Kuv puas tuaj yeem paub qhov laj thawj rau cov khoom siv hluav taws xob kub hauv lub hwj huam hluav taws xob capacitors?

1. Loose Connections (Qhov #1 Ua rau)

Qhov no yog tam sim no feem ntau yog vim li cas.

Yog vim li cas nws tshwm sim:Thaum lub sij hawm, vim thermal cycling (kub thaum loaded thiab txias cia thaum tawm), vibrations, los yog tsis tsim nyog pib torque, lub davhlau ya nyob twg kev twb kev txuas yuav xoob.

Yog vim li cas nws ua rau kub:Ib qho kev sib txuas xoob tsimhluav taws xob tsis kamntawm qhov chaw tiv tauj. Raws li Joule txoj cai lij choj (Heat =} I²R), txawm tias qhov nce me me ntawm qhov tsis kam (R) ua rau muaj kev nce siab hauv cov cua sov, tshwj xeeb tshaj yog vim qhov tam sim no capacitor (I) tuaj yeem ua tau ntau heev.

Lub Vicious Cycle:Thaum tshav kub kub generated ntxiv oxidizes thiab degrades qhov kev sib cuag nto, ua kom tsis kam ntxiv, uas ua rau kub ntau. Qhov no tuaj yeem ua rau melting, arcing, thiab ua tsis tiav.

 

2. Harmonic Currents

Yog vim li cas nws tshwm sim:Tsis yog - cov khoom tawm (xws li VFDs, SMPS, LED tsav tsheb) kos cov kev sib raug zoo tam sim no. Fais fab tuag capacitors muaj impedance tsawg heev ntawm cov zaus ntau dua (harmonics), yog li lawv tuaj yeem nyiam thiab nthuav dav cov kev sib haum xeeb loj.

Yog vim li cas nws ua rau kub:Cov kev sib haum xeeb ntxiv no ntxiv rau qhov tseem ceeb 50/60 Hz tam sim no, ua rausiab dua tag nrho RMS tam sim nontws los ntawm cov terminals thiab lub capacitor nws tus kheej. Qhov nce tam sim no ncaj qha ua rau cov cua sov siab dua (dua, Kub ∝ I²).

 

3. Overcurrent Conditions

Yog vim li cas nws tshwm sim:Qhov no tuaj yeem yog vim:

Qhov System Overvoltage:Capacitor tam sim no yog proportional rau voltage (I=V / Xc). Ib qho hluav taws xob siab tshaj qhov capacitor qhov ntsuas hluav taws xob ua rau muaj qhov tam sim no ntau dhau.

Tshaj Capacitance:Yog tias ntau lub tsev txhab nyiaj capacitor hloov pauv, lossis yog tias cov khoom siv hluav taws xob detuned (siv los tiv thaiv kev sib haum xeeb) tsis raug, qhov net capacitive reactance tuaj yeem qis dhau, kos duab tam sim no.

Yog vim li cas nws ua rau kub:Cov terminals thiab cov khoom siv sab hauv yog tsim los rau ib qho kev ntsuas tam sim no. Tshaj qhov ntsuas no ua rau overheating thoob plaws.

 

4. Tsis zoo los yog puas Terminals/Lugs

Yog vim li cas nws tshwm sim:Cov ntaub ntawv tsis zoo, corrosion, lossis kev puas tsuaj rau lub cev tuaj yeem ua rau muaj qhov tsis zoo ntawm lub davhlau ya nyob twg nws tus kheej.

Yog vim li cas nws ua rau kub:Tib lub hauv paus ntsiab lus xws li kev sib txuas xoob- siab dua hauv cheeb tsam ua rau muaj cua sov hauv cheeb tsam ntawm lub davhlau ya nyob twg.

 

5. Internal Capacitor Failure

Yog vim li cas nws tshwm sim:Lub capacitor tuaj yeem pib ua tsis tiav sab hauv vim yog dielectric tawg, poob ntawm electrolyte, lossis kev laus.

Yog vim li cas nws ua rau kub:Internal txhaum feem ntau tsim ibib nrab tso tawm (me me sab hauv arcs)los yog ua kom cov dielectric poob nyob rau hauv lub capacitor. Cov cua sov sab hauv no yuav tsum tau dissipate, ua rau tag nrho chav tsev, nrog rau nws cov terminals, ua kub dua li qub.