What is the most serious failure of high-voltage motors?

Muaj ntau qhov laj thawj rau qhov tsis ua haujlwm ntawm AC high-voltage motors. Vim li no, nws yog ib qho tsim nyog yuav tsum tshawb nrhiav cov txheej txheem kev teeb tsa thiab kev daws teeb meem meej rau ntau hom kev ua tsis tiav, thiab nthuav tawm cov kev tiv thaiv zoo los tshem tawm cov kev ua tsis tiav hauv cov tshuab hluav taws xob hauv lub sijhawm. , yog li ntawd qhov tsis ua hauj lwm ntawm high-voltage motors yog txo xyoo los ntawm xyoo.

Dab tsi yog qhov yuam kev ntawm high-voltage motors? Lawv yuav tsum tau ua li cas?

1. Lub cev muaj zog cua txias tsis ua haujlwm

Kev soj ntsuam tsis tiav

Vim yog cov kev xav tau ntau lawm, high-voltage motors pib nquag, muaj kev vibrations loj, thiab muaj cov neeg kho tshuab loj, uas tuaj yeem yooj yim ua rau lub cev muaj zog cua txias ua haujlwm tsis zoo. Qhov no feem ntau suav nrog cov hauv qab no:

Ua ntej,cov yeeb nkab txias sab nraud ntawm lub cev muaj zog raug puas ntsoog, ua rau poob ntawm qhov cua txias nruab nrab, uas nyob rau hauv lem txo cov cua txias peev xwm ntawm high-voltage motor txias system. Lub peev xwm txias yog thaiv, ua rau lub cev muaj zog kub nce;

Thib ob,Tom qab cov dej txias deteriorates, cov kav dej txias yog corroded thiab thaiv los ntawm impurities, ua rau lub cev muaj zog overheat;

Peb,qee cov kav dej txias thiab cua sov dissipation muaj qhov yuav tsum tau ua rau cov cua sov dissipation muaj nuj nqi thiab thermal conductivity. Vim qhov sib txawv shrinkage degrees ntawm cov khoom ntawm cov khoom sib txawv, qhov khoob yog sab laug. Teeb meem ntawm oxidation thiab xeb tshwm sim ntawm qhov sib koom ua ke ntawm ob, thiab cov dej txias nkag mus rau hauv lawv. Raws li qhov tshwm sim, lub cev muaj zog yuav muaj "kev tua" kev sib tsoo, thiab lub cev muaj zog yuav nres, ua rau lub cev muaj zog tsis ua haujlwm zoo.

Kho txoj kev

Saib xyuas cov kav dej txias sab nraud kom txo qhov kub ntawm cov kav dej txias sab nraud.Txhim kho qhov zoo ntawm cov dej txias thiab txo qhov tshwm sim ntawm impurities hauv cov dej txias corroding kav thiab thaiv cov cua txias.Lubricant tuav nyob rau hauv lub condenser yuav txo qhov kub dissipation tus nqi ntawm lub condenser thiab txwv tsis pub khiav ntawm cov kua refrigerant.Raws li kev pom ntawm cov xau ntawm aluminium sab nraud cov kav dej txias, qhov kev sojntsuam ntawm lub tshuab nqus dej txav ze rau txhua qhov tuaj yeem xau. Ntawm qhov chaw uas yuav tsum tau kuaj xyuas, xws li cov pob qij txha, welds, thiab lwm yam, lub kaw lus rov ua haujlwm dua kom tus neeg saib xyuas cov dej xau tuaj yeem siv dua. Lub hom phiaj tiag tiag yog los txais yuav txoj kev saib xyuas ntawm stamping, stuffing thiab sealing.Thaum ua haujlwm ntawm qhov chaw, cov kua nplaum yuav tsum tau siv rau hauv qhov chaw tawm ntawm aluminium sab nraud cua txias yeeb nkab ntawm high-voltage motor, uas tuaj yeem tiv thaiv kev sib cuag ntawm cov hlau thiab txhuas thiab ua tiav cov nyhuv oxidation zoo.

