Yuav Ua Li Cas Zoo Txiav Qhib Qhov Ua Tsis Taus PTFE Rhaub rau Kev Tshawb Fawb Txog Kev Tshawb Fawb?

Ib tug $3,000 PTFE rhaub tau ua tsis tiav thaum ntxov thiab tus thawj tswj hwm xav paub vim li cas. Lub tshuab hluav taws xob tawg tsis yog tsuas yog cov khoom khib nyiab npaj yuav muab pov tseg. Nws yog cov ntaub ntawv kaw tseg ntawm nws qhov kub thiab txias, cov xwm txheej hluav taws xob, tshuaj tua kab mob thiab keeb kwm kev siv tshuab. Thaum lub rooj sib txoos ua tsis tau zoo raug tshuaj xyuas, txheej txheej los ntawm txheej, koj tuaj yeem kawm raws nraim li cas qhov kev puas tsuaj tshwm sim, thiab seb nws yog vim li cas rau kev teeb tsa, txheej txheem chemistry, kev tsim txom kev ua haujlwm, lossis kev tsim khoom sab hauv.

Kev tshawb nrhiav forensic ntawm PTFE lub tshuab rhaub tsis zoo hloov pauv cov khoom ua tsis tau zoo rau hauv cov cuab yeej kuaj xyuas muaj txiaj ntsig. Qhov xwm txheej ntawm PTFE sheath, MgO rwb thaiv tsev thiab cov hlau tsis kam nws tus kheej nthuav tawm cov lus zais ntawm cov sawn - qhib lub rhaub.

Yog vim li cas Failure Analysis nyob rau hauv Forensics Matters
Kev ua haujlwm tsis zoo ntawm lub tshuab hluav taws xob ntxov ntxov feem ntau ua rau muaj kev cuam tshuam loj hauv kev tsim khoom, tshwj xeeb hauv kev ua tshuaj, electroplating thiab semiconductor daim ntaub ntawv.

Yog tias koj tsis ua qhov zoo tshaj plaws - kev kuaj mob hauv tsev kho mob, lub tshuab hluav taws xob hloov pauv yuav ua tsis tau zoo tib yam vim tias qhov teeb meem hauv paus tsis tau kho.

Lub forensic dissection tuaj yeem pab txheeb xyuas:

Hluav taws xob arcing nyob rau hauv

Ingress ntawm noo noo

2. Tshuaj Corrosion

High watt ceev

Thaum tshav kub kub

Kev puas tsuaj hauv kev tsim khoom

Kev puas tsuaj thaum lub sij hawm installation

Incompatibility nyob rau hauv cov txheej txheem chemistry

Cov ntaub ntawv pov thawj uas tau sau tseg muab lub hauv paus rau kev txiav txim siab txog kev kho mob ntsig txog kev xaiv lub rhaub dej, cov txheej txheem kev ua haujlwm, kev tsim lub tank, lossis kev saib xyuas.

Kev Tiv Thaiv Kev Nyab Xeeb Ua ntej sib nrug
Cov txheej txheem no muaj kev phom sij thiab xav kom lub tshuab cua sov tas li de-energized thiab sib cais.

Muaj ntau cov txheej txheem kev nyab xeeb uas tseem ceeb ua ntej txiav pib.

Hluav taws xob cais
Lub tshuab cua sov yuav tsum tau muab tshem tawm tag nrho los ntawm txhua hom fais fab. Ua ntej kov, txheeb xyuas cov txheej txheem kaw tawm thiab tagout.

Cov cuab yeej tiv thaiv tus kheej
Kev txiav thiab tshuaj xyuas cov txheej txheem yuav tsum tau tsom iav kev nyab xeeb thiab lub ntsej muag plua plav.

Tso cov haujlwm txiav:

Plua plav particles ntawm PTFE

MgO rwb thaiv tsev plua plav.

