what is the purpose of high speed earth switch in gas insulated substat

0 Answers   ABB,

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In constant power region of 3-phase IM torque-speed characteristics, if frequency increases voltage A does not alter B decreases C increases D none of above

1 Answers  

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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 happens if DG N earthing fails while running and N Earthing fails while Transformer on load ???what will be the impact ???????/

2 Answers  

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Why ferranti effect occurred in leading p.f load?

1 Answers  

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we have 350 kva capcitor bank which is not showing KW. dose capacitor shows kW OR not.

2 Answers  

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what are different types of alternator and discuss about the methods of cooling

16 Answers   Bhel, Jindal, L&T, Nalco, Vedanta,

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Difference of induction motor & servo motor ??

0 Answers   Macpower CNC Machines,

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Transformer not operated in dc ! why?

10 Answers  

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what is impedence of transformer? its formula

1 Answers  

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why induction motor's p.f 0.8

0 Answers   Suzlon,

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Why only 1 CVT in Y-phase is used for synchronization in 3 phase power system?

1 Answers   Reliance,

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