# IEEE C62.82.1-2010 pdf free

**IEEE C62.82.1**-2010 pdf free.IEEE Standard for Insulation Coordination- Definitions, Principles, and Rules.

For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary: Glossary of Terms & Definitions LB 1] should bc consulted for tcnns not defincd in this clausc.t

3.1 atmospheric correction factor: A factor applied to account for the difference between the atmospheric conditions in service and the standard atmospheric conditions.

NOTE—In temis of this standard. it applies to insulation exposed to the atmosphere only.

3.2 bask lightning impulse insulation level (BIL): The electrical strength of insulation expressed in terms of the crest value of a standard lightning impulse under standard atmospheric conditions. BIL may be expressed as either statistical or conventional.

3.3 basic sss itching impulse insulation level (HSL): The electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. BSL may be expressed as either statistical or conventional.

3.4 conventional 811. (basic lightning impulse insulation level): The crest value of a standard lightning impulse for which the insulation shall not exhibit disruptive discharge when subjected to a specitic number of applications of this impulse under specified conditions, applicable specifically to non-self-restoring insulations.

3.5 conventional BSL (basic switching impulse insulation level): The crest value of a standard switching impulse for which the insulation does not exhibit disruptive discharge when subjected to a specific number of impulses under specified conditions, applicable to non-self-restoring insulations.

3.6 conventional sithsiand soltage: The voltage that an insulation system is capable of withstanding without failure or disruptive discharge under specified test conditions.

3.7 crest value (peak value): The maximum absolute value of a function when such a maximum exists.

3.N critical flashoser (CFO) voltage: The amplitude of voltage of a given waveshape that, under specified

conditions, causes flashover through the surrounding medium on 50% of the voltage applications.

3.9 effectively grounded system: A system grounded through a sufficiently low impedance such that for all system conditions the ratio of zero-sequence reactance to positive-sequence reactance (XOXI) is positive and less than 3, and the ratio of zero-sequence resistance to positive-sequence reactance (R0.’Xl) is positive and less than I.

3.10 esternal insulation: The air insulation and the exposed surfaces of solid insulation of equipment. which are both subject to dielectric stresses and to the effects of atmospheric and other external conditions such as contamination, humidity, and vermin.

3.11 Iront-of-wase lightning impulse voltage shape: A voltage impulse, with a specitied rate-of-rise, that is terminated intentionally by sparkover of a gap that OCCUrS on the rising front of the voltage wave with a specified time to sparkover. and a specified minimum crest voltage.IEEE C62.82.1 pdf free download.