I-Neutral Grounding Resistor (NGR) licandelo elibalulekileyo kwiinkqubo zamandla ombane, ngakumbi kwiiprojekthi ze-transformer, apho inceda ukuphucula ukhuseleko nokuthembeka. I-NGR inciphisa ubukhulu beempazamo zamanzi kwimeko yempazamo yomhlaba, ngaloo ndlela ikhusela i-transformer kunye nezixhobo ezinxulumene nazo. Ukuqonda umsebenzi we-NGR kubalulekile kumashishini axhomekeke kwiinguqu kwiinkqubo zabo zokuhambisa umbane.
Imisebenzi engundoqo ye-NGR kwiiNkqubo zoTshintsho:
1.Ukunciphisa iFault yangoku
Kwiinkqubo zombane, iimpazamo zomhlaba (iisekethe ezimfutshane ukuya emhlabeni) ziphakathi kwezona mpazamo zixhaphakileyo. Ngaphandle kokubekwa phantsi komhlaba, impazamo ephantsi inokukhokelela kwimisinga ephezulu eyingozi, ubungozi bomonakalo wezixhobo kunye nokudala ubungozi kubasebenzi.
I-NGR idibaniswe phakathi kwendawo engathathi hlangothi ye-transformer kunye nomhlaba. Umsebenzi wayo ophambili kukukhawulela okwangoku ojikelezayo kwinkqubo ngexesha lesiphoso somhlaba ukuya kwinqanaba elikhuselekileyo nelilawulekayo. Ngokomzekelo, ukuba i-line-to-ground error iyenzeka, i-NGR inqanda ukuhamba kwangoku, ukukhusela zombini i-transformer kunye ne-downstream components.
2.Ukuthintela Ukonakala Kwezixhobo
Imisinga yempazamo engalawulekiyo inokukhokelela ekutshiseni, ukonakaliswa kwe-insulation, kunye nokungaphumeleli okukhulu kwee-transformers kunye nezinye izinto zombane. Ngokulawula impazamo yangoku, i-NGR inciphisa uxinzelelo kwinkqubo, ikhusela umonakalo wezixhobo.
Oku kubaluleke kakhulu kwiinkqubo eziphakathi ukuya kwi-high-voltage apho i-transformer ibaluleke kakhulu ekusasazeni amandla ngokufanelekileyo. I-NGR inqanda ukunyuka kwangoku okuphezulu ekulimazeni iindawo ezibuthathaka zangaphakathi ze-transformer, ngaloo ndlela yandisa ubomi besixhobo.
3.Ukuphucula ukuzinza kweNkqubo kunye noKhuseleko
Iinkqubo zokubeka phantsi ngee-NGRs ziphucula uzinzo lwenkqubo ngokuthintela ukuguquguquka okukhulu kwamandla ombane ngexesha leempazamo zomhlaba. Oku kuqinisekisa ukuba iindawo ezingachaphazelekiyo zenkqubo zinokuqhubeka nokusebenza, ngaloo ndlela kuncitshiswe ixesha lokuphumla.
Ukongeza, ukunciphisa impazamo yangoku kwixabiso elichazwe kwangaphambili kwandisa ukhuseleko lwabasebenzi. Imisinga yempazamo esezantsi inciphisa umngcipheko wokothuka kombane kwaye ithomalalise iingozi zomlilo ezinokuvela kwiimpazamo zamandla aphezulu emhlabeni.
4.Ukuququzelela uFundo lwempazamo kunye noLondolozo
Ngokulawula i-ground fault current, ii-NGRs zenza lula ukufumanisa iimpazamo. Ukudlula kwangoku kwi-resistor kunokulinganiswa, kubangele i-alamu okanye i-relays yokukhusela ukwazisa abaqhubi bephutha. Oku kunceda ekuhlaleni kunye nokuxilonga imiba ngokukhawuleza, ukuvumela ukulungiswa ngokukhawuleza kunye nokunciphisa ixesha lokuphumla.
Ukwanceda izinto eziluncedo kunye nemizi-mveliso ukunciphisa ukuphazamiseka kokusebenza, ngakumbi kwiziseko ezingundoqo ezifana nemizi-mveliso yokuvelisa umbane, iiprojekthi zamandla ahlaziyekayo, kunye nezibonelelo zemizi-mveliso.
5.Ukuthotyelwa kweeKhowudi zoMbane kunye neMigangatho
Izibonelelo ezininzi zemizi-mveliso kunye nezixhobo eziyimfuneko kufuneka zithobele iikhowudi zombane ezingqongqo kunye nemimiselo yokhuseleko, egunyazisa ukusetyenziswa kweenkqubo zokumisa umhlaba njenge-NGRs ukukhusela umonakalo wezixhobo kunye nokuqinisekisa ukhuseleko lwabasebenzi.
Izibonelelo zoncedo ze-NGRs zihlangabezana nale migangatho yolawulo ngokuqinisekisa ukuba ii-fault currents zihlala zikumanqanaba akhuselekileyo.
Iindidi zeeNGRs kunye nezicelo zazo
Ii-NGRs ziza ngeendlela ezahlukeneyo ngokuxhomekeke kumbane kunye namanqanaba akhoyo afunekayo. Ngokomzekelo, ixabiso elichasayo linokulungiswa ukuze kuqinisekiswe ukuba i-foult current inqunyelwe kwixabiso elithile, ngokuqhelekileyo kwi-10 ukuya kwi-1,000 amperes. Oku kubenza basebenze kuluhlu olubanzi lweenkqubo zesiguquli:
● I-high-voltage transformers kwizitishi ezisezantsi zizuza kwii-NGRs njengoko zinciphisa ii-currents ezinkulu zempazamo, zithintela umonakalo kwiziguquli zamandla amakhulu.
● Iziguquli zombane ophakathi kwimizi-mveliso zisebenzisa ii-NGRs ukukhusela iinkqubo zemveliso ekuphazamisekeni kombane okungalindelekanga ngenxa yeempazamo zomhlaba.
Ukuqukumbela
I-Neutral Grounding Resistor sisixhobo esibalulekileyo kwiiprojekthi ze-transformer, ukubonelela kokubili ukhuseleko kunye nokuzinza kwiinkqubo zombane. Ngokunciphisa impazamo yangoku, ukuthintela ukonakala kwezixhobo, kunye nokuphucula ukhuseleko, i-NGR licandelo eliphambili kumashishini axhomekeke kwiiguquli zokuhambisa amandla. Ukusetyenziswa kwayo ngokubanzi kwizicelo ezahlukeneyo, kubandakanywa nemizi-mveliso, izixhobo zombane, kunye neeprojekthi zamandla ahlaziyekayo, igxininisa ukubaluleka kwayo kubunjineli bombane bale mihla.
Ixesha lokuposa: Oct-10-2024