Determine phase - voltage and power, Electrical Engineering

Determine phase - voltage and power:

A balanced star connected load is supplied from a symmetrical 3-phase 440 Volt system. The current in each of the phase is 40 Amp and lags 30o behind the phase voltage. Determine

1.      phase voltage,

2.      power,

3.      reactive power drawn by a the load, and

4.      phase impedance.


For three phase star connected load voltage applied VL = 440 Volt

(a)                  V ph    = 440/ √3 = 254.03 Volt

Power current = I ph = 40 ∠ - 30o Amp = I L

 (b)       Power P =3 VL I L cos φ   = 3 × 440 × 40 cos 30o

                                                            = 26400 Watt = 26.4 kW

(c)        Reactive power drawn by the load:

Q= √3 VL I L sin φ

= √3 × 440 × 40 sin 30o

= 15242.047 Var = 15.24 kVAr

 (e)       Phase impedance Z ph = V ph I ph

               =254.03 ∠ 0o / 40 ∠- 30o = 6.35 ∠ 30o Ω

Posted Date: 2/5/2013 2:14:02 AM | Location : United States

Related Discussions:- Determine phase - voltage and power, Assignment Help, Ask Question on Determine phase - voltage and power, Get Answer, Expert's Help, Determine phase - voltage and power Discussions

Write discussion on Determine phase - voltage and power
Your posts are moderated
Related Questions
Q. Show the Methods of material handling? Methods of material handling during operations and maintenance activities shall be considered for all facilities to ensure that the fi

Continuity Equations These equations are fundamentally particle conservation equations: Electron continuity equation:  ∂n /∂t = (1/q) (∂j N / ∂X) + G N - R N Hole c

Relays a) Sketch the schematic symbol for a relay with a single pole changeover switch b) Determine the coil resistance and determine the current at 12Vdc c) Connect the r

a) Write a program that will read and show the analog voltage on pin PE7 approximately once every second. b) Write a program that will read and show in decivolts the analog volt

Design a Mealy system whose output is 1 iff there have been exactly two 1's followed by a 0 and then a 1. (a) Assume overlapping is allowed (b) Assume overlapping is not

Briefly explain single mode and multimode fibres The optical fibres were categorized within two according to the number of modes it passes as: • Single mode fibres • Multi mode

Classify the following signals as energy signals or power signals. Find the normalized energy or normalized power of each. a. ? ? , 0, 0 0, at Ae t a x t elsewhere

Exercise 1: Data array manipulation and selection using for loops These exercises demonstrate the use of for loops in array manipulation and selection. a) Write a user-defined fun

what is event triggering related to digital storage oscilloscope?

Explain explanatory notes on comparison of RS232C and RS422A standards. Comparison of RS232C and RS422A standards: RS232C 1. Standard explained for asynchronous commu