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WHAT IS LIGHTNING,HOW TO CALCULATE LIGHTNING DESIGN
CALCULATION?

Question Posted / surya

Answer Posted / surya

Discharge of charge from one cloud to another or to the ground

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Please Help Members By Posting Answers For Below Questions

hello everybody. what does an abnormal stator winding impedance or dc resistance show? thanx

1916

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

1965

what is the soft starter principle? how is connection diagram? what is the procedure for checking the connection?

2161

why we can stote dc? why we cant store ac?

2074

Explain the fundamental difference between emf (electro motive force) and pd (potential difference) ?

1136

What is highest size of HT motor like 11 kv or 33 kv,and how to make it 750 rpm.i think the size will be very big.any idea ? pl. reply..

1925

1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.

2185

What is the high series capacitance winding on high voltage power transformer ?

2167

WHAT R THE SAFETIES IN A HIGH TENSION PANEL N LOW TENSION PANEL. ALSO WAT SAFETIES R THERE IN A 200 KVA TRANSFORMER?

2261

how current is reverse from its normal direction during the fault?

2455

what are factors to be consider in electrical installation like load factor,diversity factor .....

1807

Why does increasing the magnetic flux in the main field of a d.c motor cause the armature current to reduce??

2032

what is allowable ac mixing in dc

2102

how to calculate percentage impedence at 75 deg C at normal tap

2260

why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.

2135