a) If the electrical power required for a house is assumed to be 5kW, the requirement of 1500xy houses A HEPP with the installed capacity to meet the needs will be established. This installed power includes 7 generators and It will be provided from the penstock pair. Net water head 190 m and penstock calculated for the facility 91% efficiency, 85% turbine efficiency, 96% generator efficiency, transformer efficiency It is calculated to be 93%. Calculate the required water flow for each force. (ρ: specific weight: 1000kg /m³, g: Gravitational acceleration: 9.81 m/s² ) b)In this example, if the total efficiency of the system could be increased to 85%,how is the required water flow would be affected? Show it by calculating.

a) If the electrical power required for a house is assumed to be 5kW, the requirement of 1500xy houses A HEPP with the installed capacity to meet the needs will be established. This installed power includes 7 generators and It will be provided from the penstock pair. Net water head 190 m and penstock calculated for the facility 91% efficiency, 85% turbine efficiency, 96% generator efficiency, transformer efficiency It is calculated to be 93%. Calculate the required water flow for each force. (ρ: specific weight: 1000kg /m³, g: Gravitational acceleration: 9.81 m/s² ) b)In this example, if the total efficiency of the system could be increased to 85%,how is the required water flow would be affected? Show it by calculating.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.41P: Consider the single-line diagram of the power system shown in Figure 3.38. Equipment ratings are...

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In developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across a transformer, the voltage base is changed in proportion to the transformer voltage ratings. (a) True (b) False
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Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
Consider the single-line diagram of the power system shown in Figure 3.38. Equipment ratings are Generator 1: 1000MVA,18kV,X=0.2perunit Generator 2: 1000MVA,18kV,X=0.2p.u. Synchronous motor 3: 1500MVA,20kV,X=0.2p.u. Three-phase -Y transformers T1,T2,T3,T4,: 1000MVA,500kV,Y/20kV,X=0.1p.u. Three-phase YY transformer T5: 1500MVA,500kV,Y/20kVY,X=0.1p.u. Neglecting resistance, transformer phase shift, and magnetizing reactance, draw the equivalent reactance diagram. Use a base of 100 MA and 500 kV for the 50-ohm line. Determine the per-unit reactances.
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Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.
A 100 KVA, 2000/200V 1-phase 2-winding Transformer is to be used as an auto transformer for stepping up the voltage from 2000 V to 2200 V. At rated load, the 2-winding Transformer has 2.5% loss, 3% voltage regulation & 4% impedance for an auto transformer determine (a) Voltage & current rating (b) KVA rating (c) Effiiency (d) Percentage impedance (c) Voltage regulation (f) Short circuit current on each side.
Two transformers A and B of different ratings but equal voltage ratios share a load of 900 kVA at 0.8 power factor lagging at 400 V by operating in parallel. Transformer A has a rating of 600 kVA, resistive drop of 1% and reactance drop 5%. Transformer B has a rating of 300 kVA, resistive drop of 1.5% and reactance drop of 4%. Calculate the load shared by each transformer and the power factor at which it is working.
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Quiz2: We wish to connect a 6 KVA, 120/240 V transformer as an autotransformer to a 120 V source to supply 360 V toa load. ) Draw the circuit. b) What is the maximum load KVA that can be supplied? ©) Atthe maximum|oad, determine /Iy, and I, &) What are the possibilities to connect it as a stepdown autotransformer and determine the load voltage at each case?
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