Preventiv tes bilong pepa-insulet na raba-plastik-insulet kebol i save involvim tasol ol tes bilong insulesen resistens na sanap strong bilong voltej.
Taim yu testim 'cable insulation resistance', plis luksave long ol dispela samting:
1) Rot bilong skelim 'insulation resistance' em i gutpela long ol kebol we i no longpela tumas. Ol i save yusim wanpela 'megohmmeter' long skelim na skelim 'absorption ratio'. Aninit long wankain tes kondisen, gutpela insulesen bilong kebol, moa 'absorption ratio' i go antap.
2) I no gat ol spesifik regulesen bilong ol 'cable insulation resistance' veliu. Insulesen kondisen bilong wanpela kebol i mas kamap long rot bilong skelim wantaim ol rekot bilong pastaim. Bikos tempereja i save afektim insulesen resistans bilong wanpela kebol, ol weta kondisen olsem tempereja bilong win na humiditi i mas stap long taim bilong tes bilong insulesen bilong kebol bilong skelim.
3) Megohmmeter long yusim: Long ol kebol we i gat voltej aninit long 1 kV, yusim wanpela 500-1000 V megohmmeter; long ol kebol we i gat 1 kV na antap, yusim wanpela 1000-2500 V megohmmeter.
4) Pastaim long testim, kebol i mas lus olgeta na putim graun long en long rot bilong putim graun long 'conductive core' na 'metal sheath' bilong kebol.
5) Pastaim long testim, klinim pes bilong 'cable terminal sleeve' long daunim 'leak' bilong en. Yusim narapela 'insulated cable core' olsem wanpela 'shielding loop'. Konektim ol kondakta long tupela arere bilong dispela insulet kor i go long 'sleeve' o insulesen bilong insulet kor we ol i wok long testim wantaim 'flexible metal wire', na karamapim ol planti taim pastaim long konektim ol i go long ol 'shield terminals' bilong 'megohmmeter'.
6) Bihain long olgeta taim yu skelim strong bilong insulesen, rausim na graunim kebol. Sapos kebol i longpela, orait insulation kondisen i gutpela moa. Taim bilong putim graun i mas longpela, planti taim em i mas wanpela minit tasol.
DC 'standard voltage test' em i nambawan besik tes bilong 'cable project handover' o 'preventive testing', na tu em i nambawan as bilong painimaut sapos wanpela kebol lain i gutpela long wok. Ol kebol bilong opereting i mas kisim DC 'standard voltage' tes oltaim, na tu ol i mas skelim 'leakage current'.
