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?
1616technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"
1639what happens when one of the phases out 0f 3 phases been removed under working condition and no load condition will the machine run if so plz send me why
2 3927Why the earth cable have current 1A - 2A , it is safety for Electrical system or earth cable should be zero amps ? how to troubleshoot?
1681Post New Electrical Engineering Questions
when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com
what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?
how to compute kvar in substation feeder to improve power factor and sending voltage
Can anybody please refer the best and simple book for about Protection relays and in detail of all its protection ?
why 5kW motor becomes unbalance if its relay trip 1st time and its set value is 7.0 A
How to improve fuel cell in a distribution system?
Why the magneti fields are not passes from southpole to north pole
suri transmission
what is the relation between knowing of the distance between power transformer and the capacitor feeder in case of parallel operation
Explain (in simple ) - root mean square. whats its role in electrical fundamandal.where its used
what parameters are should nessary for control technic dc drive(in rolling mills)?
concept of busbar and load dispatching..?
3 phase Motor will be given 2 phase after 2 to 5 second we given 3rd phase so Motor Run sum-time in forward or sum time run reverse direction. All time phase sequence is not change. Why motor run in reverse direction? Please Explain........
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
mostly the questions were from machines... d.c. machines, transformer, synchronous and induction all theory paper........ few from power system... but the level of paper was easy.....
