Three non-reactive loads are connected in delta across a three-phase, three-wire 400V supply in the following way:⚫10 kW between the red and yellow lines;• 6 kW between the yellow and blue lines; and• 4 kW between the blue and red lines.Two wattmeters are available to measure the total power drawn by the three-phaseload. If the current coil of one of the wattmeter (W₁) is connected in the red line,and its voltage coil connected across the red and yellow lines, calculate:i. The power measured by wattmeter, W₁.ii.The power that would be measured by the other wattmeter (W2) if it wascorrectly connected.iii. The overall power factor of the three-phase load.

i) To calculate the power measured by wattmeter W1, we need to understand that in a balanced…

Answered: Three non-reactive loads are connected…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A single phase 11 kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the line is 0·5 Ω/km and the resistance is 0·3 Ω/km. Calculate the efficiency and regulation of the line for 0·8 lagging power factor. [97·74%, 3·34%]
Transmission and Distribution of Electric Power Answer the Following Question Please: Q) Three-phase transmission line, 60HZ, have: (50 MW, 0.866 lagging p.f. and 132 kv in receiving end. If the line have (Z = 100 <80 Ohm / phase and Y = 0.0012 <90 S). Calculate: Vs, Is, Vreg, and power factor in sending end. Also, find the transmission efficiency? For the following transmission models: 1- Short transmission line model. 2- Medium transmission line (pi) model. 3- Medium transmission line (T) model. 4- Long transmission line model. (Please show your answer steps)
A single – phase transmission line supplies a reactive load at a lagging power factor. The load draws 1.2 pu current at 0.6 pu voltage while drawing 0.5 pu (true) power. If the base voltage is 20 kV and the base current is 160 A, calculate the power factor and the ohmic value of the resistance of the load.
S.4) the length of a three-phase power transmission line with a Nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/km. From the end of the line, a 56 MW star connected load is fed with a power coefficient of 0.8 back under a 64 kV interphase voltage. If the line head voltage of the transmission line is 69 kV, calculate the capacity and power of the star-connected capacitor to be shunted into the load connected to the end of the line.
A 530 kV, three phase transmission line with a 350 km length. The series impedance Z =(0.11+j0.72) Ω/ph/km and shunt admittance y = (j73 x e(-7)) S/ph/km. Evaluate the equivalent π-model and T-model parameters.
A 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 The resistance and inductive reactance of the line per phase are 10 W and 20 W respectively while capacitance admittance is 4 × 10- 4 siemen. Calculate : (i)the sending end current (ii) sending end voltage (line-to-line) (iii) sending end power factor (iv) transmission efficiency Use nominal T method.
A 50 Hz, 250 V single phase power line has the following loads placed across it in parallel; 4 kW ata pf of 0. 8 lagging; 6 kVA at a pf of 0.6 lagging; 5 kVA which includes 1.2 kVAR leading. Determinethe overall pf of the system and the capacitance of the capacitor which, if connected across themains restore the power factor to unity.
Find the characteristics of the load at the sending end and the efficiency of a three phase transmission line 160 km long delivering 15 MVA load at 110 kv, 50 Hz and 0.9 power factor (lagging) having inductance 1.356 mH/km per phase, capacitance 0.0085 uF/km per phase and resistance 40 ohms. Use nominal T-method Ans. Is = 70.3 20,8° Amp, Vsa.LD= 117.6 29.2 kV, power factor = 0.9898, n = 95.3%
A 3-phase Y-connected source (400V) supplies a 3-phase Y-connected load (3xZload = 27 + 9.0 ohm) via a non-ideal, three-core cable. No neutral line is available. Each conductor of the cable has an impedance Zcable = 80 + 2.1 mOhm a. Measure the phase shift angle between line voltage and phase voltage. b. Because of a fault, one of the three load impedances changes to half its original value. What happens to the phase voltages at the load.
A 110 kV, 50 Hz, three phase 300km delivers 20 MW of power at power factor of 0.8 lagging. The line has the following parameters: R' = 0.16 0/km, X'= 0.250/km. y'=j1.5 u mho/km, calculate: a) The sending end voltage and current b) Voltage regulation c) Transmission efficiency
2. Solve the following problem: A THREE-PHASE PLANT CONSUMES 600 KVA, WITH A VOLTAGE OF 2400 VOLTS AND A POWER FACTOR OF 0.8 BEHIND. a) DETERMINE THE EQUIVALENT DELTA IMPEDANCE OF THE PLANT. b) IF THE PLANT WERE A STAR, CALCULATE THE RESISTANCE, REACTANCE AND THE CORRESPONDING PASSIVE ELEMENT.
A short 230 kV transmission line with a reactance of 18 ph supplies a load at 0.85 pf. lag. For a line current of 1000 A, the receiving and sending end voltages are to be maintained at 230 kV. Calculate: (i) rating of synchronous capacitor required (ii) load current (iii) load MVA. Neglect power drawn by capacitor.

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