In power generator sets, when they are coverted from 50hz
to 60hz, the kva rating after conversion increases. For
example, the manufacturer of a perkins 200kva @ 50Hz
generator set has mentioned it to become 220kva after
converstion to 60hz. What is the relation between the
frequency & the KVA rating. Any formula please.
An input device is interfaced with Intel 8085A
microprocessor as memory mapped I/O.The address of the
device is 2500H.In order to input data from the device to
accumulator,the sequence of instruction will be
If any HVDC line is going with positive & negative(the
negative usually have return path of current with earthing
Now the question is if this HVDC earthed electrode which is
using as return path and earthed any nearby 400kv or 220kv
AC substation equipments.
which will be the impact of this on AC substation & its
equipment, how severe may be this and what should be the
minimum distance require between HVDC earthed electrode and
AC substation equipments?
It's really an high engineering level question...Dare to
answer and increase your knowledge.
I need the recommended size for a 3 phase transformer at
13.8 KV Primary and connected loads of 3000 kVA at 4200
volts and 2375 kVA @ 480 volts AC.
A motor running with lenze frequiency inverter stops if I
REDUCE SPEED with 25% load.If I run it in High speed and
medium speed running smoothly with full load.please help me
to solve it.
when we design electrical schemes of 11/.415kv
distribution..wen and were should we show the relays??what
is the function of it?for example..we place EFR Relay CT
between transformer neutral link and transformer earth.Like
this what are the other type of relays we should
use?why?where?Explain please..Thank you
how to calculate the step resistance for slipring induction
motor,how you deside the no of step for that?
please send privious years question papers of jindal steel
and power ltd.My e mail id is email@example.com
What is meant by Low Resistance Cable and High Resistance
what is the use of vcb & isolator in substation?
What is the form name of 'c' license, I want to download in web
Difference between transition and diffusion capacitance
What is the automatic voltage regulator with servomotor?
explain wiring system
what is the meaning of vcc
Transmission through a short line depends on
I have a drawing of a wound rotor induction motor for a
crane. This crane motor has 5 forward speeds & 5 reverse
speed implemented of course with different amount of
resistance for each speed setting selected. What has got me
scratching around is the fact that 8 of the 10 speed
selections switch in uneven (unbalanced) amounts of
resistances on each of the 3 connections to the motor's
rotor.Can this be possible? I would have assumed this would
produce unbalanced rotor currents and therefore vibration
in the motor. I would greatly appreciate anyone's comments