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Excuse me if I am being too heavy, actually I did not know a simpler way to explain it. If you do not know the maths behind how to find area under the graph by integration then it will be good to understand average power as (Max+Min)/2. I think for PE that is sufficient. But you should know the...

Mr. Ric Moore @CAPLSis from CA Board and is always very helpful to the issues of the forum users. A specie very rarely found nowadays. He helped me too. I really appreciate his help. 

Perfect. The instantaneous max demand is peak demand, different from max demand. Generally the supply companies will try to even/average out the KW supplied by putting a tariff based on Max demand averaged over 15/30 minutes period. The individual instantaneous peaks are rarely considered in...

This is general procedure Max demand is calculated. Generally it is 15 minute period in business, it can be something else say 30minutes- More is the time better it is for the consumer, lesser is the time better it is for the supply company. On the meter reading day, the Max demand reading is...

In this question the Max demand given at t=0 is 35KW. Understand it like this. Every 15 minute period meter will calculate average KW of this 15minute period and then compare it with earlier data it has preserved- reject the new data if it is less than earlier data or select the new data if it...

Your answer is the most right. From the KVA load given, it is clear that the load in inductive ( Both parts positive) and from your answer the phase current lags Voltage; matches perfect. You should not have doubt now. 

The magnitude of source Voltage never changes by how you connect the transformer to it. It may change across the windings of a transformer depending on its connection.Please show up the question to go ahead. 

Can u please show up the question

There may not be ready reference for these questions answering or explaining specifically. This comes under the subject of circuit theory of EE degree course and you have to make an understanding from there.  Let me try to explain if it makes sense. When a system is grounded you have a...

In this question the hint is they show a grid ( The straight line on the other side of the transformer). So this transformer feeds the fault. Generally radial feeder will be shown by an arrow going away from the transformer. That means Transformer is only feeding the loads.

I remember I posted answer to it somewhere in this thread but I did not find it . So I do it again. Your are right. Transformer is a passive device and does not have power of its own. You will get an indication in the question whether transformer will feed fault current or not. Say if the other...

For energy items like demand,  efficiency, Energy mgt- Wildi is good source. This generally is common business sense. For reliability I learnt it from work but surfing net also helps. There are few terms and few formulae along with concept of probability.

Hi Brip, I am sorry, I was a bit occupied. As clarified now, this is a question involving the concept of symmetrical components to resolve non symmetrical faults. I made a mistake in getting the question earlier. The formula I1Z1=I2Z2  should  be  used for distribution of load currents and not...

One more thing I would like to mention here. If anyone of you need any help to solve a problem, I am here to help. I would like you guys try first to understand among yourself and in case the student in you is not satisfied, just put me in loop and I will chip in the discussion. 

Guys,  I would like to tell you that derivation of formula for distribution of loads of two sources will be good idea to solve this problem. The starting point of this formula is distribution of loads (currents ) in two impedances in parallel. When two impedances are in parallel the voltage...

I have drawn a phasor diagram to explain VD for lagging load and Inductive line. For leading load inductive line or any combination of load and line you can draw yourself. 

Great you got it right!

Hint  I= 200<25 Can you get something from angle 25 degrees here. What if there is negative sign here?

The Theta is power factor of the load. It does not have anything to do with Z of Line feeder. So be careful. The formula is for inductive line and inductive load. Theta is positive for lagging load and negative for leading load. In the question given load is capacitive, (leading) so take theta...