Answer / Narendar Kumar

To protect a motor in a DOL (Direct On Line) starter with capacities ranging from 30 HP to 40 HP, you can implement the following measures:
1. Use a proper overload relay to prevent excessive current.n
2. Install a thermal protector to guard against overheating.n
3. Implement a motor soft-start function to minimize shock loads during startup and reduce wear on the motor.n
4. Ensure regular maintenance of the starter, motor, and wiring connections.

Why cannot we insulate HT over head cable to avoid ionization of air around the HT Cable?..By this we can minimise corona loss also..

1 Answers  

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Please let me if star point(Nutral) of Delta/ Strar transformer, in 4wire (TPN+E) is tobe gruonded seperatly,inaddition to LV Panel earthing????

1 Answers  

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why scott connection is done why not two phases are directly picked at the output of 3 phase transformer??

1 Answers  

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I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

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WHY WE USE 4-20mA

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WHAT IS THE FULL FORM OF CABLE TYPE-AYWY,AYWAY,YWY ?

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At a family reunion were the following people: one grandfather, one grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one father-in-law, one mother-in-law, and one daughter-in-law. But not as many people attended as it sounds. How many were there ?

6 Answers   CTS,

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could mail me the question papers for the test.

1 Answers   ONGC,

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need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

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how is the incoming cable size calculated for a given current rating of a panel??

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What happens with squirrel induction machines if the ends of rotor conductors are kept open? Explain

3 Answers  

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what are the affects of loose connection in electrical circuit.

14 Answers   HP,

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