step procedure intended to provide an estimate of impulse breakdown voltage under specific conditions. Method B is a statistical test designed to check a hypothesis about the impulse breakdown probability of an insulating liquid at a given voltage level.
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