Answer Posted / pijush

as above

For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?

2327

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How to Prepare preventive maintenance shedule of machine tool.

2027

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How to calculate main incomer rating of APFC Panel ? Let's say i want to find main incomer for 11kV, 1000kVAR Panel.

1957

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What is the formula to calculate the rating of power cable for three phase current.

2141

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i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.

1933

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we have 3.5MVA-11/6KV transformer. how can we calculate earth fault current and NGR calculation?

1541

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What is the function of RCBO? What are the different sensitivity ratings & each application?

2825

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we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.

1922

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WHAT CAUSED THRESHOLD VOLTAGE TO EXIST?

4075

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if a number of plc s are there then how many modbus to be used

1966

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we have 3 single phase transformers. how will we generate 6 supply from 3 phase supply input

2123

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l&t switch FN 63 handle position can we change

2569

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What is reactive power and where it is used.

1704

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WHAT IS MEANING OF Gg & Gg IN hrc FUSE

3287

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What is the practical way to calculate the cable size for known ampere load?

1441

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