Uma umthengi we-EPC engithumelela i-RFQ yokumisa isiteshi esincane, imigqa emibili yokuqala engiyifundayo iwumsinga wephutha kanye nokumelana nomhlabathi — hhayi ububanzi benduku. Lokho kuhleleka kubalulekile. I-IEEE Std 80 ayikutsheli ukuthi uthenge i-5/8 in noma i-3/4 ininduku yomhlabathi yesiteshi esincane; ikutshela ukuthi usinde ephutheni. Ububanzi nobude benduku kuhluka ekubalweni okuthathu: ukuhlolwa kokushisa ngokumelene nomsinga wephutha, ukuhlolwa kokumelana nomhlabathi, kanye nokuhlolwa kokuthinta nesinyathelo ngokumelene nongqimba olungaphezulu. Ezicini eziningi engizibukezayo, lokho kuwela kuizinduku zensimbi eziboshwe ngethusi ezinobubanzi obungu-14.2–19 mm kanye nobude obungu-2.4–3.0 m— kodwa indinganiso, hhayi ikhathalogi, kufanele inqume. Okulandelayo umsebenzi engiwenzayo kuzo zonke.
TL;DR — Impendulo Yosayizi Ngemisho Emine
- Ngephutha elingu-40 kA, i-1 s, i-equation ye-conductor-size ye-IEEE 80 idinga cishe i-141.9 mm² ye-cross-section yethusi — ngakho-ke ngisho nenduku yethu encane kunazo zonke engu-14.2 mm, ku-158.4 mm², idlula ukuhlolwa kokushisa ngomkhawulo osele.
- Ukuphinda kabili ubude benduku eqhutshwayo kusukela ku-1.5 m kuya ku-3.0 m kunciphisa ukumelana kwayo nomhlaba cishe ngo-44% enhlabathini efanayo, kuyilapho ukuphinda kabili ububanzi kusukela ku-14.2 mm kuya ku-25 mm kukuthengela cishe u-9% - ubude buyisivikelo esishukumisa ukumelana.
- Ingxenye ehlukanisiwe kuphela yamandla kagesi angena kugridi yakho: esimweni se-EasyPower (Bentley Systems) esibhaliwe, i-691 A kuphela yephutha le-22 kA elibangele ukwenyuka kwamandla omhlaba wegridi - isici esihlukanisiwe sishintsha ukubalwa ngakunye okungezansi.
- Ingqimba engaphezulu yamatshe aqoshiwe engu-150–200 mm iyingxenye yecala lokuphepha, hhayi ukuhlobisa: ukuyisusa kunciphisa i-touch voltage ebekezelelekayo esibonelweni esisodwa se-IEEE 80 esisebenzayo kusukela ku-1,314 V kuya cishe ku-222 V.
Lokho i-IEEE 80 Ecela Induku Yomhlabathi Engaphansi Kwesiteshi Ukuba Ikwenze Empeleni
I-IEEE Std 80 — Umhlahlandlela Wokuphepha Esiteshini Esingaphansi Kwe-AC, osanda kuqinisekiswa kabusha ohlelweni lwayo lwango-2013 — ukhona ukuphendula umbuzo owodwa: ngesikhathi sokuphazamiseka komhlaba, ingabe ama-voltage okuthinta kanye nezinyathelo umuntu angawabona ahlala ngaphansi kwemingcele ebekezelelekayo? Lonke izinga linciphisa ukuqhathanisa ama-mesh kanye nama-voltage ezinyathelo abaliwe ngokumelene nemingcele ebekezelelekayo encike esikhathini sokuphazamiseka, isisindo somzimba, kanye nongqimba olungaphezulu, njenge-isinyathelo ngesinyathelo i-IEEE 80 isuka eWind farm BoPkusho. Induku yakho yomhlabathi yesiteshi esincane ihlala ngaphakathi kwalolo chungechunge ezindaweni ezimbili: kumele ithwale ingxenye yayo yamandla okusebenza ngokushisa, futhi kumele isize ukugcina ukumelana kwegridi kuphansi ngokwanele ukuze ukuphakama kwamandla omhlaba (GPR) kuhlale kulawuleka.
Inombolo eyodwa ishintsha yonke into engezansi komfula, futhi abathengi bavame ukuyikhumbula:akuwona wonke ugesi wephutha ogeleza ungene kugridi yakho.Izintambo zesivikelo, ama-cable sheath, kanye nama-neutral athwala ingxenye emuva emthonjeni.Ngoba ingxenye ehlukanisiwe kuphela yamandla okusebenza ageleza kugridi yendawo, ukulinganisa yonke induku kanye nomqhubi kuya kumandla okusebenza alinganayo okuhlanganisa ithusi ngokuphindwe kabili kuya kahlanu.Incwadi yokuhlaziya isisekelo evela ku-Izinhlelo zeBentley (Isingeniso ku-Grounding Analysis, 2024)isebenza njengecala elingasoze lalibaleka: yephutha lesigaba-A esingu-22 kA, i-691 A kuphela eyathatha indlela eyadala i-GPR yesistimu yokumisa isisekelo — okusele kwabuya ngezihlangu zekhebula. Isiqondiso esivela ku-Umhlahlandlela wokuklama isisekelo sesiteshi esincane se-Keentel Engineeringibeka izici ezijwayelekile zokuhlukaniswa kwegridi ku-20-50% wamandla okusebenza aphelele, kuye ngokuthi zingaki izindlela zesivikelo nezindlela ezingathathi hlangothi eziphuma esiteshini.
Isinyathelo 1 — Qala Ngomhlabathi, Hhayi Ngenduku
Yonke inhlanganiso engiyibonile ihamba kabi yaqala ngekhathalogi esikhundleni sokuhlola ukumelana. Ukumelana nomhlabathi (ρ) kuyindlela enomthelela omkhulu kuyo yonke inqubo ye-IEEE 80, eqala cishe ku-10 Ω·m ebumbeni elimanzi kuya ku-10,000 Ω·m edwaleni elomile - ukusabalala okuphindwe kayinkulungwane, ngokwendlela yokuhamba kwe-Wind farm BoP. Incwadi yesandla ye-Bentley Systems inezela amaqiniso amabili asensimini: izindawo ezinokumelana okufanayo kunoma yikuphi ukujula kwangempela "azitholakali njalo," futhi ezindaweni lapho inhlabathi iqanda khona, ukumelana kuphakama kakhulu ngoba ukunyakaza kwe-ion kuyama. Inombolo ekopishwe etafuleni lezincwadi akuyona isilinganiso sendawo.
Lapho abathengi bengibuza ukuthi ngingayithola kanjani leyo nombolo, ngibakhomba indlela ye-IEEE Std 81′s Wenner four-pin: four pin at a signaling space a, current injected by outer pair, voltage read over the inner pair, and ρ = 2πaR. Incwadi yesandla kaBentley itusa ukusebenzisa i-pin spacing out to ascend the maximum size of the grid, ngoba test current bese i-probes deep as your grid is banzi — then the common the ground that your rods will live in it.Ngenxa yokuthi ukumelana nomhlaba kubekwe yikholomu yomhlabathi induku eyithintayo empeleni, induku engu-3.0 m eshayelwa engqimbeni ephansi yokumelana ingashaya induku engu-6.0 m ebhajwe endaweni engenhla eyomile.
Ngokwesilinganiso, isibonelo esisebenzayo se-Wind farm BoP sisebenzisa isiteshi sangempela se-wind farm esingu-110 kV: igridi engu-40 m × 65 m, isikhala se-conductor esingu-4–7 m, indawo yokungcwaba engu-0.5–0.8 m, kanye nezinduku eziqhutshwa ngethusi ezingaba ngu-3 m endaweni ezungezile kanye nemishini eyinhloko, enhlabathini engu-50–150 Ω·m.
Isinyathelo 2 — Ukuhlolwa Kokushisa: Ingabe Induku Izosinda Emthonjeni Wephutha?
I-equation yokuqala yosayizi ku-IEEE 80 ayinalutho oluphathelene nokumelana. Ibuza ukuthi ngabe umqhubi angakwazi yini ukumunca ukushisa kwephutha ngaphandle kokulifaka noma ukuhlanganisa: A = I × √t₊ / K, lapho i-constant yezinto ezibonakalayo i-K igoqa khona kumthamo wokushisa, ukumelana, kanye nokushisa okuphezulu okuvunyelwe kwensimbi. Kuthusi elifakwe i-anneal, ama-constant eThebula 1 ejwayelekile ayi-coefficient yokushisa yokumelana engu-0.00393 /°C, ukumelana okungu-1.72 μΩ·cm, umthamo wokushisa ongu-3.42 J/cm³/°C, kanye nokushisa okuphezulu okungu-1,083 °C — indawo yokuncibilika kwethusi, njengoba kuboniswe ku-Wind farm BoP walkthrough. Sebenzisa izinombolo ngesikhathi sokuhlanza esijwayelekile esingu-1 s kanye ne-ambient engu-40 °C, futhi isigaba esidingekayo sisebenza cishe ku-7.0 kcmil nge-kA ngayinye yamandla okushisa — cishe u-3.55 mm² nge-kA ngayinye.
Nakhu lokho kusho ukuthini uma ngigijimaubukhulu benduku yomhlabathi yephuthakumthengi:
| Iphutha lomklamo wamanje endukwini | Isigaba esidingekayo | Induku engu-14.2 mm (158.4 mm²) | Induku engu-17.2 mm (232.4 mm²) |
|---|---|---|---|
| 20 kA | 70.9 mm² | Amaphasi, imajini engu-2.2 × | Amaphasi, imajini engu-3.3 × |
| 25 kA | 88.7 mm² | Amaphasi, imajini engu-1.8 × | Amaphasi, imajini engu-2.6× |
| 30 kA | 106.4 mm² | Amaphasi, imajini engu-1.5 × | Amaphasi, imajini engu-2.2 × |
| 40 kA (egcina ukwakheka, akukho khredithi ehlukanisiwe) | 141.9 mm² | Amaphasi, imajini engu-1.1 × | Amaphasi, imajini engu-1.6 × |
Ngisebenzisa ikholomu elondolozayo — i-full fault current, ayikho i-split credit — ngoba umthengi olingana nayo angavikela imininingwane kunoma yikuphi ukubuyekezwa komklamo.Ngenxa yokuthi induku egridini enezinduku eziningi ithwala kuphela isabelo sayo sendawo samandla egridi, kanti igridi ngokwayo ibona kuphela ingxenye ehlukanisiwe yephutha eliphelele, induku eboshwe ngethusi engu-14.2 mm esinda ekuhlolweni okugcwele kwe-40 kA ithwala isici esikhulu sokuphepha emhlabeni wangempela.Yingakho, lapho ngifunda i-EPC spec egxuma iqonde ngqo kuma-rod angu-25 mm “ngokusebenzisa i-fault current,” ngibuza ukuthi yisiphi isikhathi sokuhlanza kanye ne-split factor abayicabangele — impendulo ivame ukuba “akukho.”
Isexwayiso esisodwa sokushisa siyasinda ekuthengweni - ijazi. Izinduku ezibhalwe ku-UL 467 zinongqimba lwethusi okungenani oluyi-0.254 mm (10 mil), futhi ngiphatha lokho njengophansi: umugqa wethu ubamba u-≥0.254 mm ngobumsulwa obuyi-≥99.95%, okuqinisekiswa ukuhlolwa kohlobo lwe-CEPRI.
Isinyathelo 3 — Ubude vs. Ububanzi: Yisiphi i-Lever Esishukumisa Ngempela Ukumelana Negridi?
