Xaiv cov Reactance Rate rau Series Reactors hauv Capacitor Banks

Taw qhia

Series reactors (tseem hu uadetuned reactors) siv nrog lub hwj chim capacitor txhab nyiaj tau lug pov thawj nyob rau hauv lub hwj chim systems thoob ntiaj teb los txhim kho reactive zog them, txo kab poob, txwv capacitor hloov inrush tam sim no, thiab suppress harmonic distortion.

 

Kev xaiv ntawm qhov tsim nyog reactor reactance tus nqi yog qhov tseem ceeb vim hais tias cov kev sib haum xeeb tam sim no cuam tshuam los ntawm ntau yam, suav nrog cov kab sib chaws sib haum xeeb, qhov system impedance, thiab capacitor bank tsis. Qhov tsis zoo reactance tus nqi yuav ua rau resonance, capacitor overload, overheating, los yog cov khoom tsis ua hauj lwm ntxov.

 

Kab lus no piav qhia txog cov hauv paus ntsiab lus tom qab xaiv tus nqi reactance thiab muab cov lus qhia ua tau zoo rau kev siv nyiaj hauv tuam txhab nyiaj capacitor.

 

1. Limiting Capacitor Switching Inrush Tam sim no

Capacitor hloov inrush tam sim no yog ib qho ntawm feem ntau ua rau muaj kev ntxhov siab ntawm kev hloov khoom siv thiabcov tsev txhab nyiaj capacitor. Tshaj dhau tam sim no tuaj yeem ua rau cov contactors, circuit breakers, capacitors, thiab lwm yam khoom siv hluav taws xob.

 

Ob hom inrush tam sim no feem ntau tshwm sim thaum lub sij hawm capacitor bank energization:

Hom 1: Ib qho Capacitor Bank Hloov

Thaum lub txhab nyiaj standalone capacitor muaj zog, qhov tshwm sim tam sim no feem ntau nyob rau hauv qhov kev tso cai muaj peev xwm ntawm cov khoom siv hloov pauv. Feem ntau, tsis tas yuav tsum muaj kev ntsuas tam sim no ntxiv - txwv.

 

Hom 2: Rov qab - mus rau - Rov qab Capacitor Bank Hloov

Thaum lub txhab nyiaj capacitor ntxiv tau hloov pauv thaum ib lossis ntau lub tsev txhab nyiaj capacitor twb tau txuas nrog lub kaw lus, qhov muaj zog ntau dua tuaj yeem tshwm sim.

 

Kev paub dhau los qhia tau hais tias qhov tam sim no tam sim no tuaj yeem ncav cuag20 mus rau 250 npaug ntawm qhov ntsuas tam sim nontawm lub txhab nyiaj capacitor.

Lub inrush tam sim no tuaj yeem qhia tau tias:

 

Qhov twg:

(Q_C)=Capacitor reactive zog

(X_L)=Circuit Court inductive reactance

 

Qhov sib npaug qhia tau hais tias nce qhov inductive reactance ntawm Circuit Court txo cov inrush tam sim no. Yog li ntawd, kev txhim kho lub reactor uas tau xaiv kom raug zoo txwv kev hloov pauv thiab tiv thaiv ob qho tib si capacitors thiab cov khoom siv hloov pauv.

 

2. Harmonic Suppression thiab Reactance Rate Xaiv

Cov tshuab hluav taws xob niaj hnub no muaj ntau cov khoom siv tsis yog linear, xws li:

• Variable Frequency Drives (VFDs)
• Rectifiers
• UPS systems
• Arc rauv
• Renewable zog converters

 

Cov khoom siv no tsim cov kev sib raug zoo tam sim no uas cuam tshuam qhov voltage waveform thiab cuam tshuam tsis zoo rau cov tsev txhab nyiaj capacitor.

 

Txhawm rau txhim kho lub zog zoo thiab tiv thaiv cov capacitors, series reactors feem ntau tau teeb tsa ua kev sib haum xeeb tiv thaiv reactors.

 

Kev cuam tshuam ntawm Harmonics ntawm Capacitor Banks

Ib qho uas tsis yog -sinusoidal waveform muaj ib qho tseem ceeb zaus feem ntau ntxiv rau cov zaus sib haum xeeb uas yog qhov sib npaug ntawm qhov ntau zaus.

 

Hauv cov tshuab fais fab, qhov tseem ceeb tshaj plaws kev sib haum xeeb yog:

• 3rd harmonic
• 5th harmonic
• 7th harmonic
• 11th harmonic
• 13th harmonic

 

Ntawm cov no, cov5th harmonicfeem ntau yog cov khoom tseem ceeb.

