Txoj Kev Txiav Txim Siab thiab Kev Tiv Thaiv rau Peb-theem Unbalance (2)
(2) Dab tsi yog qhov ua rau peb-theem tsis sib npaug?
ib. Muaj ntau qhov laj thawj rau qhov tsis sib npaug ntawm peb-theem voltage, xws li ib-theem grounding, disconnection resonance, thiab lwm yam. Cov neeg ua haujlwm thiab cov neeg ua haujlwm tswj tau ceev nrooj nrog lawv tsuas yog tias lawv raug qhov txawv.
b. Disconnection txhaum
Yog hais tias ib theem yog disconnected tab sis tsis grounded, los yog yog hais tias ib theem ntawm lub Circuit Court breaker thiab cais hloov tsis txuas, lub fuse ntawm voltage transformer yog tshuab, uas yuav ua rau peb-theem tsis asymmetrical. Thaum ib theem ntawm cov kab ntawm cov theem dhau los voltage raug txiav, qhov voltage ntawm qib tom ntej voltage qhia tau hais tias qhov voltages ntawm peb theem yog txo, ib tug yog qis dua thiab lwm yam ob theem yog siab dua, tiam sis qhov voltage qhov tseem ceeb ntawm lub ob tug nyob ze. Thaum cov kab ntawm theem no raug txiav tawm, theem voltage ntawm cov kab tsis sib txuas yog xoom, thiab theem voltage ntawm cov kab tsis sib txuas tseem yog theem voltage.
c. av txhaum
Thaum ib theem ntawm txoj kab raug txiav thiab ib theem yog grounded, txawm hais tias peb-theem voltage tsis sib npaug, tus nqi voltage tsis hloov tom qab grounding. Single-theem grounding yog muab faib ua metallic grounding thiab non-metallic grounding. Hlau grounding, qhov voltage ntawm lub faulty theem yog xoom los yog ze rau xoom, thiab lub voltage ntawm lub tsis-faulty theem yog nce los ntawm 1.732 lub sij hawm thiab nyob twj ywm unchanged rau lub sij hawm ntev. Tsis yog-metallic grounding, lub grounding theem voltage tsis yog xoom tab sis txo qis rau qee tus nqi, thiab lwm yam ob theem tau tsa tsawg dua 1.732 zaug.
d. Yog vim li cas rau resonance
Nrog rau txoj kev loj hlob sai ntawm kev lag luam, cov khoom siv hluav taws xob tsis muaj hluav taws xob tau nce ntau heev. Qee qhov kev thauj khoom tsis yog tsuas yog tsim kom muaj kev sib haum xeeb, tab sis kuj ua rau lub zog hloov hluav taws xob hloov pauv thiab flicker, thiab txawm tias ua rau peb-theem voltage imbalance.
Muaj ob hom peb-theem voltage imbalance tshwm sim los ntawm resonance:
1) Qhov tseem ceeb resonance
Qhov tseem ceeb zaus resonance muaj cov yam ntxwv zoo ib yam li ib-theem grounding, uas yog, qhov voltage ntawm ib theem txo thiab qhov voltage ntawm ob theem nce. Nws yog qhov nyuaj rau nrhiav qhov txhaum thaum nrhiav qhov ua rau qhov txhaum. Lub sijhawm no, cov neeg siv tshwj xeeb tuaj yeem kuaj xyuas. Yog tias nws tsis yog qhov laj thawj hauv av, nws yuav tshwm sim los ntawm resonance.
2) Zaus division resonance
Lwm qhov yog qhov sib faib zaus resonance lossis high zaus resonance, uas yog tus cwj pwm los ntawm kev nce ib txhij ntawm peb-theem voltage.
Tsis tas li ntawd, nws yuav tsum tau muab sau tseg tias thaum lub airdrop busbar txiav tawm ib feem ntawm txoj kab los yog ib-theem grounding txhaum ploj mus, yog hais tias ib tug grounding teeb liab tshwm sim thiab qhov voltage ntawm ib, ob los yog peb theem siab tshaj cov kab voltage, tus pointer. ntawm lub voltmeter hits lub taub hau thiab txav maj mam nyob rau tib lub sijhawm. Los yog peb-theem voltage nce ntau dua li cov kab hluav taws xob nyob rau hauv lem. Hauv qhov no, nws feem ntau tshwm sim los ntawm resonance.
e. Tsis tsim nyog faib ntawm peb-theem loads
Ntau tus neeg ua haujlwm uas teeb tsa cov ntsuas hluav taws xob thiab txuas hluav taws xob tsis muaj kev txawj ntse thiab lub tswv yim ntawm peb-theem load tshuav nyiaj li cas, yog li lawv tsis xyuam xim rau kev tswj peb-theem load tshuav nyiaj li cas thaum txuas hluav taws xob. Tsuas yog blindly thiab randomly txuas lub Circuit Court thiab nruab lub 'meter', uas ua rau lub imbalance ntawm peb-theem load mus rau ib tug loj npaum li cas. Qhov thib ob, feem ntau ntawm cov circuits hauv peb lub teb chaws tau ua ke nrog lub zog thiab teeb pom kev zoo, yog li thaum siv cov khoom siv hluav taws xob ib zaug, kev siv hluav taws xob yuav raug txo. Qhov sib txawv no ntxiv exacerbates lub unbalanced mob ntawm peb-theem load ntawm lub tis transformer.
f. Kev hloov tsis tu ncua ntawm hluav taws xob load
Cov laj thawj ntawm cov hluav taws xob tsis ruaj khov muaj xws li kev rhuav tshem ntawm thaj av II tsis tu ncua, kev hloov chaw ntawm cov meters, lossis kev nce hauv cov neeg siv hluav taws xob. Instability ntawm kev siv hluav taws xob ib ntus thiab raws caij nyoog. Nyob rau hauv txoj kev no, qhov tsis paub meej thiab qhov concentration ntawm tag nrho cov nyiaj thiab lub sijhawm ua rau cov khoom siv hluav taws xob tau hloov pauv nrog qhov xwm txheej tiag tiag.
g. Tsis muaj zog ntawm kev saib xyuas rau kev faib khoom transformer loads
Hauv kev tswj hwm ntawm ib lub network faib, cov teeb meem kev tswj hwm hauv peb theem load faib feem ntau tsis quav ntsej. Nyob rau hauv kev tshawb pom ntawm lub network faib, peb-theem load ntawm lub transformer faib tsis tu ncua thiab kho. Tsis tas li ntawd, muaj ntau yam uas ua rau qhov tshwm sim ntawm peb-theem tsis sib npaug, xws li kev cuam tshuam ntawm txoj kab thiab lub sijhawm tsis muaj zog ntawm lub sijhawm peb-theem thiab lwm yam.
