Circutor computer SMART III-Fast Series Manuale Utente Scaricare il pdf (Pagina 23)

4�1�-DEFINITIONS

Thissectionprovidesanumberofdenitionsthatmaybeusefulforunderstandingtheopera-

tionoftheunit�

4�1�1 Four-quadrant regulator�

Thismeansthattheregulatoriscapableofperformingthemeasurementandregulationfunc-

tionswhentheactivepoweristransferredfromthemainstotheloads(commoncaseinacon-

sumerinstallation)orwhentheloadistransferredtothemains(inthecaseofinstallationswith

generatorsthatnotonlyallowtheconsumptionofenergy,butcanalsoexportandsellenergy)�

4�1�2 Stages and steps

A distinction mustbeestablishedbetweenstagesandsteps�Inthismanual,aStage is de-

scribed aseach group of capacitor banks into which the power factor compensation unit is

divided,whichmayhavedifferentpowerratings,usuallyinratiosof1:1,1:2,1:2:4,etc�

Astepiseachoneofthetotalpowerfractions(poweroftherststep)thatcanberegulatedby

usingstageswithdifferentweights�

4�1�3 FCP system (FAST Computerized Program)�

Thissystemcontrolstheconnectionsequenceofthevariousstages,tendingtominimisethe

numberofoperationsandtomatchtheusagetimesofthevariousstagesinordertoachieve

apre-determinedrequirednalpower�Theoperationsarecarriedoutsuchthat,inthecase

ofstageswithidenticalpower,thestagethathasbeendisconnectedthelongestisconnected

when there is demand and the stage that has been connected thelongest is disconnected

whenthereisasurplus�

4�1�4 Regulation program�

Thepowerratingsofthevariousgroupsorstagesusuallyfollowcertainpatternscalled"pro-

grams”�

Theprogramindicatesthepowerratiosbetweenthevariousstages�Themostfrequentpro-

gramsare:

Program 1�1�1�1 �Allstageshavethesamepower�For example: a 100 kvar unit with 5 steps

would be made up of 5 identical 20 kvar stages, and would be described as a (5 x 20) kvar unit.

Program 1�2�2�2�Everystageaftertherststagehastwiceasmuchpowerastherststage�

For example: a 180 kvar unit with 5 stages would be made up of a rst 20 kvar stage and 4

identical 40 kvar stages, and would be described as a (20 + 4 x 40) kvar unit.

Program 1�2�4�4�Thesecondstagehastwiceasmuchpowerastherststageandthere-

mainingstagesafterthesecondstagehavefourtimesasmuchpowerastherststage�For

example: a 300 kvar unit with 5 stages would be made up of a rst 20 kvar stage, a second 40

kvar stage and 3 identical 80 kvar stages. It would be described as a (20 + 40 + 3 x 80) kvar

unit.

Instruction Manual

Computer SMART III FAST

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 107 108

Nessun commento

Circutor computer SMART III-Fast Series Manuale Utente Pagina 23