Okuqhubekayo ikhebula wamanje: umthwalo ubuchwepheshe

Lapho ikhebula umugqa voltage sisetshenziswa kubo asethwe predetermined umthwalo lamanje. Le mfuneko for ukusebenza lobuchwepheshe imithetho ehambisana ne-ukushisa ukwahlukanisa ngaphansi kwengcindezi okuqhubekayo. Uma ikhebula kuvunyelwe zamanje okuqhubekayo idlula ukubaluleka umkhawulo, kuzoba okweqile kanye kubhujiswa lesi ungqimba olubamba ukushisa kanye umonakalo kulandela. Ngakho-ke, umthwalo kuyakhethwa ukuze ukhiphe ingozi wokululazeka ezishisayo we ungqimba olubamba ukushisa.

Isizathu Ukushisa ikhebula

Inani ukushisa ngesikhathi ukusebenza ikhebula enikezwa:

- Q = mina ² RN W / cm, lapho mina - wamanje umthwalo, A; n - nenani imicu; R - Ukumelana, ohms.

Inkulumo engenhla kufanele kube, ayanda draw zamanje ukufakwa kagesi, ezixhunywe ikhebula, kulapho yokugcina uyabaselwa. Kulokhu-ke amandla kwashabalala lihambe ngemithambo ngesimo ukushisa, kuyinto esigcawini umthwalo.

Ukushabalalisa ukushisa kusukela ikhebula ukusebenza

Ukushisa ikhebula bayoqhubeka bekhula ngenxa yokuthi ukuthi ukushisa aye endaweni ethile. Kulokhu-ke inani incike umehluko phakathi ikhebuli izinga lokushisa imvelo. Ekugcineni lizama ukuzivumelanisa, kanye nezinga lokushisa elizosetshenziswa babashayeli babe unomphela.

Kanjani ukubala amandla avumelekile izinga lokushisa Ukushisa eziphilayo zamanje

Lapho umthwalo ukushisa iba ilingana nenani ukushisa kwashabalala yi ikhebula, imodi operation kuba esitebeleni:

- P = θ / ΣS = ( t _x - t _cp) / (ΣS), lapho θ - lokushisa umehluko phakathi umongo kanye nemvelo, ⁰ C; _w - t _cp - lokushisa umyela, ⁰ C; ΣS - RTD ikhebula.

Heat Uzoshiya ikhebula aba maningi kangcono conductivity medium. Okuqhubekayo ikhebula zamanje ibalwa kanje: Mina _DOP = √ ((t _ext - t _cp) / (RnΣS)), lapho t kuyinto _extra wahlala ovumelekile Ukushisa lokushisa (kuye ngokuthi uhlobo ikhebula).

izimo ukushisa

Okuhle kunakho konke ukuthi ukudluliswa ukushisa kwenzeka lapho ikhebula wokusemanzini. Uma sibekwa umhlaba, ukushisa ukususwa incike yokwakheka yokugcina nokuqukethwe umswakama. Ngo izibalo kujwayele ukuthatha le resistivity ka inhlabathi r = 120 ohms ∙ K / W, okuhambelana umhlabathi isihlabathi-ubumba nge okuqukethwe umswakama 12-14%. Ukuze uthole ukufundwa olunembile kubalulekile ukwazi indlela yokwakheka inhlabathi, kusukela ukumelana sehluka kakhulu futhi kumathebula. Kungenzeka ukunciphisa izinguquko ukubunjwa ngokugcwalisa emseleni ngekhebula futhi tamping ngokucophelela. isihlabathi ukungena nakwamanye amazwe futhi amatshe abe conductivity ezishisayo leliphasi kunaleyo ngobumba. Ngakho-ke, ikhebula ukugcwaliswa ukukhiqiza ubumba noma loam eliqukethe akukho slag, doti namadwala.

