How can we measure the frequency of a rotor running in full
load condition? Explain the method of measuring.
Answers were Sorted based on User's Feedback
Answer / nanda
U can first measure the rotor speed at full load using a
tachometer..note down the Rated speed frm the panel board
and take it as NS.. rotor speed as NR.
Slip is equal to NS-NR/Ns....so the rotor freq Fr is
slip * AC supply frequency
Is This Answer Correct ? | 22 Yes | 1 No |
Answer / manikiran
Frequency of a rotating machine can be found by Stroboscope..
It makes use of Stroboscopic Effect.When the frequency of
the Incident light is equal to the rotating speed (measured
as frequency of the point moving ) it appears to be
static...and the corresponding speed gives the speed of the
machine..
Or it can also be measured by a tachogenrator...
Is This Answer Correct ? | 8 Yes | 3 No |
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How much allowable difference current between on three phases Dear sir, We have a 1870 KW HT motor, 11 Kv supply,FLA-120A,2870 rpm,2-pole squirrel cage induction Motor.And stator is connected in star connection with Liquid resistance stater to limit the starting current.It has coupled with Centrifugal air compressor.My question is it is loading 73% of FLA taking R-phase 86.7 A, Y-phase-85.4A,B-phase- 78.3A.why the B phase current is that much of difference.Is it allowable, or any one tell me how much allowable current.If any method to calculate.
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