how can we test the polarity of a 3-phase transformer?

2 Answers  

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WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.

0 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 is the meaning of TPN

2 Answers  

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what can be the causes of capacitor start motor having a higher current that its actual

0 Answers  

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what is power factor

7 Answers   Eskom,

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How to calculate voltage drop in copper and aluminium cable? I have laid 240Sq.mm Aluminium cable for the length of 600 Mtrs in 1 Mtrs underground. Normal load is 150A. Transformer is 630KVA, 6.KV/433V. But, I am getting only 395 Volts when load. How to calculate voltage drop and what is the permissible voltge drop for this circuit?

1 Answers  

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How can we prevent the (Home)inverter supply flow to the main supply line?

1 Answers   L&T,

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what is gas turbine intercooling ?

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If i am running of spindle at 2000rpm ,but How to spindle stop at the second I am resetting the machine in CNC machines

0 Answers  

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What is difference between Harmonic and Non harmonic Capacitor Bank?

0 Answers   TATA,

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Why does inductive loads consume KVARs?

0 Answers  

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