How can we measure the frequency of a rotor running in full load condition? Ex

How can we measure the frequency of a rotor running in full
load condition? Explain the method of measuring.

Question Posted / purushottam

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How can we measure the frequency of a rotor running in full load condition? Explain the method of ..

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

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How can we measure the frequency of a rotor running in full load condition? Explain the method of ..

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...

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