What is YNyn Transformer? and what are the other types in this?

3 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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Pls explan the OLR setting in VCB at HT yard

0 Answers   Juniper Networks,

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Difference between drift current and diffusion current?

0 Answers  

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why the transformer has no starter

2 Answers   NTPC,

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What is a thermocouple, and it working principle?

2 Answers  

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in ct secondary one terminal is connected to earth why?

1 Answers  

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in telecom we are using neutral?

1 Answers  

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Why do we twist copper to make cable?

3 Answers   Bhel, Integrated, MR Cables,

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what is servo motor & how does it work.

0 Answers  

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how to calculate the capacity of the AC motor

1 Answers   TATA,

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What will be the direction of rotation of a Alternator in case it goes in motoring action when connected with grid ?

6 Answers   DVC, NTPC,

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