A commercial Building, 60hz, Three Phase System, 230V with total highest Single Phase Ampere Load of 1,160 Amperes, plus the three-phase load of 201Amperes including the highest rated of a three-phase motor of 20HP, 230V, 3Phase, 54Amp Full Load Current. Determine the Transformer and Generator Size.

A commercial Building, 60hz, Three Phase System, 230V with total highest Single Phase Ampere Load of 1,160 Amperes, plus the three-phase load of 201Amperes including the highest rated of a three-phase motor of 20HP, 230V, 3Phase, 54Amp Full Load Current. Determine the Transformer and Generator Size.

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

Chapter10: System Protection

Section: Chapter Questions

Problem 10.30P

See similar textbooks

Similar questions

The motors M1andM2 of Problem 3.45 have inputs of 120 and 60 MW, respectively, at 13.2 kV, and both operate at unity power factor. Determine the generator terminal voltage and voltage regulation of the line. Neglect transformer phase shifts.
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.
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.
An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer of Problem 3.53. A 7.5-MVA,13.2-kV synchronous motor with a sub transient reactance of 0.2 per unit is connected to the transformer secondary. A5-MW,2.3-kV three-phase resistive load is connected to the tertiary Choosing a base of 66 kV and 15 MVA in the primary, draw the impedance diagram of the system showing per-unit impedances. Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.
17. A transformer rated 300 kva with the high-voltage winding designed for 2300 volts will most probablybe aA. power transformer with shell-form core.b. distribution transformer with cylindrical coils.c. distribution transformer with disk coils.
A 10-kVA, 2200/400 V, single phase distribution transformer has a primary and secondary winding impedances of 5 + j12 and 0.25 + j0.45 ohms, respectively. Calculate the voltage across the secondary terminals at full load, 90 % power factor lagging, when the primary is supplied with 2200 volts?
2. An open delta transformer bank server a balance 3 phase load of 70 kVA at 240 volts and phase angle of 30 degrees lagging. Calculate the real, reactive, apparent powers and pf at which each transformer is operating.
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-downtransformer at the load end of a 2400-volt feeder whose series impedance is 1.0 + j2.0 ohms.The equivalent series impedance of the transformer is 1.0 + j 2.5 ohms referred to the high- voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary voltage. Neglecting the transformer exciting current, determine a. the voltage at the transformer primary terminals,b. the voltage at the sending end of the feeder, andc. the real and reactive power delivered to the sending end of the feeder
Q2: A 5kVA, 200/400V, 50Hz single phase transformer gave the following test figures: No-load: (Low-voltage data): 200V, 60W, 0.7A. Short-circuit:(high-voltage data): 9V, 6A, 21.6W. Calculate: a/ the magnetizing current and the component corresponding to iron loss at normal voltage and frequency. b/ the efficiency on full load at unity power factor. c/ the secondary terminal voltage on full load at power factor of unity, 0.8 lagging and 0.8 leading
2) A three -phase transformer of 90 kVA, 13200/480 V (line to line), with connection Delta-Delta, has a resistance of 1.3% and a reactance of 8.2% per unit. a) Calculate the phase impedance of the transformer referred to the high side strain. b) Calculate the phase impedance of the transformer referred to the low side strain. c) Calculate the transformer voltage regulation into nominal conditions with F.P.0,8 in delay.
consider a Y/D connected 30 MVA , 18/220 KV transformer with differential protection applied , for current transformer ratios 3000/5 A in primary and 200/5 secondary . Calculate the relay currents on full load . Find the minimum relay current setting to allow 150 percent overload also draw the diagram of transformer connection
A 300-kVA, 460-V, balanced three-phase load is supplied by three single phase transformers connected in Δ/Y to form a three-phase transformer. The primary winding of the three-phase transformer is connected to a 4.8 kV, three-phase transmission line. Determine (a) the rated primary voltage and current, (b) the rated secondary voltage and current, and (c) the power rating of each transformer. -What are the primary and secondary line currents?