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AUDIO TONE TELEPROTECTION TERMINAL
http://www.spader-assoc.com/datafile/PTR_1500_Brochure.pdf
The PTR-1500 is a four channel audio tone protective relaying terminal used for high speed tripping in protective schemes for electric power generation and transmission. The PTR-1500 can communicate over voice-grade telecommunication (i.e., carrier, wire line or metallic pairs and microwave) or fiber optic lines.
Iniven offers PTR-1500 an Audio Tone Teleprotection Terminal
http://iniven.com/products-and-services/protective-relaying.html
The PTR-1500 is a four channel audio tone teleprotection terminal used for high speed tripping in protective relaying schemes for electric power generation and transmission. The PTR-1500 can communicate over a voice grade telecommunications medium (i.e. carrier, wire line, metallic pairs and microwave) or over fiber optic lines.
IEEE C37.93-2004 - IEEE Guide for Power System …
https://standards.ieee.org/standard/C37_93-2004.html
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 …
C37.93-2004 IEEE Guide for Power System Protective …
https://smartgrid.ieee.org/about-ieee-smart-grid/standards/ieee-approved-proposed-standards-related-to-smart-grid/c37-93-2004-ieee-guide-for-power-system-protective-relay-applications-of-audio-tones-over-voice-grade-channels
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 …
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