Fundamental of Electrical Loads Chapter 7 7/3/2015Prof. Magdi El-Saadawi1.
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Transcript of Fundamental of Electrical Loads Chapter 7 7/3/2015Prof. Magdi El-Saadawi1.
![Page 1: Fundamental of Electrical Loads Chapter 7 7/3/2015Prof. Magdi El-Saadawi1.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649d745503460f94a54e5e/html5/thumbnails/1.jpg)
Fundamental of Electrical Loads
Chapter 7
04/19/23 Prof. Magdi El-Saadawi 1
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The Load Curve • It gives the following information
– Variation of load during different hours of day– Max. and Min. value s of daily load– Average annual load of the station– Information whether the installations is
working efficiently or not
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حكومى لحمل توضيحى شكل
الحمل يمثل الرأسى المحوروات بالكيلو
الزمن يمثل األفقى المحوربالساعات
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Difference between load curves of summer and winter
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Load Duration Curve
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Load Duration Curve
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Load Curve and Load Duration Curve
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• Average Demand: the ratio of kWh delivered by the station in a particular period divided by the hours in that period
• Load FactorMonthly L.F. =
kWh supplied in a month
Maximum demand * 24 * 30Annual L.F. =
kWh supplied in a year
Maximum demand * 8760
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• Diversity of Load
فترة فى تعمل ال المختلفة األحمال أن يعنىتتبع الكهرباء شركات أن أو واحدة زمنية
ذلك إلى تدفع سياسات
• Diversity Factor
the ratio of the sum of maximum demands of the individual category to the maximum demand of the power station
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Practical Example on Diversity Factor
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Solution 1:
Transformer Size (Assuming Diversity Factor of 1.0)
2,000 + 1,500 + 1,000 = 4,500 kVA
Solution 2:
Transformer Size (Assume Diversity Factor of 1.2) Choose 3,750 kVA
(4,500 kVA divided by 1.2 = 3,750 kVA)
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?Which is better and why
High or Low load factor value
High or Low diversity factor value
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• Plant Factor
Indicates how best the plant capacity has been utilized
Station output in kWh
kW1*h1 + kW2*h2 + kW3*h3 + …….
• Capacity Factor is a value used to express the average percentage of full
capacity used over a given period of time. Average demand on the Station
Maximum Installed Capacity of the Station
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• Connected Load Factor
Average kWh
Connected load * 8760
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Load Duration Curve
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