Nhanganyaya
Muzvivakwa zvemazuva ano zveindasitiri, kuvimbika kwesimba uye kurongeka kwechiratidzo kunokosha. Zvigadzirwa zvemagungano zvakanyanyisa, zvivakwa zvekugadzira makemikari, semiconductor cleanrooms, uye nzvimbo dzedata dzinotsamira pamagetsi chaiwo emagetsi kutyaira muchina unorema, maoko emarobhoti, uye anonzwa programmable logic controllers. Zvakadaro, kuseri kwemafacade ekushanda kwakatsetseka, nyonganiso dzemagetsi dzinowanzoita chinyararire mukati memidziyo yekuparadzira. Pakati pezvisina kujeka izvi, zvakakwidzwa Neutral-ku{4}}Earth Voltage (NEV)-inowanzonzi stray voltage, neutral offset, kana neutral-ku{7}}ground voltage{8}}zvinomiririra chimwe chezvinetswa zvinoshungurudza uye zvinoparadza zvinosangana nemainjiniya emagetsi nhasi.
Pakati penzvimbo yeindasitiri yekugovera masimba epamusoro pane Power Distribution Cabinet. Iyi yakavharirwa inoita seyakakosha nhanho apo chekutanga chekushandisa kana chekushandura chikafu chinodzikiswa, kupatsanurwa, uye kufambiswa kuburikidza nemapaza edunhu, mabhazi asina kwaakarerekera, uye mabhazi ekudzika kuti ape madhiraivha emota, zvinhu zvinodziya, mwenje, uye anonzwira tsitsi otomatiki network. Kana NEV ikatanga mukati kana pasi peKabhineti reKugovera Masimba, inoshatisa kunaka kwemagetsi chinyararire, inokanganisa kufambiswa kwemashoko edhijitari, inokonzeresa nzendo dzemidziyo isina kutsanangurwa, inomhanyisa kuputsika kwekudzivirira, uye inopa njodzi dzakakomba dzekuchengetedza vashandi.
Kunzwisisa kuti NEV inomuka sei, tichiziva zviratidzo zvayo zvemuviri uye zvedhijitari, uye kushandisa nzira dzakasimba dzekuongorora uye kudzikisira mukati meKabati reMagetsi ekugovera masimba maitiro akakosha ekuchengetedza kushanda kwakasimba, kwakachengeteka, uye kwakanaka.
Basics of Neutral-ku-Earth Voltage (NEV)
Kuti tinzwisise kuti sei kusimudza kwazvakarerekera{{0}kusvika{1}}ku{1}}magetsi epasi achikonzera kusagadzikana kwehurongwa, munhu anofanira kutanga aziva nheyo yemagetsi yezvikamu zvitatu-nhatu, ina{3}}mambure emagetsi ekugovera magetsi mumaindasitiri.
Iyo Ideal Electrical Baseline
Nenzira yakanaka-pase wye magetsi ekugadzirisa, nzvimbo yepakati petransformer yechipiri inomonereka inoumba imwe neutral reference point, iyo yakanyatso sungirirwa kune main ground grounding electrode. Mumamiriro ezvinhu akakwana-apo matatu-matanho akaremerwa ari pakati nepakati uye pasina-mitsetse yakaremerwa iripo-huwandu hwevheta hwemhepo inodzoka kuburikidza neiyo neutral conductor yakaenzana ne zero. Nekuda kweizvozvo, kuyera mutsauko unokwanisa pakati pebhazi risina kwarakarerekera uye bhazi rekudzika mukati meSimba Rekugovera Cabinet kunofanirwa kuburitsa kuverenga zero volts AC.
Neutral Voltage Drop vs. Dangerous Offsets
Mune{{0}kumisikidzwa kwemaindasitiri munyika, zero yechokwadi-volt inogoneka pakati pekusarerekera nepasi hazvigoneke kugadzirisa. Nekuti mhangura nealuminium neutral conductors vane inherent resistance uye inductive reactance, chero kudzoka ikozvino inoyerera ichidzokera kunzvimbo inoburitsa kudonha kwevoltage pamwe nehurefu hweasina kwaakarerekera conductor zvinoenderana nemutemo waOhm.