Corrosion deposits

Fine hlau khib nyiab

Peb kuj pom zoo rau cov hnab looj tes tiv thaiv, vim tias cov npoo hlau txiav thiab cov ntaub qhwv tawg tuaj yeem ua tau ntse heev.

Ua haujlwm huv cheeb tsam
Qhov chaw kuaj huv huv tiv thaiv cov pov thawj thiab khaws cov khoom sab hauv los ntawm kev sib kis.

Lub teeb pom kev zoo yog qhov tseem ceeb vim qhov hloov xim me ntsis hauv cov rwb thaiv tsev feem ntau muab cov ntaub ntawv tseem ceeb xws li kev ua haujlwm tsis ua haujlwm.

Ua ntej, Kev Tshuaj Xyuas Sab Nraud
Sau cov ntaub ntawv ua tiav ntawm cov xwm txheej sab nraud ua ntej qhib lub rhaub.

Cov duab daws teeb meem siab yuav tsum muaj:

Tag nrho cov cua sov sib dhos

Terminal box xeev

Hlawv cov cim

Discoloration ntawm PTFE

Distortion los yog bloatedness

Cov qauv ntawm tshuaj tua kab mob

Tsim - ntawm cov txheej txheem residue

Kev tawg lossis kev puas tsuaj

Nco ntsoov sau cov ntawv sau, cov lej cim, lossis cov cim tsim khoom.

Cov ntaub ntawv thawj zaug no teev cov thawj lub xeev ua ntej qhov pib ntawm kev puas tsuaj.

Tshem tawm ntawm Terminal Box
Feem ntau qhov kev txiav tawm pib ntawm qhov hluav taws xob txiav tawm.

Ua tib zoo tshem tawm ntawm lub davhlau ya nyob twg enclosure qhia:

Fais fab connectors

Crimps rau hlau

Seals ntawm lub davhlau ya nyob twg

Rwb thaiv tsev Status (Internal)

Cov cim qhia txog kev ua kom sov lossis nkag ntawm cov dej noo

Corrosion nyob ib ncig ntawm lub terminals feem ntau yog ib qho cim ntawm vapor intrusion los yog ua txhaum cai foob.

Cov pa roj carbon tracing lossis cov khoom siv hluav taws xob tuaj yeem yog ib qho kev qhia ntawm kev sib txuas hluav taws xob tsis muaj zog lossis kev puas tsuaj ntawm rwb thaiv tsev.

Txiav rau hauv PTFE rhaub
Kev tswj kav ntev ntev raws li lub hauv paus hniav yog qhov tseem ceeb hauv kev soj ntsuam kev soj ntsuam ntawm cov txheej txheem PTFE ua tsis tiav.

Cov lus pom zoo ntawm cov cuab yeej txiav
Cov cuab yeej cuab tam yog:

Fine toothed hacksaw

Fine cutoff log

Rotary cuab tam nrog me me sib tsoo disc

Kev txhoj puab heev yuav tsum tsis txhob siv vim qhov kub kub tuaj yeem ua rau av nkos tsis ua haujlwm thiab cuam tshuam cov pov thawj.

Longitudinal Txiav Txheej Txheem
Feem ntau ib tug ua qeeb, ceev faj longitudinal txiav:

Hla ntawm thaj chaw txias

Mus rau hauv cheeb tsam kub, nce zuj zus

parallel nrog cov cua sov sab hauv

Qhov tob ntawm qhov txiav yuav tsum tau ua tib zoo tswj kom cov hlau hauv cov tub ntxhais lossis cov hlau tsis muaj kev puas tsuaj.

Nws yog raug, tsis yog kev puas tsuaj.

Lub PTFE sheath yuav tsum ua kom zoo li qhov ua tau, yog li kev sib cuam tshuam sab hauv ntawm cov khoom tseem yuav raug soj ntsuam.

