Transformer Dyn11 kev twb kev txuas: high-voltage sab daim duab peb sab, low-voltage sab hnub qub thiab nruab nrab, high-voltage thiab low-voltage muaj ib theem sib txawv ntawm 30 degrees
Transformer Yyn0 kev sib txuas: HV sab hnub qub, LV sab hnub qub thiab nruab nrab, tsis muaj theem sib txawv ntawm HV thiab LV
Dyn 11
Raws li lub high-voltage sab ntawm daim duab peb sab wiring, thaum transformer core xoom-sequence flux los yog lub thib peb harmonic flux, nyob rau hauv daim duab peb sab winding inductively generated xoom-sequence electromotive quab yuam los yog lub thib peb harmonic electromotive quab yuam, vim qhov no induced electromotive quab yuam rau. peb theem zoo tib yam, nyob rau hauv daim duab peb sab winding superposition ntawm koob, thiab tsim cov khoom siv tam sim no. Qhov zero-sequence (thib peb harmonic) circulating tam sim no generates ib antimagnetic flux, uas tsis muaj zog lub zero-sequence (thib peb harmonic) flux nyob rau hauv lub hlau core kom tsawg, thiab yog li txo qhov nruab nrab voltage hloov ntawm lub hnub qub-wired winding nyob rau hauv qis. - voltage sab. Nyob rau tib lub sij hawm kuj ua rau lub high-voltage sab ntawm winding nyob rau hauv lub zero sequence (thib peb harmonic) induced electromotive quab yuam yog txo kom tsawg, yog li zam qhov tsawg-voltage sab ntawm lub load tam sim no waveform distortion tshwm sim los ntawm high-voltage. sab ntawm daim phiaj hluav taws xob hluav taws xob voltage waveform yog paug. Yog li ntawd, ib tug transformer nrog delta thaiv thaiv kev cuam tshuam ntawm qhov thib peb harmonic los yog xoom sequence flux ntawm qhov voltage waveform ntawm high-voltage sab fais fab mov. Tsis tas li ntawd, txoj kev sib txuas no kuj zoo rau kev tiv thaiv overvoltage ntawm xob laim incursion yoj. Vim hais tias peb-theem xob laim intrusion nthwv dej kuj nyob rau hauv tib txoj kev, qhov mob no zoo ib yam li xoom-sequence tam sim no, lub circulating tam sim no generated nyob rau hauv daim duab peb sab winding, lub magnetic flux generated los ntawm xob laim tam sim no nyob rau hauv peb-theem core ntawm lub transformer kuj muaj kev cuam tshuam.
GB/T{{0}} "Power Transformer Application Guidelines" qhia tias: raws li pes tsawg zaus impedance ntawm Yyn transformer siab li 60%, qhov nruab nrab tam sim no yuav tsum tsis txhob ntau tshaj 10% ntawm cov ntsuas tam sim no ; Qhov xoom ntu impedance ntawm Dyn transformer tsuas yog 0.9 npaug ntawm qhov zoo ib ntus luv luv-circuit impedance, thiab qhov nruab nrab tuaj yeem nrog cov ntsuas tam sim no.
Txawm li cas los xij, Dyn11 kev twb kev txuas transformer fais fab mov sab xws li poob fuse li overload thiab luv luv-circuit tiv thaiv, muaj ib theem fuse tshuab, uas yog, high-voltage sab ntawm ib-theem disconnection, ces sab qis-voltage ntawm lub ob-theem theem voltage ntawm tus nqi ntawm 1/2 ntawm qhov ntsuas hluav taws xob, uas yog, los ntawm 220V txog 110V, tom qab ntawd, cov tub yees thiab lwm yam khoom siv hauv tsev yuav tsis tuaj yeem pib vim qhov ua rau burnout. Nyob rau hauv cov ntaub ntawv no, qhov tsawg voltage sab ntawm lub transformer nrog Dyn11 kev twb kev txuas yuav tsum tau nruab nrog txhim khu kev qha low-voltage tiv thaiv.
Yyn 0
Nyob rau hauv hom kev sib txuas ua ke no, muaj ib txoj kab nruab nrab ntawm sab qis qis, thiab qhov thib peb kev sib haum xeeb tam sim no nyob rau hauv qis-voltage load thiab xoom-sequence tam sim no nyob rau hauv peb-theem unbalanced load yuav circulate nyob rau hauv lub transformer winding. cov kab nruab nrab. Yog hais tias lub hauv paus rau peb-theem peb kab, muaj xoom-sequence tam sim no thiab thib peb harmonic tam sim no generated nyob rau hauv lub winding flux tsis tuaj yeem tsim lub voj kaw nyob rau hauv cov tub ntxhais (vim peb-theem core kem nyob rau hauv peb harmonic tam sim no flux thiab xoom. -sequence flux yog nyob rau hauv tib txoj kev), tsuas yog tawm ntawm cov tub ntxhais los ntawm lub transformer insulating nruab nrab (transformer roj) thiab rooj plaub ntawm ferrous hlau thiab lwm yam thiab ces rov qab mus rau lub core. Vim hais tias ntawm cov tub ntxhais sab nraum lub rwb thaiv tsev nruab nrab magnetoresistance yog loj, yog li lub xoom kab sib nqus flux thiab qhov thib peb harmonic magnetic flux yog me dua. Tab sis lub xoom sequence electromotive quab yuam thiab lub thib peb harmonic electromotive quab yuam generated los ntawm nws induction, superimposed nyob rau theem voltage, thiaj li hais tias peb-theem voltage asymmetry, ua rau lub nruab nrab point displacement, ib co theem voltage nce, ib co theem voltage txo. Txhawm rau tiv thaiv qhov tsis txaus ntseeg ntawm peb-theem theem voltage, cuam tshuam rau kev siv hluav taws xob ib txwm muaj, kev lag luam tus qauv SD-292-1988 "cov khoom siv hluav taws xob faib khoom siv hluav taws xob thiab cov txheej txheem kev ua haujlwm (rau kev sim siv)" ntawm peb-theem load imbalance yuav tsum tsis txhob ntau tshaj 15%. Cia ib tug me me ntawm ib-theem loads nyob rau hauv peb-theem transformers, tab sis qhov nruab nrab tam sim no yuav tsum tsis txhob ntau tshaj 25% ntawm cov rated tam sim no. Yog li cov kev cai no yog tsim los txwv qhov nruab nrab qhov hluav taws xob hloov mus txog li 5 feem pua.
Yog hais tias Yyn {{0}} linkage transformer, nws cov tub ntxhais rau peb-theem tsib-ncej qauv, ces cov tub ntxhais ntawm lub zero sequence (los yog lub thib peb harmonic) flux yuav circulated los ntawm sab kab, dua li ntawm lub lub thawv ncig ntawm lub magnetoresistance kom tsawg dua, yog li ntawd, qhov xoom ib ntus (los yog qhov thib peb harmonic) flux tshaj li peb-theem peb-ncej transformer yog loj dua li xoom sequence (los yog thib peb harmonic) electromotive quab yuam generated los ntawm induction. nyob rau hauv lub windings yog loj dua, yog li ntawd qhov nruab nrab point voltage hloov chaw yog loj, peb-theem voltage imbalance nce, yog li ntawd, Yyn{10}} linkage transformer tsis yog siv nyob rau hauv peb-theem tsib-ncej qauv los yog peb ib theem. kev sib txuas ntawm transformer. Theem voltage imbalance nce, yog li ntawd, Yyn0 linkage pawg ntawm transformers tsis siv peb-theem tsib-ncej qauv los yog peb ib-theem transformer linkage.
