▁and ▁image ▁analysis ▁of ▁art ▁II , ▁edited ▁by ▁D . ▁G . ▁St ork , ▁J . ▁C odd ington ▁and ▁A . ▁Bent kow ska - K af el ▁( S PI E ▁Press , ▁ 2 0 1 1 ) ▁ ▁References ▁▁ ▁Category : Year ▁of ▁birth ▁missing ▁( l iving ▁people ) ▁Category : L iving ▁people <0x0A> </s> ▁Trans former ▁oil , ▁a ▁type ▁of ▁ins ulating ▁and ▁cool ing ▁oil ▁used ▁in ▁transform ers ▁and ▁other ▁elect rical ▁equipment , ▁needs ▁to ▁be ▁tested ▁period ically ▁to ▁ensure ▁that ▁it ▁is ▁still ▁fit ▁for ▁purpose . ▁This ▁is ▁because ▁it ▁tends ▁to ▁d eter ior ate ▁over ▁time . ▁Test ing ▁sequences ▁and ▁procedures ▁are ▁defined ▁by ▁various ▁international ▁standards , ▁many ▁of ▁them ▁set ▁by ▁A ST M . ▁Test ing ▁consists ▁of ▁meas uring ▁break down ▁voltage ▁and ▁other ▁physical ▁and ▁chemical ▁properties ▁of ▁samples ▁of ▁the ▁oil , ▁either ▁in ▁a ▁labor atory ▁or ▁using ▁port able ▁test ▁equipment ▁on ▁site . ▁ ▁Mot iv ation ▁for ▁testing ▁The ▁transform er ▁oil ▁( ins ulation ▁oil ) ▁of ▁voltage - ▁and ▁current - transform ers ▁ful fill s ▁the ▁purpose ▁of ▁ins ulating ▁as ▁well ▁as ▁cool ing . ▁Thus , ▁the ▁die lect ric ▁quality ▁of ▁transform er ▁oil ▁is ▁essential ▁to ▁secure ▁operation ▁of ▁a ▁transform er . ▁ ▁As ▁transform er ▁oil ▁d eter ior ates ▁through ▁ag ing ▁and ▁mo ist ure ▁ing ress , ▁transform er ▁oil ▁should