Answer / rabi

Ac-1 contactor is used for "Non-inductive or slightly
inductive loads, resistance furnaces".

Ac-3-contactor is used "Squirrel-cage motors: starting,
switching off motors during run-ning."

i am iti student i have project to do. that IS 100MW 220\33KV SUBSTATION I WANT TO KNOW HOW TO START, LIKE CALCULATION, WHAT RATING OF CT,CVT, PT, ISOLATOR LIGHTING ARRESTER WAVE TRAP CIRCUIT BREAKER IN 22OKV SIDE, ALSO TO WARDS 33KV SIDE PLS HELP ME WITH THIS, THIS MY LIFE NOW, I KNOW AUTOCAD, I LIKE TO KNOW HOW TO CALCULATE ALL THE THINGS

3 Answers  

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1) Why distributiion system decided 11 kv, 33 kv, 66 kv, 132 kv, 220 kv, 400 kv, 2) In 3 Phase line terminal of capacitor, why used for power factor improvement. 3) Why used rating KVA in transformer?

1 Answers  

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what are the standard values for resistances(Megger testing) between L&N, L&E and N&E (L=Live,N=Neutral, E=Earth)?

1 Answers  

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What Should be the value of Vector Surge angle at Tripping and how to calculate it?

1 Answers  

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While connecting bulb in Series/Parallel,there is any difference in glowing

3 Answers  

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What is Co-generation in the context of electrical power systems?

1 Answers  

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How generating electric power export to grid from the generating station ?

1 Answers  

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what is the function of garing capacitir in SF6 circuit braker?

1 Answers  

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Why not LED burn after showing alarm,as Alarm volt is 11- 13,But LED is of3 volt,why it isnt Burn??

1 Answers  

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if one potential missing in energy meter , how much % slow the energy meter?

1 Answers   NTPC, SK,

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The initial current is very large at the time of starting for almost all DC motors. SO WE USE STARTER FOR A SAFE STARTING but at our homes we don’t see any starters in our coolers, motors.WHY DON’T WE NEED STARTERS FOR THESE APPLIANCES?

1 Answers  

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Why a Transformer Noise during its running condition ??

11 Answers   NTPC, UPPCL,

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