The Behavior of an Induction Type Protective Relay, With Special Reference to its Floating Phenomenon

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The effect of temperature upon the time limit of an induction type relay is very remarkable beyond expectation, especially so for small Ampere setting.The angular displacement of the relay disc by over load is more accurately recorded than in Mr. Kamiya's experiment and the effect of holes in the aluminum disc of the relay is clearly demons strated.When intermittent over-currents are sent through the relay, the disc makes to and fromovements and comes at last to the final contact. The angular displacement is recorded by means of a specal recorder.A rotating commutator makes a sip all current and an over current to flow alternately through the relay. The ratio of duration can be varied at will, and the period of alternation can also be freely varied between 0.03 sec. and 15.0 sec.If the over-current flows for a time somewha shorter than the time-limit and ceases, then the disc will begin to return to its normal positios. But, owing to its slow backward movement, if the second over current would come after a sho t interval, the disc would come to its final contact much faster than its prescribed time-limit.The motion of the relay disc under intermittent over loads are fully studied and it is shown that the time-limit may often become quite uncertain due to its flcating effect.
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