i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

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Going in for a three phase motor or a single phase motor, what factor should be considered for this? For eg., to pump water to certain height and such domestic applications, which motor is suitable?

1 Answers  

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what is Insulation monitoring device. where it is used? (in switchgear room or control panel or in field equipment)

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What is the simplest formula to calculate the rotor diameter of a synchronous generator?

0 Answers   PEI,

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send me all basic electrical question and answers

0 Answers  

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I am looking for LV CT test. To check the polarity of the CT only. Can you suggest any supplier. Different companies are offering CT/PT Tester which is expensive. Thanks

2 Answers  

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I am having dual speed motor of cromton greaves make of 3.7 KW -1400 rpm and 5 KW - 900 rpm. Please let me know groups and winding connction for rewinding purpose.

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should %impedance be high or low in a power transformer? if so why?

0 Answers  

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what is the diff. between power transformer & distribution transformer.....

5 Answers  

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What is float cum boost charging system?

0 Answers  

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What is Harmonics how it is produced and what is the method to control the same

0 Answers   Siemens,

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What is Vk and Imag i.e Knee point voltage & Magnetising Current? How to calculate above values? How to define accuracy class 5P10?

7 Answers   Deccan Cements, Doosan, Torrent Power, Transco,

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