Dawb txiav yam tsis muaj thermal puas
Qhov kev txiav yuav tsum tau qeeb thiaj li yuav txo tau qhov kev sib txhuam cua sov.

Thaum txiav overheating tuaj yeem yog:

PTFE nto yaj

Cov ntaub ntawv pov thawj rau smeared arc.

Hloov cov qauv oxidation

Disturb coloration MgO

Ua kom puas microfracture nta

Feem ntau, kev sib tshuam nrog kev ua kom txias txias ua rau muaj txiaj ntsig zoo dua.

PTFE Sheath Peeling Back
Lub longitudinal txiav yog tsim thiab PTFE sheath yog maj mam rub rov qab los yog sib cais kom nthuav tawm cov qauv sab hauv.

Sab hauv lub qhov cub qhib tuaj yeem yog:

Resistor hlau

Hlau tub ntxhais hlau

MgO insulating hmoov

Corrosion txoj kev

Scorched thaj ua rau thaj

Kev puas tsuaj cov qauv ntawm arcs

Qhov kev txiav- qhib lub rhaub tam sim no qhia peb nws cov lus zais sab hauv hauv qhov pom tseeb tshwj xeeb.

Tshawb nrhiav MgO rwb thaiv tsev
Qhov ntsuas tseem ceeb tshaj plaws nyob rau hauv lub rhaub yog magnesium oxide rwb thaiv tsev.

Ib txwm noj qab nyob zoo MgO hmoov yog:

BRILLIANT WHITE

Qhuav

Kev ntxhib los mos yog txawm

Kev hloov xim lossis kev ntxhib los mos feem ntau yog qhov cim ntawm kev nce qib hauv kev ua tsis tiav.

dawb MgO.
MgO feem ntau yog xim dawb huv thaum lub rwb thaiv tsev qhuav thiab tsis muaj paug hauv kev pabcuam.

MgO Grey los yog Dub
Darkened rwb thaiv tsev feem ntau txhais tau tias:

Overheating, hnyav heev

Internal hluav taws xob arcing

Carbonic acid

Burnout tshwm sim

arc zog tuaj yeem ua ib nrab sinter lossis fuse cov hmoov ze rau thaj tsam txhaum.

Ntsuab los yog Discolored MgO
Greenish discoloration yuav yog ib qho cim ntawm:

Tshuaj lom neeg.

Corrosion khoom

Kev nqus dej noo

Cov seem ntawm tooj liab oxide

Cov xim thiab kev mob ntawm MgO hmoov yog cov cim tseem ceeb ntawm ob qho tib si overtemperature mob thiab ib puag ncig nkag.

Kev ntsuas kev tiv thaiv kab mob
Qhov xwm txheej ntawm cov hlau tsis kam nws tus kheej feem ntau qhia txog lub ntsiab lus tsis ua haujlwm.

Mechanical brake Clean
Kev puas tsuaj huv si tuaj yeem yog ib qho cim ntawm:

Thermal qaug zog

Kev vibration

Mechanical embrittlement

Rov ua dua thiab nthuav dav tuaj yeem maj mam ua kom cov hlau tsis muaj zog kom txog thaum nws poob.

Fused los yog Balled Ends
Feem ntau qhov sib npaug lossis kub hnyiab hlau kawg qhia tias:

Arcing, Electro -

High tam sim no burnout

Localized overheating

Cov chaw zoo li no feem ntau tshwm sim los ntawm cov cim qhia ntawm kev tawg sai thiab khov kho.

Oxidised thiab Thinned Areas
Ib feem ntawm cov hlau tsis muaj zog yog feem ntau yog ib qho nkig hlau seem nrog rau qhov kub kub mus tas li.

Tej yam ua tau muaj xws li:

High watt ceev

Nplai tsim

Kev hloov pauv tsis zoo

Ib nrab qhuav- tua

Thaum lub sij hawm oxidation nce, txoj kab uas hla ntawm cov hlau txo. Thaum kawg nws tawg.

