Ga wasu yana da kyau a matsayin ya kai tsarin absorption na abincin karamin kware?

An na yadda da absorption ratio: Idan kana yi amfani da megohmmeter (insulation resistance tester), faɗi lafiya a gaba mai tsayi 120 darajar da kullum. Rasa insulation resistance a lokacin 15 detari (R15) kuma sannan a lokacin 60 detari (R60). Ana samun absorption ratio tare da bayanin:

Absorption Ratio = R60 / R15, wanda ya shafi zai iya fi ɗaya ko kadan 1.3.

Amfani da absorption ratio taimakawa wajen tabbatar da idan insulation na abubuwa masu sauran ya ƙula. Idan insulation material ta ƙarfin rufe, leakage current component ce mai yawa, kuma insulation resistance ana nufin da charging (capacitive) current. A lokacin 15 detari, charging current tana cikin yawan yawa, wanda ke haifar da insulation resistance value (R15) a ƙarami. A lokacin 60 detari, saboda dielectric absorption characteristics na insulation material, charging current tana rage da yawan yawa, wanda ke haifar da insulation resistance value (R60) a ƙarami. Saboda haka, absorption ratio tana ƙara ƙarami.

Amma, idan insulation ta ƙula, leakage current component tana ƙara yawan yawa. Charging current wanda take nuna kan lokaci tana ƙara yawan yawa, kuma insulation resistance bai canza sosai ba a lokacin lokaci. Saboda haka, R60 da R15 suna ciki mafi girma, wanda ke haifar da absorption ratio tana rage da yawan yawa.

Saboda haka, measured value na absorption ratio taimakawa wajen tabbatar da idan insulation na abubuwa masu sauran ya ƙula.

Absorption ratio test ita da muhimmanci wa abubuwa da suka da capacitance mai yawa, kamar motors da transformers, kuma ya kamata a yi tasiri saboda environmental conditions na abubuwa. General criterion shi ne idan insulation ba ta ƙula, absorption ratio K ≥ 1.3. Amma, idan abubuwa da suka da capacitance mai ƙarami (kamar insulators), insulation resistance reading tana ƙara ƙarami a lokacin detari ɗaya ko biyu, kuma ba za a ci gaba ba—wanda ke nuna ba tana ƙara absorption effect. Saboda haka, ita ba da muhimmanci a yi absorption ratio test a abubuwa masu capacitance mai ƙarami.

Idan an yi high-capacity test specimens, standards na duniya da kasashen sama ta nuna cewa Polarization Index (PI), wanda ana define shine R10min / R1min, zai iya amfani don absorption ratio test.

Temperature tana nuna inverse proportional zuwa insulation resistance: temperatures mai yawa tana ƙara insulation resistance da kuma conductor resistance. Daga general experience, medium- da high-voltage cables suna yi rigorous partial discharge da high-voltage tests a lokacin samun dukansu. A lokacin normal, insulation resistance na medium-voltage cables tana iya ci gaba da miliyan ɗaya zuwa miliyan ɗaya a ƙarami MΩ·km.