Is there any calculation to find unknwon(unferroled) phases R Y B in alternator,3 phase motor anybody shoot my problem. how can we notice this is the respective phase?

2 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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Why we not use the impedance relay in protection of short transmission line ?

4 Answers  

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what is the need of capacitor in transmission lines?and how it works.

2 Answers   SCCL,

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As i want some model question paper in basic computer science and history please send me immediately sir

0 Answers   TNPSC Tamil Nadu Public Service Commission,

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the inertia constants of two machines are respectively 30and 42 MJ per MVA.when the change in frequency due to change in load in first machine is 12 Hz,the change in second machine frequency will be?

1 Answers  

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distribution is maximum done by a)radial b)network c) parallel d)b & c

0 Answers  

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How can you limit the fault level in a power system?

1 Answers   Alfanar,

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How much resistance between neutral earthing and body earthing of Power transformer?

1 Answers  

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Do power transformers have an Automatic Voltage Regulator (AVR) just like the alternator/generator in a power system?

4 Answers  

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Why Humming noise originated in Starter motor and how it was generated ?

3 Answers  

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how we control the magnitude of a generator output

2 Answers   EESINT,

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