How does a star connection and delta connection work? How
does the star connection save starting current and how does
it change to delta?
Answers were Sorted based on User's Feedback
Answer / pillay
A typical 3 phase motor has 3 sets of windings. Each set of
windings have 2 terminals namely the start and the end of
the winding.During the start the end of of all 3 windings
is joined together through a contactor known as the star
contactor and the 3 phase power supply is applied across the
start terminals of the 3 windings.This windings are actually
designed for the application of 2 different phase voltages
across them.So during start up lower voltage is applied and
so a lower current is drawn. but after a few seconds the
connections are changed through the change over of
contactors to the full voltage across the windings known as
delta connections. This start and change over is done by
timer controlled contactors.
Is This Answer Correct ? | 6 Yes | 4 No |
Answer / hiren bhatt
in star connection line voltage of system is decreased to 1
by square root of 3 is equal to 1/1.73 of line voltage,
thats why in starting motor get reduced voltage asper this
ratio and hence star connection help to reduce effect of
dv/dt to the connected load and hence its insulation and
starting current protected
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / devi kumar
star resistance have more than delta resistance ex:star have 4 ohms delta 2 Ohms so I=V/R star current =230/4 57.5
Delta current = 230/2 = 115
Is This Answer Correct ? | 1 Yes | 0 No |
Sir, I completed DEEE... And now I working in TNEB for one year apprenticeship. If I eligible for applying c license and how can I get?
how the ac voltage are selected like 220v,415v,750v,1000v& 1.KV,6.6KV,11KV,33KV,66KV,132KV,220KV & why these are selected like these orders
what is the advantages og idmt relay over magnetic relay??
If you touch power transformer........ Then , in your body current will flow or not...?
what is the difference between thermal magnetic release and microprocessor based release breakers. what are the advantages of latter over the first one...
5 Answers Jackson, Karthik Industries, McD BERL, TCS,
where they are using surge arrester and lighting arrester? how they connect? what is the purpose of that?
How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.
why does connected a indutor with mnsformeretering core of current transformer ?
how to Select Lighting arrester? What r the parameters to be considered for the selection of Lighting arrester ?
Which state of India had first started power reforms?
Do you know how to measure the earth resistance? if so explain it
42 Answers ABB, BEL, BridgeStone, College School Exams Tests, Dalkia, Dalmia Group, DEC, Electrical, Genpact, HEC, IOCL, JLL, L&T, MSEB, Saraca, Sical, Telecommunications, University Exams,
what is a universal motor? how it works?