Uma ukuhlolwa kokushisa sekuphelile,Ukufakwa phansi kwe-IEEE 80iba yinkinga yokumelana. Ngenduku eyodwa eqondile enhlabathini efanayo, isibalo sokumelana sendinganiso yi-R = ρ/(2πL) × [ln(8L/d) − 1], enobude benduku u-L ngamamitha kanye nobubanzi u-d ngamamitha. I-logarithm iyindaba yonke: ubude buqhuba kokubili imigomo eqondile kanye nelogi; ububanzi buyilogi kuphela. Uma ngiyisebenzisa ku-ρ = 100 Ω·m ngenduku yethu engu-17.2 mm, ngithola u-70.6 Ω ku-1.2 m, u-50.7 Ω ku-1.8 m, u-39.9 Ω ku-2.4 m, kanye no-33.1 Ω ku-3.0 m.
| Ushintsho olwenziwe endukwini | Ukucushwa | Ukumelana nomhlaba | Ukunciphisa vs. isisekelo | Umshayeli wezindleko |
|---|---|---|---|---|
| Ikesi eliyisisekelo | 17.2 mm × 1.5 m | 58.9 Ω | — | — |
| Ubude obuphindwe kabili | 17.2 mm × 3.0 m | 33.1 Ω | ≈ 44% ngaphansi | Isisindo sethusi nensimbi ×2 |
| Phinda kabili ububanzi (L = 2.4 m) | 14.2 mm → 25 mm | 41.2 → 37.4 Ω | ≈ 9% ngaphansi | Isisindo sethusi nensimbi ×3 |
| Engeza izinduku ku-≥ 1 × ubude besikhala | Izinduku ezimbili ezingama-17.2 mm × 2.4 m | ≈ 40 → 22–26 Ω | ≈ 35–45% ngaphansi | Izinduku + izihlanganisi + umsebenzi wokushayela |
| Shayela uye engqimbeni engezansi yomhlabathi | Ngokuhlolwa kwenhlabathi okunezingqimba | Okuqondene nesayithi | Ngokuvamile isivikelo esikhulu kunazo zonke | Izinduku ezijulile, ezinwebekayo ezifakwe intambo |
Ucwaningo lokuqhathanisa lwango-2025 kuIsayensi Esetshenziswayo ye-MDPI (ukulinganiswa kwe-finite-element plus field kuzo zonke izinsiza ze-400 V, 10 kV, kanye ne-35 kV)Ifika esiphethweni esifanayo engisinika abathengi, kusukela ohlangothini lokulingisa: enhlabathini enokumelana okuphezulu, izinduku eziqondile eziqhutshwa ngokujulile zidlula ukwakheka okungajulile ngoba zifinyelela ukuxhumana okukhulu komhlaba, kuyilapho amagridi avundlile enza ukuphakamisa okunzima ekuhlakazekeni kwamanje kwephutha egcekeni lesiteshi esincane. Ucwaningo luphinde lubhale ngokunciphisa okwengeziwe kokumelana okuvela ekugcwaliseni okuqhutshwayo njenge-bentonite noma ukhonkolo oqhutshwayo ozungeze i-electrode - i-lever esemthethweni lapho ungakwazi ukushayela ujule.
Ngenxa yokuthi ukumelana nomhlaba kwehla ngokwe-logarithmic, induku yokuqala eqhutshwayo engu-3.0 m yenza iningi lomsebenzi, futhi induku yomhlabathi esetshenziswayo cishe njalo “ububanzi obujwayelekile, ubude obungashayelwa” kunokuba “ububanzi obuphezulu, ubude obujwayelekile.”Ububanzi busaqhubeka nokuba khona ezindaweni ezintathu engizihlola kuzo zonke izici: ukuqina kokushayela enhlabathini eqinile noma enamatshe (induku engu-16-19 mm iphambuka ngaphansi kwengu-14.2 mm kudrayivu engu-3.0 m), ubuqotho bentambo ekuhlanganiseni ukuze kuqhutshwe ukugijima okunwebekayo, kanye nemvume yokugqwala enhlabathini enamandla eminyakeni engu-40-50 yokuphila komklamo.
Isikali Sokumelana Nenduku Eyodwa (isibalo senhlabathi esifanayo se-IEEE 80)
R = ρ/(2πL) × [ln(8L/d) − 1]. Usayizi wokuqala kuphela — imiklamo yokugcina idinga inqubo ephelele yegridi ye-IEEE 80 ngemodeli yakho yenhlabathi elinganisiwe.
