Answer / nallakumar

The starting time motor taken high starting current that
star connection is must need after normal running condition
changed to delta connection.

Answer / bijay kuma bhoi

in star connection current is always same in starting and
running period ,so we can use fixed class of insulation
cable,but in case of delta this is not possible due to
changes of current .so all ht motors are conncted in star .

Answer / ankit

In star connection line voltage is root 3 times then that
of phase voltage while in delta line current is root 3
times then that of phase current.

so if we use delta then current will be less than line
current but voltage will be 6.6kv this will led to high
insulation.

if we use star connection then voltage measured will be
line voltage divided by root 3 thus insulation required is
less.

Answer / gajanan

we do not have any xmer having ratio 11/6.6 kv. so for
motor of 6.6 kv in star conneced we can use 11 kv supply.
bcoz in star vline=root 3 of v hase

Answer / ashish

because neutral point is available in star
connection,whereas no neutral point in delta...

1.what is surge used in power system 2.what is switching used in power system 3.what is lightning used in power system

1 Answers   Areva,

how hazordious area is classified at an oil & gas plant and categorise suitable class of electric equipment in that area like induction motors, LCS, Lighting Fixtures Fluerescent/Flood lights Mercury& sodium lights, J.Bs, Power Cables etc

2 Answers  

how does directional relay work incase of ac ?

0 Answers  

why we choose 50 or 60 hertz not other value for the power system?

4 Answers  

for selection of transformer we will considering 5 to 6 times of starting current of higher rating motor connected to secondary side. according to process wise we will start the motors gradually suppose if we will start 15 to 20 motors at a time wat will happen?

1 Answers  

the power consumption of perminant magnet moving coil?

1 Answers  

what type of earthing is done on hilly rocks.

4 Answers  

wath is this mining of bts

1 Answers   Nokia, TATA,

What are the types of excitation system?

0 Answers  

you have an automatic voltage regulator at home for your appliances,if the voltage in your area drops from 220v to 190v,does the output of the automatic voltage regulator drops?or does it retains the 220v output?

4 Answers  

can i connect the two phases of scott connected transformer,if not why?

0 Answers  

What current can be carried by 25 sqmm copper cable safely?

6 Answers   Bharti,