Answer Posted / 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 |
Post New Answer View All Answers
what is your majour contributions in your present job
what is the minimum voltage require to injure our body?
in shunt clippers why a resistor is used in sereis with the input
what is meant by brushed alternator & its working principle ?
A 1F capacitor is charged to 100V initially. A 1H inductor is connected accros the capacitor througha a switch. The current in the circiut when the switch is closed is____
What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection
hi friends this is a newcomer in your community of enthusiastic peoples. i am preparing for SSC (CPWD JUNIOE ENGG EXAM FOR ELECTRICAL) pls guide me on the same how to crack it? PLS LET ME KNOW IS ANYONE THERE WHO PASED IT? CAN I GET THE QUESTION PAPERS OF PREVIOUS EXAMINATIONS?
For the requirement of a furnace of temperature range up to 1200 oC using silicon carbide rods, What is the required rate of transformer needed (please do it with all details)?
What are books to be referred for KPTCL exam?
What is the drawback of static coefficients?
How to calculate the sag of OPGW during stringing???
3 phase induction motor connection star or delta while using ac drive motor is .75 to 5.5 kw
diff. between tension mode & speed mode
In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes
Will an earth leakage trip be activated if the component or wiring is faulty on low voltage equipment.Example An electrical Cat Scarer placed in the garden and water gets into the wiring.
