1 Methodology 1.1 Listin g of power demandsclswitchgears.com/pdf/Electrical Installations.pdf ·...

City Light P: 067663

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L.L.C. P.O.b63776

ations d locations aeing residents st be followhese rules mation: disturbs, and even dal Design Softe design pans. es are include‐line diagrart‐circuit curage drops ble sizes f switchgearprotective des for cascadinprotection oint‐out of th

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ry regulationtions are gofollows:

ons (decrees,regulations national stannational stan

ectrical instauthorities orconstraints b

on relevant Ical and enginernational les of most elvoltages ransformersransformers

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L.L.C. P.O.b63776

trical installad voltage disttrical installaon rules trical installasystems trical installan, switching trical installag arrangeme

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L.L.C. P.O.b63776

ctrical instalighting instactrical instal‐voltage lighctrical instalr transportabctrical instalry electrical ment parks aage alternatitage switchgies tage switchgems (buswatage switchgear and contve access fotage switchgruction sitessafety princductors by ctage switchg to be instal

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L.L.C. P.O.b63776

cluding 1000equirementstage switchgtage switchgtage switchg

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0 V ‐ Generas ‐ Guide for gear and congear and congear and con

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tchgear and

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L.L.C. P.O.b63776

an installationnect an inisual inspects are made amay differ slighowever, areesign and rean this guide l the safety mtial, commeronal regulatar product (pyond the scooning electricpically, all ofall cable andn phases andnductivity tes

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L.L.C. P.O.b63776

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L.L.C. P.O.b63776

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3 Installe3.1 InducCurrent dThe full‐l• 3‐phase• 1‐phasewhere � Ia: cur� Pn: no� U: volt� for sin� or pha� η: per‐� cos : Subtrans• Subtrantimes the• Merlin designedpeak valu• If unexmeans thswitchgedevices cswitchgeMotor stAlthoughcurrents static sof(ExampleCompensIt is genesupplied power oumotors isAs discussignificanmeans a Compensperiods aAs noted


ed power loaction motordemand load currente motor: Ia =e motor: Ia =

rent demanminal powetage betweegle‐phase mase‐to‐phase‐unit efficienpower factosient currentnsient curree rms rated vGerin circuid to withstanue can be uppected tripphe starting cear withstandcan be destroear must be ctarting curreh high efficieare roughly ft start unit oe : 4 Ia insteasation of reaerally advantto inductionutput of the s generally rssed in chaptntly reducedcorrespondsation of reaat reduced pd above cos

L.L.C. P.O.b63776

ads – Characs

t Ia supplied= Pn x 1,000= Pn x 1,000

d (in amps) r (in kW) en phases fomotors (in voe. ncy, i.e. outpor, i.e. kW int and protecnt peak valuvalue Inm. St‐breakers, Tnd motor stap to 19 timesping of the ourrent exceeds can be reoyed. In ordconsidered. ent ency motors the same asor variable sad of 7.5 Ia).active‐powetageous for tn motors. Thmotors. Theeferred to ater L, the apd by the use ing reductioactive‐powepower. = kW inpu

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cteristics

d to the mot / (√3 x U x η / (U x η x co

r 3‐phase mlts). A single

put kW / inpnput / kVA inction settingue can be veSometimes tTelemecaniqarts with vers the rms ratvercurrent peds the normached, life ter to avoid s

can be founs some of staspeed drive a. r (kvar) supptechnical anhis can be ace applications “power‐fapparent powof shunt‐conon of input cur is particula

t/kVA input

m Al Quwain

tor is given bη x cos ) os )

otors and voe‐phase mot

ut kW nput g ry high ; typhis value canque contactory high subtrted value Inprotection omal limits. Asime can be rsuch a situat

nd on the maandard motoallows to red

plied to indud financial rchieved by un of this princtor improver (kVA) supnnected capurrent (sincearly advised

, UAE

by the follow

oltage betweor may be c

ical value is n reach 25 tors and therransient currm). occurs durings a result, soreduced andtion, oversiz

arket, in praors. The useduce the val

uction motoreasons to resing capacitnciple to the ement” or “pplied to an pacitors. Rede the voltagefor motors t

wing formul

een the termonnected ph

about 12 toimes Inm. rmal relays arent (subtran

g starting, thome maximud even somezing of the

ctice their ste of start‐delue of the sta

rs educe the cuors without operation o

“power‐factoinduction mduction of inpe remains cothat operate

ae:

minals hasetoneutr

o 15

are nsient

his um e

tarting ta starter, arting curren

urrent affecting thof inductionor correctionmotor can beput kVA onstant). e for long

ral

nt

e

n”.


so that a The curreI = Ia cos where coafter com


kVA input rent supplied/ cos ’

os is the pompensation,

L.L.C. P.O.b63776

eduction in d to the moto

ower factor Ia being the

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kVA input wor, after pow

before come original cur

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will increase wer‐factor co

pensation arrent.

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(i.e. improveorrection, is

nd cos ’ is

e) the value given by:

the power f

of cos

factor



L.L.C. P.O.b63776

box 7450 ,Umm Al Quwain

, UAE

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