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 30^o behind the phase voltage. Determine

1.      phase voltage,

2.      power,

3.      reactive power drawn by a the load, and

4.      phase impedance.

Solution

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

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

Power current = I ph = 40 ∠ - 30^o Amp = I _L

 (b)       Power P_3φ =3 V_L I _L cos φ   = 3 × 440 × 40 cos 30^o

                                                            = 26400 Watt = 26.4 kW

(c)        Reactive power drawn by the load:

Q_3φ = √3 VL I L sin φ

= √3 × 440 × 40 sin 30^o

= 15242.047 V_ar = 15.24 kVA_r

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

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

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

Ask an Expert

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

Write your message here..

Related Questions

Nop no operation instruction , NOP No Operation Instruction No operati... NOP No Operation Instruction No operation  is performed  when this  instruction is executed. The instruction format is             NOP All  registers and flags  re

Explain read-only memory, Q. Explain Read-only memory? ROM is nonvolati... Q. Explain Read-only memory? ROM is nonvolatile (because it maintains its contents even when its power is shut off) and is used to store data and programs that do not change du

Develop a two-dimensional addressing system, Q. Suppose a ROM holds a total... Q. Suppose a ROM holds a total of 8192 bits. (a) How many bits long would the individual addresses have to be? (b) If the bits are organized into 8-bit memory words or bytes,

What are the precautions to be taken, What are the precautions to be taken ... What are the precautions to be taken before basic work on electrical installations? Ans: Before starting any electrical works on installations disconnect the power supply to

Terms with respect to d.c machine, Q.  Define coil pitch, Back pitch, fron... Q.  Define coil pitch, Back pitch, front pitch, pole pitch, commutator pitch, resultant pitch, Multiplex winding and degree of Re-entrant of a winding, with respect to a D.C. mach

Mixed mode simulator, Mixed Mode Simulator: The circuit is preproc... Mixed Mode Simulator: The circuit is preprocessed. The test points and waveform markers are located in input and output of the circuit. GND net is set like reference net.

Digital electronics, Design a 4-bit synchronous counter that has the follow... Design a 4-bit synchronous counter that has the following sequence: 0 ?4? 9?12 ? 14 ?15 and repeat using: i) JK FF ii)D FF

What is a resistor?, what is a resistor? what is a resistor?

Compute the attenuation, Q. A rectangular air-?lled RG-52/U is made of bras... Q. A rectangular air-?lled RG-52/U is made of brass (ρ = 3.9 × 10-8 m) and has dimensions a = 22.86 mm and b = 10.16 mm. (a) Determine ¯ Z0(= R0) at the limits of the practica

Explain working of inverting amplifier, Q. Explain working of Inverting Amp... Q. Explain working of Inverting Amplifier? One common op-amp circuit is shown in Figure. For the case of finite voltage gain Ao of an op amp that is otherwise ideal, the output