Cov Lus Qhia rau Transformer Electrostatic Shields (E-shields)

E-shield yog dab tsi?
Ib daim ntaub thaiv hluav taws xob yog ib daim ntawv nyias nyias uas tsis muaj hlau nplaum. Daim ntaub thaiv no yog tooj liab lossis txhuas. Daim ntawv nyias nyias no nyob nruab nrab ntawm cov xov hluav taws xob thawj thiab thib ob ntawm lub transformer. Daim ntawv hauv txhua lub kauj txuas ua ke nrog ib tus xov hluav taws xob uas khi rau lub chassis ntawm lub transformer.

E-shields ua dab tsi hauv transformers?
Cov E-shields hloov cov teeb meem hluav taws xob tsis zoo ntawm lub transformer cov kauj thiab cov khoom siv hluav taws xob rhiab heev hauv cov kab ke hluav taws xob. Qhov no tiv thaiv lub transformer thiab lub kaw lus txuas nrog nws.
Cia peb saib qhov no kom meej ntxiv pib nrog cov E-shields tiv thaiv dab tsi.

Kev txo qis
Ntau lub voj voog hluav taws xob niaj hnub no raug rau qhov nce siab ib ntus thiab suab nrov hom. Lub E-shield uas tau grounded ua rau cov kev cuam tshuam no tsis zoo (tsawg kawg).

Daim duab saum toj no sab laug qhia txog qhov hluav taws xob nce siab ib ntus. Hom kev nce siab ntawm qhov hluav taws xob no yog los ntawm cov khoom siv hauv chaw ua haujlwm xws li khoos phis tawj lossis cov tshuab luam ntawv. Cov inverters kuj yog qhov chaw feem ntau ntawm qhov nce siab ib ntus. Daim duab sab xis qhia txog ib qho piv txwv ntawm lub suab nrov hom hauv lub voj voog hluav taws xob. Lub suab nrov hom yog ib qho uas pom ntau hauv cov voj voog hluav taws xob. Cov kab ke uas tsis muaj xov hlau zoo nrog kev tiv thaiv cable tsis zoo feem ntau raug kev txom nyem los ntawm lub suab nrov hom.
Tam sim no cia peb saib seb E-shield daws cov teeb meem no li cas.

Kev Sib Txuas Capacitive
Ib lub E-shield uas muaj grounded txo qhov kev sib txuas capacitive ntawm cov windings thawj thiab theem ob. Es tsis txhob sib txuas nrog lub secondary winding, lub primary winding sib txuas nrog E-shield. Lub grounded E-shield muab txoj kev qis impedance mus rau hauv av. Cov teeb meem voltage raug redirected deb ntawm lub secondary winding. Qhov no kuj ua haujlwm los ntawm lwm qhov kawg ntawm lub transformer (theem ob mus rau theem thawj).

Cov suab nrov ntawm lub zog hluav taws xob thiab hom suab nrov tuaj yeem ua rau cov transformers thiab lwm yam khoom siv hluav taws xob puas tsuaj. Ib daim ntaub thaiv electrostatic ntawm cov kauj hluav taws xob siab thiab qis txo cov kev pheej hmoo no. Ib qho kev xav tseem ceeb thaum muab hluav taws xob rau cov khoom siv hluav taws xob rhiab heev.

Piv txwv ntawm Transformers uas siv E-shield
Cov Hloov Hluav Taws Xob Hnub Ci thiab Cua
Kev cuam tshuam harmonic thiab kev hloov pauv tshwj xeeb los ntawm cov inverters hnub ci tau hloov mus rau lub grid hluav taws xob. Cov kev cuam tshuam voltage no tsim cov teebmeem zoo li impulse hauv HV winding pub rau lub grid. Transient overvoltage spikes ntawm sab hluav taws xob kuj tuaj yeem hla mus rau lub inverter. Cov xwm txheej overvoltage no tuaj yeem ua puas rau cov khoom rhiab heev ntawm lub inverter. E-shields muab kev tiv thaiv rau ob qho tib si transformer, lub grid, thiab inverter.
Kawm ntxiv txog qhov loj thiab tsim ntawm lub hnub ci transformer.

Tsav Tsheb Kev rho tawm Transformers
Cov transformers cais tsav tau tsim los kom tiv taus cov teeb meem voltage siab (harmonics). Cov teeb meem no yog los ntawm cov khoom siv xws li lub cev muaj zog tsav (lossis VFDs). Yog li ntawd, lo lus "tsav" hauv lub npe. Ntxiv rau harmonics, lub cev muaj zog tsav kuj tseem yuav ua rau muaj lwm yam teeb meem voltage (xws li suab nrov hom). Qhov no yog qhov uas E-shield los ua si. Cov transformers cais tsav suav nrog tsawg kawg ib qho E-shield ntawm cov kauj HV thiab LV. Ntau lub shields kuj siv tau thiab. E-shields kuj tseem yuav muab tso rau ntawm cov kauj sab hauv thiab cov ceg tseem ceeb.
Cov ntawv thov uas muaj kev cuam tshuam ntawm lub zog hluav taws xob (xws li kev nce siab sai sai thiab suab nrov hom) tau txais txiaj ntsig los ntawm lub transformer nrog E-shield. E-shields pheej yig, thiab muab cov nyiaj rov qab los ntawm kev nqis peev uas cov teeb meem zoo ntawm lub zog yog qhov txaus ntshai.