Answer Posted / shyam prakash ray
The principal is to keep the starting current in safe limit
so that the motor achieves 70% of speed as connected to
star side, since the motor draws very high current at the
time of starting due to high starting torque.
Once the motor gets started then it is changed/converted
into delta side either manually or automatically for
running.
| Is This Answer Correct ? | 32 Yes | 7 No |
Post New Answer View All Answers
-What shall be short circuit current of LV switchgear for a 1000 kva, 11.415kv, 3 phase tranformer with 5% reactance.
WHY THE DIMENSION OF TWO SAME RATED MACHINE IS DIFFERENT ?
what is the function of Moulded case circuit breaker, why it is called Moulded?
hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com
If VFD is On but no starting commond on it. so how many outpout voltages of VFD
what is the difference between electrical choke and electronic choke?
If any one's require of phoenix contact like( relay , termilnal block , surge protection device ) , product please contect me 09878206357 chetan verma
How seriving & testing of the HT & LT breakers are done. What are the standard Ir values on which we can come to know the test is passed or failed?
what is The difference between national electrical code and I.S.Code (electrical) and what is the value of NEC in electrical engineering field
what is the working principle of energy saver control panel. please give the complete calculation & theory.
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?
For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?
8. A DYNAMOMETER TYPE WATTMETER RESPONDS TO THE.......
How good are you in resolving the commercial issues to Employer's advantage?
What is systematic error?