2.2: The parameters of a 200/3000V, 50HZ single phase transformer are given below: R=0.018 N, X,=0.04 N, R-4 n, X,-10 0, R,=150 N, X,-800 and ZL= 50-J75. If the primary voltage is 220V, find By Using the Exact Equivalent Circuit: (i) The voltage regulation, (ii) The load voltage, (iii) The copper and iron losses, (iv) The efficiency. ellicienev.
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- Consider Figure 3.25 of the text for a transformer with off-nominal turns ratio. (i) The per-unit equivalent circuit shown in part (c) contains an ideal transformer which cannot be accommodated by some computer programs. (a) True (b) False (ii) In the - circuit representation for real c in part (d), the admittance parameters Y11 and Y12 would be unequal. (a) True (b) False (iii) For complex c, can the admittance parameters be synthesized with a passive RLC circuit? (a) Yes (b) NoThe parameters of a 1000/250V, 50HZ single phase transformer are: R1=1.3 N, X1=2.8 N, R2=0.11 N, X2=0.2 N, R,=250 N, X,=900 N. If the load voltage is 220V, load power is 10kW, and load power factor is 0.8 lagging. Find by using the exact equivalent circuit: (i) Input current, (ii) The input voltage and power factor, (iii) The magnetizing current, (iv) The copper losses, (v) The voltage regulation.Primary side-reduced equivalent circuit parameters of a 25 KVA, 50 Hz, 4000/400 Volt transformer R1 = 32 Ω, X1 = 45 Ω, Rc = 250000 Ω, R2 '= 66.14 Ω, X2' = 79.34 Ω, Xm It is given as = 30000 Ω. Since the secondary of the transformer is fed at a full load rated voltage with an advanced power factor of 0.9, for these operating conditions; a) Calculate the primary voltage using the T equivalent circuit. (Only the amplitude of the voltage and the phase value will not be entered.) b) Calculate the efficiency of the transformer. c )Calculate the voltage regulation of the transformer.
- 1.The equivalent parameters of a 150kVA, 2400V/240V transformer, are R1=0.2Ω, R2=2mΩ, X1=0.45Ω, X2=4.5mΩ, Rc=10kΩ, and Xm=1.55kΩ. The transformer is operating at rated load and rated voltage with 0.8 lagging power factor. Using the approximate equivalent circuit referred to the primary side, determine: (i) (i) the voltage regulation (ii) (ii) the transformer power loss and efficiency 2.Nanoscale drives occur in the living world for example in the bacterial flagellum or ATP synthase. For one of these drives describe with the aid of diagrams how it operates and discuss the features which the drive has in common with large scale, man-made counterparts. 3.A 15 kW, 250V shunt motor with Ra=0.22 Ω, Rf=170 Ω. At no-load and rated voltage, the speed is 1200 rpm and the armature current is 3 A. At full-load and rated voltage, the line current is 55A. What is the full-load speed?A 2.4-kVA, 2400/240-V, 50-Hz, step-down transformer has the followingparameters: R, = 1.5 a, X, = 2.5 R, R, = 0.02 a, X, = 0.03 Q, R,, = 6 kR,and X,, = 8 kR. It is operating at 80% of its load at unity power factor.Using the exact equivalent circuit embodying the ideal transformer, determine the efficiency of the transformer. Also sketch its phasor diagram.A 20-kVA 8000/277-V distribution transformer has the following resistances and reactance: RP = 32 Ω RS = 0.05Ω X P = 45Ω XS = 0.06Ω RC = 250 kΩ X M = 30 kΩ The excitation branch impedances are given referred to the high-voltage side of the transformer. (a) Find the equivalent circuit of this transformer referred to the high-voltage side. (b) Find the per-unit equivalent circuit of this transformer. (c) Assume that this transformer is supplying rated load at 277 V and 0.8 PF lagging. What is this transformer’s input voltage? What is its voltage regulation? (d) What is the transformer’s efficiency under the conditions of part (c)?
- A 10MVA 138kV/13.8kV Y-Δ transformer supplies 8.8 MW of resistive load (Δ connected) at the LV side from a 138 kV power grid (infinite bus) at the HV side. Using an ideal transformer model, the line current drawn from the grid in Amperes is?630kVA 31500/400 DY 50Hz transformer has no load and short circuit tests power measurements are given as 1kW and 20kW respectively. Under the fourth of the nominal load with 0,85 capacitive power factor, calculate the efficiency of the transformer at nominal voltage as %?A Transformer with 10:1 ratio and rated at 50-kVA, 2400/240-V, 50-Hz is used to step down the voltage of a distribution system. The low-tension voltage is to be kept constant, if the transformer has: R = 2.2 0, R2 = 0.014 Q, X, = 4.1 0, X2 = 0.03 0, then, a. What load impedance connected to low-tension side will be loading the transformer fully. b. Calculate the equivalent resistance as referred to primary. c. Calculate the equivalent reactance as referred to primary. d. Calculate the equivalent impedance as referred to primary. e. Calculate the total Cu loss.
- Nominal tests 50 kVA, 20,000 / 480 V, 60 Equivalent of single phase transformer in Hz to determine circuit parameters Table of data for experiments presented. a. Obtain the T-equivalent circuit of the transformer reduced to secondary. b. Calculate the efficiency of the loaded transformer with 0.7-inductive power factor at the label current. c. The transformer is connected to the 50 Hz network and 0.7-inductive power factor at the tag current loaded with. Calculate the efficiency of the transformer.A transformer with a 10:1 ratio and rated at 60kVA, 2200/220V, 60Hz is used to step down the voltage of a distribution system. The low tension voltage is to kept constant at 220V. (a) What load Impedance connected to the low-tension side will be loading the transformer fully at 0.8 power factor (lag) ? (b) What is the value of this impedance referred to the high tension side?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