What is the difference between a fault passage indicator (FPI) and a relay (for example relay 50, 51, 67N) ? Are they the same thing?
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1\$\begingroup\$ I don't know what a fault passage indicator is, but the fact that it has a fairly specific-sounding name would indicate to me that it's probably something more special-purpose than a relay. And the fact that a relay is not something I would generally call an "indicator" of any type. \$\endgroup\$Hearth– Hearth2022-01-29 20:05:54 +00:00Commented Jan 29, 2022 at 20:05
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1\$\begingroup\$ A fault indicator is a device that clamps on to a distribution conductor and if current exceeds a set threshold it will give indication (visual or via radio when interrogated). See this. Saves time when linemen are out looking for a fault location. \$\endgroup\$relayman357– relayman3572022-01-30 00:04:54 +00:00Commented Jan 30, 2022 at 0:04
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1\$\begingroup\$ Thank you very much! It's clear! \$\endgroup\$Samuele Benito Di Gioia– Samuele Benito Di Gioia2022-01-30 08:15:16 +00:00Commented Jan 30, 2022 at 8:15
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A fault passage indicator is used by electric utilities to visually indicatd (such as by a mechanical flag) that a fault has occurred on a transmission line. A relay is an electrical switch that can be actuated by some sort of signal such as AC or DC voltage. The two devices are unrelated although, perhaps, a relay could be used as part of an FPI.
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\$\begingroup\$ Thank you very much! It's clear! \$\endgroup\$Samuele Benito Di Gioia– Samuele Benito Di Gioia2022-01-30 08:15:39 +00:00Commented Jan 30, 2022 at 8:15