Q5/ A 6.6 kV/350 kV, 350 kVA, 50 Hz testing transformer when tested had the following observations: (a) No load voltage rise on HV side was 1% more than the rated value when 6.6 kV was applied on primary side. (b) The rated short circuit current was obtained on HV side when shorted with 8% rated voltage on primary side. Calculate (i) self-capacitance of transformer along with its HV side bushing, and (ii) leakage reactance neglecting resistance

Q5/ A 6.6 kV/350 kV, 350 kVA, 50 Hz testing transformer when tested had the following observations: (a) No load voltage rise on HV side was 1% more than the rated value when 6.6 kV was applied on primary side. (b) The rated short circuit current was obtained on HV side when shorted with 8% rated voltage on primary side. Calculate (i) self-capacitance of transformer along with its HV side bushing, and (ii) leakage reactance neglecting resistance

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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2.A 10 kVA, 1000 V / 200 V, 50 Hz, single phase transformer has HV and LV sidewinding resistances as 1.1 Ωand 0.05 Ω respectively. The leakage reactances of HV and LV sides are respectively 5.2 Ω and 0.15 Ωrespectively. Calculate [i] the voltage to be applied to the HV side in order to circulate rated current with LVside shorted, [ii] Also calculate the power factor under this condition.
Mr. Musa Al Biruni is analyzing a 100 kVA, 60 Hz, 7200-480V, single phase transformer, which hasthe following parameters expressed in ohms: RHS=3.06, XHS=6.05, XM,HS=17809, RLS=0.014,XLS=0.027, Rfe,HS=71400The transformer is supplying a distribution side load that draws a rated current at 480V and 75percent power-factor lagging. Sketch the appropriate equivalent circuit and determine (a) theequivalent resistance and equivalent reactance referred to high side (b) the input voltage to thetransformer
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Solve the following problems with complete solutions and unitsusing two(2) decimal digits. Use your own analysis andcomputations. 2. A 3-phase transformer, ratio 33/6.6-kV, Δ-Y, 2-MVA has a primary resistance of 8 Ω per phase and a secondary resistance of 0.08 Ω per phase. The percentage impedance is 7%. Calculate the secondary voltage with rated primary voltage and hence the regulation for full-load 0.75 power factor lagging conditions.
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Scanned A 100KVA, 6600/330V, 50Hz, single-phase transformer took 10A and 436W at 100V in a short-circuit test, these values are taken in the high voltage side. Calculate the voltage to be applied to the high voltage side on full-load at 0.8 P.F lagging when the secondary load voltage is 330V.
A 6.9 kV/600 V, multi-tap, single-phase distribution transformer is connected to the far end of a distribution line for which the rear end voltage is maintained at 6.9 kV. The equivalent impedance of the transformer referred to low voltage side is 0.05 + j0.25 Ω per phase. The impedance of each line is 1 + j2 Ω. It is required to maintain a terminal voltage of 600 V when the line current of 300 A at 80% pf lagging is delivered to the load. What approximate percentage tapping is required in the primary side? Neglect the changes in impedance due to changes in turns ratio. A. 94 % B. 92 % C. 90 % D. 88 %
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A radial transmission line system can be represented by a generating source connected to a three-phase transformer – (11kV/132kV, 50MVA, 10 % reactance) to which an overhead transmission line (j100 Ω) is connected. Connected to the other end of the transmission line is another three-phase transformer (132kV/33kV,50MVA, 12% reactance). This three-phase transformer located at a 33kV substation supplies a load of 30MW at a power factor of 0.8 lagging. The voltage level of the substation is to be maintained at 30kV. Use a base of 100MVA and 33kV . Use the above information to answer Q12 – Q16 12. Calculate the per unit value of reactance of the sending end transformer. a) 0.20 b) 0.25 c) 0.30 d) 0.343 e) none 13. Calculate the per unit value of reactance of the receiving end transformer. a) 0.32 b) 0.24 c) 0.41…