Ib qho - cheeb tsam cua sov platen ntawm cov xovxwm tseem ceeb tuaj yeem dheev txias - tsis yog vim lub tshuab cua sov tsis ua haujlwm, tab sis vim tias ib qho ceev ceev - tshuab fuse hauv cov khoom siv tseem ceeb thaum lub sijhawm sib xyaw ua ke ntawm ntau thaj chaw pib ib txhij. Thaum cov cuab yeej tiv thaiv tsis ua haujlwm zoo, qhov kev tshwm sim me me tuaj yeem nce mus rau hauv kev kaw tag nrho.
Kev xaiv fuse thiab kev sib koom ua ke kom ntseeg tau tias kev tiv thaiv hluav taws xob tseem xaiv tau, ruaj khov, thiab ua siab ntev ntawm kev coj tus cwj pwm thermal, tshwj xeeb tshaj yog thaum lub caij txias pib hauv ntau - thaj chaw cua sov.
Nkag siab txog Kev Ua Phem Tsis Txaus Siab hauv Multi-Zone Heating Systems
A fuse tiv thaiv ntau- thaj chaw cua sov phaj teeb meem kev mus ncigFeem ntau tshwm sim thaum cov cuab yeej tiv thaiv teb sai dhau rau cov xwm txheej tsis muaj mob tsis zoo es tsis yog qhov tshwm sim txhaum cai.
Hauv cov tshuab cua sov, qhov tshwm sim feem ntau yog inrush tam sim no thaum pib. Cov khoom siv cua sov ua rau muaj kev tiv thaiv qis dua thaum txias, uas ua rau kom siab dua qhov pib tam sim no.
Rau nichrome-raws li cua sov cov ntsiab lus, txias kuj tuaj yeem kwv yees li:
Rcold≈0.85 RhotR_{cold} \\approx 0.85\\,R_{hot}Rcold≈0.85Rhot
Qhov kev txo qis hauv kev tiv thaiv no tuaj yeem ua rau muaj kev cuam tshuam tam sim no rau lub sijhawm luv kom txog thaum lub caij mus txog qhov kub thiab txias.
Thaum ntau thaj chaw muaj zog ib txhij, qhov sib xyaw ua ke ntawm cov khoom thauj tuaj yeem dhau qhov kev zam tam sim ntawm cov khoom siv tiv thaiv tsis raug xaiv.
Zone-Qib Fuse Xaiv Tswv Yim
Txhua cheeb tsam cua sov hauv ntau-zone platen yuav tsum muaj kev tiv thaiv ntawm nws tus kheej kom tsis txhob muaj teeb meem hauv cheeb tsam los cuam tshuam rau tag nrho cov kab ke.
Sijhawm -Ntev Fuse xaiv
Ntawm thaj tsam, kev tiv thaiv yuav tsum tau muab siv sijhawm - ncua (slow- tshuab) fuses.
Cov khoom siv no yog tsim los zam lub sijhawm luv luv - lub sijhawm tam sim no surges thaum teb sai sai rau cov overloads los yog luv luv circuits.
Ib qho kev xaiv zoo tshaj plaws yog:
Fuse ntsuam xyuas=125% ntawm cheeb tsam puv -load tam sim no
Fuse hom=sij hawm- ncua (slow- tshuab)
Cov npoo ntxiv tso cai rau cov xwm txheej zoo li qub dhau mus yam tsis muaj kev cuam tshuam, thaum tseem muaj kev tiv thaiv overcurrent zoo thaum lub sijhawm ua haujlwm txawv txav.
Fuses yog cov tub ceev xwm uas ntsiag to, thiab lawv yuav tsum raug xaiv kom ua siab ntev, tsis yog paranoid.
Main Circuit Protection Coordination
Sizing lub Main Protective Device
Lub ntsiab breaker lossis fuse muab tag nrho cov cua sov platen yuav tsum muaj qhov loj me kom haum rau tag nrho cov kab ke:
Kev tiv thaiv tseem ceeb ≈ 125% ntawm tag nrho cov platen tam sim no
Txawm li cas los xij, sizing ib leeg tsis txaus. Kev sib koom ua ke ntawm cov yam ntxwv mus txawv tebchaws yog qhov tseem ceeb los tswj kev xaiv ntawm kev tiv thaiv tseem ceeb thiab cheeb tsam - qib kev tiv thaiv.
Xyuas kom Selective Tripping
Kev sib koom tes kom raug ua kom ntseeg tau tias qhov txhaum hauv ib cheeb tsam cua sov tsuas yog cuam tshuam qhov chaw ntawd, tsis yog tag nrho cov platen system.
Qhov no feem ntau ua tiav los ntawm:
Siv lub thermal-magnetic Circuit Court breaker nrog qeeb siab -inrush teb
Xyuas kom tus kheej ib cheeb tsam fuses muaj cov yam ntxwv clearing sai dua nyob rau hauv qhov teeb meem txhaum cai
Ua kom muaj kev sib cais meej ntawm cov kab hluav taws xob sab saud thiab qis qis tiv thaiv nkhaus
Yog tias kev sib koom ua ke tsim tau zoo, cov fuses hauv qab ua haujlwm ua ntej thaum lub sijhawm ua haujlwm tsis raug, khaws cia tag nrho cov haujlwm ua haujlwm.
