Answer / karthick

in star connection
line voltage is=(3)^(1/2)*phasevoltage
line current is=phase current
in delta connection
line voltage is =phase voltage
line current is =(3)^(1/2)*phase current

power ratio=( ((3)^(1/2)*phasevoltage*phase current)/((((3)^
(1/2)*phasevoltage*phase current))
so power ratio is =1.

Answer / ganeshagraja samanta

the ratio of power in star & delta is 1:3

Answer / jothi mahalingam

power ratio b/w star and delta is 1/3.In star, total power
will be 1/3 times of delta total power.

Answer / karl

If placing 3 resistors in Delta rather than Star will end
up with 3 times more heating power. This is because you
have sq root of 3 times more voltage across each resistor
in Delta and hence end up with the sq root of 3 times more
current through each resistor. The sq root of 3 of more
voltage times the sq root of 3 of more current than, star
connected resistors means 3 times more power. Capacitor
are often connected in Delta for power factor correction as
this offers 3 times more reactive power than in Star
connection, though be aware they need to be able to cope
with line voltage across each Cap in Delta.

Answer / ganesh

Power ratio between star and delta is 1:1
because power in star=line voltage(3^1/2*Vph)*line current
(Iph)=3^1/2VphIph
power in delta =line voltage(Vph)*line current(3^1/2*Iph)
=3^1/2VphIph

Answer / alpesh surat

i think transformer just step up or step down voltage or
current only but power remains same(constant).so ratio of
p1 to p2 is 1 when same transformer connected in star or
delta.

Answer / reshi

The power transformation ratio in the transformer is
1:1.Only the voltage and currents are subjected to
change.Pri MVA=Secondary MVA. Except to compensate for some
losses.

Answer / pratik chhatbar

If placing 3 resistors in Delta rather than Star will end
up with 3 times more heating power. This is because you
have sq root of 3 times more voltage across each resistor
in Delta and hence end up with the sq root of 3 times more
current through each resistor. The sq root of 3 of more
voltage times the sq root of 3 of more current than, star
connected resistors means 3 times more power. Capacitor
are often connected in Delta for power factor correction as
this offers 3 times more reactive power than in Star
connection, though be aware they need to be able to cope
with line voltage across each Cap in Delta.
Thanks

Answer / sasi karthick a

The power is depends on the resistance of the winding. Lets
Take "R"ohm resistance of winding and connect in star
configuration.

then transform it to delta. You will see the result. It
will "R/3". So low resistance, high current, power.

Answer / priyadharsini

power = 3vicos

in delta Iphase = Iline/rt3.
Vphase = Vline

ie in delta connected ckt P= rt3VphaseIphasecos

IIly in star connected vphase=Vline/rt3,
Iline=Iphase
ie Power = rt3 vpahseIphaseCos
ie. in both star and delta power remain same
therefore the Power ratio = 1.

Why Motors are generally supplied with 3 core cables??? why not 4C??

5 Answers  

could any one explain me what power factor and where it is use ful

3 Answers  

why we use iron corn in transformer instead of wooden core

12 Answers  

how to calculate kvar in Akiva

0 Answers  

how to reduce the power consumption in office ?

6 Answers  

HOW DO YOU CAN CHECK A 15KV DIODE, WHETHER IT IS OK OR NOT?

0 Answers   TMB,

what is the formula to calculate the fault level current for any substation?

2 Answers  

how to calculate the powerfactor in induction motor having name plate details? for example 1 h.p motor 1.86 A 415 V

6 Answers  

How to find Cable size? Caterpillar generator produce (Two generators) 127*2=254 amp at 11 kv . What would be the cable size (XLPE) to supply 256 amp at 11 kv? Air or surrounding Temperature is 32 degree C. Cable will go under ground at 2.5 feet depth. Group Rating Factors is 3 cables. Clearance between cables is 7 cm. Soil Temperature (Ambient) 28o C Soil Thermal Resistivity is 1.2 K.m/W I would like to use 3 separate single core instead of using 3 core cable. Some says I should use three separate single core 120RM cables. Some says 70RM .some says 95. I m totally confused. Is there ant specific rule to determine cable size? What would be the LT cable size to flow 500 Amp current? Ifte My e mail address is ifte13@yahoo.com Anyone please send me the answer to my e mail address, i will be very glad.

1 Answers  

What is boucholz relay and the significance of it in to the trformer?

0 Answers  

a.c&d.c motor&generator

2 Answers   Vizag Steel,

Which lamp will fuse first(1)20(2)40(3)200 three lamps will fuse together

2 Answers   NTPC,