Obtain the equivalent circuit of a 200/400-V, 50-Hz, 1-phase transformer from the following test data :
O.C. test: 200 V, 0.7 A, 70 W - on L.V. sideS.C. test: 15 V, 10A, 85W - on H.V. side Calculate the secondary voltage when delivering 5 kW at 0.8 p.f. lagging, the primary voltage being 200 V.

Question

Obtain the equivalent circuit of a 200/400-V, 50-Hz, 1-phase transformer from the following test data : <ul style="list-style-type:disc;">O.C. test: 200 V, 0.7 A, 70 W - on L.V. sideS.C. test: 15 V, 10A, 85W - on H.V. side Calculate the secondary voltage when delivering 5 kW at 0.8 p.f. lagging, the primary voltage being 200 V.

Satt Academy · Accepted Answer

Given,200/400V, 1

ϕ, 50HzOC (LV) : 200V, 0.7A, 70WSC (HV) : 15V, 10A, 85WLoad : 5kW, 0.8pf (lag), V1 = 200VTurns ratio a = 2 pf = 70200 × 0.7= 0.5 , Iω = 0.35A , Iμ = 0.606A Rc=2000.35=571.4 Ω , Xm=2000.606=330 Ω Zsc= 1.5 Ω, Req, H =85100=0.05 Ω, Xeq, H = 1.229 Ω. Req, L = 0.2125 Ω, Χeq, L = 0.3072. S = 50000.8= 6250 VA , I2≈ 6250400=15.625 A, I2'=7.8125A Zeq, L =0.2125+j0.307 , I2'=7.8125 ∠-36.9°. Vdrop =2.89 ∠ 18.2°V E1=200∠0°-2.75-j0.905≈197.3V. E2=2×197.3=394.6VSeries drop (HV): I2 × Zeq, H ≈ 23.4V ∠18.2° V2 =394.6-(22.3+j7.35)= 372.4V .

Obtain the equivalent circuit of a 200/400-V, 50-Hz, 1-phase transformer from the following test data :
O.C. test: 200 V, 0.7 A, 70 W - on L.V. side
S.C. test: 15 V, 10A, 85W - on H.V. side Calculate the secondary voltage when delivering 5 kW at 0.8 p.f. lagging, the primary voltage being 200 V.

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Satt AI

Hi, আমি SATT AI!

Obtain the equivalent circuit of a 200/400-V, 50-Hz, 1-phase transformer from the following test data : O.C. test: 200 V, 0.7 A, 70 W - on L.V. sideS.C. test: 15 V, 10A, 85W - on H.V. side Calculate the secondary voltage when delivering 5 kW at 0.8 p.f. lagging, the primary voltage being 200 V.

ইলেকট্রিক্যাল এন্ড ইলেকট্রনিক্স ইঞ্জিনিয়ারিং

Related Question

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3 . State maximum power transfer theorem.

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4 . If the switch in the following circuit opens at t = 0, find v(t) for t≥ 0 and the initial energy stored in the capacitor.

5 . Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (fc) if L = 2 mH and R = 10 kΩ.

6 . Compute the average and effective values of the square voltage wave shown in the following figure.

Related Question

Promotion

Satt AI

Hi, আমি SATT AI!

Obtain the equivalent circuit of a 200/400-V, 50-Hz, 1-phase transformer from the following test data :
O.C. test: 200 V, 0.7 A, 70 W - on L.V. side
S.C. test: 15 V, 10A, 85W - on H.V. side Calculate the secondary voltage when delivering 5 kW at 0.8 p.f. lagging, the primary voltage being 200 V.

1 .
Find currents I and I₁ in the following circuit.

2 .
Determine the Thevenin's equivalent circuit at terminal X-Y of the following circuit.

4 .
If the switch in the following circuit opens at t = 0, find v(t) for t≥ 0 and the initial energy stored in the capacitor.

5 .
Show that a series RL circuit is a low pass filter if the output is taken across the resistor. Calculate the cut-off frequency (f_c) if L = 2 mH and R = 10 kΩ.

6 .
Compute the average and effective values of the square voltage wave shown in the following figure.