1. what are the stand by losses in power transformers? i) how to calculate those losses...
1. what are the stand by losses in power transformers?
i) how to calculate those losses ?
ii) how can avoid stand by losses in power transformers?
iii) what are the disadvantages and advantages of stand by losses in power transformers?
iv) example case study for stand by losses?
v) how to effect stand by losses for current bill.... (Economy, durability of transformer... )
Homework Answers
Add Answer to:
1. what are the stand by losses in power transformers?
i) how to calculate those losses...
a) Transformers work by the Principle of Electromagnetic Induction. Briefly explain this to a layman. b)...
a) Transformers work by the Principle of Electromagnetic Induction. Briefly explain this to a layman. b) i. [2 marks] [1 mark] State the two (2) types of losses in a transformer and also state where in the [2 marks] State two (2) advantages of an auto-transformer over an ordinary [2 marks] State why DC voltages do not work in transformers. 11. transformer these losses can be found. 111. transformer. c) Explain briefly why electric power is transmitted at very high...
e. What of curent and potential transformers in power system protection. g off a 400 V,...
e. What of curent and potential transformers in power system protection. g off a 400 V, s0 Hz supply is developing 10 kW with an efficiency of A single-phase motor operatin 94 percent and a power factor (p.f) 0.7 lagging L. the input apparent power iä the active and reactive components of the current; ii the reactive power (in kilovars) iv. Draw the power triangle . Using Phasor dingram, the capacitance required in parallel with the motor of to raise...
Q2(a) Consider the circuit shown in Figure Q2a. Find the power delivered resistor. i. Calculate the...
Q2(a) Consider the circuit shown in Figure Q2a. Find the power delivered resistor. i. Calculate the total resistance ii. Calculate the total current iii. Calculate the current in each branch iv. Calculate the voltage drop in each resistor v. Calculate the power delivered to each resistor. 2.012 20 V 1.022 3.0 22 w 4.0 52
1. A single-phase power system consists of a 480-V 60-Hz generator supplying a load of Zload...
1. A single-phase power system consists of a 480-V 60-Hz generator supplying a load of Zload = 4 + j3 2 through a transmission line of impedance Zline = 0.18 + 0.24 2. (a) (i) If the power system is exactly as shown in Fig. P3.1, calculate the line current voltage at the load. (ii) Calculate the transmission line losses. (b) Suppose a 1:10 step-up transformer is placed at the generator end of the transmission line and 10:1 step-down transformer...
Transfomers
A large transformer operating at no-load draws an exciting current of 5 Awhen the primary is connected to a 240 V, 50 Hz source. From wattmeter testit is known that the iron losses are equal to 300 W. At short circuit the voltage applied is 24 Volts , the short-circuit current is 35 Amperes, the power meter reads 400 W. Calculate:i) The reactive power absorbed by the core;ii) The value of Rc and Xm of the magnetising branch; iii) The...
A large transformer operating at no-load draws an exciting current of 5 A when the primary is connected to a 240 V, 50 Hz source (HELP)
Question 1: A large transformer operating at no-load draws an exciting current of 5 Awhen the primary is connected to a 240 V, 50 Hz source. From wattmeter testit is known that the iron losses are equal to 300 W. At short circuit the voltage applied is 24 Volts , the short-circuit current is 35 Amperes, the power meter reads 400 W. Calculate:i) The reactive power absorbed by the core;ii) The value of Rc and Xm of the magnetising branch; iii)...
1. [20 points] Choose the right answer. a) If phase current of a wye-connected three-phase system...
1. [20 points] Choose the right answer. a) If phase current of a wye-connected three-phase system is equal to Ipu, then the line current of the same system is equal to V3 pu. i. True ii. False b) A synchronous generator is supplying power to a load with unity power factor at 60 Hz. The load is suddenly disconnected (tripped). What would happen to the internal generated voltage, EA? i. Same as before ii. Increase iii. Decrease c) What is...
Capacitor is connected to secondary (1) A fullwave bridge rectifier power supply is powered from the secondary of a transformer which has a peak secondary voltage of 22V. The primary of the transforme...