Ikhebula labetibambile emoyeni, has a ukudluliswa abampofu ukushisa. Kuba kubi uma sibekwa iziteshi ikhebula, lapho kukhona ezengeziwe emoyeni izingqimba, Ukushisa mutual izintambo eduze nezindonga ukumelana naye. Ukuze Ezimweni ezinjalo, zamanje umthwalo kuyakhethwa njengoba encane ngangokunokwenzeka.

Ukuqinisekisa izimo ezikahle lokushisa okusebenzela kuyo ikhebula umugqa umthwalo evumelekile yamanje izindlela ezimbili ukuze kutholakale: ukuphepha eside. Izimfanelo izintambo futhi ovumelekile lokushisa value ngesikhathi short circuit, lapho ukwahlukanisa iphepha 200 ⁰ C, futhi PVC - 120 ⁰ C.

Okuqhubekayo ikhebula lwamanje inhlukanozigaba ukuba ezishisayo ukumelana nokushisa umthamo yayo imvelo.

Kuyadingeka ukuba acabangele ukuthi ngokuhamba kwesikhathi kwandisa conductivity we ukwahlukanisa ikhebula ngenxa ezomile. Ukumelana inhlabathi 70% walo lonke inani ungaphakathi izibalo ekutholeni umthwalo Imininingwane.

Amathebula sokunquma zamanje evumelekile

ESL ukubala ngesandla, kunzima ukunquma kuvunyelwe okuqhubekayo ikhebula zamanje. PUE aqukethe etafuleni ekhethekile, ukuphi amagugu akhe izimo yokusebenza ehlukile. Ngezansi ebalisisiwe eliphelele elivumelekile idatha umthwalo lobehlukene zethusi umqhubi ashisa yayo 90 ⁰ C no-ambient 45 ⁰ C.

Esebenzisa izintambo, ogama izici zinikezwe kuThebula sokudlulisa futhi ukusabalalisa ugesi ukuze amanethiwekhi we voltage eqondile kushintshana futhi ukufaka umile. Abakwazi ukumelana eqine samabutho amakhulu futhi sibekwa phansi, ngaphandle, e ikhebula mapayipi. imicu Long lokushisa ovumelekile 70 ⁰ C, lapho i-isekhethi - hhayi ngaphezulu kuka-160 ⁰ C 4 imizuzwana. Kwimodi ephuthumayo kuvunyelwe Ukushisa buphele ingeqi 80 ⁰ C.

Izici babashayeli buhluka imikhawulo ububanzi, kuncike wokugubha, inani cores kanye neminye imingcele. Okuqhubekayo zamanje ikhebula VVG kuncike esigabeni cross, okuyinto kunqunywa inani kanye nohlobo eziphilayo. Ngokwesibonelo, esiphezulu endaweni Sectional ka ikhebula eyodwa 240 ^mm2, futhi-wire amahlanu - 50 mm ^2.

Okuqhubekayo sife AVVG ikhebula njengokusho kwesigaba kuchazwe okuyinto kancane kunenani VVG wire, njengoba eyenziwe aluminium. I kuvunyelwe izinga lokusebenza kanye eziphuthumayo ekusebenzeni zombili izinhlobo uyefana.

AVBbShv ikhebula inesimiso - ingasetshenziswa ezindaweni eziyingozi futhi pozhaproopasnyh ngenxa yokubakhona double zempi steel strip. Kuyinto kusandile e wokwakha. Okuqhubekayo sife AVBbShv ikhebula, kanye imikhiqizo odlule incike lokushisa, okuyinto kumele singeqi 75 ⁰ C., okuyinto kancane ngaphezulu. Kuchazwa kumathebula futhi kuncike esigabeni esiphambanweni indlela laying.

isiphetho

Ukuze Kuqondisa pripostoyannoy umthwalo akuyona ebilayo, kumelwe sithathe zamanje okuqhubekayo kusukela kumathebula ikhebula abale ukushabalalisa ukushisa endaweni ezungezile. Engalungile ukukhetha ikhebula asihole okweqile kanye kubhujiswa lesi ungqimba olubamba ukushisa, okuyinto Kwakuyohlanganisani ukuhluleka umkhiqizo ngaphambi kwesikhathi.