My title page contents

Capicitor Application Issues

Capacitors must be built to tolerate voltages and currents in excess of their ratings according to standards. The applicable standard for power capacitors is IEEE Std 18-2002, IEEE Standard for Shunt Power Capacitors.

Heat as one of most common cause of motor failure

This slide speaks about that how motor operation fails due to heat. how heat affect motors?

Sunday, 18 May 2014

Home Made Power Plant

There is one disturbing fact that people are slowly beginning to realize. We can't depend on fossil fuels for our energy forever.
Oil prices are skyrocketing around the world. People are fighting and dying over oil reserves. The damage to our planet and our climate is irreversible and is becoming more and more apparent by the day. Put shortly, chances are that if we don't do something about our energy situation now, our kids and their kids are going to have to face some extremely difficult challenges in the future.
But what can we do? It seems that most alternative energy choices are too expensive to mass market. As an individual, is there really anything you can do to make a difference?

We're going to answer those questions and a whole lot more throughout this book. We'll look at some of things you can start doing right now, today, to do your part in solving the world's energy crisis.




Saturday, 17 May 2014

Electrical Engineering MCQs





Friday, 16 May 2014

Understanding Electric Power Systems




Electrical Engineering MCQs




Thursday, 15 May 2014

How do the synchronizing lamps indicate the correctness of phase sequence between existing and incoming Alternators?

The correctness of the phase sequence can be checked by looking at the three sets of lamps connected across the 3-pole of the synchronizing switch. If the lamps grow bright and dark in unison it is an indication of the correctness of the phase sequence. If on the other hand, they become bright and dark one after the other, connections to any two machine terminals have to be interchanged after shutting down the machine.

State the condition to be satisfied before connecting two alternators in parallel

The following are the three conditions to be satisfied by synchronizing the additional Alternator with the existing one or the common bus-bars.

  • The terminal voltage magnitude of the incoming Alternator must be made equal to the existing Alternator or the bus-bar voltage magnitude. 
  • The phase sequence of the incoming Alternator voltage
  • The phase sequence of the incoming Alternator voltage must be similar to the bus-bar voltage. 
  • The frequency of the incoming Alternator voltage must be the same as the bus-bar voltage. 

What are the causes of changes in voltage in Alternators when loaded?

Variations in terminal voltage in Alternators on load condition are due to the following three causes:


  • Voltage variation due to the resistance of the winding, R
  • Voltage variation due to the leakage reactance of the winding, Xt
  • Voltage variation due to the armature reaction effect, Xa