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- A single-phase 100-kVA,2400/240-volt,60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 60 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: (a) primary voltage, (b) load impedance, (c) load impedance referred to the primary, and (d) the real and reactive power supplied to the primary winding.A transformer has a ratio of 4:1. The high voltage side is connected to a 240 Vrms source. The low voltage side (secondary) is connected to an impedance ZL = 20 + j10 Ω.a. What is the value of the load impedance when referred to the primary?b. (in A rms) What is the current out of the source?A Step-Down Transformer. A transformer connected to a 120 V (rms) ac line is to supply 12.0 V (rms) to a portable electronic device. The load resistance in the secondary is 5.00 Ω. (a) What should the ratio of primary to secondary turns of the transformer be? (b) What rms current must the secondary supply? (c) What average power is delivered to the load? (d) What resistance connected directly across the 120 V line would draw the same power as the transformer? Show that this is equal to 5.00 Ω times the square of the ratio of primary to secondary turns.
- A 400-turns auto transformer, operating in the step-down mode with 25 percent tap supplies a 4.8 kVA, 0.85 lagging power factor load. The input to the transformer is 2400 V, 60 Hz. Neglect the small losses and leakage effects. What will be the apparent power(in kVA) conducted and transformed respectively?A transformer has a ratio of 4:1. The high voltage side is connected to a 240 Vrms source. The low voltage side (secondary) is connected to an impedance ZL = 20 + j10 Ω.a. (in Vrms) What is the value of the source voltage when referred to the secondary? b. (in A rms) What is the current at the secondary?c. (in V rms) What is the voltage at the secondary?Given the transformer circuit below, a load of 2.5cis20° Ohms is connected to the output terminals of the transformer. If the voltage across the load is 230V, determine the following:a. ILb. IMc. ICd. Source voltage, V
- Using the parameters from the Typical Transformer Values Sheet for a 12.4kV/600V, 100 kVA transformer operating at its rated voltage on the secondary side with its rated load with a PF of 0.8 lagging. Determine for each of the transformer models – deluxe, medium, and economy: Draw the circuit diagram. Find: The magnitude of voltage at the input to the primary side, The power factor on the primary side, The reactive power absorbed by the transformer, The efficiency of the transformer, The voltage regulation of the transformer.As given in the figure, an ideal transformer with a 2: 1 winding ratio is fed from a 240 Volt source with an internal impedance of 8 + j6 Ω and transfers maximum power to the load impedance connected at its secondary. So, which of the following is the V2 voltage in the secondary?A transformer outside of a business steps the average voltage down from V1 to V2. The transformer delivers an amount of power, P2, to the business at an efficiency of e. Which equation below will provide the amount of current provided to the primary coil?
- 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?Derive the power angle equation for a power system network and draw the corresponding curve.Consider an ac network with an ideal transformer (with turns ratio of n:1) shown below where ZL=(1+j0) is the load impedance and Zs=(7−j24). Ideal transformer turns ratio n is chosen so that the average power delivered to the load is maximized. Under this scenario, the average power delivered to the load is given by