Nigute ushobora guhitamo umugozi uhuza ibice?

Mu gushushanya amashanyarazi no guhindura tekinike, abakozi b'amashanyarazi akenshi ntibazi guhitamo siyanse mubice byambukiranya insinga.Abanyamashanyarazi b'inararibonye bazabara ibigezweho bishingiye ku mutwaro w'amashanyarazi hanyuma bahitemo agace kambukiranya umugozi byoroshye;Ihuriro rihitamo umugozi uhuza ibice bishingiye kumashanyarazi;Navuga ko uburambe bwabo bufatika ariko ntabwo ari siyanse.Hano hari inyandiko nyinshi kuri enterineti, ariko akenshi ntabwo zuzuye bihagije kandi biragoye kubyumva.Uyu munsi nzabagezaho uburyo bwa siyansi kandi bworoshye bwo guhitamo umugozi uhuza ibice.Hariho uburyo bune mubihe bitandukanye.

Hitamo ukurikije ubushobozi bwigihe kirekire bwemewe bwo gutwara:

Kugirango umutekano urusheho kubaho nubuzima bwa serivisi ya kabili, ubushyuhe bwumugozi nyuma yumuriro ntibugomba kurenza ubushyuhe bwigihe kirekire bwemewe bwo gukora, ni dogere 70 kumashanyarazi ya PVC hamwe na dogere 90 kuri polyethylene ihuza insinga.Ukurikije iri hame, biroroshye cyane guhitamo umugozi ureba hejuru kumeza.

Tanga ingero:

Ubushobozi bwa transformateur bwuruganda ni 2500KVa naho amashanyarazi ni 10KV.Niba insinga zahujwe na polyethylene zikoreshwa mu kubishyira mu kiraro, ni ubuhe butumwa bwambukiranya insinga?

Intambwe ya 1: Kubara ibipimo byateganijwe 2500 / 10.5 / 1.732 = 137A

Intambwe ya 2: Reba igitabo cyatoranijwe kugirango umenye,

YJV-8.7 / 10KV-3X25 ubushobozi bwo gutwara ni 120A

YJV-8.7 / 10KV-3X35 ubushobozi bwo gutwara ni 140A

Intambwe ya 3: Hitamo umugozi wa YJV-8.7 / 10KV-3X35 ufite ubushobozi bwo gutwara burenze 137A, bushobora kuzuza ibisabwa.Icyitonderwa: Ubu buryo ntibureba ibisabwa kugirango imbaraga zihamye hamwe nubushyuhe bwumuriro.

Hitamo ukurikije ubukungu bwubu:

Kugirango twumve gusa ubucucike bwubukungu bugezweho, igice cyambukiranya umugozi kigira ingaruka kumirongo ishoramari no gutakaza ingufu z'amashanyarazi.Kugirango uzigame ishoramari, twizere ko umugozi uhuza ibice ari muto;mu rwego rwo kugabanya gutakaza ingufu z'amashanyarazi, hifujwe ko umugozi uhuza ibice ari munini.Ukurikije ibitekerezo byavuzwe haruguru, menya gushyira mu gaciro Igice cyambukiranya umugozi cyitwa agace k’ubukungu bwambukiranya imipaka, naho ubucucike buriho bwitwa ubukungu bw’ubukungu.

Uburyo: Ukurikije amasaha yumwaka yibikorwa, reba imbonerahamwe kugirango ubone ubukungu bwifashe neza.Igice: A / mm2

Kurugero: Ikigereranyo cyibikoresho byapimwe ni 150A, naho igihe cyo gukora cyumwaka ni amasaha 8000.Nibihe bice byambukiranya umugozi wumuringa wumuringa?

Ukurikije imbonerahamwe yavuzwe haruguru C-1, urashobora kubona ko mumasaha 8000, ubucucike bwubukungu ari 1.75A / mm2

S = 150 / 1.75 = 85.7A

Umwanzuro: Umugozi wambukiranya igice dushobora guhitamo dukurikije ibisobanuro bya kabili ni 95mm2

Hitamo ukurikije coefficente yumuriro:

Mugihe dukoresheje uburyo bwa mbere nubwa kabiri kugirango duhitemo umugozi wambukiranya igice, niba insinga ari ndende cyane, hazabaho kugabanuka kumashanyarazi mugihe cyo gutangira no gutangira.Umuvuduko kuruhande rwibikoresho uri munsi yurwego runaka, bizatera ibikoresho gushyuha.Ukurikije ibisabwa n '“Igitabo cy’amashanyarazi”, igabanuka rya voltage y'umurongo wa 400V ntirishobora kuba munsi ya 7%, ni ukuvuga 380VX7% = 26.6V.Amashanyarazi ya voltage yo kubara (gusa ibitonyanga bya voltage birwanya gusa)

U = I × ρ × L / SS = I × ρ × L / U.

U voltage igabanuka I nigipimo cyagenwe cyibikoresho ρ kiyobora irwanya S ni umugozi wambukiranya igice L ni uburebure bwa kabili

Urugero: Ikigereranyo cyibikoresho 380V ni 150A, ukoresheje umugozi wumuringa wumuringa (ρ wumuringa = 0.0175Ω.mm2 / m), igabanuka rya voltage risabwa kuba munsi ya 7% (U = 26.6V), uburebure bwumugozi ni Metero 600, ni ubuhe butumwa bwambukiranya igice S??

Ukurikije formula S = I × ρ × L / U = 150 × 0.0175 × 600 / 26.6 = 59.2mm2

Umwanzuro: Umugozi wambukiranya igice watoranijwe nka 70mm2.

Hitamo ukurikije coefficente yumuriro:

1. Iyo insinga 0.4KV irinzwe nuguhindura ikirere, insinga rusange zirashobora kuzuza ibisabwa kugirango ubushyuhe bwumuriro bushoboke kandi nta mpamvu yo kugenzura ukurikije ubu buryo.

2. Ku nsinga ziri hejuru ya 6KV, nyuma yo guhitamo umugozi wambukiranya igice ukoresheje uburyo bwavuzwe haruguru, ugomba kugenzura niba byujuje ibisabwa kugirango ubushyuhe bwumuriro bukurikizwe nuburyo bukurikira.Niba atari byo, ugomba guhitamo igice kinini cyambukiranya igice.

Inzira: Smin = Id × √Ti / C.

Muri byo, Ti ni igihe cyo kumena inzitizi zumuzunguruko, zifatwa nka 0.25S, C ni coefficient ya kabili yumuriro wumuriro, ifatwa nka 80, naho Id nicyiciro cyibice bitatu bigufi byumuzunguruko wa sisitemu.

Urugero: Nigute ushobora guhitamo umugozi wambukiranya igice mugihe sisitemu ngufi-yumuzunguruko ari 18KA.

Smin = 18000 × √0.25 / 80 = 112.5mm2

Umwanzuro: Niba sisitemu ya short-circuit yamashanyarazi igera kuri 18KA, kabone niyo igipimo cyagenwe cyibikoresho ari gito, agace kambukiranya kabili ntigomba kuba munsi ya 120mm2.

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