I-FAQ yomhloli wokumelana nokushisa

I-insulation resister tester ifaneleka ukulinganisa inani lokumelana lezinto ezihlukahlukene zokuvikela i-insulating kanye nokumelana nokushisa kwama-transformer, ama-motor, izintambo nemishini kagesi ukuze kuqinisekiswe ukuthi lezi zisetshenziswa, izinto zikagesi kanye nemigqa zisebenza esimweni esijwayelekile futhi zigwema izingozi ezifana nokushaqeka kukagesi. abalimele kanye nokulimala kwemishini.

Izinkinga ezijwayelekile ze-insulation tester zimi kanje:

1. Uma ukala ukumelana nomthwalo we-capacitive, buyini ubudlelwano phakathi kokukhishwayo kwe-short-circuit yamanje yesihloli sokumelana nokufakwa kwe-insulation kanye nedatha elinganisiwe, futhi ngani?

Umsinga ophumayo wesekethe emfishane yesihloli sokumelana nokufakwa kungabonisa ukumelana kwangaphakathi komthombo we-voltage ephezulu.

Izinto eziningi zokuhlola i-insulation ziyimithwalo ye-capacitive, njengezintambo ezinde, ama-motor anama-winding amaningi, ama-transformer, njll. Ngakho-ke, lapho into elinganisiwe inamandla, ekuqaleni kwenqubo yokuhlola, umthombo wamandla kagesi aphezulu kusihloli sokumelana nokushisa kufanele sishaje. i-capacitor ngokusebenzisa ukumelana kwayo kwangaphakathi, futhi kancane kancane ishaje i-voltage ekuphumeni okulinganiselwe inani le-voltage ephezulu yomhloli wokumelana nokufakwa.Uma inani le-capacitance lento elinganisiwe likhulu, noma ukumelana kwangaphakathi komthombo wamandla aphezulu kukhulu, inqubo yokushaja izothatha isikhathi eside.

Ubude bayo bunganqunywa umkhiqizo we-R no-C umthwalo (ngemizuzwana), okungukuthi t = R * C umthwalo.

Ngakho-ke, ngesikhathi sokuhlolwa, umthwalo we-capacitive udinga ukukhokhiswa ku-voltage yokuhlola, futhi isivinini sokushaja i-DV / DT silingana nesilinganiso sokushaja samanje I kanye ne-capacitance yokulayisha C. Leyo yi-DV / dt = I / C.

Ngakho-ke, okuncane ukumelana kwangaphakathi, kukhulu ukushaja kwamanje, futhi umphumela wokuhlola usheshe futhi uzinze.

2. Yini umsebenzi wokuphela kwethuluzi elithi “g”?Esimeni sokuhlola samandla kagesi aphezulu kanye nokumelana okuphezulu, kungani ithuluzi lixhunywe kutheminali ethi “g”?

Ukuphela kuka-"g" kwethuluzi kuyitheminali evikelayo, esetshenziselwa ukuqeda umthelela womswakamo nokungcola endaweni yokuhlola emiphumeleni yokulinganisa.Isiphetho esithi “g” sethuluzi siwukudlula amandla avuzayo endaweni ehloliwe, ukuze amandla avuzayo angadluli kumjikelezo wokuhlola wethuluzi, asuse iphutha elibangelwe ukuvuza kwamanje.Lapho kuhlolwa inani eliphezulu lokumelana, isiphetho se-G sidinga ukusetshenziswa.

Ngokuvamile, i-g-terminal ingabhekwa uma ingaphezulu kuka-10g.Nokho, lolu hlu lokumelana aluphelele.Ihlanzekile futhi yomile, futhi umthamo wento okufanele ilinganiswe incane, ngakho-ke ingakwazi ukuzinza ngaphandle kokulinganisa u-500g ekupheleni kwe-g;Endaweni emanzi nengcolile, ukumelana okuphansi nakho kudinga i-terminal.Ngokuqondile, uma kutholakala ukuthi umphumela unzima ukuzinza lapho kulinganiswa ukumelana okuphezulu, i-g-terminal ingacatshangelwa.Ukwengeza, kufanele kuqashelwe ukuthi itheminali evikelayo engu-G ayixhumekile kungqimba oluvikelayo, kodwa ixhunywe kusivikelo phakathi kuka-L no-E, noma ocingweni lwezintambo eziningi, hhayi kwezinye izintambo ezivivinywayo.

3. Kungani kudingekile ukukala hhayi kuphela ukumelana okumsulwa, kodwa futhi isilinganiso sokumunca kanye nenkomba ye-polarization lapho ulinganisa i-insulation?

I-PI iyinkomba ye-polarization, ebhekisela ekuqhathaniseni ukumelana nokufakwa kwe-insulation emaminithini angu-10 kanye nomzuzu owodwa ngesikhathi sokuhlolwa kokushisa;

I-DAR isilinganiso sokumuncwa kwe-dielectric, okubhekisela ekuqhathaniseni phakathi kokumelana nokushisa ngomzuzu owodwa kanye nalokho kuma-15s;

Esivivinyweni se-insulation, inani lokumelana nokufakwa ngesikhathi esithile alikwazi ukukhombisa ngokugcwele ikhwalithi yokusebenza kwe-insulation yento yokuhlola.Lokhu kungenxa yezizathu ezimbili ezilandelayo: ngakolunye uhlangothi, ukumelana nokufakwa kwe-insulation ye-insulation material efanayo kuncane lapho ivolumu inkulu, futhi inkulu lapho ivolumu incane.Ngakolunye uhlangothi, kukhona ukumuncwa kweshaja kanye nezinqubo ze-polarization ezintweni zokuvikela lapho kusetshenziswa amandla kagesi aphezulu.Ngakho-ke, uhlelo lwamandla ludinga ukuthi isilinganiso sokumuncwa (ama-r60 kuya ku-r15) kanye nenkomba ye-polarization (r10min ukuya ku-r1min) kufanele kukalwe ekuhlolweni kokufakwa kwe-insulation kwe-transformer eyinhloko, ikhebula, i-motor nezinye izikhathi eziningi, futhi isimo sokufakelwa singahlulelwa ngokuthi le datha.

4. Kungani amabhethri amaningana e-electronic insulation resistance tester engakhiqiza amandla kagesi aphezulu e-DC?Lokhu kusekelwe kumgomo wokuguqulwa kwe-DC.Ngemuva kokucutshungulwa kwesekethe ye-boost, i-voltage ephansi yokunikezela ikhuphukela ku-voltage ephezulu ephumayo ye-DC.Nakuba i-voltage ephezulu ekhiqizwayo iphakeme, amandla okukhiphayo mancane (amandla aphansi namanje amancane).

Qaphela: noma ngabe amandla amancane kakhulu, akunconywa ukuthinta i-probe yokuhlola, kusazoba nokuluma.