Interested to Buy Any Domain ? << Click Here >> for more details...
What is difference between dc three point starter and dc four point starter?
- 3 Answers
- 7920 Views
- Chettinad, I also Faced
- E-Mail Answers
Answer Posted / boo123pavani
In three point starter NVR (no voltage relay)is series with
Shunt if voltage falls certain value NVR De energized due to
insufficient magnetic field and motor turned off. But in
four point starter NVR energized directly from DC supply
thus the draw back of 3 point starter rectified
A motor can be run for a higher speed than normal speed by reducing the field current. reduced the field current may not produce enough magnetic force to hold the handle in on position. so handle returns to off position. this is the disadvantage of three point starter.this is the advantage of four point starter. it will not returns to off position
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
For R-L or R-C ckt,time constant formula is L/R and RC respectively and its unit is in sec.Pls tell me the derivation
IN 1000kva transformer where the oil and winding temperature sensors is connected
What is the meaning of floating point earthing in battery backed systems ?
how many synchronous motor are there in any power plant
What is different bewteen low or high impedance busbar protection scheme
What is precision of a measurement?
Actuality I have at home electrical panel with 220v 50hz, and I want to converter from there to 110v 60hz, to wiring on the half of my house. Also I like to keep another half of my house with the original 220v 50hz. What is the best and safety way to do?
How short circuit MVA(Fault MVA) in a power system calculated for calculating number of earth plates ?
What is the effect of interchanging core(made of steel) and winding(made of copper) material in case of transformer? Give proper explanation in regard to different losses in transformer.
What is polar plot?
What is pd controller?
how to differentiate a mpcb,mcb with a contactor? Explain their working operation
relation between power station capacity and voltage level?
sir, i am 3 years diploma course pass out candidate.what type of certificate can i got in marine service.
What is the operating principle of turbo-generator.
