Kev ntsuas ntawm rwb thaiv tsev capacitances thiab poob qhov tseem ceeb (tan delta) yog ib kauj ruam tseem ceeb hauv kev ua kom muaj kev nyab xeeb thiab ua haujlwm ntawm cov khoom siv hluav taws xob. Rwb thaiv tsev capacitance yog ib qho kev ntsuas ntawm lub peev xwm ntawm cov khoom siv insulating los khaws cov nqi, thaum qhov poob qis (tan delta) yog ib qho kev ntsuas ntawm qhov ua tau zoo npaum li cas cov khoom dissipates lub zog thaum raug hluav taws xob.
IEEE C57.12.90 Clause 10.10 "Insulation power-factor tests.
Kev ntsuas ntawm rwb thaiv tsev capacitances thiab poob qhov tseem ceeb (tan delta) yog qhov tseem ceeb rau kev tswj xyuas kev nyab xeeb thiab kev ua haujlwm zoo ntawm cov khoom siv hluav taws xob. Los ntawm kev siv cov ntsuas kom raug los kuaj xyuas qhov ua yuam kev thiab lub zog poob, nws muaj peev xwm ua kom kho tau ua ntej teeb meem loj tshwm sim. Kev nqis peev hauv cov cuab yeej ntsuas kom raug thiab tsim cov txheej txheem ntsuas tsis tu ncua yog qhov tseem ceeb rau txhua lub tuam txhab uas ua haujlwm nrog cov khoom siv hluav taws xob.