Uku kudonha kwemagetsi kunogadzira mutsauko unogona kuyerwa pakati peiyo isina kwayakarerekera terminal mukati meiyo localized Power Distribution Cabinet uye iri kure pasi pasi referensi. Nepo magetsi madiki ekubvisa anogadzirwa nemutoro wazvino uno uchitarisirwa, matambudziko anomuka kana mafambiro emhepo akawandisa, akanyanya kuwirirana, kana nzira dzakakwirira-dzinodzivirira dzikamo dzinosundidzira musiyano uyu kupfuura kushivirira kunogamuchirwa kwekushanda.
Regulatory Thresholds uye Industry Benchmarks
Mitemo yemagetsi yakajairika-yakadai seIEEE 1100 (Inokurudzirwa Maitiro eKusimba uye Grounding Electronic Equipment) nemitemo yeIEC yepasi rose-kazhinji inokurudzira kuti kugadzikana-kusava Neutral{4}}ku{5}}Earth Voltage pamapanel ekugovera ebazi nemagetsi emagetsi ari pasi pe2 AC0. yepamusoro-tekinoroji yemagetsi yakanangana nepamusoro pe1.0 volt AC.
Kana zviyero zveNEV mukati mePower Distribution Cabinet inokwira pamusoro pe3.0 kusvika 5.0 volts AC, madhijitari ekudzora network anotanga kusangana nekukanganisa kwekutaurirana kwenguva pfupi. Kana NEV ichidarika 10 volts AC, kuvhiringika kwakanyanya, kutadza kushanda kwehardware nguva isati yakwana, uye njodzi dzakakomba dzekuchengetedza magetsi zvinova pedyo.
Zvikonzero Zvekukwidziridzwa NEV muIndustrial Distribution Systems
Kukwidziridzwa kusina kwazvakarerekera-ku{1}}ku{1}}magetsi epasi haawanzobva pamhosva imwe chete. Pane kudaro, kazhinji kacho mhedzisiro yekusafamba zvakanaka kwekutakura zvinhu, zvemazuva ano-magetsi emagetsi emagetsi, kuchembera kwekabhati hardware, uye nepamusoro-soro yepasi.
Zvisina kuenzanisa-Phase Loads
Mumaindasitiri anogadzira mafesitiri, mahombe matatu-akadai semamota emagetsi anorema nemacompressor) anoshanda pamwe chete neakawanda-chikamu chinorema (sezvakaita sezvidzori zvekubatsira,{2}}pombi dzechikamu chimwe chete, magetsi anomhanyisa, uye macomputer workstations). Kana vanoisa maplanti vakabatanidza zvinhu zvakawanda zvakawandisa-paseg kugumbo rimwe chete mukati mePower Distribution Cabinet, vector equilibrium ye-phase phase system inoparara.
Iko kusaenzana kwazvino kunokonzeresa hakuna imwe nzira kunze kwekudzokera kune transformer sosi kuburikidza neakarerekera conductor. Sezvo iyi yakakwirira yekudzoka ikozvino inomanikidza nzira yayo kuburikidza nekwakarerekera bhazi uye tambo dzekugovera, inogadzira yakaenzana voltage inodonha pamutsara, ichityaira kukwira kwevoltage inogoneka pane isina kwayakarerekera terminal inoenderana nepasi pasi.
Yakakwira-Frequency Harmonics Inofambiswa Nevasina{1}}Linear Loads
Kuwandisa-kwemagetsi emagetsi asiri emagetsi munzvimbo dzemaindasitiri emazuva ano ndiwo mutyairi mukuru weNEV yakaoma. Midziyo yakaita seVariable Frequency Drives (VFDs), inoshanda kumberi-kumagumo emagetsi emagetsi, akachinja-modhi yemagetsi, maplanti emagetsi, nemagetsi emagetsi eLED anodhirowa kamwe kamwe, asiri{4}}sinusoidal pulses pane kutsvedzerera, anoenderera mberi sine masaisai.
