A transformer bank is composed of three single-phase transformers of10kVA, 20kV/200V; copper losses are 100 W and core lossesthey are 50 W. The bank is connected in Delta on the high voltage side and in star on the sidethe low-voltage side. A. What are the values of voltages B.What are the values of currents C. losses in the core and losses in copper. D. nominal power of the transformer bank.Solve by one of the experts, not using artificial intelligence

A transformer bank is composed of three single-phase transformers of10kVA, 20kV/200V; copper losses are 100 W and core lossesthey are 50 W. The bank is connected in Delta on the high voltage side and in star on the sidethe low-voltage side. A. What are the values of voltages B.What are the values of currents C. losses in the core and losses in copper. D. nominal power of the transformer bank.Solve by one of the experts, not using artificial intelligence

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 3.11MCQ: For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the...

See similar textbooks

Similar questions

Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.
For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
An ideal transformer has no real or reactive power loss. (a) True (b) False
A bank of three single-phase transformers, each rated 30MVA,38.1/3.81kV, are connected in Y- with a balanced load of three 1, Y-connected resistors. Choosing a base of 90MVA,66kV for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
Please solve the problem i want urjent
A voltage transformer in Figure 8 has 1,500 turns of wire on its primary winding and 500 turns of wire for its secondary winding. What will be the turns ratio, a of the transformer. If 240 volts is applied to the primary winding, what will be the resulting secondary voltage. And if a 400 n resistor is connected to the secondary winding, what are the values of current Is and Ip. primary Vp Transformer Core NF Ns Figure 8 secondary Vs
a. The core of a three phase, 50 Hz,11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb.Find (i) number of H.V and L,V turns per phase, $(ii)$ e.m.f per turn (iii) full load H.V and LV turns per phase.
The amount of inrush current in the primary of a transformer is limited by the........, A- amount of applied voltage, B- resistance of the wire in the primary winding, C- flux change of the magnetic field in the core, D - all of the above What precaution must be observed when working whit current transformers? A- never have a load on the secondary, B- always ha a load on the secondary, C- de-energize the primary whenever there is a load on the secondary, D - none The fact that the movable coil of a constant-current transformer moves further away from the stationary coil with a increase in load current is based on which fundamental priciple of magnetism? A- like magnetic poles attract, B- like magnetic poles repel, C- the amount of current flowing through a coil inverdely proportional to its flux density. D- none
The circuit diagram of a wye wye transformer is shown below. It has a neutral to ground resistor in the right side winding. Again, the transformer turns ratio is 1 in this problem. Calculate the currents IA, IB and IC for the zero sequence currents Ia=Ib=Ic=1/0o Calculate the current in neutral resistor Rn, and the voltage across this resistor. Calculate the neutral to ground current in the right side winding. What is the value of the neutral to ground current in the right side winding when Rn is replaced by an open circuit? Draw the zero sequence circuit of this transformer, and show the zero sequence current flow in this diagram when Rn is finite.
A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?
Solve all with type solution. plz don't copy