IR and D/EW are affected differently by capacitance, tracking, and other things.

IR can be both qualitative and quantitative; that is, a measurement of the 
property of the insulator, as the test conditions and levels are all defined. 
IR is typically done within the rated or 'normal' operating conditions of the 
device.

D/E W testing is qualitative, where only the test level is defined, where the 
test level is significantly higher than the 'normal' operating conditions.

Typically specify IR test as part of the DVT for transformers, but not as part 
of production testing. When a manager or project engineer doubts my sanity, 
which is often, will refer to these references:

www.dtic.mil/dtic/tr/fulltext/u2/726924.pdf
https://library.ul.com/wp-content/uploads/sites/40/2015/02/UL_WP_Final_The-Dielectric-Voltage-Withstand-Test_v5_HR.pdf

Brian



From: John Woodgate [mailto:j...@woodjohn.uk] 
Sent: Monday, February 19, 2018 2:19 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Insulation resistance test

Hello, Rich. This puzzles me:
Or, it can fail the insulation resistance measurement yet pass the dielectric 
strength measurement.
how can that happen?
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-02-19 21:53, Richard Nute wrote:
Or, it can fail the insulation resistance measurement yet pass the dielectric 
strength measurement.

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