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How Binary channel supervision works in Arc Protection relay VAMP 321
Binary channels are supervisied with the test pulses which are sent by binary-out channel (BO) & received by binary-in channel (BI).
Binary-out sends a test pulse in every 137 msec.When binary-in channel dosen't receive a test pulse inside the 500 msec delay, ASF
Arc Function Self Supervision is activated.

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