Homeliness, Hanga
Taura nāianei tonu: hangarau kawenga
A, no te tono ngaohiko raina taura te ki a ratou e whakaturia he nāianei kawenga tomu'a. Ko te whakaritenga mo te mahi hangarau o te ture e pā ana ki te mātao i raro i te pēhanga tonu te wera. Ki te nui taura whakaaetia nāianei tonu te uara rohe, i reira ka kia pukā me te whakangaromanga o te apa tuuraa me kino nunu'a. Na reira, tīpakohia te kawenga e kia rite ki te aukati i te ati o te kinonga waiariki o te apa tuuraa.
Ko te take i te taura whakawera
homai te nui o te wera hangaia i roto i te mahi o te taura e:
- Q = ahau 2 RN W / cm, te wahi ahau - te nāianei utanga, A; n - maha o whenu; R - Ātete, ohms.
kia te faaiteraa i runga, te teitei te Unuunu nāianei i runga i te tāutanga hiko, e kua hono ki te taura, te atu te muri, ko te wera. Ai he toreretanga ki te mana i roto i te uaua i roto i te puka o te wera, ko te tapawha o te kawenga.
Heat toreretanga i te taura mahi
Ka haere tonu whakawera o te taura ki te tupu e tika ana ki te meka e kua ki te haere vahi te wera. Ai tei te nui i runga i te rerekētanga i waenganui i te taura, me te pāmahana taiao. I te pae hopea i te taurite, me te pāmahana o te conductors hei pūmau.
Me pēhea te ki te tātai i te mana tīkina o te pāmahana o te whakawera ora o nāianei
A, no te riro rite ki te nui o te wera he toreretanga ki te taha o te taura te kawenga wera, riro pūmau te aratau mahi:
- P = θ / ΣS = ( t x - t CP) / (ΣS), i reira θ - pāmahana rerekētanga i waenganui i te matua me te taiao, 0 C; t w - t CP - pāmahana rōnaki, 0 C; ΣS - RTD taura.
ka waiho Heat te taura te nui te pai te kawe ia o te reo. tatau tonu taura nāianei te rite whai: DOP ahau = √ ((t ext - t CP) / (RnΣS)), kei hea t he noho he anō pāmahana whakawera tīkina (i runga i te momo o te taura rānei).
tikanga wera
Best o katoa, puta whakawhiti wera, ka ko te taura i roto i te wai. Ki te whakatakotoria ana i roto i te whenua, Tei tango wera i runga i te hanganga o te muri, me tona ihirangi makuku. I roto i te tātaitanga te tikanga tango i te resistivity o te r oneone = 120 ohms ∙ K / W, e hāngai ana ki te oneone one-paru ki te ihirangi makuku o 12-14%. Ki te whiwhi pānuitanga tika he mea nui ki te mohio te hanganga o te oneone, mai rerekē whānui te ātete, me te kei i roto i te papa. Ko taea ki te whakaiti i ngā rerekētanga i roto i te hanganga o te whakakī i te waikeri ki te te taura, me i āta tamping. onepu maiengi me te kirikiri i te kawe ia waiariki raro atu i taua o te paru. Na reira, hua taura whakakī paru one ranei kei roto kahore para, otaota me toka.
Taura tū i roto i te rangi, kua he whakawhitinga wera rawakore. riro te reira i kino ka whakatakotoria i roto i takere cable, ai reira he papa hau atu, whakawera tahi o taura tata me nga taiepa o te parenga. Hoki ngā take pēnei, tīpakohia te nāianei kawenga kei te rite iti rite taea.
Ki te whakarite tikanga pai pāmahana o mahi o te raina taura kawenga tīkina nāianei mo te aratau e rua ki te kia kitea: te haumaru, me te roa. Ko hoki nga āhuatanga o nga taura uara pāmahana tīkina i roto i te ara iahiko poto, ki nei te mātao pepa ko 200 0 C, me hoki pvc - 120 0 C.
Ko inversely hautanga ki tona resistance me te wera kaha ngāwhā o te taiao tonu taura o nāianei.
He mea tika ki te tango i ki pūkete e runga faarahi wa te kawe ia o te mātao taura tika ki maroke. ātete oneone Ko 70% o te uara tapeke kei roto i te tātai whakatau i te kawenga katoa.
Ripanga mō te whakatau i te nāianei tīkina
tatau ā ESL, he uaua ki te whakatau i te taura o nāianei tonu whakaaetia. Kei roto Pue tepu motuhake, kei hea he ana uara mō ngā āhuatanga whakahaere rerekē. Kei raro i te mōrahi whakaaetia raraunga kawenga tātai mō te ngā rahi o te parahi kaiwhakahaere i tona pāmahana o 90 0 C me ambient 45 0 C.
Na roto i te taura, e hoatu i roto i te te tuku Ripanga, ka tuwha hiko ki te kupenga o te ngaohiko hāngai, me te tauutuutu, me i roto i tāuta pahoho nei āhuatanga. e kore e taea e ratou te tu ope kurut nui, me te whakatakotoria i roto i te whenua, waho, i roto i aerodynamics taura. whenu roa tīkina pāmahana ko 70 0 C, a ka he poto-iahiko - e kore neke atu i 160 0 C mō te 4 hēkona. I roto i te aratau ohorere e kore e nui ake te whakawera ora whakaaetia 80 0 C.
tohu | hoahoa |
VVG | Ko te conductors - kaiwhakahaere-wāhanga ripeka o te parahi, me te 50 mm 2. Mātao - pvc. Ko te anga waho - pvc. |
AVVG | Ko te conductors - faatere o te wāhanga konumohe 50 mm 2. Mātao - pvc. Ko te anga waho - pvc. |
AVBbShv | Ko te conductors - kaiwhakahaere-wāhanga ripeka o te konumohe ki 120 mm 2. Mātao - pvc. Ko te patu - maitai rīpene korotā. |
rerekē āhuatanga whakahiko i roto i rohe whanui, i runga i te tohu, maha o otaota me ētahi atu tawhā rānei. Tei tonu VVG taura o nāianei i runga i te wāhanga ripeka, whakaritea nei e te nui, me te momo o te hunga ora. Hei tauira, te wāhi mōrahi motu o te taura kotahi o 240 mm2, a i roto i te-waea rima - 50 mm 2.
Motukore kawe taura AVVG rite wāhanga tautuhi i te mea paku nui atu te VVG waea, mai i te hanga i te reira o te konumohe. Te pāmahana whakahaere me te ohorere mahi whakaaetia o ngā momo e rua ko te taua.
AVBbShv taura he āhuatanga - taea te whakamahi i te reira i roto i ngā wāhi mōrearea, me te pozhaproopasnyh tika ki te aroaro o rua Unuhia patu maitai. Ko reira whānui i roto i te hanga. Motukore taura kawe AVBbShv, me te te hua o mua tei runga i te pāmahana, e kore e nui ake 75 0 C., i te mea ahua teitei. E parauhia te reira i roto i te tepu, me te tei runga i te wāhanga ripeka, me te tikanga o te whakapanga.
mutunga
Hei E arata'ii kore te pripostoyannoy kawenga overheated, me tiki e koe ake te nāianei tonu i nga tepu o te taura, ka tātai i te tohanga wera ki te taiao. Hē whiriwhiri taura ārahi ki pukā me te whakangaromanga o te apa tuuraa, e e uta e te kore hua ka werowero.
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