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200 10$aIEEE guide for power system protective relay applications of audio tones over voice grade channels /$fIEEE Power Engineering Society Power Systems Relaying Committee, IEEE-SA Standards Board
210  1$aNew York, NY :$cInstitute of Electrical and Electronics Engineers,$d2004.
215   $a1 online resource (v, 42 pages) $cillustrations
311   $a0-7381-4014-7 
330   $aThis document provides guidelines for applying audio tones over voice grade channels for power system relaying. Included are sections on transmitting and receiving equipment, leased voice grade channels, application principles, installation, and testing. The primary purpose of this document is to guide the power system user in applying, installing, and operating audio-tone protective relaying systems over voice grade channels. Secondly, it is to provide a reference for equipment manufacturers engaged in the design and application of relaying equipment and for telephone personnel engaged in providing telecommunications channels for audio-tone protective relay schemes.
517   $aIEEE Std C37.93-2004 (Revision of IEEE Std C37.93-1987): IEEE Guide for Power System Protective Relay Applications of Audio Tones Over Voice Grade Channels
517   $aIEEE Std C37.93-2004 
606   $aProtective relays$xStandards
606   $aTelephone communication channels$xStandards
615  0$aProtective relays$xStandards.
615  0$aTelephone communication channels$xStandards.
676   $a621.317
712 02$aIEEE-SA Standards Board,
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906   $aDOCUMENT
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996   $aIEEE guide for power system protective relay applications of audio tones over voice grade channels$93574549
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