Comparison (similarity/difference) between Two Winding Transformer and Autotransformer
|
Sr. No.
|
Point of comparison
|
Two winding Transformer
|
Auto Transformer
|
|
1
|
Two types
|
Step down and step up
|
Similar types
|
|
2
|
Cost
|
More
|
Less
|
|
3
|
Construction
|
Core and two winding
|
Core and only one winding
|
|
4
|
Weight of copper
|
Wc
|
(1 – k) Wc which is
< wc |
|
5
|
Voltage
|
Fixed values
|
Variable on secondary
|
|
6
|
Electrical Isolation
|
Two windings are electrically isolated
|
Two winding are integral (Not isolated).
|
|
7
|
Size
|
Large
|
Compact
|
|
8
|
Efficiency
|
Lesser
|
More
|
|
9
|
Voltage regulation
|
More (poor)
|
Lesser (Better)
|
|
10
|
Applications
|
1.Power
transformer
2.Distribution
transformer
3.Isolation
transformer
4. Instrument
transformer
5. Welding
transformer |
1. Starting
of motor used as autotransformer starter
2. Varias
for charging voltage in drama stages in drama stage
3. Dimmerstat
|