hi Is there any possibilities to find out the rotation of a shaft or something else by using electromagnectic waves or by IR rays.If s then can v change the dir., of rotation of the same by remotely?& how? plz dn't any1 say "NO r CAN'T"

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how we findout a ignater is faulty or not?

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r we are using in gas turbine mark (5) frame (6) (made in india Bhel 1997) Ā

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hi,every one, i have to write the search paper on "performance policy optimization" of NGN (next generation networks). i need the material on this topic. can any body help me. please tell me any useful site where the good material is available and name of any reference book. it should be a great help for me.

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Why we use Delta connection in the secondary side of a High Voltage transformer?

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what is the relationship between phase & neutral

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in 3-phase transformer which type of transformet is used in output side?

6 Answers   Essar,

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What will happen if we give the 3 phase supply to the rotor of slipring induction motor?

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How can we check ELCB trip current sensitivity How can we check earth resistance value

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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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What is meant by derating factor?

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Why winding temperature ct placed in B-Phase of the transformers?? 

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