Earth Resistance Test

Igama elithi "ukumelana nomhlabathi" igama elingachazwanga kahle.Kwamanye amazinga (njengamazinga okuphepha ezinto ezisetshenziswayo zasendlini), kubhekiselwa ekuqineni phansi ngaphakathi kwempahla, kuyilapho kwamanye amazinga (njengakwikhodi yokuklama phansi), kubhekiselwe ekwazisweni kwawo wonke umshini ophansi.Lokhu esikhuluma ngakho kubhekisela ekuphikiseni ukusekela phansi ngaphakathi kwemishini, okungukuthi, ukumelana nokubekwa phansi (okubuye kubizwe ngokuthi ukumelana ne-grounding) ezindinganisweni ezijwayelekile zokuphepha komkhiqizo, okubonisa izingxenye ze-conductive eziveziwe zemishini kanye nokugxilwa kwayo yonke into.ukumelana phakathi kwamatheminali.Izinga elijwayelekile libeka ukuthi lokhu kumelana akufanele kube kukhulu kuno-0.1.

Ukumelana nokubekwa phansi kusho ukuthi lapho ukufakwa kwensimbi kagesi kwehluleka, izingxenye zensimbi ezifinyeleleka kalula njengendawo ebiyelwe kagesi zingashajwa, futhi isivikelo esinokwethenjelwa siyadingeka ukuze kuphephe umsebenzisi wento kagesi.Ukumelana ne-grounding kuyinkomba ebalulekile yokulinganisa ukuthembeka kokuvikelwa kokufakwa phansi kagesi.

Ukumelana nesisekelo kungalinganiswa ngomhloli wokumelana nesisekelo.Njengoba ukumelana komhlabathi kukuncane kakhulu, ngokuvamile emashumini ama-milliohms, kuyadingeka ukusebenzisa isilinganiso se-4-terminal ukuze kuqedwe ukumelana nokuxhumana futhi uthole imiphumela yokulinganisa enembile.Umhloli wokumelana nomhlabathi wakhiwe ukunikezwa kwamandla okuhlola, isifunda sokuhlola, inkomba kanye nesekhethi ye-alamu.Ukunikezwa kwamandla okuhlola kukhiqiza i-AC test yamanje engu-25A (noma 10A), futhi umjikelezo wokuhlola ukhulisa futhi uguqule isignali kagesi etholwe idivayisi ngaphansi kokuhlolwa, eboniswa yinkomba.Uma ukuqina okulinganiselwe ukumelana kukhulu kunevelu ye-alamu (0.1 noma 0.2), insimbi izokhala I-alamu Ekhanyayo.

Izinyathelo zokuphepha zokuhlola umhloli wokuqina ophansi olawulwa uhlelo

Uma isihloli sokumelana nokusekela phansi esilawulwa uhlelo sikala ukumelana nendawo, isiqeshana sokuhlola kufanele siboshelwe endaweni yokuxhuma ebusweni bengxenye yokuqondisa efinyelelekayo.Isikhathi sokuhlola akulula ukuba side kakhulu, ukuze ungashisi ukunikezwa kwamandla okuhlola.

Ukuze kulinganiswe ngokunembile ukumelana nokubekwa phansi, izintambo ezimbili ezizacile (izintambo zesampula ye-voltage) esiqeshaneni sokuhlola kufanele zikhishwe kutheminali kagesi yensimbi, esikhundleni sazo zifakwe ezinye izintambo ezimbili, futhi zixhunywe endaweni yokuxhumana phakathi kwento elinganisiwe neyamanje. isiqeshana sokuhlola ukuze uqede ngokuphelele umthelela wokumelana nokuxhumana nokuhlolwa.

Ukwengeza, umhloli wokumelana nesisekelo angakwazi futhi ukukala ukumelana nokuxhumana koxhumana nabo abahlukahlukene (othintana nabo) ngaphezu kokulinganisa ukumelana nomhlabathi.

I-Merrick Instruments' Isihloli Esihlelekayo Sokumelana Nomhlaba RK9930Ubuningi bokuhlola okwamanje ngu-30A;I-RK9930AIsilinganiso esiphezulu sokuhlola singu-40A;I-RK9930BUmthamo omkhulu ophumayo wamanje ngu-60A; Ngokuhlolwa kokumelana nesisekelo, ngaphansi kwemisinga ehlukene, umkhawulo ongaphezulu wokumelana nokuhlolwa ubalwa ngale ndlela elandelayo:

Uma ukumelana okubaliwe R kukhulu kunevelu enkulu yokumelana yomhloli, thatha inani eliphezulu lokumelana.

Yiziphi izinzuzo zomhloli wokumelana nomhlaba olawulwa uhlelo?

I-Earth Resistance Tester Ijeneretha ye-sine wave ilawulwa kakhulu yi-CPU ukuze ikhiqize igagasi elijwayelekile le-sine, futhi ukuhlanekezela kwayo kwe-waveform kungaphansi kuka-0.5%.I-sine wave evamile ithunyelwa kumjikelezo wesikhulisi samandla ukuze kukhuliswe amandla, bese eyamanje iphuma ngesiguquli esiphumayo samanje.Umphumela wamanje udlula ku-transformer yamanje.Amasampula, ukulungisa, ukuhlunga, nokuguqulwa kwe-A/D kuthunyelwa ku-CPU ukuze kuboniswe.Isampula ye-voltage, ukulungiswa, ukuhlunga, nokuguqulwa kwe-A/D kuthunyelwa ku-CPU, futhi inani lokumelana elilinganiselwe libalwa yi-CPU.

