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Junior Member
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Mar 13, 2007, 09:48 PM
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BIL(basic impulse level)
What is the importance of the BIL rating of a MV and HV equipment? Can you share me the formula how to get the BIL rating of a certain equipment?
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Uber Member
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Mar 15, 2007, 02:38 AM
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BIL is the level of a lightning strike equipment can withstand, and is not calculated. Equipment is built to certain standards and rated with a BIL in kilovolt value based on historical statistics and construction methods that have exhibited the capability to withstand a particular impulse of high voltage.
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Junior Member
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Mar 16, 2007, 09:11 PM
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In sizeing the rating of a certain equipment cb, swgr, transformer panel board do we have to cosider the BIL rating in our design.
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Uber Member
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Mar 17, 2007, 04:24 AM
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Yes, since end users such as utilities, generation, distribution, and consumers using HV equipment will have specification requirements of BIL. BIL rating will be dependent on the dielectric strength of the insulation materials used a design. Standards for supply voltages are set by IEEE and ANSI, may be best to refer to these standards or which ever standards that are applicable to you equipment or country.
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Junior Member
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Mar 17, 2007, 04:32 AM
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Can we have a free access to the ANSI or IEEE website?
Thanks
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Junior Member
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Mar 19, 2007, 02:35 AM
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is there any difference using IEEE with IEC standard? Do they have the same testing equipment parameters.
Assuming we calculate the interrupting current, do we calculate the value and select the product based on NEMA/IEEE standard or IEC standard? Say the products will be imported from Japan, Europe, and America what standard of calculation do I use?
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Uber Member
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Apr 2, 2007, 02:41 AM
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Depends on the country the product will be used in and which standard that country subscribes to.
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New Member
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Oct 24, 2013, 01:51 AM
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For a 13.8 KV system , BIL will be 95 KV for 1.2/50 Micro second standard lighting impulse testing
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