Mapuruzi aya anoburitsa mafambiro anowirirana-kunyanya katatu (3rd, 9th, 15th, 21st, uye maodha epamusoro). Kusiyana nekukosha kwe60Hz kana 50Hz, iyo inodzima imwe neimwe muchikamu chetatu-pasesitimu, katatu maharonic currents anowedzera zvinovaka pane neutral conductor. Muzvivakwa zvakanyanya otomatiki, kwayakarerekera ikozvino inotungamirwa neharmonics inogona chaizvo kudarika yakazara yakayerwa chikamu chazvino chehurongwa. Uku kuyerera kukuru,{11}}kunoita kuti magetsi adzike zvakanyanya mukati meiyo Power Distribution Cabinet, zvichikonzera kusarerekera kwakanyanya{12}}ku{13}}kukwira kwemagetsi epasi.
Yakakwira-Resistance Neutral Connections uye Corrosion
Kushatisa kwemidziyo yemuviri mukati memuvharo wemagetsi ndechimwe chinokonzera kazhinji. Nzvimbo dzemaindasitiri dzinowanzo ratidzwa kune inorema mechani vibrations kubva kumichina yakavakidzana, ambient thermal cycling (kupisa pasi pemutoro uye kutonhora panguva yekuvhara), uye inoparadza utsi hwemuchadenga kana hunyoro.
Nekufamba kwenguva, aya masimba ane simba anokonzera anorema terminal screws, neutral busbar lug bolts, uye main feed connections kusunungura, oxidize, kana corrode. Rombo rakasununguka rinogadzira nzvimbo yakakwirira-inopikisa. Sekuedza kwazvino uno kuyedza kuyambuka chipingamupinyi ichi chinodzivirira, kudonhedza kwemagetsi kwenzvimbo kunokura pakubatanidza pachayo, kukwidza iyo yese yakadzika isina kwayakarerekera busbar kune ine njodzi inogona kuitika pamusoro pevhu.
Zvisina kufanira Grounding Architectures uye Ground Loops
Zvisizvo zvekugadzika zvigadziriso zvinowanzowedzera nyaya dzisina kwayakarerekera. Makodhi emagetsi enyika anorayira kuti conductor isina kwayakarerekera isungirwe pasi panodzivirira panzvimbo imwe chete-kazhinji pamusuwo wesevhisi yepuraimari kana kuti painotenderedzwa nhanho imwe yega{2}}inodzika netransformer.
Kana-zvichireva nyanzvi vakaisa netsaona yechipiri isina kwayakarerekera{1}ku{2}ku{2}}ground jumper bond mukati mezasi kwerwizi-tier kugovera magetsi makabhati, vanogadzira nzira dzekudzoka dzakafanana dzeneutral current. Parizvino kupatsanurwa pakati peyakagadzirirwa kusarerekera conductor uye inodzivirira yepasi network, inosimbisa midziyo chassis, simbi conduits, uye kabati mafuremu munzvimbo yese ine inorasika voltage.
Operational Impact pane Industrial Equipment uye Vashandi
Kana magetsi asina kwaakarerekera{-ku{1}}panyika akwira asina kuchekwa mukati meKabhineti Rekugovera Masimba, zvinoparadza zvinotekeshera munzvimbo yese yekugadzira, zvichikanganisa kurongeka kwedhijitari, hardware, uye kuchengetedzwa kwevanhu.
Equipment Kusashanda uye Huori hweKukurukurirana
Mitsetse yemazuva ano yekugadzira zvinhu inoenderana ne-zvinomhanyisa dhijitari-zvakadai seEthernet/IP, Profinet, Modbus, neRS-485 serial loops-kupa mirairo yenguva chaiyo pakati peProgrammable Logic Controllers (PLCs), sensor arrays, uye mamodule eI/O ari kure. Matransceivers pamakadhi aya ekutaurirana edhijitari anoshandisa mareferensi enzvimbo yepasi kusiyanisa pakati pepamusoro (binary 1) uye yakaderera (binary 0) voltage pulses.
