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 |
what are the protections in 132 kv class electrical systems.....? hw u define that in elctrical terms..? . . .pls answr
What is ferro-resonance in electrical system? Why it occurs and what are measures to prevent it?
if we convert ampers into kw,which one formula use by us,pls tell me?
th how could we differentiate between armoured copper and armoured aluminium cable what is the basic application? why we prefer the armoured copper as compared to armoured aluminium.
what is elevation lamp?where its used?
How to calculate capacitor bank size at a load 800kVA.
How to Calculate The Neutral Earth flat design calculation for the Synchronised generator (Gen 1-650Kva, Gen 2-725Kva
1. what is the power factor of a purely inductive load? 2. Which type of transformer connection is preferred in case of power supply transformers? 3. In power transformer usually which winding is closer to the core? 4. what will happen to the generated emf if the no. of poles of an alternator is increased?
considering the 3phase and single phase ac system the load applied and the volage given is same...will the current differs for both the cases are it wil remain same?
How can calculate the rating of a alternator for a given specific load with formula
0 Answers NRSC National Remote Sensing Centre,
why compound generator is used in generating station?
upto how many load can v connect to stabilizer which is used for tv