التوليد ومحطات التحويل الرئيسية
TRANSCRIPT
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:نن التيار القياسي لمفاتيح النقل األوتوماتيكية المتوفرة في السوق آاآلتي فلو فرضنا بأن مق
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A 800أي A 605نختار في هذه الحالة مفتاح قفل أوتوماتيكي ذو مقنن أآبر من
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אאאא
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אאאאאW 1250 , 1125 , 900 , 875 , 750 , 625 , 500 , 437.5 , 375 , 250
אאא1170 kVA أي نختار
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:اء فهم الموضوع سنفترض مجموعة أخرى من األحمال حتى ال يس
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אאא
אאאא
- ٧٢ -
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:نختار المولد بناء على هذا الحمل وبهذا يكون أنسب مولد هو . ٢١٨٫٦٣ولكن أقصى حمل متوقع هو 250 kVA
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أشكال شبه منحرف أربعة سيمها الىيمكن حساب المساحة تحت المنحنى بتق: مالحظة
2
אא٢אKאאאאW
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0 ٨ 12 ٢٠ 24
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20000kWאא61500000kWhKאW EאK
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אא אאא
p.m.126a.m. 200W
6a.m.12noon 3000W
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9p.m.12p.m. 1000W
Eא
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אאא
אאאא
- ١٤٨ -
אSymbols
A :אAmpere or areaC :אCapacitance
D :א{אDiameter,
Distance E :אאVoltage of
cell f :אFrequency
F :אFarad
G :אאConductance
H :א{א{Head, Henry
I :אCurrent
j :אא Vector operator
:אאPermittivity of air
r :אאRelative
permittivity L :אInductance
l :אLength
m :אMass
n :אSpeed P :אאActive power
p :אאNumber of
poles Q :אא{Reactive power
R :אResistance
r :אRadius
S :אאApparent power
T :אא{אTemperature,
Cycle V :אVoltage per phase
U :אLine to line Voltage
X :אReactance
Y :אAdmittance
Z :אImpedance
m :אאAngular Velocity
: أومOhm :אEfficiency
EmWאStep voltageW Wא א Soil
resistivityW Km Wא אא
The geometrical factor Ki WאThe correction
factor IG(p.u) Wאא
אאThe average current
in the grounding system Lm Wא א
The length of the conductor that makes up the grounding system
אאא
אאאא
- ١٤٩ -
אא אא א
1. “The Australian renewable Energy”, Mordoch University, June 1999.
Katrina O’Mara and Mark Rayer
“Alternative Energy Review”, September 2000Ontario Hydro
“ The Energy Alternative, Boxtree Ltd, London, 1990
Walter C. Patterson “The energy Sourcebook: A guide to
technology”, Resources and Policy, American Institute of Physics, 1991
Ruth Howes & Anthony Fainberg
“Harnessing Solar Power: The Photovoltaics Challenge, New York, Plernum Publishing,
1990Ken Zweibel
“Power system stability and control”, McGraw-Hill, New York,1994P. Kundur
Mitsubitshi Heavy Industries, (http:/www.mhi.co.jp/tmw/products/)
Takasago Machinery Works
“A textbook of ELECTRICAL TECHNOLOGY” S.CHAND 22 Ed 1997 B.L. Theraja, A.K. Theraja
: Product line Features (http:/www.siemens.com ) Siemens Power Generation
1. ," Electric Power Distribution System Engineering", Mc Graw-Hill 1986
Toran Gonen
?אא? Kא،Kא
א
http//www.abb.com/highvoltage
http//www.ev.siemens.de