Kana NEV yakasimudzwa ichipa simba kunetiweki yepasi, inoita-ruzha rwemodhiyo yakajairika inopinda mureferensi yetambo dzemasaini. Iwo ma transceivers edhijitari haachakwanise kududzira nemazvo mabhiti e data anouya, achitungamira kune akashatiswa data pakiti, kupindirana kwe "phantom" sensor kukanganisa, kamwe kamwe muchina kumira kwechimbichimbi, uye kuvharika kusingatsananguriki kuvharika kunoomesa kugadzirwa.
Premature Component Kukundikana uye Thermal Stress
Yakakwidziridzwa NEV uye yakabatana yakakwira isina kwayakarerekera ikozvino inogadzira yakanyanya kupisa kushushikana mukati mekugovera Hardware. Kuwedzeredza kwazvakarerekera parizvino kunokonzeresa kukurumidza kupisa kupisa mukati mekusarerekera mabhazi, materminal blocks, uye tambo dzekudyisa mukati mePower Distribution Cabinet.
Kupisa kwakanyanya uku kunonyungudutsa tambo yekuvharisa, inomhanyisa kushatiswa kwedzimba dziri pedyo, uye kukuvadza zvinhu zvemagetsi zvakaiswa padhuze neDIN njanji. Pamusoro pezvo, high harmonic frequencies inomhanya nepakati pedunhu redunhu inokonzera kurasika eddy mafungu munzvimbo dzakatenderedza simbi dzakavharirwa mapaneru, zvichikonzera kudziya kwenzvimbo yekupisa uye kutadza kuchinjika kweshanduko nguva isati yakwana.
Nengozi Yekuchengetedzwa Kwevashandi
Kuchengetedzwa kwevashandi kunomiririra kunetseka kwakanyanya kwakatenderedza yakakwira NEV. Kana ikozvino yapinda mumanetiweki epasi nekuda kwepasi pamutemo-mabhondi epasi kana kudzima magetsi akanyanya, simbi yakavharirwa yePower Distribution Cabinet, simbi yekuvaka yakabatana, nemafuremu emuchina anosimbiswa nemagetsi arasika.
Mushandi anobata furemu yekabati ine simba panguva imwe cheteyo akamira pauriri hwekongiri yakanyorova kana kuti akabata simbi yakatsikwa pasi anopedzisa kutenderera kwemagetsi, achiwana kubata kusingatarisirwe-voltage shock. Muzviitiko zvakakwirira-zvisina mhosva, NEV yakasimudzwa inogonawo kukanganisa kudzivirira kwevanopwanya masekete panguva yezviitiko zvepasi, zvichiwedzera njodzi yekuputika kwearc flash panguva yekufona kwemaitiro ekugadzirisa.
Mitigation, Diagnostic, uye Prevention Strategies
Kugadzirisa nyaya dzeNEV kunoda nzira yakarongeka inosanganisa kuongororwa kwakaringana kuyedzwa, kuyera mapaneru, kusefa kweharmonic, uye kuomerera kumitemo yekumisa magetsi.
Systemic Load Balancing
Danho rekutanga kudzikamisa NEV mukati meKabhineti Yekugovera Masimba nderekuita wongororo yemazuva ano pamakumbo ese ari kuuya uchishandisa -RMS clamp meter kana kuti -channel power quality analyzer.
Kana masekete ebazi rimwe-akagoverwa zvisina kuenzana, vanogadzira magetsi vanofanira-kupa kubatanidza sedunhu remapazi pamativi materminals kuti vaenzanise mutoro wazvino uno zvakanyanya sezvinobvira. Kuenzanisa nhanho dzenhanho dzinoderedza zvakanyanya kusarerekera kudzoka ikozvino, nekukasira kudzikisa kudonha kwevoltage munzira isina kwayakarerekera.
Harmonic Suppression uye Isolation Transformers
Kana-mitoro isina mutsara inofamba katatu, kureruka kwekutakura hakuna kukwana. Zvivako zvinofanirwa kuendesa yakasarudzika harmonic kudzvinyirira maitiro:
K-Factor and Zig-Zag Transformers: Kuisa delta-wye isolation transformer kana yakazvipira zig-zag grounding transformer yakananga kumusoro kwePower Distribution Cabinet inoteya maharmonics akapetwa katatu mukati me delta primary windings, zvichidzivirira yakakwirira-kuyerera kubva mukuyerera zvichikwira kumusoro.