Advanced Laboratory Analysis
Qee qhov kev tshawb fawb tseem ceeb hauv kev lag luam yuav xav tau kev kuaj xyuas qib tom qab kev txiav tawm.

Kev tshuaj ntsuam xyuas electron microscopy (SEM).
Qhov tawg ntawm cov hlau tsis muaj zog tuaj yeem kawm hauv cov ntsiab lus tshwj xeeb nrog lub tshuab ntsuas hluav taws xob (SEM).

Kev txheeb xyuas SEM tuaj yeem nthuav tawm:

Striations Fatigue

Ntxoov Ntxawg Yaj

Intergranular corrosion kuj

Arc-kev sib hloov qauv

Metalurgical flaws

Xws li kev tsom xam muaj txiaj ntsig tshwj xeeb yog tias nws cuam tshuam nrog kev lees paub lossis rov ua tsis tiav.

Chemical Residue Testing
Cov nyiaj tso cia kuj tseem muaj nyob hauv lub rhaub.

Spectrographic Examination

Kev txheeb xyuas cov khoom siv corrosion

Kev kuaj rau ionic paug

Cov tswv yim no tuaj yeem paub meej tias muaj kev sib kis ntawm ib puag ncig lossis txheej txheem tshuaj lom neeg.

Kev sib txuas lus cov txiaj ntsig
Qhov no yuav tsum yog ib qho kev kawm tsis raug zoo nrog cov ntaub ntawv pov thawj tag nrho ntawm txhua kauj ruam.

Cov ntaub ntawv yooj yim yuav yog:

Sab nraud cua sov lub xeev

Terminal tshuaj xyuas.

Cov ntu ntev.

Exposed thaj chaw ntawm MgO

Hlau tawg cov ntsiab lus

Cov cim qhia ntawm arc puas

Corrosion txoj kev

Daim ntawv tshaj tawm zaum kawg feem ntau txheeb xyuas:

Main tsis ua hauj lwm hom

Lwm yam uas ua rau muaj kev nce qib no yog

Qhov kev puas tsuaj

Pom zoo ntsuas ntsuas

Piv txwv ntawm cov lus qhia kho yog:

Tsawg watt ceev

Cov av zoo dua

Txhim kho chemical compatibility

Txhim kho noo noo sealing

Cov kev hloov hauv cov txheej txheem ua haujlwm

Hloov chaw tso cua sov

Cov ntsiab lus
Ib txoj hauv kev zoo thiab zoo-cov ntaub ntawv pov tseg ntawm lub tshuab hluav taws xob PTFE tawg ua rau kev ua haujlwm tsis zoo rau hauv qhov tseem ceeb ntawm kev paub txog engineering. Cov neeg tshawb xyuas tuaj yeem ua tib zoo thiab maj mam qhib lub rhaub kom kuaj xyuas PTFE sheath, MgO rwb thaiv tsev thiab cov hlau tsis kam rau cov pov thawj ntawm arcing, corrosion, overheating, qaug zog los yog tsim teeb meem.

Kev tshawb nrhiav kev tshawb fawb txog kev tshawb nrhiav PTFE ua tsis tiav tau txais lub hauv paus tiag tiag ntawm lub tshuab cua sov ua ntej ntxov thiab muab kev pom tseem ceeb rau nws. Kev daws teeb meem ntawm cov duab thaij duab thiab kev kuaj xyuas lub cev kom zoo, nrog rau SEM tsom xam thaum tau lees paub, muab cov kev txhais cov cuab yeej cais tawm mus rau hauv kev txhim kho cov txheej txheem tseem ceeb.

Txhua lub rhaub ua tsis tau zoo muaj ib zaj dab neeg hauv nws lub plhaub. Txhua qhov kev ua tsis tiav muaj ib zaj lus qhia hauv nws, yog tias koj saib xyuas txaus los khawb hauv.