how to calculate the over current rating of 3phase motor
Answer Posted / dk gnfc
Overcurrent means short ckt in CTMM relay for motor protection, so short ckt settinng alway 700 to 1300% in every 3 phase motor
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Why is better to have a minimum ceiling voltage of 250% than 160%?
in ring main system we use the isolater b/w transfer bus and main bus if we r not use isolatar than wat will be the effect in our sys.
How to justify this statement ??? "Capacitors in series provide less capacitance but higher voltage breakdown rating for the combination"
what are the advantages and disadvantages of speed control of 3 phase induction motor by varying frequency explain with drawing
234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,
What are the functions of different probes used in cro?
what is PWM in IGBT and how it works for drive.?
what is earth resistance? how to measured? and give values at power station and mcc area?
how test transfomer(3 phase75kva) by megger
what is the meaning of 0.5ohm Resistance
in the case of 6.6kv motor starter combination contain fuses on it VCB. but in 11KV motor starter combination Fuses are not using in it's VCB why?
In TNC switch, is there any 1NO+1NC block ? and if we move over closing position, is ther any affect on trip position or vice versa?
1)How much current can a 3-1/2 core 100 mm wire carry? 2)What are the special cables required for explosion proof wiring? 3)In case you do not have coal and salt for earthing, how can you achieve good temporary earthing? 4)One horse power single phase motor is more likely to get hot than a one horse power 3 phase motor. Is it true or false, if true why? 5)What are the different types of soft starters for large motors?please explain?
what is W.T?specify the acceptable range?
DEFINE BREAKING CAPACITY OF BUSBAR & HOW IT IS CALCULATED?