Answer / parveen

because fans are used to get air that's why design of fans are like that they rotate in anticlockwise if fans suck the air like exhaust fans they are rotate in clockwise direction.

Answer / veeresh

If the fan rotate in clock wise direction , it will suck
the air and push to other side . The fanblades are designed
such way to pump the surrounding air .

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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