Active Harmonic Filters (AHFs): AHFs inotarisisa maharmonic currents pamutsetse-nguva chaiyo uye jekiseni counter-phase harmonic currents mu neutral busbar, kukanzura kusiri{2}}kukanganiswa kwemutsara uye kudzoreredza yakachena, yakati sandara isina kwayakarerekera.
Cabinet Maintenance uye Connection Torquing
Kudzivirirwa kwekuchengetedza kwemuviri kwePower Distribution Cabinet kwakakosha pakubvisa resistive neutral offsets. Zvikwata zvekugadzirisa zvinofanirwa kutanga nguva nenguva zvinopisa zvinovheneka zvichishandisa infrared makamera kuona nzvimbo dzinopisa zvisingaite pamabhazi asina kwaakarerekera, kumiswa kwemalug, uye main breakers.
Panguva yekudzimwa kweplanti kwakarongwa, nyanzvi dzinofanira kushandisa macalibrated torque wrenches kudzoreredza-kutemesa masiruuru ese kune zvakatemwa nefekitari, kubvisa chero oxidation yenzvimbo uye kuisa anti{1}}corrosion conductive paste kualuminium{2}ku{3}kusangana kwemhangura.
Grounding Verification uye Single{{0}Point Integrity
Chekupedzisira, vanamakanika vanofanira kunyatsoongorora mavakirwo epasi kuti vave nechokwadi chechokwadi chimwe chete-chinzvimbo chisina kwazvakarerekera{1}}pasi bonding kuperera:
Ongorora mukati meiyo yega yega Power Distribution Cabinet kuti uone kuti iyo bhazi isina kwayakarerekera inoramba iri yega kubva kune simbi yakavharirwa chassis uye inodzivirira pasi pasi busbar.
Bvisa chero zvisina kwazvakarerekera zvisina kubvumidzwa-ku-ground jumper links dziri pasi pepanopindwa napo kana transfoma yekuzviparadzanisa nevamwe.
Wona kuti yakachena, yakatsaurirwa michina yekumisa conductor inomhanya yakananga padivi pechikamu uye tambo dzisina kwazvakarerekera mukati meimwe simbi conduit kudzivirira kurasika inductive zvishwe.
Mhedziso
Kusarerekera-ku{1}}nyaya dzemagetsi epasi idambudziko rakakura, rinowanzozivikanwa zvisizvo kumaindasitiri echizvino-zvino. Zvichitungamirirwa nekusaenzana-nechikamu chimwe chete chekusaenzana, kukanganisa kweharmonic kubva kune zvisiri-magetsi emagetsi emagetsi, akakwirira-makonesheni ekuramba, uye mabhondi epasi pechipiri asina kufanira, akakwidziridzwa NEV anokanganisa chinyararire kuvimbika kwehurongwa uye kuchengetedzwa kwesaiti.
Senzvimbo yepakati tsinga yemaindasitiri emagetsi network, iyo Power Distribution Cabinet inoshanda seyese nzvimbo yekutanga uko aya ma neutral voltage anomalies anoratidza uye nzvimbo yepamusoro panofanirwa kushandiswa masimba anoshanda.
Nekushandisa nguva dzose infrared thermal inspection, kumanikidzira kuomesera-maitiro ekuenzanisa, kuisa harmonic sefa hardware, kuchengetedza chaiwo busbar torque, nekuchengetedza imwe chete-point neutral grounding integrity, mamaneja ezvemaplanti nemainjiniya emagetsi anogona kubudirira kubvisa zvinhu zvine ngozi zvisina kwazvakarerekera. Kudzora kwazvakarerekera-ku-voltage yepasi kunovimbisa masaini ekudzora akadzikama, inochengetedza gadziriro yemagetsi akakosha, inodzivirira kuderera kwemagetsi kusingatarisirwe, uye kunovimbisa nharaunda yekushanda yakachengeteka yevashandi vezvemafekitari.