Interested to Buy Any Domain ? << Click Here >> for more details...
why we use star and delta connection?why we donot give the
supply directly?
- 12 Answers
- 59268 Views
- Hitech, Siemens, Tata Steel Limited, I also Faced
- E-Mail Answers
Answer Posted / abhishek goyal
We use star delta for mostly above the 10hp motors (we use
dol starter). When we connect dol starter to above 10hp
motor it will be trip because it take high current during
starting time approx 6-7 times of rated current. If we using
star delta starter it will work because in star Iph=IL and
Vl=Vph/1.732 so that in starting time it take less voltage
then delta and it torque also less and speed also less as
per electrical or practical application at that time torque
is 1/route3rd or 1/1.732 time so that current also less by
1/route3rd or 1/1.732 times. After getting speed it will
connecting into the delta position.
If directly connected with supply it will burn out or damage
of some other electrical equipment because of high
current.insulation of motor also damage or burn.
| Is This Answer Correct ? | 34 Yes | 5 No |
Post New Answer View All Answers
Determine a suitable number of slors and conductors per slot for the starter 1 winding of a 3 phase, 3300 V. SO Hz 300 rpm alternator. The diameter is 2.3 m
how dose servo motor works
What are the conditions for sustained oscillator or what is backhouse criterion?
what is the difference between neutral and earth
i had aplied Hindustan Petroleum corporation limited for the post of maintenance technician -Electrical,i want model questions,if anybody have please send it or please advice?
I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. Between alternator & breaker one stepup transformer used. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.
why the colour of insultor stack , petticoat is brown. Is it has some technical reason.
Dear sir, iam completed iti ncvt electrician 2000-2002 & diploma electrical eng completed 2008-2010 distance education in rvd university, still i got B licences only but my working company want C licences, how to i get c licencese pls reply me iam in critical situation thank you karthick 9841637803
Write down the name of 2 lady Bir Pratin of Bangladesh
pls someone send me sample question papers along with the key.thanks in advance
Explain the operation carried out in thermal power stations?
What are the criteria shall be considers for sizing Fuse and MCB? If the rated current is 10Amps what should be the fuse size / MCB Size?
What are the causes of having an rmu explode after installation? And how do u treat the bushings of an rmu?
PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM
We have 110Vac ,10A ac supply which is converted into 110VDC & How much DC current? which factor is reqired for dc current calulation?
