Puas siab dua Transformer Impedance Ib txwm zoo dua?

Tsis ntev los no, tus neeg siv khoom koom nrog hauv kev lag luam casting hu rau peb los kho cov khoom lag luam4500kVA 10/0.575 × 4 roj- raus transformer. Thaum lub sij hawm kev sib tham, nws tau hais meej kom luv luv -circuit impedance los tsim siab tshaj 9% los txhim kho lub transformer luv luv -circuit resistance. Raws li kev xam raws li cov yam ntxwv ntawm kev thauj khoom, peb pom zoo kom tus qauv impedance ntawm 7%.

 

Qhov no ua rau cov lus nug ntev - sib cav thiab nkag siab yooj yim hauv kev lag luam:Puas yog qhov siab dua impedance voltage (Ud%) zoo dua rau transformers?

 

Ntau tus neeg ua haujlwm, tshwj xeeb tshaj yog cov tswv ntawm casting thiab smelting nroj tsuag, ntseeg hais tias impedance siab dua txhais tau hais tias muaj zog tiv thaiv surge thiab luv luv - Circuit Court faults, muab kev ruaj ntseg zoo dua. Tab sis qhov no puas yog qhov tseeb?

 

 

Kab lus no tau txheeb xyuas qhov ob -edged ntaj nyhuv ntawm transformer impedance, thiab piav qhia tias vim li cas cov impedance siab dhau heev lawm ua rau kom muaj zog noj thiab nce nqi hluav taws xob.

 

 

Cias muab, impedance voltage (luv-circuit impedance) yog hais txog lub sab hauv tsis kam rau hluav taws xob tam sim no hauv lub transformer.

 

• Tsawg impedance (4% - 6%): Zoo ib yam li txoj kev ncaj ncaj. Tam sim no ntws smoothly thiab voltage tseem ruaj khov. Txawm li cas los xij, nyob rau hauv qhov kev tshwm sim ntawm ib tug luv luv Circuit Court, lub unrestrained tam sim no yuav ua rau muaj kev puas tsuaj loj heev.

 

• Siab impedance (8% - 15%): Muab piv rau kev nrawm nrawm ntawm txoj kev. Nws txwv lub ncov luv luv -circuit tam sim no thiab tiv thaiv cov khoom siv hauv qab. Lub downside yog siab zog poob.

 

Xaus: Tsis tshua muaj siab thiab siab dhau impedance yog qhov zoo tagnrho. Tus nqi tsim nyog tshaj plaws muab qhov kev ua tau zoo tshaj plaws.

 

 

Rau qhov no 4500kVA roj-immersed transformer rau casting daim ntaub ntawv, peb lo rau 7% impedance 9% rau peb lub ntsiab tseem ceeb:

 

1. Kev hloov hluav taws xob hnyav txo qis kev ua haujlwm zoo

Roj-immersed transformers rau tej yam kev mob ua hauj lwm muaj kev hloov pauv hnyav, los ntawm kev kub siab tam sim no thaum pib mus rau kev ua haujlwm ruaj khov thaum lub sij hawm yaj. Lub impedance ncaj qha txiav txim siab qhov voltage tswj tus nqi ntawm ob sab.

• 7% impedance: Voltage poob yog khaws cia rau hauv qhov tsim nyog, ua kom ruaj khov ntawm qhov nruab nrab - zaus fais fab mov.
• 9% impedance: Output voltage fluctuates deb dua drastic nrog load hloov. Qhov no ua rau lub zog tsis ruaj khov ntawm qhov nruab nrab - zaus ntawm lub tshuab hluav taws xob, ua kom lub sijhawm melting, txo qis kev tsim khoom thiab ua rau tsis zoo ntawm cov hlau molten.

 

2. Soaring Reactive zog poob

Contrary to common misconceptions, siab impedance tsis yog ib tug me me pov tseg ntawm conductors. Lub reactive tivthaiv (X) ntawm impedance tsis tu ncua siv reactive zog.

 

• Formula rau reactive zog poob: Q≈I2X

 

Nce lub impedance los ntawm 7% mus rau 9% nce lub reactive tivthaiv los ntawm 28.6%. Lub transformer yuav kos ntau lub zog reactive los ntawm daim phiaj hluav taws xob los tswj nws qhov chaw sib nqus.

 

Yog li ntawd, lub zog ntawm lub zog yuav poob qis heev. Cov cai tswj fais fab tuagpower factor surchargentawm cov neeg siv uas nws lub hwj chim qhov tseem ceeb poob qis dua tus qauv (feem ntau 0.9) los them rau cov kab poob. Rau 4500kVA transformer, tus nqi hluav taws xob ntxiv txhua xyoo tuaj yeem ncav cuag kaum txhiab nyiaj.

 

3. Ua kom tooj liab poob thiab overheating txaus ntshai

Txhawm rau txhawb impedance, manufacturers feem ntau nce winding lem lossis nthuav txoj kev sib nqus to. Qhov no ua rau muaj kev nce siab hauv load poob (tooj liab poob). Tag nrho cov hluav taws xob ntau dhau raug hloov mus rau hauv tshav kub, yuam kom lub tshuab ua kom txias ua haujlwm ntau zaus. Nyob rau hauv lub caij ntuj sov huab cua, lub transformer tej zaum yuav ua rau overtemperature tswb.

 

 

Hauv qab no yog kev lag luam- tus qauv impedance siv rau ntau yam xwm txheej:

Daim ntawv thov Scenario	Pom zoo Impedance Range	Txoj Cai Xaiv
General faib transformer	4% - 6%	Ua ntej qhov kev ruaj ntseg voltage thiab qis zog poob
Nruab nrab-frequency furnace / Rectifier transformer	6% - 8%	Qhov zoo tshaj plaws sib npaug ntawm kev txwv tam sim no thiab kev siv hluav taws xob
Lub zog loj transformer	8% - 12%	Tsom ntsoov rau kev txwv luv luv -circuit tam sim no los tiv thaiv kab hluav taws xob
Tshwj xeeb siab -impedance transformer	Tshaj 15%	Rau qhov chaw tshwj xeeb xws li chav kuaj; yuav tsum tau nruab nrog dynamic reactive zog them nyiaj pab kiag li lawm

 

Siab impedance yeej tsis sib npaug kev ua tau zoo dua. Rau qhov no 4500kVA roj-immersed transformer, 7% yog qhov ntau npaum li cas, thaum 9% ua rau kev siv zog ntau dhau. Peb muaj peev xwm tsim tau 9% impedance, tab sis rau koj lub sijhawm ntev - cov txiaj ntsig zoo, peb xav kom 7% - nws yog lub zog ntau dua -txuag, ruaj khov thiab nqi{11}} zoo.

Tau txais ib nqe lus

 

Thaum muas transformers rau casting nroj tsuag, steel mills los yog submerged arc furnaces, tsis txhob tsom rau ntawm impedance. Ua tib zoo saib xyuas kom tsis muaj-load poob, load poob thiab kev tshaj lij los tiv thaiv- luv- Circuit Court tsim qauv. Cov yam tseem ceeb no muaj txiaj ntsig ntau dua li tsuas yog nce impedance los ntawm qhov me me.