A 20 KVA transformer has a maximum efficiency of 98% when delivering three quarter load at 1.0 pf. Determine the energy efficiency of the transformer if it is loaded as follows: NL for 12 hrs: 12 kW, 0.8 pf for 6 hrs and 20 kW, 1.0 pf for 6 hrs. Your answer

A 20 KVA transformer has a maximum efficiency of 98% when delivering three quarter load at 1.0 pf. Determine the energy efficiency of the transformer if it is loaded as follows: NL for 12 hrs: 12 kW, 0.8 pf for 6 hrs and 20 kW, 1.0 pf for 6 hrs. Your answer

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 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

See similar textbooks

Related questions

Q: How to make the bridge output (Vo) equal to zero? explain? 2- Write some applications for the Strain...

A: Without a section on bridge circuits, no text on electrical metering would be complete. These clever...

Q: Given : VT - Vm sin wt f = 60HZ Vm = 310V (2) R4 = 28 2 L, e 0.06 H Find : (a) RMS calculated vo Hag...

Q: Let P be the solution of the Lyapunov equation ATP+ PA = -Q, where A, P,Q E R"X". Show that if = P" ...

A: GIVEN: Lyapunov equation ATP+PA=-Q SHOW: all eigenvalues of A have negative real parts

Q: In a three-phase system, the per-unit symmetrical components of the phase currents are IO = 0.5 , I9...

Q: 1. A plot of the magnitude of the transfer function, G(jo), as a function of the frequency is given ...

Q: Determine the currents and voltages across all the resistances indicated in the circuit shown below.

A: It is given that:

Q: 4.87 O Consider the circuit of Fig. P4.39 with R1 = 10k2. The diodes have turn-on voltages of Vf = R...

A: According to the question, for the given as shown below We need to find (a) Smallest value of V1 an...

Q: Consider the following signal x(t) = 8(t + 2) - 8(t – 2) Find and plot y(t), where y(t) = %3|

A: The given signal is shown below: xt=δt+2-δt-2

Q: 13. Refer to the graphic D. What is the resistance seen by the power supply?

A: The given circuit is shown below:

Q: Find the current on RL using Thevenin method

A: Find the current on RL using Thevenin method

Q: A 4 KVA, 200/400, single phase transformer has equivalent resistance and reactance referred to low v...

A: In this question we need to find a terminal voltage at HV side and efficiency of transformer for giv...

Q: 30 k2 Vs 50 μF 10 mH 50 k2

Q: Describe with the aid of a diagram how LVDT transducer may be used to measure pressure using bellows

A: A linear variable differential transformer is an electrical transformer that is used to measure line...

Q: 2. Total current in a semiconductor is constant and is composed of electron drift current and hole d...

Q: A 120V adjustable frequency ac source is connected in series with a resistor, an inductor, and a cap...

Q: G. Use this graphic for Questions 18 and 19 R2 R1 6kQ 2kQ R3 RL 2kQ V1 80V

Q: A two-pole Y-connected synchronous generator has a voltage level of 2300 V, a capacity of 1000 kVA, ...

A: Given P=2 V=2300 V S=1000 kVA pf=0.8 lagging Ra=0.15 Ω Xa=1.1 Ω f=50 Hz PFW=24 kW Pcore=18 kW

Q: At 300 K, an ideal solar cell has a short circuit current of 3A and an open circuit voltage of 0.6V....

Q: (a) v = 100 sin (wt + 30°) i = 10 sin (wt + 60°) (b) v = 100 sin (wt + 30°) i = 10 sin (wt - 30°) (c...

Q: Find the force on a conductor 90 cm long, carrying a current of 2 A and is situated perpendicular to...

A: We know that whenever a current carrying conductor placed in a magnetic field some force exerts on i...

Q: 2. Two capacitors in parallel, 2-µF and 4-uF are connected in series with a 3-µF capacitor. The comb...

Q: 11. Refer to the graphic C. Answer the following question. The circuit has a total current of 100 mA...

