Question

In: Electrical Engineering

A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of...

A single-phase transformer of 3 kVA, 60 Hz, has a voltage ratio on open circuit of 240 / 120 V. The primary and secondary resistances are 0.25 Ω and 0.05 Ω respectively, the corresponding leakage reactance being 0.75 Ω and 0.18 Ω. The transformer delivers current to the load at a 0.9 power factor lagging.

  1. Determine the voltage across the load.                                                                  
  2. Determine the power dissipated by the load.                                                         
  3. Determine percentage voltage regulation referred to the secondary side.

Solutions

Expert Solution


Related Solutions

A single-phase transformer 5 kVA, operating at 50 Hz frequency has turns ratio of 20. The...
A single-phase transformer 5 kVA, operating at 50 Hz frequency has turns ratio of 20. The primary and the secondary winding resistances are 0.15 Ω and 0.025 Ω respectively, and the primary and secondary leakage reactances are 0.65 Ω and 0.15 Ω respectively. The magnetizing inductance and core loss resistance are 6 Ω and 1 Ω respectively. i. Calculate the primary and secondary impedances referred to primary and sketch the APPROXIMATE equivalent circuit. (Note: please show all parameters in the...
A single-phase 300-kVA, 220/4400 V, 60 Hz transformer yielded the following information when tested: High voltage...
A single-phase 300-kVA, 220/4400 V, 60 Hz transformer yielded the following information when tested: High voltage winding open: Voltage=220 V, Current=40 A Power=l 000W Low voltage terminal shorted: Voltage= 195 V, Current=68.18A Power=4000W Find the equivalent circuit of the transformer as viewed from the high voltage Calculate the .efficiency of the transformer when it delivers its rated load at rated terminal voltage and 8 power factor lagging.
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8...
The efficiency of a 400-kVA, single-phase, 60-Hz transformer is 98.77% when delivering full-load current at 0.8 power factor, and 99.13% with half-rated current at unity power factor. calculate: (a) The iron loss. (b) the full-load copper loss. (c) the efficiency at 3/4 load, 0.9 power factor
4.11)The equivalent circuit parameters of a 150 kVA, 2400 V/ 240 V, 60 Hz transformer are...
4.11)The equivalent circuit parameters of a 150 kVA, 2400 V/ 240 V, 60 Hz transformer are as follows: RHV = 0.21Ω, RLV = 2mΩ, XlHV = 0.45Ω, XlLV = 4.6mΩ, XmHV = 1.6kΩ, and RcHV = 12kΩ. The transformer delivers to a load, rated current at a power factor of 0.85 lagging at rated voltage. Determine the input voltage, current, apparent power and power factor, (a) using the approximate equivalent circuit, and (b) not using the approximate equivalent circuit. Problem...
Problem 3: A single phase 60 Hz two-winding power transformer is rated at 2400V/240V and 100...
Problem 3: A single phase 60 Hz two-winding power transformer is rated at 2400V/240V and 100 kVA with Zeq = 0.5 + j0.8 Ohm. If an autotransformer is built from this conventional transformer to supply a load at 2640V with supply voltage 2400V. Draw the autotransformer and calculate Zeq, the voltage, current and apparent power rating of the auto transformer. Also calculate the apparent power rating advantage of autotransformer over conventional transformer.
A single phase, 300???, 11??/2.2??, 60 ?? transformer has the following parameters referred to the high-voltage...
A single phase, 300???, 11??/2.2??, 60 ?? transformer has the following parameters referred to the high-voltage side: ?? = 57.6??, ?? = 16.34??, ??? = 2.784? and ??? = 3.5?. If a load of ????? = 16∠30°? connected to the low-voltage side: a) Find the voltage regulation? b) Draw the phasor diagram? c) Find the efficiency of the transformer? d) Repeat part a and b at ????? = 16∠ − 30°??
Exercises 1. A 25 kVA single-phase transformer has the primary and secondary number of turns of...
Exercises 1. A 25 kVA single-phase transformer has the primary and secondary number of turns of 200 and 400, respectively. The transformer is connected to a 220 V, 50 Hz source. Calculate the (i) turns ratio, and (ii) mutual flux in the core. 2. A 25 kVA, 2200/220 V, 50 Hz single-phase transformer’s low voltage side is short-circuited and the test data recorded from the high voltage side are P=150 W, I1 = 5A and V1 = 40 V. Determine...
The 500 KVA, 69kV/11kV, 60 Hz transformer has total resistance Rp of 100 Ω and total...
The 500 KVA, 69kV/11kV, 60 Hz transformer has total resistance Rp of 100 Ω and total leakage reactance of Xp of 600 Ω. Calculate The per unit impedance of the transformer in percent (just magnitude) The voltage regulation of the transformer when it delivers 200 KVA with a lagging power factor of 90% while the secondary voltage is fixed at 11 kV. The actual primary voltage V1. The actual line current I1.
A 6kVA, 220 /24V, 50Hz single-phase transformer has the following test results: Open circuit test (measured...
A 6kVA, 220 /24V, 50Hz single-phase transformer has the following test results: Open circuit test (measured form high-voltage side): V(oc) = 220V, I(oc) = 5A, P(oc) = 150W Short circuit test (measured from low-voltage side): V(sc) = 10V, I(sc) = 28A, P(sc) = 250W Find the per-unit approximate equivalent circuit parameters of the transformer.
A 350-KVA 2300  230; volt, 60-hz transformer has percent core loss, resistance and percent leakage reactance of...
A 350-KVA 2300  230; volt, 60-hz transformer has percent core loss, resistance and percent leakage reactance of 0.56 , 33 and 5.57 respectively. For 10 degree increments of power-factor angle, tabulate and plot percent regulation, and efficiency. Power factor for operation between 0.5 lagging and 0.5 leading.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT