is there any role of power factor with frequency variation? and how we can manage the frequency variation?

2059

Can you any one explain application of buccholz relay operation and pressure relif device operation of power transformer

1862

Is there any guideline say about display of earthing value near to earth pit

1203

can anyone explain the star-delta motor control wiring ,which wire go where and how they operate?

1451

what is the formula for efficiency of francis turbine and generator for hydropower? what is best way to select francis turbine and generator?

2502

Which of the following alternatives will be cheaper (1) A 100 h.p AC, 3-phase motor (2) Four motors of 25 h.p each (3) Five motors of 20 h.p each (4) 10 motors of 10 h.p each explain

3030

HOW DO YOU CAN CHECK A 15KV DIODE, WHETHER IT IS OK OR NOT?

2049

Explain the difference between verilog task and verilog function?

1338

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

1947

Can we convert off line transformer to on line transformer

1984

Can we use shunt trip coil instead of trip coil with protection relay for protection?

1741

Is there any problem about which the drive (inverter) doesn't show/display the alarm and/or fault but instead of this , it doesn't work ? I want to know that could there be any kind of problem in the drive when the drive doesn't display the alarm and/or fault ?

1979

Dear all, how we select the cable size according  to current with or without including different correction factor , is there any direct method for sizing of cable... 

2162

What are the advantage of free wheeling diode in a full wave rectifier?

1127

what is the calculation formula for motor starting torque,running torque, running torque.

1693