Interested to Buy Any Domain ? << Click Here >> for more details...
What is the d/f between DOL & star delta starter & automatic
star delta starter?
- 23 Answers
- 165331 Views
- ACC, Dalkia, Engineering, Indeco, NINL, Novotel, RMH Control Systems, Wipro, I also Faced
- E-Mail Answers
Answer Posted / romil verma
When the motor is connected in Delta and started by DOL method, the voltage applied across a coil is the voltage between two phases i.e, 415V approx. Therefore the current inrush is high. In order to minimize the starting current, voltage across the coils should be brought low, which can be done if we connect the coils in star. During star connection the voltage across a coil is 240V (approx) which is 1/(sq root of 3)times that in delta which results in a simultaneous lowering of current also. This eases the stress on relays and conductors.When the motor attains 90% of its rated speed the coils are connected in Delta. therefore generating higher power.
| Is This Answer Correct ? | 5 Yes | 3 No |
Post New Answer View All Answers
can any one know is sbi interview based on merit or based on roll number
How is the percentage impedence of a transformer fixed at design stage???
give me a clear defination of inductance,and how can u calculate inductance of a motor
Why does an induction generator is preffered as compared to synchronous generator in especially a wind energy power production project?
which is the most advanced form of SF6 BREAKER?Can we use other gases to quench the arc?
how to Select Lighting arrester? What r the parameters to be considered for the selection of Lighting arrester ?
What is the most essential condition for the voltage build up for a d.c. Shunt generator?
How many points does a Circuit can have?
What does the letter CTNM in negative phase sequence relay means?
bitumar
How to calculate VA rating for CT or PT or Control Transformer?
How many double suspension hardware fittings are required on a double circuit transmission tower?
Define Electrical Insulation and examples of Solid,Liquid and Gaseous insulating materials?
i need to now what will be the cable size to the following load, transformer to distribution panel distance 110m, load 1000kw, voltage 400v, pf 0.85, permissible voltage drop 2.0%, overhead line, atmospheric temperature 35 degree c.
How to decide cable tray size?
