Answer / prakash gokhale

Power Factor is a cosine angle between voltage and current

Answer / mohammad farman khan

Power factor is ratio of KW/KVA.

POWER FACTOR IS LAWYAS LAGGING

Answer / sureshkumar.n-npr

This is normally PF mans cosine angle between used power.

Answer / pradhyumn

Power factor is a measure of degree to which a given load
matches that of a pure resistance.

Power factor is a ratio of actual power(VIcosΦ) to apparent
power(VI), so it is given by cosΦ.

PF=1 (for resistive load).
PF=0 (for both inductive and capacitive load).

PF leads with capacitive load and lags with inductive load.

Answer / zeeshan yousaf

p.f practacally mean how much the power used in circuit....suppose p.f is 0.70 its mean in 100% power only 70%used to circuit and there 30% losses in that circuit....

Answer / lince v d

power is the measure, how we effectively use the electricity...

How to calculate voltage drop in copper and aluminium cable? I have laid 240Sq.mm Aluminium cable for the length of 600 Mtrs in 1 Mtrs underground. Normal load is 150A. Transformer is 630KVA, 6.KV/433V. But, I am getting only 395 Volts when load. How to calculate voltage drop and what is the permissible voltge drop for this circuit?

1 Answers  

i want to model paper for section engg.

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For testing 33kv cable hipot testing. How much kv we have to Apply .Give in details.

24 Answers  

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

1 Answers  

how we can calculate earth fault current?

1 Answers   Alchemist,

Dir sir we have 750 kva Caterpillar dg set we are fas on different problem we start dg set ofter 1 mint apply load around 500a dg was run one or 3 mint after 3 mints dg was shutdown automatic how to face tis problem

3 Answers  

What is the acceptable earth resistance for Commissioning the Transformer?

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the total iron closs in a transformer core at normal flux density was measured at 25hz and 5ohz and was found to be 250w and 800w respectively.the hysteresis loss at 50hz would be................?????

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How to increase solar cell efficiency ?

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How Arc Produced in Circuit Breaker When the contacts of the circuit breaker open.

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I have a 3 phase 600 volt prim. feed and a 120/208 sec. Isolateing tranformer .We are using this system for safety against shock . What is the proper grounding ?? Does the common on sec. get earth ground ???

1 Answers  

Parts of machine and their discription in details with suitable photo

1 Answers