B Flashcards
A transformer transfers electrical energy from one curcuit to another by mutual induction. This is also called
Transformer action
Two key components that caus Volt drop in the secondary and primary windings of a loaded transformer are
Inductive reactance (Xlp and Xls)
Resistance (Rp and Rs)
Small amount of current flowing in the primary winding is called
Exciting current
The core losses of a transformer can be determined with an
Open circuit test
Copper losses of a transformer can be determined by
A short circuit test
What are the two core losses
Eddie current and hysteresis
What factors effect transformer efficiency
Load capacity
Power factor
Losses
Impedence voltage of a transformer can be determined by
Short circuit test
Primary voltage value is called
Impedence voltage
And is much less than the rated voltage
The percent impedence voltage is generally what percentage
Between 2% and 10%
Paralleling single phase transformer
A way to increase the capacity of an existing system
What happens to impedance when transformers are connected in parallel
Impedance drops
Exciting current
A small amount of current that flows in the primary winding
Exciting current produces
A magnetic flux (exciting flux) in the transformer core
Secondary induced voltage is equal too?
Is equal to the secondary output voltage