Isinyathelo 4 — Ukubalwa Kwezinduku, Isikhala, kanye Nokuthi Izinduku Ziya Kuphi Ngempela
Kuzo zonke izakhiwo engizibukezayo, igridi yesiteshi esincane iba yi-conductor kuqala bese kuthi induku ilandele. Ku-geometry yereferensi ye-Wind farm BoP — 40 m × 65 m, isikhala se-conductor esingu-4–7 m, ukungcwaba okungu-0.5–0.8 m — izinduku eziqhutshwayo ezingaba ngu-3 m ziya endaweni ezungezile kanye nemishini eyinhloko, zenza umsebenzi ophindwe kabili: ukushefa ukumelana kwegridi enhlabathini ejulile futhi kubambe amakhona lapho i-mesh voltage iphakama khona. Umthetho wami wesikhala kubathengi uhlala ulondoloza futhi ulula: Ngigcina izinduku eziseduze okungenani ubude benduku eyodwa, ngoba izinduku eziqhutshwayo ziseduze kunobude bazo zabelana ngamagobolondo okumelana ahambisanayo kanye nethusi elichithiwe. Umhlahlandlela wokuklama we-Keentel Engineering wenza iphuzu elifanayo le-perimeter-first futhi uphawula ukuthi lapho inhlabathi engajulile yenqaba ukubambisana, imithombo eqhutshwayo ejulile ingasabalalisa iningi lamandla ephutha — icala elilodwa elibhalwe phansi elilicaphuna lisunduze u-62% wokusabalala kwamanje ku-electrode ejulile.
Ngivala yonke isibuyekezo se-grid spec ngesendlalelo sobuso. Izibalo ze-IEEE 80's tolerable-voltage zinikeza isendlalelo sedwala elichotshoziwe ngoba ukumelana kwaso okungu-2,000–10,000 Ω·m kuphakathi kwamabhuzu esisebenzi nomhlabathi wendabuko; amanani ajwayelekile okuklama agijima ku-3,000–5,000 Ω·m ngobukhulu obungu-0.1–0.2 m. Isibonelo esisebenzayo se-Wind farm BoP silinganisa okusengozini: susa i-gravel kanye ne-touch voltage ebekezelelekayo kuleyo yadi engu-110 kV iwela kusuka ku-1,314 V iye cishe ku-222 V — ngaphansi kwe-voltage ye-mesh engu-880 V ebalwe, okusho ukuthi igceke liyahluleka.Ngenxa yokuthi ungqimba lwedwala luphindaphinda umkhawulo obekezelelekayo kaningana ngenkathi igridi ibamba i-voltage yangempela phansi, ukucaciswa kwenduku yomhlabathi yesiteshi esincane akuqedi kuze kube yilapho othile eba ne-spec yamatshe.
Lokho Esikukhiqizayo Ngalawo Manani
Ubunjiniyela bunquma ububanzi nobude; umsebenzi wami ukuqinisekisa ukuthi induku efikayo ihambisana neshidi lemininingwane. Efektri yethu i-Xinchang ngiqondisa uhlangothi lokuthumela ngaphandle lomugqa okhiqizayoizinduku zokufaka insimbi eziboshiwe zethusingobubanzi obungu-14.2–25 mm kanye nobude obungu-1.2–3.0 m, ngesendlalelo sethusi esifakwe ngogesi esingu-≥0.254 mm ngobumsulwa obungu-≥99.95% phezu kwensimbi engaphansi kwekhabhoni (~0.15% C). Oomatshini babalulekile ekushayeleni okungu-3.0 m: sibamba amandla okudonsa angu-≥580 N/mm², ukunemba ngaphakathi kuka-1 mm/m, kanye ne-engeli engu-27.5° ± 2.5° iphuzu, futhi yonke inqwaba isinda ekugobeni okungu-90° ku-radius engu-100 mm ngaphandle kokuphuka kwethusi noma ukuxebuka - imodi yokuhluleka ebulala izinduku ezishibhile emhlabathini onamatshe.
