IEEE C37.93 Guide for Power System Protective Relay Applications of Audio Tones Over Voice Grade Channels
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IEEE C37.93 Document Information:
Title
Guide for Power System Protective Relay Applications of Audio Tones Over Voice Grade Channels
The Institute of Electrical and Electronics Engineers, Inc.
Publication Date:
Mar 25, 2004
Scope:
This guide contains information and recommendations for applying audio tones over voice grade channels for power system relaying, including transmitting and receiving equipment, leased voice grade channels, application principles, installation, and testing. Reflected in this guide is the knowledge and experience of equipment manufacturers and telephone companies as well as that of power utility users.
This guide is not intended to supplant specific or general instructions contained in the manufacturers’ instruction books or in any contractual agreement between a manufacturer or telephone company(s) or both and a purchaser of a given relaying system. The figures in 4.3 are used for illustrative purposes only and do not represent the preferred protection under all conditions.
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