Capacitor
is connected to secondary
(1) A fullwave bridge rectifier power supply is powered from the secondary of a transformer which has a peak secondary voltage of 22V. The primary of the transformer is connected to a 50Hz, 230Vus power supply. A 2700μF filter capacitor is used. A current of 1.5 Amp is drawn from the supply (i) Sketch a schematic diagram of the setup (ii) Calculate the mean dc output voltage (ii) Assume that each diode conducts for one-twelfth...
please answer all questions from i to vi. ULIUS 1. Explain how a fuse saving scheme...
please answer all questions from i to vi.
ULIUS 1. Explain how a fuse saving scheme is performed using a reciose. ii. What is a sectionalizer and how does it work is a sectionalizer and how does it work in coordination with a recloser? 111. Explain the effect of the magnetizing inrush current on transformer IV. Explain how transformer core faults, inter-turn faults and oil leaks be detected. V. Show the wiring diagram of a differential relay to protect a...
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω...
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω and shunt field resistance 100 Ω. The rotational losses are 200 W. On full load the line current is 25 A and the motor runs at 1800 rpm. Determine: (i) the developed mechanical power (ii) the output power (iii) the output torque (iv) the efficiency at full load 2. A 120 V series motor has 0.2 Ω field resistance. On full load, the line...
a) Transformers work by the Principle of Electromagnetic Induction. Briefly explain this to a layman. b) i. [2 marks] [1 mark] State the two (2) types of losses in a transformer and also state where in the [2 marks] State two (2) advantages of an auto-transformer over an ordinary [2 marks] State why DC voltages do not work in transformers. 11. transformer these losses can be found. 111. transformer. c) Explain briefly why electric power is transmitted at very high...
e. What of curent and potential transformers in power system protection. g off a 400 V, s0 Hz supply is developing 10 kW with an efficiency of A single-phase motor operatin 94 percent and a power factor (p.f) 0.7 lagging L. the input apparent power iä the active and reactive components of the current; ii the reactive power (in kilovars) iv. Draw the power triangle . Using Phasor dingram, the capacitance required in parallel with the motor of to raise...
Q2(a) Consider the circuit shown in Figure Q2a. Find the power delivered resistor. i. Calculate the total resistance ii. Calculate the total current iii. Calculate the current in each branch iv. Calculate the voltage drop in each resistor v. Calculate the power delivered to each resistor. 2.012 20 V 1.022 3.0 22 w 4.0 52
1. A single-phase power system consists of a 480-V 60-Hz generator supplying a load of Zload = 4 + j3 2 through a transmission line of impedance Zline = 0.18 + 0.24 2. (a) (i) If the power system is exactly as shown in Fig. P3.1, calculate the line current voltage at the load. (ii) Calculate the transmission line losses. (b) Suppose a 1:10 step-up transformer is placed at the generator end of the transmission line and 10:1 step-down transformer...
1. [20 points] Choose the right answer. a) If phase current of a wye-connected three-phase system is equal to Ipu, then the line current of the same system is equal to V3 pu. i. True ii. False b) A synchronous generator is supplying power to a load with unity power factor at 60 Hz. The load is suddenly disconnected (tripped). What would happen to the internal generated voltage, EA? i. Same as before ii. Increase iii. Decrease c) What is...
Capacitor
is connected to secondary
(1) A fullwave bridge rectifier power supply is powered from the secondary of a transformer which has a peak secondary voltage of 22V. The primary of the transformer is connected to a 50Hz, 230Vus power supply. A 2700μF filter capacitor is used. A current of 1.5 Amp is drawn from the supply (i) Sketch a schematic diagram of the setup (ii) Calculate the mean dc output voltage (ii) Assume that each diode conducts for one-twelfth...
please answer all questions from i to vi.
ULIUS 1. Explain how a fuse saving scheme is performed using a reciose. ii. What is a sectionalizer and how does it work is a sectionalizer and how does it work in coordination with a recloser? 111. Explain the effect of the magnetizing inrush current on transformer IV. Explain how transformer core faults, inter-turn faults and oil leaks be detected. V. Show the wiring diagram of a differential relay to protect a...
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