Qhov tseem ceeb ntawm Inrush Current Behavior
Txias rhaub hluav taws xob yam ntxwv
Cov khoom cua sov xws li nichrome pom qhov kub thiab txias - nyob ntawm tus cwj pwm tsis zoo.
Thaum lub caij txias pib:
Kev tiv thaiv qis dua
Tam sim no siab dua
Thermal stabilization tseem tsis tau tshwm sim
Qhov xwm txheej tam sim no yog qhov qub thiab yuav tsum tsis txhob raug txhais yuam kev los ntawm cov khoom siv tiv thaiv.
Thaum qhov kub thiab txias ua haujlwm tau mus txog, qhov kev tiv thaiv nce thiab tam sim no stabilizes ntawm qhov ntsuas tsis tu ncua -tus nqi xeev.
Lub luag haujlwm tam sim no -Limiting Fuses
Tam sim no - txwv fuses muab cov txiaj ntsig tiv thaiv ntxiv hauv cov tshuab cua sov uas siv:
Khoom - xeev relays (SSRs)
Cov kab hluav taws xob nyias
Sensitive tswj electronics
Cov fuses no ua haujlwm sai heev nyob rau hauv luv luv -circuit tej yam kev mob, txwv peak txhaum tam sim no thiab txo thermal thiab mechanical stress ntawm downstream Cheebtsam.
Lawv siv tau zoo tshwj xeeb hauv cov kab ke uas cov kab hluav taws xob muaj qhov siab thiab thermal margins tsawg.
Kev sib koom tes ntawm qib kev tiv thaiv
Kev tsim kev tiv thaiv zoo yuav tsum muaj txheej txheej txheej:
Zone-qib qeeb- tshuab fuses tuav inrush thiab localized overloads
Main breaker tswj qhov system- theem faults thiab tiv thaiv upstream
Kev sib koom tes ua kom muaj kev sib cais ntawm kev ua txhaum
Thaum tsim kom zoo, tsuas yog thaj tsam cuam tshuam raug tshem tawm ntawm kev pabcuam, thaum lub platen seem tseem ua haujlwm.
Kev xaiv tus cwj pwm no yog qhov tseem ceeb hauv kev lag luam cua sov loj uas lub sijhawm poob qis ua haujlwm siab.
Zam kev tiv thaiv kev tsim qauv yuam kev
Kev sib koom tes tsis zoo feem ntau tshwm sim los ntawm:
Cov fuses loj tshaj plaws uas tsis tiv thaiv kev xaim
Undersized lub ntsiab breakers uas mus txawv tebchaws thaum pib ib txwm
Fast- tshuab fuses siv nyob rau hauv inductive lossis resistive cua sov loads
Tsis muaj inrush tam sim no xav txog
Kev ntxub ntxaug tsis tsim nyog ntawm cov khoom siv hluav taws xob sab saud thiab qis qis
Txhua yam ntawm cov xwm txheej no yuav ua rau muaj kev cuam tshuam tsis zoo lossis kev kaw haujlwm tsis tsim nyog.
Kev ntseeg tau zoo ntawm kev xaiv Fuse kom raug
Thaum ua kom raug, ib qho kev sib koom tes fuse zoo muab:
Stable startup cwj pwm nyob rau hauv tag nrho cov cheeb tsam
Txo kev dag dag thaum lub sij hawm thermal cycling
Kev rho tawm ntawm qhov txhaum mus rau ib cheeb tsam
Txhim kho kev kuaj mob
Lub sijhawm ua haujlwm siab dua
Kev tiv thaiv zoo dua ntawm SSRs thiab cov hlua hluav taws xob
Kev sib koom tes kom raug ua kom ntseeg tau tias kev tiv thaiv hluav taws xob txhawb nqa kev muaj nyob hauv es tsis txhob cuam tshuam nws.
Xaus
Ib qhov zoo-tsim kev tiv thaiv rau ntau- cheeb tsam cua sov tshuab yuav tsum tau ceev faj xaiv ntawm lub sij hawm- ncua fuses ntawm cheeb tsam theem, feem ntau rated ntawm 125% ntawm tag nrho-load tam sim no, ua ke nrog ib tug zoo sib koom tes lub ntsiab breaker los yog fuse loj rau tag nrho cov system load. Txoj hauv kev no tiv thaiv kev cuam tshuam tsis zoo thaum lub sijhawm muaj kev cuam tshuam ib txwm muaj thaum ua kom ntseeg tau tias qhov tsis raug cais tawm mus rau qhov tsawg tshaj plaws ntawm cov cua sov platen.
Ib tug raug sivfuse tiv thaiv ntau- thaj chaw cua sov phaj teeb meem kev mus ncigLub tswv yim txo qis kom ntseeg tau tias kev coj tus cwj pwm hloov hluav taws xob thaum lub sijhawm pib txias tsis ua rau qhov tsis tsim nyog kaw. Hloov chaw, kev ua txhaum yog nyob hauv zos, khaws cia tag nrho cov kev ua haujlwm ntawm lub cev thiab txhim kho kev tsim khoom txuas ntxiv.
Kev tsim hluav taws xob hauv cov tshuab cua sov yog qhov tseem ceeb ntawm kev tswj tsis ua haujlwm cuam tshuam- kom ntseeg tau tias thaum muaj teeb meem tshwm sim, lawv nyob twj ywm me me, cais, thiab tswj tau ntau dua li qhov system- dav.
