Air control

Percentage Transformer Impedence is the Voltage drop on the 
full load due to the winding resistance and leakage 
reactance express as a percentage of rated voltage.

percentage Impedence = Impedence voltage/Rated voltage
*100

Transformer percentage impedence is the percentage of 
primary voltage rating of the transformer required to drive 
secondary rated current when secondary is shorted.

in dc shunt motor if field will open field current will be 
zero and motor stops rotating...

the flux becomes very less dat is only residual 
magnetism.as speedinversly proportional to flux d speed 
will become very high.

The speed of the shuntmotor becomes high(uncontrollable) 
and the windings are burn

motor function will be stopped and its armature rotation 
comedown slowly

the motor comes to rest when we open the field winding of a 
dc motor

motor stops

When field ckt is opened field current will be zero,flux 
will be zero,as speed is inversly proportional to speed
becoz of zero flux motor tries to rotate at maximum
(infinite),dangerous speed .motor will be damaged(un rooted 
etc..)

motor will be stoped

when fied is open then field current will be zero and so 
field flux also tends to zero,as speed is inversaly 
proportional to flux, motor will rotate at (infinite)high 
speed then winding will burn

if as always protection is use or drive used for motor then 
it will trip and stops motor and protect it from burning

Only one at the star point of generator which should be 
solidly grounded

Two eathing are req. minimum. Since the star point is 
earthing solidly, and obviously the generator frame/housing 
also to be provided with earthing to prevent any shock due 
to insulation failiure.

if the generator is connected with a fuel tank, (for higher 
size), it is necessary that, fuel tank to be grounted to 
prevent lightning surges and any static voltage generations.

2nos for body and 2 nos for neutral earthing.Is there any 
corrections ?

there should be two earthing required.one for star point 
and another for body. At the star point there should be a 
solid grounding,on the other hand body frame should be 
earth diagonally and the material for grounding depend on 
the rated valtage of generator

I DO NOT KNOW ABOUT 6.6KV MOTORS & ALSO ABOUT K FACTOR.BUT 
ACCORDING TO UR QUESTION IT LOOKS THAT MOTOR DRAW MORE 
INSTANTANOUS CURRENT THAN ASSUMED BY THE CALCULATION & AT 
THIS STARTING CURRENT OLR TRIPPED,WHEN U INCREASE THE 
SETTING OF OLR.IT DO NOT TRIP.
FOR THE PROTECTION POINT OF VIEW ONE EXTRA CONTACTOR MAY BE 
PROVIDE IN PARALLEL TO THE OPERATING CONACTOR WITH TIMER 
WHICH WILL MADE OFF THE CONATCTOR(PROVIDED NEWLY)&ALSO THIS 
CONTANCTOR WILL DRAW POWER FROM MAIN BUSBAR WITH EXTRA OLR .

You have increased thermal overload settings to .97 I think 
because of load motor gets hot early and after incresing 
the themal rating it will sustain.

FIRST OF ALL THIS MOTOR MUST HAVE A SOFT STARTER BECAUSE 
STARTING THIS MOTOR WILL DRAW A HUGE AMOUNT OF INRUSH 
CURRENT + HUGE AMOUNT OF STARTING CURRENT, SO YOU HAVE TO 
USE SOFT STARTER , AND YOU HAVE TO USE SMART RELAY BECAUSE 
STARTING AND INRUSH CURRENT CONATINS A HUGE AMOUNT OF 
HARMONIC CONTENTS SPECIALLY THIRD HARMONIC SO THIS SMART 
RELAY WILL DETECT THE VALUE OF THE THIRD HARMONIC COMPONENT 
AND IF IT EXCEEDS ITS VALUE IT WILL TRIP

v=ir
v=voltage
i=current
r=resistance
by ohm's law

v=ir
v=voltage
i=current
r=resistance

v=ir,when voltage increase current also increase.

voltage is difference between two potentials..........
current is flow of electrons in it...........
so with increase in current voltage increases.............

when I-current going through the conductor,proportional to 
the V-voltage

Voltage = current * resistance

power = voltage * Current

you want the relation between current and voltage. very 
fine. but in what element you want. it is different in 
different elements and devices. first you should be very 
clear before asking questions. ok. god bless you.

.8

it is the ratio of KVA to KW. In other words, it is the
cosine of the angle between voltage and current in an A.C
electrical circuit.

Power factor= KW/KVA

ELCB because it trips on any laekage of current within 30 
milli amps.This helps in preventing shock and electrocution 
owing to failure in insulation or short circuit.

Both ELCB & RCCB were Same

Electrical transducer is to convert electrical energy to 
mechanical..by this u can know the answer

In order to understand various types of pressure the 
following will be considered: Pressure Scale reference 
points, there are two reference points, the zero point of 
pressure which is assumed to a perfect vacuum, another 
point is atmospheric pressure which varies with altitude 
above sea level and with weather conditions. 
Absolute pressure scale starts from a zero reference point 
representing the full vacuum and extends through 
atmospheric pressure to the highest limit of measurable 
pressure. 
Gauge pressure scale starts zero reference point 
representing the local atmospheric pressure and extends to 
a chosen limit applicable to the specific process system. 
Vacuum scale starts from the absolute zero reference point 
and extends to a maximum represented by atmospheric 
pressure. 
The above can be expressed as following:
Zero of absolute pressure = perfect vacuum
Absolute Pressure = Pressure above Absolute zero 
Gauge Pressure = Absolute Pressure – Atmospheric pressure
Vacuum gauge Pressure = Atmospheric Pressure – Fluid 
Pressure

Atmospheric pressure is the pressure surrounding us which 
is 1.013bar.
Generally pressure gauges or transmitters show Atmospheric 
pressure+Absolute pressure, which is called as Gauge 
pressure

So, Absolute pressure = Gauge pressure - Atmospheric 
pressure

4 Nos.2 for Neutral and 2 for Body.Providing 1 pit each for 
neutral as well as body will also do but if you are running 
the DG continuosly , it will be difficult for you to 
measure pit resistance which is a activity to be done once 
in 2 years as per IE Rule 1956.