2. Lub cev muaj zog rotor tsis ua haujlwm

Kev soj ntsuam tsis tiav

Thaum lub sij hawm pib thiab overload lub cev muaj zog, nyob rau hauv tus ntawm ntau yam quab yuam, lub luv luv-circuit nplhaib ntawm lub internal rotor ntawm lub cev muaj zog yog welded mus rau lub tooj liab sawb, ua rau cov tooj liab sawb ntawm lub cev muaj zog rotor maj mam loosen. Feem ntau, vim hais tias lub nplhaib kawg tsis yog forged los ntawm ib daim ntawm tooj liab, Lub vuam seam tsis zoo welded thiab tej zaum yuav yooj yim ua rau tawg vim thermal stress thaum lub sij hawm ua hauj lwm.Yog tias cov tooj liab thiab cov tub ntxhais hlau tsis sib haum dhau lawm, cov tooj liab yuav co hauv qhov zawj, uas yuav ua rau lub nplhaib tooj liab lossis lub nplhaib kawg tawg.Tsis tas li ntawd, cov txheej txheem kev teeb tsa tsis tau ua tiav zoo, uas ua rau muaj qhov cuam tshuam me ntsis ntawm qhov chaw ntawm cov hlua hlau. Yog hais tias lub tshav kub tsis tuaj yeem dissipated hauv lub sijhawm, nws yuav ua rau muaj kev nthuav dav thiab deformation, ua rau lub rotor vibration kom hnyav.

Kho txoj kev

Ua ntej ntawm tag nrho cov, vuam breakpoints ntawm high-voltage motor rotor yuav tsum tau soj ntsuam, thiab cov khib nyiab nyob rau hauv lub qhov tseem ceeb yuav tsum tau ua tib zoo ntxuav. Feem ntau xyuas seb puas muaj cov kab tawg, cov kab nrib pleb thiab lwm yam tsis xws luag, siv cov khoom siv tooj liab los welding ntawm cov vuam tawg, thiab nruj tag nrho cov ntsia hlau. Tom qab ua tiav, kev ua haujlwm ib txwm yuav pib.Ua ib qho kev soj ntsuam ntxaws ntxaws ntawm rotor winding kom tsom mus rau kev tiv thaiv. Thaum pom, nws yuav tsum tau hloov nyob rau hauv lub sij hawm kom tsis txhob muaj kev kub nyhiab ntawm cov tub ntxhais hlau.Tsis tu ncua xyuas qhov xwm txheej ntawm cov tub ntxhais zawm bolts, rov nruab lub rotor, thiab ntsuas cov tub ntxhais poob yog tias tsim nyog.

3. High-voltage motor stator coil tsis ua hauj lwm

Kev soj ntsuam tsis tiav

Ntawm cov high-voltage motor faults, faults tshwm sim los ntawm kev puas tsuaj rau lub stator winding rwb thaiv tsev account rau ntau tshaj 40%.Thaum lub tshuab hluav taws xob high-voltage pib thiab nres sai lossis hloov pauv sai, kev vibration tshuab yuav ua rau cov tub ntxhais stator thiab stator winding txav mus rau ib leeg, ua rau kev puas tsuaj vim thermal degradation.Qhov nce hauv qhov kub thiab txias ua rau qhov tsis zoo ntawm qhov rwb thaiv tsev thiab hloov cov xwm txheej ntawm cov rwb thaiv tsev, yog li ua rau muaj kev hloov pauv cuam tshuam txog cov xwm txheej ntawm cov rwb thaiv tsev.Vim cov roj, dej vapor thiab av nyob rau ntawm qhov chaw winding thiab tawm ntawm cov theem sib txawv ntawm stator winding, cov xim liab los tiv thaiv halo nyob rau saum npoo ntawm high-voltage lead rwb thaiv tsev txheej ntawm qhov sib cuag tau tig mus rau hauv cov xim dub.Lub high-voltage lead feem tau soj ntsuam thiab pom tias qhov tawg ntawm cov hlau lead hauv high-voltage yog nyob ntawm ntug ntawm stator ncej. Kev ua haujlwm txuas ntxiv nyob rau hauv qhov chaw ntub dej ua rau muaj kev laus ntawm cov txheej txheem rwb thaiv tsev ntawm high-voltage lead hlau ntawm stator winding, uas ua rau txo qis hauv rwb thaiv tsev tsis kam ntawm winding.

