what will happen if the frequency supplied is more than the frequency of the instrument...?

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what is the essential resistance of r y b phase short citcuit ? Eg in star connection we doing this kind of short circuit oly

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How to know of any cable size if there are not written on cabl?

0 Answers   APGenco, El Seif,

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briefly explain the main blocks found in a microprocessor based system

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is it possible to use a tranformer to regulate an unstable system voltage?

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How we can measure the thickness of bus bar for a given load ? any farmula Plz elaborate clearly.

2 Answers   ITC Infotech, TCS,

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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 ) ?????

2 Answers  

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What will be the current if the resistance total in a series circuit doubles?

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Purpose of lighting transformer.

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Define piezo-electric effect?

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How to calculate phase to phase difference ?

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Define the overload capacity of the motor?

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