A transformer can be described as a device that transfers energy from one circuit to another circuit via mutual ondiction.
Mutual inductance
Unit-henery
Symbole-m
Mutual inductance can be described as the ability bto produce a voltage in one circuit by varing a current in a another. As the current varies, the magnatic field surrounding the coil also varies. The varieng field intensity is passed to the second coil.
Coefficent of couppling
Symbole-k
The coefficent of coupiling describes how much of the total flux links the tow circuits.the best possible coefficent is k=1. If all the lines of the flux link both circuts, then k=1.
The mutal inductance of a transformer can be caluculated using the following formula
M=k root L1*L2
Where m=mutal inductance (henerys)
K= coefficent of coupiling
L1 = self inductance of the primery
L2 = self inductance of the secondery
Turns ratio
Turns ratio =Np/Ns
Voltage ratio
Voltafe ratio = Vp/Vs =Np/Ns
Current ratio
Power can not be created by a transformer. If the voltage increases , the current must decreases proportionally. The power must always be the same on both sides of the transformer.
Current ratio= Is/Ip =Np/Ns =Vp/Vs
Impudance ratio
Impudance ratio =(Ns/Np)2 =Zs/Zp
Where Zs = load impudance
Zp =impudance of primary as seen by source
Ns/Np = secondary to primary turns ratio
Transformer efficency
The persent efficency of the transformer can be caluculated by dividing the true power out , by the power in and then multiplaying by 100.
Efficency% = p out/ p in *100
A transformer can be described as a device that transfers energy from one circuit to another via mutal indiction.
Turns ratio = Np/Ns =Vp/Vs =Is/Ip
Impudance ratio =(Ns/Np)2 = Zs/Zp
0 Comments