Kho txoj kev

Raws li kev tsim kho ntawm qhov chaw, qhov siab-voltage lead seem ntawm lub cev muaj zog winding yog thawj zaug qhwv nrog insulating daim kab xev.Raws li cov txheej txheem "hanging handle" feem ntau siv los ntawm kev saib xyuascov kws hluav taws xob, maj mam nqa lub sab sauv ntug ntawm faulty coil 30 mus rau 40 mm deb ntawm lub puab phab ntsa ntawm stator core thiab sim kho nws.Siv ib qho yooj yim ci clamp los pib clamp qhov tshiab qhwv cov ntaub qhwv, siv cov hmoov mica daim kab xev rau ib nrab-pob qhov ncaj seem ntawm cov txheej sab sauv los ntawm hauv av rau 10 mus rau 12 txheej, thiab tom qab ntawd qhwv lub qhov ntswg ntawm ob sab ntawm Lub qhov nyob ib sab ntawm qhov coil rau insulate nws los ntawm hauv av, thiab lub bevel ntug ntawm lub coil kawg Siv high-resistance semiconductor xim rau cov seem nrog txhuam ntev ntawm 12 hli.Nws yog qhov zoo tshaj plaws kom sov thiab txias ob zaug txhua.Tighten tus tuag screws dua ua ntej cua sov rau zaum ob.

4. Cov kabmob tsis ua haujlwm

Kev soj ntsuam tsis tiav

Sib sib zog nqus groove pob bearings thiab cylindrical roller bearings yog feem ntau siv nyob rau hauv high-voltage motors. Lub ntsiab yog vim li cas rau lub cev muaj zog bearing tsis ua hauj lwm yog tsis tsim nyog installation thiab tsis ua hauj lwm rau nruab raws li cov kev cai coj.Yog tias cov roj nplua nyeem tsis tsim nyog, yog tias qhov kub thiab txias tsis zoo, qhov kev ua haujlwm ntawm cov roj kuj tseem hloov pauv ntau.Cov xwm txheej no ua rau cov kabmob muaj teeb meem thiab ua rau lub cev tsis ua haujlwm.Yog tias lub coil tsis ruaj khov, lub kauj thiab cov tub ntxhais hlau yuav vibrate, thiab qhov chaw bearing yuav dais axial load ntau dhau, uas yuav ua rau cov kabmob hlawv tawm.

Kho txoj kev

Tshwj xeeb bearings rau motors muaj xws li qhib thiab kaw hom, thiab cov kev xaiv tshwj xeeb yuav tsum tau ua raws li qhov tseeb.Rau cov bearings, tshwj xeeb clearance thiab roj yuav tsum tau xaiv. Thaum txhim kho cov kabmob, xyuam xim rau kev xaiv ntawm lubrication. Qee zaum roj nrog EP additives yog siv, thiab cov roj nyias nyias tuaj yeem siv rau ntawm lub tes tsho sab hauv. Roj tuaj yeem txhim kho lub neej ua haujlwm ntawm lub cev muaj zog bearings.Xaiv cov bearings kom raug thiab siv cov bearings kom raug kom txo tau qhov radial clearance ntawm cov kabmob tom qab kev teeb tsa thiab siv lub nplhaib sab nrauv sab nrauv los tiv thaiv nws.Thaum sib sau ua ke lub cev muaj zog, nws tseem yuav tsum tau ua tib zoo xyuas qhov sib luag ntawm cov kabmob thiab lub rotor ncej thaum txhim kho cov kabmob.

