difference between a four point starter and three point
starter
Answers were Sorted based on User's Feedback
Answer / k.sathish kumar
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
Is This Answer Correct ? | 170 Yes | 27 No |
Answer / v.l.kanth
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 ? | 64 Yes | 19 No |
Answer / saikat sshoo
In 4point starter a brass arc is present which is not present In 3point starter. A protective resistance is present In 4point starter which is not In 3point starter.
Is This Answer Correct ? | 14 Yes | 5 No |
Answer / priyanka
As we know that dc machines are self starting ,we get high currents which leads to machine. So we use a three point starter to limit high currents and to control machine burn out's and sparkles.
Is This Answer Correct ? | 17 Yes | 9 No |
Answer / anil kumar behera
In 4point starter a brass arc is present which is not present In 3point starter. A protective resistance is present In 4point starter which is not In 3point starter.
Is This Answer Correct ? | 8 Yes | 8 No |
Answer / jasif farooq pala
Your Answerthe basic difference between in the circuit of 4 point stater as compared to 3 point stater is that, the holding coil is removed from shunt felid circuit and us directly connected across the line with a current limiting resistance R in series
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / sandeep
In case of any three pointstarter NVC is connected to the shunt field winding so if voltage is fall certain value the no volt release coil de magnetise so motor will be off. But in case of four point starter the no volt release coil is directly connected to the supply so the NVC no way the demagnetized.
Is This Answer Correct ? | 1 Yes | 4 No |
Answer / deep
Explin the fundamental equations usedin design of electro magnet.
Is This Answer Correct ? | 19 Yes | 34 No |
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