 

Xav txog ib qho system uas tsuas muaj qhov tseem ceeb ntawm qhov voltage thiab 5th harmonic voltage tivthaiv. Yog hais tias 5th harmonic voltage nce mus txog 26.45% ntawm qhov ntsuas voltage:

• Capacitor overvoltage mus txog kwv yees li 3.4%
• Capacitor overcurrent mus txog kwv yees li 65.6%
• Reactive fais fab overload mus txog kwv yees li 35%

 

Cov txiaj ntsig no qhia meej meej txog qhov cuam tshuam loj ntawm kev sib haum xeeb ntawm kev ua haujlwm hauv tuam txhab nyiaj capacitor.

 

3. Kev Tshawb Fawb Txog Kev Tshawb Fawb

Lub harmonic tam sim no yuav xam raws li:

Qhov twg:

• (E_n)=Harmonic voltage
• (X_B)=System impedance
• (X_L)=Reactor reactance
• (X_C)=Capacitor reactance
• (n)=Harmonic xaj

 

Resonance tshwm sim thaum:

 

Cov xwm txheej zoo sib xws:

Txhawm rau kom tsis txhob muaj kev cuam tshuam thiab cuam tshuam cov kev sib raug zoo tam sim no, cov xwm txheej hauv qab no yuav tsum txaus siab:

 

Qhov no ua kom ntseeg tau tias cov ceg capacitor nthuav tawm cov yam ntxwv inductive ntawm lub hom phiaj harmonic zaus, yog li tiv thaiv kev sib haum xeeb.

 

4. Kev txiav txim siab tus nqi Reactor Reactance Rate

Hauv kev xyaum ua engineering, qhov kev nyab xeeb ntawm 1.5 feem ntau siv:

 

Rau 5th harmonic suppression:

Tus nqi reactance (K) yog txhais raws li:

qhov twg:

(K)=Reactor reactance tus nqi

(X_L)=Fundamental-frequency reactor reactance

(X_C)=Fundamental-frequency capacitor reactance

 

Yog li ntawd, a6% reactance tus nqiua tau zoo detunes lub txhab nyiaj capacitor hauv qab 5th harmonic zaus, suppresses 5th -kev txiav txim thiab siab dua harmonics, thiab txwv hloov inrush tam sim no mus rau kwv yees li tsib npaug ntawm qhov ntsuas tam sim no.

 

5. Daim Ntawv Qhia Kev Xaiv Tus Txheej Txheem Reactance Rate

0.1% - 1% Reactance Rate

Daim ntawv thov:

• Inrush tam sim no txwv xwb
• Tsis xav kom muaj kev sib haum xeeb

 

Kev siv yam:

• Cov tshuab hluav taws xob huv huv nrog cov ntsiab lus qis heev
• Luv - Circuit Court tam sim no txwv

 

4.5% - 6% Reactance Rate

Daim ntawv thov:

• Kev tsuj ntawm 5th - kev txiav txim thiab siab dua harmonics

 

Kev siv yam:

• Kev lag luam chaw
• Cov tsev lag luam
• General reactive fais fab nyiaj them systems

 

Feem ntau xaiv tus nqi reactance

12% - 13% Reactance Rate

Daim ntawv thov:

• Kev tsuj ntawm 3rd - kev txiav txim thiab siab dua harmonics

 

Kev siv yam:

• Cov kab ke nrog cov ntsiab lus tseem ceeb thib 3 harmonic
• Tshwj xeeb harmonic mitigation tej yaam num

 

Siv tau System zaus

• 50 Hz fais fab system
• 60 Hz fais fab system

 

Xaus

Series reactors yog ib qho tseem ceeb ntawm cov tsev txhab nyiaj niaj hnub capacitor, muab kev tiv thaiv zoo tiv thaiv kev hloov pauv tam sim no, kev sib haum xeeb distortion, thiab teeb meem resonance thaum txhim kho tag nrho cov hluav taws xob zoo thiab lub zog efficiency.

 

Tus nqi reactance yuav tsum ib txwm raug xaiv raws li qhov tseeb ntawm qhov chaw thiab kev ntsuas kev sib haum xeeb:

• 6% reactance tus nqiyog feem ntau pom zoo rau kev sib raug zoo tsuj roj thiab capacitor bank tiv thaiv.
• 0.2%–1% cua-cov tub ntxhais reactorsyog qhov tsim nyog thaum lub hom phiaj tseem ceeb yog txwv kev hloov pauv tam sim no thiab, kom tsawg dua, txo qhov luv luv -circuit tam sim no.
• 12% -13% reactance tus nqiraug pom zoo rau cov ntawv thov uas xav tau kev tawm tsam ntawm qhov tseem ceeb thib 3 - xaj kev sib haum xeeb.

 

Kev xaiv cov reactor kom ntseeg tau tias kev ua haujlwm ruaj khov, kev pab cuam lub neej ntev dua, txhim kho lub zog kho qhov ua tau zoo, thiab txhim kho lub zog zoo thoob plaws hauv lub tshuab hluav taws xob.