5. Rwb thaiv tsev tawg

Kev soj ntsuam tsis tiav

Yog hais tias ib puag ncig yog noo thiab hluav taws xob thiab thermal conductivity tsis zoo, nws yog ib qho yooj yim ua rau lub cev muaj zog kub nce siab heev, ua rau cov roj hmab rwb thaiv tsev deteriorate los yog txawm tev tawm, ua rau kom loosen, tawg los yog txawm arc paug teeb meem. .Axial kev co yuav ua rau muaj kev sib txhuam ntawm lub coil nto thiab lub ncoo thiab cov tub ntxhais, ua rau hnav ntawm semiconductor anti-corona txheej sab nraum lub kauj. Nyob rau hauv cov xwm txheej hnyav, nws yuav ncaj qha rhuav tshem lub ntsiab rwb thaiv tsev, ua rau tawg ntawm lub ntsiab rwb thaiv tsev.Thaum lub tshuab hluav taws xob high-voltage tau damp, qhov kev tiv thaiv tus nqi ntawm nws cov khoom siv rwb thaiv tsev tsis tuaj yeem ua tau raws li qhov xav tau ntawm lub tshuab hluav taws xob siab, ua rau lub cev muaj zog; Lub tshuab hluav taws xob high-voltage tau siv ntev dhau lawm, txheej txheej tiv thaiv corrosion thiab cov tub ntxhais stator nyob rau hauv kev sib cuag tsis zoo, arcing tshwm sim, thiab lub cev muaj zog windings tawg, ua rau lub cev muaj zog thaum kawg ua haujlwm tsis zoo. ; Tom qab cov roj av sab hauv ntawm lub tshuab hluav taws xob high-voltage yog immersed nyob rau hauv lub ntsiab rwb thaiv tsev, nws yog ib qho yooj yim uas yuav ua rau luv luv Circuit Court ntawm lem ntawm stator coil, thiab lwm yam. .

Kho txoj kev

Rwb thaiv tsev thev naus laus zis yog ib qho ntawm cov txheej txheem tseem ceeb hauv kev tsim khoom thiab kev saib xyuas lub cev muaj zog.Txhawm rau kom muaj kev ruaj ntseg ntawm lub cev muaj zog rau lub sijhawm ntev, qhov kub ntawm cov rwb thaiv tsev yuav tsum tau txhim kho.Ib txheej thaiv ntawm cov khoom siv semiconductor lossis cov khoom siv hlau yog muab tso rau hauv cov rwb thaiv tsev tseem ceeb txhawm rau txhim kho qhov hluav taws xob faib raws qhov chaw.Kev ua tiav hauv av yog ib qho ntawm cov kev ntsuas tseem ceeb rau cov kab ke tiv thaiv electromagnetic cuam tshuam.

Dab tsi yog qhov loj tshaj tsis ua hauj lwm ntawm high-voltage motors?

1. Feem ntau ua txhaum ntawm high-voltage motors

Electromagnetic tsis ua hauj lwm

(1) Theem-rau-theem luv Circuit Court ntawm stator winding

Theem-rau-theem luv luv Circuit Court ntawm stator winding yog qhov txhaum loj tshaj plaws ntawm lub cev muaj zog. Nws yuav ua rau muaj kev puas tsuaj loj rau winding rwb thaiv tsev ntawm lub cev muaj zog nws tus kheej thiab hlawv cov tub ntxhais hlau. Nyob rau tib lub sijhawm, nws yuav ua rau txo qis hauv daim phiaj hluav taws xob, cuam tshuam lossis rhuav tshem lub zog siv ntawm lwm tus neeg siv.Yog li ntawd, nws yuav tsum tau tshem tawm lub faulty lub cev muaj zog sai li sai tau.

(2) Inter-tig luv luv Circuit Court ntawm ib theem winding

Thaum lub sij hawm winding ntawm lub cev muaj zog yog luv luv ntawm lem, qhov txhaum theem tam sim no nce, thiab cov degree ntawm tam sim no nce yog muaj feem xyuam rau cov xov tooj ntawm short-circuit lem. Lub inter-tig luv Circuit Court rhuav tshem cov kev ua haujlwm sib luag ntawm lub cev muaj zog thiab ua rau muaj cua sov hauv zos loj.

