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What is IDMT relay how it works.
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Answer Posted / hebson ombati
the inverse definate minimum time comprises of upper and
lower electromagnets.it have two windings primary which is
connected to current Tx and seconary.due to induction the
secondary is energised hence setting aflux .the leakage
flux from the upper magnet entering the disc have been
displaced in phase from the disc from the lower magnet. The
deflecting torque is produced on the disc in the fashion as
already explained.
The spindle of the disc carries a moving contact which
bridges two fixed contacts after the disc has rotated
through a certain angleThe speed of rotation of the disc is
dependent upon the angle the torque which in turn is
dependent on the current setting,
when the load current increases from this setting it will
increase the speed of rotation of the disc resulting into
decrease of operation time.
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