electrical machines lsegg216a 9080v. transformer operation week 4
TRANSCRIPT
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Electrical Machines
LSEGG216A9080V
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Transformer Transformer OperationOperation
Week 4 Week 4
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Transformer Transformer OperationOperation
V+ CIVILCIVIL
Voltage Current
Magnetic Flux
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Transformer Transformer OperationOperation
Applied Voltage
Induced Voltage
Induced Voltage in Secondary
Resultant Current
V1
V’1V’2
IM
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Induced VoltageInduced Voltage
• Φmax =Maximum instantaneous flux• F = Frequency• N = Number of turns• Bmax = Maximum permissible flux density in Wb• A = CSA of core in m2
fN44.4V max AfNB44.4V max
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Transformer Transformer OperationOperation
V1
IM
Ie
Io
Ie= Iron loss currentIo = No load current
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Transformer Transformer OperationOperation
V1
V’1V’2
Io
I’2
I’1
I1
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Transformer Transformer OperationOperation
V1
V’1V’2
Io
I’2 I’1
I1
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Transformation Transformation RatioRatio
Magnetic flux is common coils
fN44.4V max
Therefore the voltage can be varied by changing the number of turns
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Transformation Transformation RatioRatio
V1= N1
N2V2== k = Transformation Ratio
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Transformation Transformation RatioRatio
V1x I1
N1
N2
= V2 x I2
=I1
I2
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Transformation Transformation RatioRatio
V1x I1
VA
V2 x I2
kVAPower In Power Out
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Transformation Transformation RatioRatio
V1x I1V2 x I2
200
200V 100V
400
K = 2
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Voltage Voltage RegulationRegulation
EI
Voltage Drop Due to R
Voltage Drop Due to XL
V
• Resistance• Inductance
Coils have both
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Voltage Voltage RegulationRegulation
EI V
Lagging PF of 45
V less than E
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Voltage Voltage RegulationRegulation
EI
V
Leading PF of 45
V More than than E
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Voltage Voltage RegulationRegulation
100 x VNo Load – V Full Load
VFull Load
R% =
If PF = Unity
100 x I x (R x cos + XL x sin)
VFull Load
R% =
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Transformer Basic Transformer Basic TestsTests• Open Circuit Test• Short Circuit Test• Oil Tests• Electrical Insulation• Polarity• Continuity
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Open Circuit TestOpen Circuit TestUsed to determine Iron Losses
Supply = Rated Voltage
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Open Circuit TestOpen Circuit Test
Wattmeter reading
V1
IMIo
Ie
Supply Voltage
Ammeter reading
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Short Circuit TestShort Circuit TestUsed to determine Copper Losses
Supply Adjusted = Rated Secondary Current