hi,

I am an undergraduate student of engineering technology. I need help

to solve the following

2 questions for an electrical engineering assignment. I am studying

through correspondence

while holding a full time job and don't have access to a library. The

prescribed text does not

help much. I did some research on the Internet and was able to solve

two other questions relating

to power factor correction but not these.

Can somebody help me to answer these questions?

Q1.

Show with a the aid of a phasor diagram that for both star and delta

connected loads

the active power is (root 3 VI Cos phi) where V and I are line

quantities.

Q2.

A 200 KVA transformer has 800 turns on the primary and 160 turns on

the secondary.

the primary and secondary resistances are 0.3 ohms and 0.02 ohms, the

corresponding

leakage reactance are 1.1 ohm and 0.07 ohm respectively. If supply

voltage is 2200V,

calculate equivalent impedence referred to secondary and voltage

regulation at

3/4 full load having a p.f of i) 0.85 lag and ii) 0.6 lead

Also,

Are there other resources on the net to help people like me studying

on their own?

(in general, not limited to electrical engineering alone)

I will be very grateful to all who can help.

Thanks in advance,

Regards,

Sadsack William

- posted
17 years ago