Lub luag haujlwm tseem ceeb ntawm cov hluav taws xob hloov hluav taws xob hauv kev sib txuas sib txuas yog cais cov hluav taws xob siab thiab hloov nws mus rau qhov tsis tshua muaj hluav taws xob siv rau hauv cov khoom siv tiv thaiv relay, cov khoom siv tsis siv neeg, thiab ntsuas ntsuas, yog li tau txais cov teeb liab voltage ntawm thawj sab. Raws li nws txoj haujlwm ua haujlwm, voltage transformers tuaj yeem muab faib ua ob pawg hauv qab no:
1, Hluav Taws Xob Hluav Taws Xob Hluav Taws Xob (PT)
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm electromagnetic voltage transformers yog zoo ib yam li lub zog transformers, feem ntau yog raws li lub hauv paus ntsiab lus ntawm electromagnetic induction, thiab yog haum rau lub hwj chim systems xws li 6kV mus rau 110kV. Raws li cov txheej txheem rwb thaiv tsev sib txawv, nws tuaj yeem muab faib ua ob hom: roj immersed (feem ntau siv sab nraum zoov) thiab qhuav (cam khwb cia nrog epoxy resin).
2, Capacitive Voltage Transformer (CVT)
Capacitive voltage transformers txais lub hauv paus ntsiab lus ntawm capacitive voltage division thiab muaj cov khoom xws li capacitive voltage dividers, compensating reactors, intermediate transformers, thiab dampers. Lawv tsuas yog tsim nyog rau lub tshuab hluav taws xob xws li 110kV txog 500kV, thiab tseem muaj daim ntawv thov me me hauv 35kV systems.
Raws li lub teb chaws tus qauv GB 1207-2006 "Electromagnetic Voltage Transformers", voltage transformers yuav muab faib ua "ungrounded voltage transformers" (tag nrho insulated) thiab "grounded voltage transformers" (semi insulated). Lub davhlau ya nyob twg hauv av (N davhlau ya nyob twg) ntawm cov thawj winding ntawm ib tug semi insulated voltage transformer yog tsim los nyob ze rau lub thib ob winding, thiab lub ntsiab rwb thaiv tsev ntawm cov thawj winding, theem nrab winding, thiab av bears ib tug tsawg voltage. Hauv GB1207-2006, nws tau teev tseg tias lub zog zaus tiv taus qhov hluav taws xob ntawm 6/10kV voltage transformers tsuas yog 3kV, thaum lub zog zaus tiv taus qhov voltage ntawm 35kV voltage transformers yog 5kV.
Electromagnetic voltage transformers qhia tshwj xeeb saturation yam ntxwv ntawm lub excitation yam ntxwv nkhaus vim muaj cov hlau cores. Thaum cov excitation tam sim no nce, qhov nce ntawm qhov zoo siab voltage tus nqi yog me me los yog nyob twj ywm, ua ib tug tig point. Qhov no txhais tau hais tias raws li qhov excitation tam sim no nce, qhov zoo siab voltage hloov me ntsis los yog nyob twj ywm (inductance txo). Raws li cov kev cai cuam tshuam ntawm 18 qhov kev tawm tsam (hloov kho version) ntawm Xeev Grid Corporation ntawm Tuam Tshoj:
1. Cov yam ntxwv zoo siab ntawm cov khoom siv hluav taws xob tshiab tshiab yuav tsum tau ntsuas thaum lub sij hawm xa mus kom ntseeg tau tias lawv cov saturation tsis tsawg dua 1.9 npaug;
Rau cov hluav taws xob hloov hluav taws xob uas twb tau muab tso rau hauv kev ua haujlwm, yog tias lawv qhov saturation tsawg dua lossis sib npaug li 1.5 npaug, hloov yuav tsum tau txiav txim siab; Yog tias qhov saturation nyob nruab nrab ntawm 1.5 npaug thiab 1.9 zaug, cov khoom siv sib haum xeeb tshem tawm tuaj yeem raug teeb tsa los txo lossis txo qis resonance overvoltage.
Raws li kev txheeb cais, nyob rau hauv xyoo tas los no, qhov kev faib ua feem ntawm electromagnetic voltage transformers siv nyob rau hauv loj kis tau tus mob thiab tis lag luam ntawm lub State Grid tau mus txog ntau tshaj 80%. Txawm li cas los xij, nrog kev nthuav dav thiab kev txhim kho ntawm lub zog hluav taws xob, qhov teeb meem ntawm ferromagnetic resonance overvoltage nyob rau hauv substations tshwm sim los ntawm PT hlau core saturation nyob rau hauv nruab nrab ungrounded systems ntawm 35KV thiab hauv qab no yog nce zuj zus, ua rau tsis tshua muaj xwm txheej xws li PT fuse melting thiab PT. burnout, ua rau muaj kev hem thawj rau kev nyab xeeb thiab ruaj khov ua haujlwm ntawm lub zog hluav taws xob. Yog li ntawd, rau ntau hom hluav taws xob hluav taws xob hluav taws xob hluav taws xob, peb yuav tsum tsim kom muaj kev tswj xyuas resonance zoo sai li sai tau.
