How to size the Neutral grounding resistor?
Answer / nagarajan
For example 20/25MVA Power Trans -132/6.9kv
1. FLC of Secondary=2092A
2.Phase to Phase Voltage for Secondary=6.9/1.732=3.98Kv
3.NGR =3980/2092=V/I=1.90Ohms for 30sec
It is only for power transformer.
Is This Answer Correct ? | 2 Yes | 1 No |
whata is battery charger ?how many cells connected for 110v?
What is the Different Between Breaker and One and half breaker.
where is highest transmission voltage is used in india
What should be the BDV value of a new transformer oil
1.why is +1+1=+2 why cant it be +3 2.Why is +1*-1=-1 why cant it be something else 3.why are the hilly areas more cooler than the ordinary areas?
How to calculate the value of capacitance of a capacitor used in power factor improvement plant if we know KVAR and voltages?
In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring
Can any one tell me the current VAT, Sales Tax, Octroi and Excise duty for the financial year 2009 -2010. Say control panels are manufactured in maharashtra, then what will be the taxes for within Maharashtra and outside Maharashtra?
In 400KV Switchyard, we have used Circuit Breaker With PIR, what is the significance of PIR & why they'r used?
what is auto transformer?
a 230v transformer with step down ratio 19:1.it has 2000turns on primary and rated 25va calculate max primary current no of secondary turns volts/turn
what is diffrence between dc motor and dc generator?