Mukugadzirwa kwemagetsi uye shanduko yehunyanzvi, vashandi vemagetsi kazhinji havazivi nzira yesainzi kusarudza nzvimbo yepakati-yetambo.Vane ruzivo vemagetsi vanozoverenga ikozvino zvichienderana nemagetsi mutoro uye sarudza nzvimbo yemuchinjikwa-chikamu chetambo zvakanyanya nyore;Mubatanidzwa unosarudza tambo yemuchinjikwa-chikamu zvichienderana nekugadzirisa kwemagetsi;Ndingati ruzivo rwavo runoshanda asi kwete zvesainzi.Pane zvakawanda zvakatumirwa paInternet, asi kazhinji hazvina kukwana zvakakwana uye zvakaoma kunzwisisa.Nhasi ini ndichagovera newe sainzi uye yakapusa nzira yekusarudza tambo muchinjiko-chikamu nzvimbo.Pane nzira ina dzezviitiko zvakasiyana.
Sarudza zvichienderana nekureba inobvumirwa kutakura kugona:
Kuti uve nechokwadi chekuchengetedza uye hupenyu hwesevhisi yetambo, tembiricha yetambo mushure mesimba-yakabatidzwa haifanirwe kudarika yakatarwa kwenguva yakareba inobvumidzwa tembiricha yekushanda, inova 70 madhigirii ePVC insulated tambo uye 90 madhigirii e-cross-linked polyethylene. insulated cables.Maererano nemutemo uyu, zviri nyore kwazvo kusarudza tambo nekutarisa kumusoro kwetafura.
Ipa mienzaniso:
The transformer simba refekitari i2500KVa uye magetsi ari 10KV.Kana tambo dze polyethylene insulated dzakachinjika dzichishandiswa kuaisa mubhiriji, chii chinofanira kunge chiri chikamu chepakati-chepakati chetambo?
Danho 1: Verenga yakayerwa ikozvino 2500/10.5/1.732=137A
Nhanho yechipiri: Tarisa bhuku rekusarudza tambo kuti uzive,
YJV-8.7/10KV-3X25 inotakura inokwana 120A
YJV-8.7/10KV-3X35 inotakura inokwana 140A
Danho rechitatu: Sarudza YJV-8.7/10KV-3X35 tambo ine simba rekutakura rinopfuura 137A, iyo inogona kuzadzisa zvinodiwa.Ongorora: Iyi nzira haitarise zvinodiwa zvekusimba kusimba uye kugadzikana kwekupisa.
Sarudza zvinoenderana nehupfumi hwazvino density:
Kuti ungonzwisisa huwandu hwehupfumi huripo, nzvimbo ye-cross-sectional yetambo inokanganisa mutsara wekutsvaga uye kurasikirwa kwemagetsi.Kuti uchengetedze mari, zvinotarisirwa kuti iyo cable cross-sectional nzvimbo idiki;kuitira kuderedza simba remagetsi kurasikirwa, zvinotarisirwa kuti cable cross-sectional area yakakura.Kubva pane zvataurwa pamusoro apa, sarudza zvinonzwisisika Nzvimbo ye-cross-sectional yetambo inonzi economic cross-sectional area, uye inopindirana ikozvino density inonzi economic current density.
Method: Zvinoenderana neawa ekushanda epagore emidziyo, tarisa kumusoro kwetafura kuti uwane hupfumi hwazvino density.Chikamu: A/mm2
Semuenzaniso: Iyo yakayerwa ikozvino yemidziyo ndeye 150A, uye yegore yekushanda nguva i8,000 maawa.Chii chinonzi cross-sectional area yecopper core cable?
Zvinoenderana netafura iri pamusoro C-1, zvinogona kuonekwa kuti kwemaawa 8000, huwandu hwehupfumi huri 1.75A/mm2.
S=150/1.75=85.7A
Mhedziso: Iyo cable cross-sectional nzvimbo isu tinogona kusarudza zvinoenderana netambo yakatarwa ndeye 95mm2
Sarudza zvinoenderana neiyo thermal kugadzikana coefficient:
Kana isu tikashandisa yekutanga uye yechipiri nzira yekusarudza tambo muchinjiko-chikamu nzvimbo, kana tambo yakareba kwazvo, pachava nekudonha kwemagetsi panguva yekushanda nekutanga.Iyo voltage padivi remidziyo yakadzikira pane imwe nhanho, izvo zvinokonzeresa kuti mudziyo upise.Maererano nezvinodiwa zve "Electrician's Manual", kudonha kwemagetsi emutsara we400V hakugoni kuva pasi pe7%, kureva, 380VX7% = 26.6V.Iyo voltage inodonhedza kuverenga formula (chete chete resistive voltage madonhwe anotariswa pano):
U=I×ρ×L/SS=I×ρ×L/U
U voltage inodonha Ini ndiyo yakayerwa ikozvino yemidziyo ρ conductor resistivity S ndiyo tambo yemuchinjikwa-chikamu L ndiyo kureba kwetambo.
Muenzaniso: Iyo yakayerwa ikozvino ye380V midziyo ndeye 150A, uchishandisa copper core cable (ρ yemhangura = 0.0175Ω.mm2/m), kudonha kwevoltage kunodiwa kuve isingasviki 7% (U=26.6V), kureba kwetambo 600 metres, chii tambo muchinjiko-chikamu nzvimbo S??
Zvinoenderana nechimiro S=I×ρ×L/U=150×0.0175×600/26.6=59.2mm2
Mhedziso: Iyo cable cross-sectional nzvimbo inosarudzwa se 70mm2.
Sarudza zvinoenderana neiyo thermal kugadzikana coefficient:
1. Apo 0.4KV tambo dzinodzivirirwa nemhepo inoshandura, tambo dzakawanda dzinogona kusangana nezvinodiwa zvekugadzikana kwekushisa uye hapana chikonzero chekutarisa maererano nenzira iyi.
2. Kune tambo dziri pamusoro pe6KV, mushure mekusarudza tambo yemuchinjikwa-sectional nzvimbo uchishandisa nzira iri pamusoro, unofanira kutarisa kana inosangana nezvinodiwa zvekugadzikana kwekushisa maererano nemaitiro anotevera.Kana zvisina kudaro, unofanirwa kusarudza nzvimbo yakakura yemuchinjikwa.
Formula: Smin=Id×√Ti/C
Pakati pavo, Ti ndiyo nguva yekutyora yedunhu redunhu, inotorwa se 0.25S, C ndiyo tambo yekudziya kugadzikana kweiyo coefficient, inotorwa se80, uye Id ndiyo yechitatu-chikamu chepfupi-yedunhu kukosha kweiyo system.
Muenzaniso: Maitiro ekusarudza tambo muchinjiko-chikamu nharaunda kana system pfupi-yedunhu ikozvino iri 18KA.
Smin=18000×√0.25/80=112.5mm2
Mhedziso: Kana iyo yenguva pfupi-yedunhu ikozvino inosvika 18KA, kunyangwe iyo yakatemerwa ikozvino yemidziyo iri diki, iyo cable cross-sectional nzvimbo haifanirwe kunge iri pasi pe120mm2.
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Nguva yekutumira: Sep-13-2023
