What is difference between dc three point starter and dc four point starter?
Answers were Sorted based on User's Feedback
Answer / 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 |
Answer / pritish
the difference between a 3 point and 4 point starter is, 4 point starter can be used for over load protection where as 3 point starter can not be used for over load protection and other difference is 4 point starter has 4 terminals and 3 point as three terminals.
Is This Answer Correct ? | 2 Yes | 3 No |
What are the classification of Servo Motor?
What is harmonics in AC waves. How it is generated? How it will effect the system network? how can eliminate it?
what is the purpose of using battery in dg sets, please specify in details.
what is 'A' Check & 'B' Check ?
what is difference between neutral and earth
What is online and offline ups? how does it works?
We are planning to synchronized DG's with our captive plant in the event of black start of plant, but before sync we checked voltage of DG with our plant voltage and it varies from 5 V to 450 V. So in this condition how we can sync DG with plant ?
In Panels Main Incomer considered should be TPN or FP?
60 watts bulb and resistor home heater is connected in series and 230v is given to the circuit. The heater is giving some amount of heat. If instant of 60 watts bulb replace 100 watts bulb what will be the output of the heater?
Why charcoal and salt add in earthing pit.
6 Answers Garware, NTPC, Sterling Wilson,
Grounding. Dear all at one of my site we checked the amps at the earthing cable to the alternator it was found 125 to 130 A. at the neutal cable in same machine found 146A. in the same plant checked the earthing current on other alternator it was 52A, and neutral 116 A. we are facing problems with our controller and the card was damaged once. can that neutral/GND current be a reason? as there is common grounding for the Alternator,Brkr panel,Transformer?
Which is remain unchanged in transformer action?