Ukuze uthole ukugijima okujulile okunwebekayo — ikhambi locwaningo lwe-MDPI lokumelana okuphezulu — yethuizinduku zokufaka insimbi yobumba eziboshwe ngethusi kagesihlanganisa izingxenye ezingu-1.2 m zibe ama-electrode angu-3-6 m ngaphandle kokulahlekelwa ubuqotho bejakethi ejoyintini. Lapho i-spec idinga umzila ohlukile wokufaka iplati, i-induku yomhlabathi embozwe ngethusiububanzi bumboza ifasitela elinobubanzi obufanayo, kanye nefasitela eligcweleisigaba senduku yomhlabathiibala yonke inhlanganisela yobude nobubanzi esinayo esitokweni. Umthamo wezingcezu ezingama-50,000 ngenyanga, kuthunyelwa i-EXW, i-FOB, i-CIF, noma i-DDU kusuka eNingbo noma eShanghai.
Zonke izicelo ezingenhla zisekelwa ngamaphepha: uhlelo lwefektri lwe-ISO 9001, uhlu lwe-UL 467, kanye nombiko wokuhlola uhlobo lwe-CEPRI ohlanganisa ukujiya kwesendlalelo sethusi, ukunamathela, kanye nokusebenza kokugoba. I-QC yethu yangaphakathi isebenzisa amasango ayisithupha kusukela ensimbi engenayo kuya ekuthunyelweni kwangaphambili, futhi amarekhodi e-batch ayisethi yedatha ngemuva kwezinombolo engizicaphuna kulesi sihloko. Uma imininingwane yakho idinga ukuphambuka — ubude obungajwayelekile, amajakethi amakhulu, ukuhlolwa kofakazi beqembu lesithathu — leyo ingxoxo esinayo masonto onke, futhi ungayiqala ku-ikhasi lokuxhumana.
Ukwenqatshwa kwe-RFQ Ezintathu Engikubuyisela Kubathengi
Okubi kakhulu okushiwoyo yi-split factor. Ama-RFQ amaningi engiwavulayo asho ukuthi i-fault current — ake sithi i-40 kA — futhi akukho okunye, okuphoqa yonke intonga kanye nomqhubi ukuthi kube nosayizi sengathi i-40 kA ephelele ingena kugridi. Akwenzi lokho.Ngenxa yokuthi izintambo zesivikelo kanye nezigxobo zekhebula zithwala iningi lamandla kagesi angasebenzi emuva emthonjeni, isici esibhalwe ngaphandle kwesici sokuhlukanisa samanje sakha ithusi eliphindwe kabili kuya kahlanu kunalelo igceke elizolinika amandla.— Icala elisebenzayo le-Bentley Systems lifaka izinombolo zangempela kulo: i-22 kA yephutha, i-691 A kugridi. Ngakho-ke impendulo yami yokuqala kunoma iyiphi i-RFQ akuyona ikhotheshini; kuyisicelo sezinombolo ezine: i-3I₀, isilinganiso se-X/R, izikhathi zokuhlanza eziyinhloko nezesipele, kanye nesici sokuhlukaniswa noma ukucushwa kwentambo yesihlangu okudingekayo ukuze kubalwe. Abathengi abanazo bathola i-defensible spec; abathengi abangatholi ikholomu elondolozayo, futhi bayikhokhela ngethusi.
Okwesibili okushiwoyo imodeli yenhlabathi ehlotshiswe njengenani lenhlabathi. Umugqa ofundeka ngokuthi “ukumelana nenhlabathi: 100 Ω·m” ungitshela ukuthi othile uvule incwadi yesifundo, ngoba incwadi yesandla kaBentley icacile ukuthi izindawo ezimelana ngokufanayo azitholakali njalo, futhi inhlabathi yasebusika eqandisiwe isunduza ukumelana kwayo phezulu kakhulu. Ngaphambi kokuba ngizibophezele ekufinyeleleni ubude benduku, ngicela izindlela zokudlula ze-Wenner ezine-pin — izindawo eziningana, ezihlukanisa i-pin ziye ku-diagonal ende kunazo zonke yegridi, cishe amamitha angu-76 egcekeni elingamamitha angu-40 × 65. Ucwaningo lunquma ukuthi udinga izinduku ezingamamitha angu-2.4, izinduku ezingamamitha angu-3.0, noma izintambo ezinentambo ezinwebekayo zibe ungqimba olujulile; ikhathalogi ayikwazi.
