Electrical Engineering - Transformers - Discussion

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Transformer works on the principle of Faradays Laws of Electro Magnetic Induction; with mutual Induction concept.

By Ohms Law ;current I = V/Z.
V =supply voltage- bak EMF.

Impedence Z =R+jX.
Reactance X =2 Pi f L.

We know that incase of DC supply,frequency f is zero;no induced EMF because there is no change of flux with DC(Induced EMF e= N dq/dt;).

Current I =(supply voltage-back EMF)/R=j+ X.

Here, numerator increases(back EMF is Zero) and denominator decreases(as X=0 and R is very less);consequently I increases to a dangerous level leading to burning of winding's if it is not properly fused.

Hence DC supply should not be connected to Transformer ; in-case connected a mechanism should be made to switch ON and OFF frequently(like SCR).

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Source belongs to primary winding where as load belongs to secondary winding. So in order to match or transfer impedance from primary side to secondary, k^2 (turns ratio) should be multiplied with primary impedance, then it will be equated with secondary impedance (matching is to obtain maximum power transfer). This is as illustrated.

80*k^2 = 320.
k^2 = 4.
k = 2.

In case transfer from secondary to primary, secondary impedance must be multiplied with 1/k^2. Equate it to primary impedance for matching. Same result will be obtained.

In the midst of each of the six material may related in power application however every material has particular character blowing conditions. The veritable material of MPP has used for most pointless fixation disappointment, which discharges up raising with mollypermalloy powder focuses and this may fitting for flyback transformer, buckboost transformer. The doled out air opening of MPP focuses is cover stray pulling in field and cleans kept switch hitter up included with gapped ferrite focuses.

The National Instructional Media Institute (NIMI) for Industrial Traning book.

Np/Ns=Zp/Zs.
Where,
Np=No of turns in the primary.
Ns=No of turns in the secondary.
Zp=primary impedance or (source).
Zs=secondary impedance or (load).
Sol; Source Z=80 ohm.
Load Z =320ohm.
Zp/Zs=80/320.
Turns Ratio =1:2 answer= 2.
1:2 Turns ratio match the 80 ohm source impedance to a 320 ohm load.

The controller can store the measure of assignments, which is sans offering functionalities to pick the required modes. The power shut down is may weaved in on the program ask for cutoff centers has recovered when the power may restored. Past what many would consider possible has specific for makers. Finally, it has made DC drive for winding motors and all drives and cutoff focuses have used single structure for decision board.

Above all guys discussed ok but there is a mistake in that !

Turns ratio(n) = N1/N2 =V1/V2 = I2/I1.
Same Transformer ratio is (K) = 1/n.

Means V2/V1 = N2/N1 = I1/I2 = K.

The question is Turns Ratio ?
V1*I1=V2*I2.
(v1)^2/R1= (V2)^2/R2.
So (V1/V2)^2=R1/R2.

Turns ratio n = (N1/N2)^2=R1/R2=80/320=1/4.

When we make sqrt it will come = 1/2.

What you guys are saying the above solution ?

Source side will be taken as primary then r1=80 and we have to match to secondary(loadside) given that it is 320 ie r1'=320.

Actually we know that whenever primary referred to secondary,
r1'=ksquare*r1.

So here,

ksquare*r1 = 320 that implies that,

ksquare = 320/r1=320/80=4.

i.e., ksquare = 4 then k=2.

Here k = tranaformation ratio.

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