Answer / infodoss

STAR Connection:
i)Supply voltage is VL/root3 but supply current
IL(line)=Iph(phase).
DELTA connection:
i)supply voltage is VL=Vph but supply current
is differ.
Both supply used in speed control of induction motor.
Transmission point of viwe delta is better.
Application point of viwe star is better.

Answer / mvr murthy

In continuation to Answer 1, both are having their own
importance depending up on usage. How ever where neutral is
required star system will be adopted.

Answer / ramesh

Star Connection:
1. It is a setup where in one end of each phase is
connected together so as to form a neutral.
2. It is used for variable loadings
3. The line current = Phase current
4. The Line voltage = sqrt(3)* Phase volatge.
DELTA CONNECTION:
1. It is a setup where in one end of one phase is joined to
starting end of another end so a ring is completed.
2. It is used for balanced loads.
3. There is no neutral in here
4. Line current = sqrt(3)*phase current
5. Line voltage = phase voltage.
line volt- voltage taken from two live wire= voltage taken
from one live neural connection

Answer / zahid khan

star is only used intial to because the supply voltage is
VL/root3 and due to high starting torque of induction
motor,'star delta circut used above 20kw.

Answer / kb shrinivas

IN STAR CONNECTION THE LINE CURRENT EQUAL TO THE PHASE
CURRENT AND LINE VOLTAGE GREATER THAN PHASE VOLTAGE ,
VPH=VL/ROOT3 AND IN DELTA CONNECTION THE LINE CURRENT
GREATER THAN PHASE CURRENT , IL=IPH X ROOT3 AND LINE
VOLTAGE IS EQUAL TO PHASE VOLTAGE AND FINALLY BOTH
CONNECTIONS ARE VERY USEFUL IN THE 3 PHASE SYSTEM.

Answer / s k singh

For transmission, delta connection is suitable while for
distribution system, star connection is sutable because
nuetral is available in star connection.

Answer / rajkumar voorugonda

star connection is used when we need nuetral ,
d connection can be used to decrease the circulating
current in the system

Answer / nardos negash

4 transmition and 4 the motor at rated speed delta is
better b/c the current in delta is small/line at its
voltage than in Y so it saves the winding and the
insulation from over heating.

Answer / rahul

In star connection neutarl is already provided, so when we need neutral, we shold use star connection.

delta connection is used to reduce the effect of circulating current in the circuit.

Answer / glen

delta is prefered becoz it torque and power is greater as
compared to star connection
star is only used initial to becoz of the Supply voltage is
VL/root3 thus preventing drop in the line

how to find number of run cable laying[LT side] for transformer & alternator secondary side? [above condition for getting output power transformer to main panel side] give the example.

0 Answers   L&T,

give information about REM5453 & SPAJ Relays

1 Answers  

WHY R USE IN BRUSH IN THE MOTOR?

6 Answers   L&T,

Plugging is a phenomenon to= A braking the motor B to accelerate the motor C to run IM as generator D to start the motor

0 Answers  

any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?

0 Answers  

what is the meaning of 1250 KVA Trasformer

2 Answers  

why does make gain margin and phase margin on same plot.?

0 Answers  

What is the difference between Rectifier & Converter?

12 Answers   Bajaj,

in elevator industries , how to calculate the required KVA for the elevator (elevator spec- 40A module , motor of 13.5KW, 20A)

1 Answers   DLF, Tata Steel Limited,

why do we need the body earth?

4 Answers  

WHAT ARE THE FACTORS REQUIRED FOR SELECTION OF TRANSFORMER RATING?

13 Answers   Tech Mahindra, Technip,

what happens when back feeding supply accidently collapses with normal supply ??? How?? [that is sometimes in a substation 11kv feeder if their ws long time permit work, back feeding supply will provide from nearest substation... if accidently after the permit work,they charged the feeder without removing back feeding wat will happen...?]

1 Answers   KSEB,