Electrical Machines LSEGG216A 9080V.

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Presentation transcript:

Electrical Machines LSEGG216A 9080V

Transformer Operation Week 2

Introduction Basic operation AS/NZS symbols Types Step-up, Step-down, Isolation

Transformer Operation CIVIL V+ Voltage Current Magnetic Flux

Transformer Operation Induced Voltage V’2 V’1 V1 Induced Voltage in Secondary Applied Voltage IM Resultant Current

Induced Voltage Φmax =Maximum instantaneous flux F = Frequency N = Number of turns Bmax = Maximum permissible flux density in Wb A = CSA of core in m2

Transformer Operation Ie V1 Ie= Iron loss current Io = No load current Io IM

Transformer Operation V’2 V’1 V1 I’1 Io I1

Transformer Operation V’2 V’1 V1 I’2 I’1 Io I1

Therefore the voltage can be varied by changing the number of turns Transformation Ratio Magnetic flux is common coils Therefore the voltage can be varied by changing the number of turns

Transformation Ratio V1= N1 = k = Transformation Ratio V2= N2

Transformation Ratio V1x I1 = V2 x I2 N1 I2 = N2 I1

Transformation Ratio kVA VA Power In Power Out V2 x I2 V1x I1

Transformation Ratio K = 2 200V 100V V2 x I2 V1x I1 800 200

Transformer Basic Tests Open Circuit Test Short Circuit Test Oil Tests Electrical Insulation Polarity Continuity

Open Circuit Test Used to determine Iron Losses Supply = Rated Voltage

Open Circuit Test Ie V1 Wattmeter reading Supply Voltage Ammeter reading Io IM

Supply Adjusted = Rated Secondary Current Short Circuit Test Used to determine Copper Losses Supply Adjusted = Rated Secondary Current