Okwesithathu okushiywe ngaphandle yizinto ezimbili zokuphepha okungekho muntu onazo. Enye indlela yokuxhuma: yishiye ingacacisiwe bese unkontileka efaka noma yiziphi izikhonkwane ezikulori, bese ijoyinti elilodwa elibolile liba yindawo eshisayo ukubalwa kwe-IEEE 80 okungakaze kucatshangelwe - yingakho ngibhala ukushisela kwe-exothermic emgqeni ofanayo we-RFQ njengenduku. Enye ungqimba lwedwala elichotshoziwe, oluthathwa njengokuhlobisa insimu ngenkathi izibalo ze-tolerable-voltage ziluphatha njengemishini yokuphepha: lukhiphe bese isibonelo se-110 kV esisebenzayo sehla sisuka ku-1,314 V esibekezelelekayo siye cishe ku-222 V ngokumelene ne-voltage ye-880 V mesh. Ngaphandle kwalezi ezintathu, i-RFQ isadinga izinto zayo zomugqa ezijwayelekile - ububanzi, ubude, ungqimba lwethusi ≥0.254 mm, ukuthamba ≥580 N/mm² - kanye nezingqimba ezintathu zobufakazi bokuhlolwa obuhlanganiswe ku-FAQ engezansi.
imibuzo ejwayelekile ukubuzwa
Iyiphi induku yomhlabathi yesiteshi esincane enobubanzi lapho iningi lemininingwane ye-EPC lifika khona?
Ezicacisweni engizibukezayo, ububanzi obungu-16-19 mm (5/8–3/4 in) obunobude obungu-2.4–3.0 m bumboza iningi leziteshi zokudlulisa nokusabalalisa. Izibalo zokushisa azivamile ukuphoqa ububanzi - induku engu-14.2 mm isivele idlula ukuhlolwa okungu-40 kA, i-1 s - ngakho abashayeli bashayela ukuqina, usayizi wentambo yokuxhuma, kanye nemvume yokugqwala. Ngicaphuna u-17.2 mm njengokuzenzakalelayo - isula isigaba sentambo esingu-5/8 futhi ishayela iqonde ku-3.0 m.
Ingabe induku ende noma ejiyile ingcono ekunciphiseni ukumelana kwegridi?
Kude, cishe njalo — ubude obuphindwe kabili kusukela ku-1.5 m kuya ku-3.0 m bunciphisa ukumelana cishe ngo-44% enhlabathini efanayo engu-100 Ω·m, kuyilapho ububanzi obuphindwe kabili kusukela ku-14.2 mm kuya ku-25 mm bunciphisa cishe u-9%. Lapho idwala likhawulela ukujula, engeza izinduku esikhaleni sobude benduku eyodwa noma sebenzisa i-bentonite backfill, okubonisa ukuthi ucwaningo lwe-MDPI Applied Sciences luka-2025 lusanikeza ukunciphisa okunengqondo.
Ingakanani i-fault current egeleza ngempela kugridi yomhlabathi?
Ingxenye ehlukanisiwe kuphela — ngokuvamile ingu-20–50% ngokwesiqondiso sokuklama se-Keentel Engineering, futhi ngezinye izikhathi incane kakhulu. Incwadi yokuhlaziya i-grounding ye-Bentley Systems isebenza ngephutha le-22 kA phase-A lapho i-691 A kuphela eyayigeleza endleleni ikhiqiza ukuphakama kwamandla omhlaba wegridi; izintambo zesivikelo kanye nama-cable sheaths kwathwala okusele. Yingakho i-split factor evela ocwaningweni lwe-grounding ifaneleka ku-RFQ yakho ngaphambi kokuba kuxoxwe nganoma yiluphi ububanzi benduku.
Ingabe i-IEEE 80 idinga izinduku zensimbi eziboshwe ngethusi, noma ithusi eliqinile?