(3) Ib-theem grounding luv luv Circuit Court

Lub zog hluav taws xob network ntawm high-voltage motors feem ntau yog qhov nruab nrab ntawm qhov tsis ncaj qha hauv av. Thaum ib theem av txhaum tshwm sim nyob rau hauv lub high-voltage lub cev muaj zog, yog hais tias lub grounding tam sim no ntau tshaj 10A, lub stator core ntawm lub cev muaj zog yuav raug hlawv.Tsis tas li ntawd, ib qho kev ua txhaum hauv av ib-theem tuaj yeem txhim kho mus rau hauv qhov tig-rau-tig luv luv lossis theem-rau-theem luv luv. Nyob ntawm qhov luaj li cas ntawm cov av tam sim no, lub faulty lub cev muaj zog tuaj yeem raug tshem tawm los yog lub tswb nrov tuaj yeem muab tawm.

(4) Ib theem ntawm cov khoom siv hluav taws xob lossis stator winding yog qhib Circuit Court

Ib qho kev qhib Circuit Court ntawm ib theem ntawm cov khoom siv hluav taws xob lossis lub stator winding ua rau lub cev muaj zog ua haujlwm nrog theem poob, qhov kev ua haujlwm theem tam sim no nce, lub cev muaj zog kub nce siab, lub suab nrov, thiab kev vibration nce.Nres lub tshuab kom sai li sai tau, txwv tsis pub lub cav yuav hlawv.

(5) Lub hwj chim mov voltage siab dhau los yog qis dhau

Yog tias qhov hluav taws xob siab dhau lawm, qhov hluav taws xob sib nqus ntawm lub stator core yuav saturated, thiab tam sim no yuav nce sai; Yog hais tias qhov hluav taws xob tsawg dhau lawm, lub cev muaj zog torque yuav txo qis, thiab lub stator tam sim no ntawm lub cev muaj zog khiav nrog load yuav nce, ua rau lub cev muaj zog, thiab nyob rau hauv cov xwm txheej hnyav, lub cev muaj zog yuav hlawv.

mechanical tsis ua hauj lwm

(1) Cov kabmob hnav lossis tsis muaj roj

Cov kabmob tsis ua haujlwm tuaj yeem ua rau qhov kub thiab txias ntawm lub cev muaj zog thiab lub suab nrov kom nce. Hauv qhov xwm txheej hnyav, cov bearings yuav kaw thiab lub cev muaj zog tuaj yeem hlawv.

(2) Kev sib dhos tsis zoo ntawm lub cev muaj zog

Thaum sib sau ua ke lub cev muaj zog, cov ntsia hlau tuav tsis sib npaug thiab cov npog sab hauv thiab sab nrauv me me ntawm lub cev muaj zog rub tawm ntawm tus ncej, ua rau lub cev muaj zog kub thiab nrov.

(3) Kev sib txuas tsis zoo

Lub zog kis tau tus mob ntawm tus ncej nce qhov kub ntawm cov kabmob thiab ua rau muaj kev vibration ntawm lub cev muaj zog.Hauv qhov xwm txheej hnyav, nws yuav ua rau cov bearings puas thiab hlawv lub cev muaj zog.

2. Kev tiv thaiv ntawm high-voltage motors

Phase-rau-theem luv Circuit Court tiv thaiv

Ntawd yog, tam sim no ceev-so lossis longitudinal sib txawv tiv thaiv qhia txog theem-rau-theem luv Circuit Court txhaum ntawm lub cev muaj zog stator. Cov motors uas muaj peev xwm tsawg dua 2MW yog nruab nrog kev tiv thaiv ceev ceev tam sim no; cov motors tseem ceeb nrog lub peev xwm ntawm 2MW thiab siab dua lossis tsawg dua 2MW tab sis qhov kev tiv thaiv ceev ceev tam sim no tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua thiab muaj rau lub qhov hluav taws xob xaim tuaj yeem nruab nrog kev tiv thaiv ntev ntev. Cov theem-rau-theem luv-circuit tiv thaiv ntawm lub cev muaj zog ua rau tripping; rau synchronous motors nrog cov khoom siv tsis siv neeg demagnetization, kev tiv thaiv yuav tsum tau ua ntawm demagnetization.

