derive the e.m.f equation of transformer

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what are earthing material

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Is there any standard guidelines/Criteria to design NGR/NGT.?

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how can a transformer test by megger?

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What happens if the negative to earth voltage is greater than positive to earth voltage in the battery of substation?

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what happens when a dc shunt motor fed with an alternating suppy ?

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Dear sir, iam completed iti ncvt electrician 2000-2002 & diploma electrical eng completed 2008-2010 distance education in rvd university, still i got B licences only but my working company want C licences, how to i get c licencese pls reply me iam in critical situation thank you karthick 9841637803

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How to select power cable for machine

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Why transformer making sound during operations?

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I need bhel previous year quetion papers for electrical engineering department.I searched but i could not find out

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This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

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Does induction motor start with dc power supply????

4 Answers   Essar,

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