What is negative phase sequence?
Answer Posted / pradipto dhar
negative phase sequence is equally in magnitude, placed
apart 120 degree, rotate in oppsite direction to the
direction of phase sequence (RYB).
| Is This Answer Correct ? | 14 Yes | 22 No |
Post New Answer View All Answers
What is speed mode?
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 ?
What is the voltage gain or transfer function of amplifier?
I have a drawing of a wound rotor induction motor for a crane. This crane motor has 5 forward speeds & 5 reverse speed implemented of course with different amount of resistance for each speed setting selected. What has got me scratching around is the fact that 8 of the 10 speed selections switch in uneven (unbalanced) amounts of resistances on each of the 3 connections to the motor's rotor.Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. I would greatly appreciate anyone's comments on this. Many thanks, Confused.
WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??
what is the use of static frequency converter and static excitation equipment? and where it is employed? for what?
BRIEFLY EXPLAIN THE STORAGE CLASSES AND THEIR TYPES IN C
the problem faced on star or delta winding connection??
what is the most permissible winding temp when we conducting a generator load test?(condition no load)
The screw thread commonly used for transmission of motion is one of the following types of threads
Earth bits close or open. Which is correct
If ROC does not lies inside unit circle,then ? a) Fourier transform converges b) Z transform converges c) Hatly transform converges d) Colpit Transform converges.
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
how to calculate the loss tangent of electrical cables
why we change the direction of winding in rotor ?how we make the north and south pole?