Kev tiv thaiv tsis zoo tam sim no

Raws li kev tiv thaiv rau lub cev muaj zog inter-tig, theem tsis ua haujlwm, thim rov qab theem ib ntus thiab qhov loj ntawm qhov tsis sib npaug, nws kuj tuaj yeem siv los ua cov thaub qab rau lub ntsiab kev tiv thaiv ntawm peb-theem tam sim no tsis txaus ntseeg thiab cuam tshuam nrog luv luv Circuit Court txhaum ntawm lub cev muaj zog.Kev tiv thaiv tsis zoo tam sim no ua haujlwm ntawm kev mus los lossis teeb liab.

Ib theem av txhaum tiv thaiv

Lub hwj chim mov network ntawm high-voltage motors feem ntau yog ib tug me me tam sim no grounding system. Thaum ib theem grounding tshwm sim, tsuas yog grounding capacitor tam sim no ntws los ntawm qhov chaw txhaum, uas feem ntau ua rau muaj kev phom sij tsawg.Tsuas yog thaum cov av tam sim no ntau dua 5A, kev teeb tsa ntawm ib-theem grounding tiv thaiv yuav tsum tau txiav txim siab. Thaum lub grounding capacitor tam sim no yog 10A thiab siab dua, kev tiv thaiv tuaj yeem ua haujlwm nrog lub sijhawm txwv ntawm kev mus ncig; thaum lub grounding capacitance tam sim no qis dua 10A, kev tiv thaiv tuaj yeem ua haujlwm ntawm kev sib tw lossis teeb liab.Kev xaim thiab kev teeb tsa ntawm lub cev muaj zog ib-theem hauv av txhaum kev tiv thaiv yog tib yam li cov kab ib-theem hauv av txhaum kev tiv thaiv.

Tsawg voltage tiv thaiv

Thaum lub hwj huam mov voltage txo qis rau lub sijhawm luv luv lossis rov qab los tom qab kev cuam tshuam, ntau lub cev muaj zog pib nyob rau tib lub sijhawm, uas yuav ua rau qhov hluav taws xob rov qab tau ntev lossis txawm tias tsis zoo.Txhawm rau kom ntseeg tau tias nws tus kheej pib ntawm cov motors tseem ceeb, rau cov motors tsis tseem ceeb lossis cov txheej txheem lossis kev nyab xeeb, nws tsis raug tso cai rau nruab qis-voltage tiv thaiv ntawm tus kheej-pib motors nrog kev ua haujlwm qeeb ua ntej tripping..

Kev tiv thaiv overload

Lub sij hawm ntev overloading yuav ua rau lub cev muaj zog kub siab tshaj qhov kev tso cai, ua rau lub rwb thaiv tsev rau hnub nyoog thiab txawm ua rau tsis ua hauj lwm.Yog li ntawd, cov motors uas nquag mus dhau lub sijhawm ua haujlwm yuav tsum tau nruab nrog kev tiv thaiv overload.Nyob ntawm qhov tseem ceeb ntawm lub cev muaj zog thiab cov xwm txheej hauv qab uas tshwm sim dhau los, qhov kev txiav txim tuaj yeem raug teeb tsa, tsis siv neeg thauj khoom txo lossis tripping.

Lub sijhawm pib ua haujlwm ntev tiv thaiv

Cov tshuaj tiv thaiv lub cev muaj zog pib lub sij hawm ntev dhau lawm. Thaum lub sij hawm pib lub cev muaj zog tshaj lub sij hawm tso cai, kev tiv thaiv yuav mus.

Kev tiv thaiv overheating

Nws teb rau qhov nce hauv qhov zoo ib ntus tam sim no ntawm stator lossis qhov tshwm sim ntawm qhov tsis zoo raws li tam sim no tshwm sim los ntawm ib qho laj thawj, ua rau lub cev muaj zog overheat, thiab kev tiv thaiv ua haujlwm rau lub tswb lossis mus ncig. Overheating txwv tsis pub rov pib dua.

Stalled rotor kev tiv thaiv (zoo ib ntus tiv thaiv overcurrent)

Yog tias lub cev muaj zog raug thaiv thaum pib lossis khiav, qhov kev tiv thaiv yuav tawm mus. Rau synchronous motors, kev tiv thaiv tawm ntawm cov kauj ruam, tsis muaj kev tiv thaiv excitation thiab asynchronous tiv thaiv yuav tsum tau ntxiv.

Post lub sij hawm: Nov-10-2023