I-IEEE 80 isekelwe ekusebenzeni — ibeka imigomo yokushisa, ukumelana, kanye nokuthinta/isinyathelo, hhayi into yomkhiqizo. Insimbi eboshwe ngethusi yaba yinduku yomhlabathi ezenzakalelayo yesiteshi esincane ngoba umongo wensimbi unikeza amandla okushayela ukufakwa okungu-2.4–3.0 m kuyilapho ijakethi yethusi ithwala amandla kagesi futhi imelana nokugqwala; i-UL 467 yenza kube semthethweni ijakethi elincane elingu-0.254 mm. Ithusi eliqinile lishayela kabi enhlabathini eqinile; insimbi ehlanganisiwe ilahlekelwa yimpikiswano yokugqwala.
Izinduku kufanele zidonswe zijule kangakanani, futhi kufanele ziqhelelane kangakanani?
Ngokwemininingwane engiyivumayo, umkhuba ojwayelekile yizinduku ezingamamitha angu-2.4–3.0 ngaphansi kwegridi egqitshwe ngamamitha angu-0.5–0.8 ukujula, nezinduku zisemngceleni nasezindaweni zemishini ebalulekile, zihlukaniswe okungenani ubude benduku eyodwa ukuze amagobolondo azo okumelana angahlangani. Lapho ucwaningo lwenhlabathi lubonisa ungqimba olungaphezulu olumelana nokujula kokuhambisa umoya, izinduku ezinentambo ezinwebekayo zikuvumela ukuthi ushayele ngamamitha angu-6 noma ngaphezulu - ucwaningo lokuqhathanisa lwe-MDPI luqinisekisa ukuthi izinduku eziqhutshwa ngokujulile ziyisakhiwo esiqine kakhulu enhlabathini emelana nokukhuphuka.
Ingabe izinduku ezigayiwe zodwa zingalungisa indawo ekwazi ukumelana namandla aphezulu?
Akunjalo ngaso sonke isikhathi, futhi ukwethembeka lapha konga imali. Lapho izibalo zomhlabathi ofanayo zingaphumeleli, isitebhisi esiqinisekisiwe yilesi: ama-electrode aqhutshwa ngokujulile, izinduku eziningi endaweni efanele, i-conductive backfill (i-bentonite noma i-conductive concrete, ebhalwe ocwaningweni lwe-MDPI), futhi ekugcineni imithombo yomhlabathi ejulile - uKeentel ucaphuna icala lapho i-electrode ejulile yayithwala u-62% wokuhlakazeka kwamanje kwephutha. Izinduku ziyi-first lever eshibhile kakhulu, kodwa imodeli yomhlabathi kufanele ikhethe i-rung.
Yimaphi amadokhumenti okuhlola okufanele ngiwafune kumhlinzeki wenduku yokugaya?
Izendlalelo ezintathu: uhlu (UL 467 noma olulinganayo) olufakazela isigaba somkhiqizo; ukuhlolwa kohlobo olugunyaziwe - olwethu yi-CEPRI - oluhlanganisa ukujiya kwesendlalelo sethusi, ukunamathela, kanye nokugoba; kanye namarekhodi ezinga le-batch abonisa ithusi ≥0.254 mm, ukuthambekela ≥580 N/mm², kanye nokugoba okungu-90° ku-radius engu-100 mm ngaphandle kokuxebuka. Uma umhlinzeki engakwazi ukukhiqiza konke lokhu okuthathu, awunabo ubufakazi bokuthi induku yilokho okushiwo yi-datasheet.
Ukulinganisa igridi yesiteshi esincane uma kuqhathaniswa ne-IEEE 80 njengamanje?
Ngithumelele i-fault current yakho, isikhathi sokuhlanza, i-split factor, kanye ne-soil model — Ngizobuya phakathi nosuku olulodwa lokusebenza nezincomo zobude bobubanzi, izibalo ezingemuva kwayo, kanye nekhotheshini.Qala ingxoxo ekhasini lethu lokuxhumana →
Ngiphatha ukuthunyelwa kwamanye amazwe komoya ophansi kanye nokuvikela umbani okuvela efektri yethu i-Xinchang, ngibuyekeza imininingwane yesiteshi esincane se-IEEE 80 nge-EPC kanye nabathengi bezinsizakusebenza emazweni angaphezu kuka-40.
Isikhathi sokuthunyelwe: Agasti-06-2026