Isihloli Sokumelana Nomhlaba EsihlelekayoUma kuqhathaniswa nesihloli sokumelana nokuqina kohlobo lwe-voltage yendabuko, inezinzuzo ezilandelayo:

1. Umthombo ophumayo wamanje;setha okwamanje ku-25A, ngaphakathi kwebanga lokuhlola lalolu chungechunge lwabahloli, ngesikhathi sokuhlolwa, ukukhishwa kwamanje komhloli ngu-25A;okukhiphayo okwamanje akushintshi nomthwalo.

2. Amandla okukhiphayo wesihloli sokumelana nesisekelo esilawulwa uhlelo asithintwa amandla kagesi.Kusihloli sokumelana nokuqina kohlobo lwe-voltage yendabuko, uma ukunikezwa kwamandla kushintshashintsha, ukuphuma kwawo kwamanje kuzoguquguquka nakho;lo msebenzi womhloli wokumelana nokuqina olawulwa wuhlelo awukwazi ukufezwa ngesihloli sokumelana nohlobo lwe-voltage regulator.

3.Isihloli sokumelana nesisekelo se-RK7305inomsebenzi wokulinganisa isoftware;uma okukhiphayo kwamanje, ukubonisa ukumelana nokuhlola kwamanje nokuhlola komhloli kweqa ububanzi obunikezwe kumanuwali, umsebenzisi angalinganisa umhloli ngokwezinyathelo zokusebenza zemanuwali yomsebenzisi.RK9930 uchungechungeIngalinganiswa ngokuzenzakalelayo futhi ingaphazanyiswa indawo ezungezile

4.Imvamisa yamanje yokuphumayo iyahlukahluka; RK9930,I-RK9930A,I-RK9930BOkukhiphayo kwamanje komhloli wokumelana nokuphansi kunezimvamisa ezimbili ongakhetha kuzo: 50Hz/60Hz, ezingahlangabezana nezidingo zezingcezu zokuhlola ezihlukene.

Ukuhlolwa kokusebenza kokuphepha kwempahla yasendlini

1. Ukuhlolwa kokumelana ne-insulation

Ukumelana ne-insulation yezinto zikagesi zasendlini kungenye yezimpawu ezibalulekile zokuhlola ikhwalithi yokufakelwa kwazo.Ukumelana ne-insulation kusho ukumelana phakathi kwengxenye ephilayo yomshini wasendlini kanye nengxenye yensimbi engaphili eveziwe.Ngokuthuthuka okusheshayo kwemboni yemishini yasendlini kanye nokwanda okukhulu kokuthandwa kwemikhiqizo enjalo, ukuze kuqinisekiswe ukuphepha komuntu siqu kwabasebenzisi, izidingo zekhwalithi yokufakelwa kwezinto zasendlini ziya ngokuya ziba namandla.

Indlela yokusebenza yensimbi yokulinganisa ukumelana ne-insulation

1. Xhuma ukunikezwa kwamandla, vula iswishi yamandla, ukukhanya kwenkomba yamandla kuvuliwe;

2. Khetha i-voltage yokusebenza bese ucindezela inkinobho kagesi edingekayo;

3. Khetha inani le-alamu;

4. Khetha isikhathi sokuhlola (ochungechungeni lokubonisa lwedijithali, uhlobo lwesikhombi alunawo lo msebenzi);

5. Isikole esingapheli ();(Uchungechunge lwe-RK2681 lungasekela)

6. Ukuze uthole ukulinganiswa kwesikali esigcwele, xhuma isikhali sokulinganisa esinamathiselwe ekugcineni kokulinganisa, bese ulungisa i-potentiometer yesikali esigcwele ukuze isikhombisi sibheke esikalini esigcwele.

7. Xhuma into elinganisiwe ekugcineni kokulinganisa futhi ufunde ukumelana nokushisa.

Izinyathelo zokuphepha zokuhlola umhloli wokumelana ne-insulation

1. Kufanele kushiswe ngokugcwele ngaphambi kokulinganisa ukuze kukhishwe umswakama emshinini, ikakhulukazi esimweni sezulu esinomswakama ngenkathi yemvula eningizimu.

2. Lapho ukala ukumelana nokufakwa kwe-insulation kwezinto zikagesi ezisebenzayo, okokusebenza kufanele kukhishwe esimweni sokusebenza kuqala, futhi isilinganiso kufanele senziwe ngokushesha ngaphambi kokuba i-hotbed yemishini yehle ifinyelele izinga lokushisa elilingana negumbi ukuze kuvinjelwe inani elilinganisiwe ukuthi lingathinteki i-condensation endaweni ye-insulating.

3. Ithuluzi lokulinganisa i-elekthronikhi kufanele libe sesimweni sokungasebenzi, futhi isishintshi sensimbi kufanele sibe esimweni ukuze silinganise ukumelana kwayo nokufakwa, futhi amasekhethi noma izingxenye ezingahlobene nengxenye ehloliwe kufanele inqanyulwe ngesikhathi sokulinganisa. .

4. Ukuze ugweme ukuthi inani lokulinganisa lithinteke ngenxa yokungafinyeleli kahle kwentambo yokuxhuma yokulinganisa, ukufakwa kwe-quasi-connecting wire kufanele kuhlolwe njalo futhi kungasonteki ngokumelene nomunye.