A: Given Total power P=8W Total current i=100mA =0.1A

Q: For the circuit in Fig. 4.76, find the terminal voltage Vab using superposition. 4.8 3V ab 102 o a 4...

Q: +20 V Re || R A, : Rc 12 KΩ R 150 k R 50 k hFE = 200 R2 20 k RE 2.2 k

Q: Three point charges Q1=20 nC, Q2=-15 nC, and Q3=45 nC are enclosed in a closed surface. Determine th...

Q: Consider a silicon p-n junction solar cell of area 2 cm^2. If the dopings of the solar cell are NA=1...

Q: A. Use this graphic for Questions 3, 4, 5, and 6. V, = 36 Volts R1 R2 .023ka .023MO Vs ŽR3 R5 R4 .23...

Q: D5 15 12 ID6 Calculate: a. I2 b. ID6 V R2 D6 20V 3.3k2 c. I5

A: In this question, We need to determine the value of current in the diodes D5 and D6. Assume forwar...

Q: 43. Using Thevenin's theorem, find the current in 10 Q resistor in the circuit shown. * 40 Ω 60 Ω 12...

Q: B. Obtain the transfer function for the op-amp circuit shown Figure 2 100 2 100 2 I F (の 100 2IF

Q: z[n] + 2z[n - 1] = y[n] + 2y[n - 2] The expression above defines the relationship between the outpu...

Q: What is the difference between a common source amplifier and a common gate amplifier?

A: Brief description : In the above given question there want to have a discussion on MOSFET amplifiers...

Q: c) The Pseudoternary digital encoding scheme alternates between positive and negative voltage levels...

A: The received digital signal is shown below,

Q: For the follower circuit, let transistor Q1 have β = 50 and transistor Q2 have β = 100, and neglect...

A: Brief description: In the above given circuit diagram we need to calculate the values of DC emitter ...

Q: Which of the following is used to reduce the compounding of a DC generator? O Inverter Diverter Comm...

Q: Practice Problem 1.3 A 100 kVA transformer 7,621/230 - Volt has primary and secondary resistances of...

Q: dx + 7x = 5 cos 2t dt

Q: 1000 208V 400H z 3uF For the circuit given, what is the current?

A: we have given R=100ΩC=3μFAc source 208V ,400Hz

Q: In a parallel RL circuit, R = 10 , L = 40 mH and v = 110 sin(377t + 45) V. Find i.

Q: 30 R2 9V 20 R3 10

Q: Q1 1) Determine the expresion for i wattmets w' = 50 sin (314t) + 40 sin (g42t) ond the rading f し- ...

Q: If "1 = 2a, – ay + az r2 = ax +3ay – 2az r3 = -2ax + ay – 3az and r4 = 3ag + 2ay + 5az find scalars ...

Q: Matching Type. Match each item to a choice: A vector drawn from the origin up to a certain point in ...

A: A vector drawn from the origin upto a certain point in space is called separation vector Scalar re...

Q: On a three phase system with voltages greater than 600V the typical color used to designate phase Z(...

A: ORANGE COLOR

Q: 36. Sketch ig and v, for the network of Fig. 2.180 for the input shown. 10 k2 10 V Si Si Vi 5.3 V= 7...

Q: ri = 3a, – 2ay + az r2 = 2a, – 4ay – 3a, r3 = -ax + 2ay + 2az Given Find the magnitudes of: Match ea...

A: Brief description : In the given question they have mentioned some vector fields of having position ...

Q: Hello! I need to explain why ncr = ncn-r. Can also be stated as n (c,r) = c (n,n-r)

Q: 9. Given D = 5x2 ax + 10z az C/m2, find the net outward flux crossing the surface of a cube 2m on ed...

A: The solution is given below

Q: PROBLEM: From Block Diagram to SFG. Mason's Gain Formula & Superposition Consider the CL system with...

Q: The conduction band is closest to the valence band in Select the correct response: semiconductors in...

Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

A 20 KVA transformer has a maximum efficiency of 98% when delivering three
quarter load at 1.0 pf. Determine the energy efficiency of the transformer if it is
loaded as follows: NL for 12 hrs; 12 kW, 0.8 pf for 6 hrs and 20 kW, 1.0 pf for 6 hrs.
Your answer

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A 20 KVA transformer has a maximum efficiency of 98% when delivering three quarter load at 1.0 pf. Determine the All-day efficiency of the transformer if it is loaded as follows: NL for 12 hrs; 12 kW, 0.8 pf for 6 hrs and 20 kW, 1.0 pf for 6 hrs.
15. Find the efficiency of a 150 kVA transformer at 25 % full load at 0.8 p.f. lag if the copper loss at full load is 1600 W and the iron loss is 1400 W. Ignore the effects of temperature rise and magnetizing current. Round your answer to two decimal places. Write your answer on the space provided.
11.The F.L. Cu loss and iron loss of a transformer are 920 W and 430 W respectively. Calculate the loading of the transformer at which efficiency is maximum
Each motor is rated at 80 hp but is only loaded mechanically as follows: Motor # % Loading 1 40 2 50 3 70 The relationship between % of full load for each motor and efficiency (they are all the same) is given by the graph below: a) What is the minimum required transformer rating in kVA? b) By what percentage could the required transformer rating be reduced if a capacitor bank were installed in parallel with the motors, improving the power factor of the loadcentre to unity?
A 2300/230 V distribution transformer is delivering a load of 50 kW to a certain part of a community. If the total wire impedance is .05 Ω, what power is actually dellvered? Ans. 47.64 kW
The primary and secondary windings of a 500 kVA transformer have resistances of 0.44 Ω and 0.0027 Ω, respectively. The rated primary and secondary voltages are 11013 V and 473 V, respectively and the core loss is 2.9 kW. Assuming the power-factor of the load to be 0.8, calculate the output at which the efficiency is a maximum. Give your answer in kVA correct to 2 decimal places.
A 200 kva transformer has an efficiency of 98% at full load. If the max. efficiency occurs at three quarters of full load, calculate the efficiency at half load. P.f. of 0.8 at all loads.
10. In a 25KVA, 2000 / 200 V power transformer, the iron and full load copper losses are 350W and 400W respectively. Calculate the efficiency at unity power factor at (i) full load and (ii) half load.
Find the all-day efficiency of a 500 kVA distribution transformer whose copper loss and iron loss at full load are 4.5 kW and 3.5 kW respectively. During a day of 24 hours, it is loaded as follows: 6 hours, 400 kW, 0.8 pf; 10 hours, 300 kW, 0.75pf; 4 hours, 100 kW, 0.8 pf and no-load for 4 hours. Provide the following parameters in order: Wcu, Wco, Wout, Eff ALL-DAY
????????????:• Write the GIVEN with their respective symbols and units.• Do not skip the SOLUTIONS, do it step-by-step with their respective symbols and units???????:Calculate the all-day efficiency of a 100-KVA transformer operating under the following conditions:6 hour, 50 kW, 0.73 pf3 hours, 90 kW, 0.82 pfIron loss = 1000 wattsOne quarter load Copper loss = 66.25 wattsa) The rest of the day, transformer running idleb) The rest of the day, primary disconnected from the source.
A 220/400 V, 10 KVA, 50 Hz, single phase transformer has copper loss of 120 W at full load. If it has an efficiency of 98% at full load, unity power factor, determine the iron losses. What would be the efficiency of the transformer at full load at 0.8 power factor lagging? KINDLY SOLVE PLZ. THANX!!!!!
A 25 kVA, 13,800/240 V distribution transformer has full load efficiency of 97% at unity power factor at which the core loss is 80% (copper loss). The transformer operates over a 24 hour period as follows: 22.5 kW load 0.9 pf lagging for four hours; 12.5 kW load, unity pf for two hours; 6.25 kW load, unity pf for eight hours and no load for ten hours. Solve for the all day efficiency of the transformer.