E-shield yog dab tsi?
Electrostatic shield yog ib daim ntawv nyias uas tsis yog hlau nplaum. Cov ntaub thaiv npog tuaj yeem yog tooj liab lossis txhuas. Daim ntawv nyias no mus nruab nrab ntawm lub transformer's thawj thiab theem nrab windings. Daim ntawv nyob rau hauv txhua lub kauj txuas ua ke nrog ib tus neeg xyuas pib uas txuas rau lub tshuab hluav taws xob chassis.
E-shields ua dab tsi hauv transformers?
E-shields redirect teeb meem voltage cuam tshuam deb ntawm lub transformer's coils thiab rhiab electronics nyob rau hauv hluav taws xob systems. Qhov no tiv thaiv lub transformer thiab lub kaw lus txuas nrog nws.
Cia peb saib qhov no hauv kev nthuav dav ntxiv pib nrog dab tsi E-shields tiv thaiv.
Attenuation
Muaj ntau lub tshuab hluav taws xob niaj hnub no raug cuam tshuam los ntawm kev hloov pauv thiab lub suab nrov. Lub hauv paus E-shield attenuates (tsawg) cov kev cuam tshuam no.
Cov duab saum toj no nyob rau sab laug qhia tau hais tias ib qho kev hloov pauv hloov pauv hloov pauv. Hom kev nce siab ntawm qhov khoom siv hluav taws xob no tshwm sim los ntawm cov khoom siv hauv chaw ua haujlwm xws li khoos phis tawj lossis tshuab luam ntawv. Inverters kuj yog ib qho chaw ntawm kev ncua sij hawm spikes. Daim duab ntawm sab xis qhia tau hais tias ib qho piv txwv ntawm hom suab nrov hauv hluav taws xob hluav taws xob. Hom suab nrov yog muaj nyob rau hauv hluav taws xob circuits. Cov kab hluav taws xob tsis zoo nrog kev tiv thaiv kab mob tsis zoo feem ntau raug kev txom nyem los ntawm hom suab nrov.
Tam sim no cia saib yuav ua li cas E-shield cuam tshuam nrog cov kev cuam tshuam no.
Capacitive Coupling
Lub hauv paus E-shield txo cov capacitive coupling ntawm thawj thiab theem nrab windings. Ntau dua li kev sib txuas nrog cov kev sib tw thib ob, cov thawj winding khub nrog E-shield. Lub grounded E-shield muab ib txoj kev uas tsis muaj impedance rau hauv av. Voltage cuam tshuam yog redirected deb ntawm lub thib ob winding. Qhov no kuj ua haujlwm los ntawm lwm qhov kawg ntawm lub transformer (secondary mus rau thawj).
Transient spikes thiab hom suab nrov tuaj yeem ua rau cov transformers thiab lwm yam khoom siv hluav taws xob puas. Ib qho hluav taws xob tiv thaiv hluav taws xob nruab nrab ntawm cov hluav taws xob siab thiab cov hluav taws xob qis qis txo cov kev pheej hmoo zoo li no. Ib qho tseem ceeb xav txog thaum muab lub zog rau cov khoom siv hluav taws xob rhiab heev.
Piv txwv ntawm Transformers uas siv E-shield
Hnub Ci & Cua Transformers
Harmonic cuam tshuam thiab kev hloov tshwj xeeb los ntawm lub hnub ci inverters tau pauv mus rau daim phiaj siv hluav taws xob. Cov kev cuam tshuam hluav taws xob no tsim kev cuam tshuam zoo li hauv HV winding pub rau kab sib chaws. Transient overvoltage spikes ntawm qhov hluav taws xob sab tuaj yeem dhau mus rau inverter. Cov xwm txheej overvoltage no tuaj yeem ua rau lub inverter puas's rhiab Cheebtsam. E-shields muab kev tiv thaiv rau ob qho tib si transformer, daim phiaj, thiab lub inverter.
Kawm paub ntau ntxiv txog hnub ci transformer sizing thiab tsim cov cai.
Tsav Isolation Transformers
Tsav rho tawm transformers yog tsim los tiv taus siab zaus voltage cuam tshuam (harmonics). Cov kev cuam tshuam zoo li no tshwm sim los ntawm cov khoom siv xws li tsav tsheb (lossis VFDs). Yog li lo lus“tsav”hauv lub npe. Ntxiv nrog rau kev sib haum xeeb, lub cev muaj zog kuj tseem tuaj yeem qhia lwm yam kev cuam tshuam hluav taws xob (xws li hom suab nrov). Qhov no yog qhov E-shield los ua si. Tsav rho tawm hluav taws xob muaj xws li tsawg kawg ib E-shield ntawm HV thiab LV coils. Ntau daim thaiv kuj tseem siv tau thiab. E-shields tuaj yeem muab tso rau nruab nrab ntawm cov coils sab hauv thiab cov caj dab tseem ceeb.
Cov ntawv thov uas muaj qhov cuam tshuam ntawm qhov hluav taws xob (xws li kev hloov pauv hloov pauv thiab lub suab nrov) tau txais txiaj ntsig los ntawm kev hloov pauv nrog E-shield. E-shields yog pheej yig, thiab muab cov txiaj ntsig tseem ceeb ntawm kev nqis peev uas muaj teeb meem hluav taws xob zoo yog qhov kev hem thawj.
Post lub sij hawm: Aug-08-2024