IEEE 305-1969
IEEE Guide for Protective Relay Applications of Audio Tones over Telephone Channels
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- Language: English
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About This Item
IEEE 305-1969 is a technical guide for protective relay applications of audio tones over telephone channels, addressing how tone-based signaling can be used in communication-linked protection schemes. It is relevant to systems where relay operations depend on reliable transmission of control or trip information through voice-grade channels. IEEE 305-1969 helps define a common engineering reference for planning, applying, and evaluating these arrangements, with attention to the constraints of communications and signal handling.
About IEEE 305-1969
This standard focuses on the application of audio tones within protective relay systems that use telephone channels as the communication path. In that role, IEEE 305-1969 provides guidance for engineering decisions involving signal transmission, relay coordination, and the practical limits of tone-based control over analog channels. It is most useful where protection and communications must work together reliably, and where consistent application can reduce ambiguity during design, testing, and system integration.
Where is IEEE 305-1969 used?
IEEE 305-1969 is typically used in utility and industrial protection environments where telephony-based links support protective relay functions. That may include channel-connected schemes for transmission line protection, remote tripping, or coordinated control between substations and related networked equipment. The document is also relevant to engineers working with audio-tone signaling, telecommunications interfaces, and signal processing paths that must support dependable relay action over telephone channels.
Importance in practice
In practice, IEEE 305-1969 matters because protective relaying depends on timing, signal integrity, and predictable channel behavior. Using a recognized guide can improve design consistency and help teams assess whether audio-tone arrangements are suitable for the intended service. It also supports clearer procurement and testing decisions by giving engineers a common technical basis for performance expectations, reducing the risk of misapplication in communication-dependent protection systems.
- Protective relay applications
- Audio-tone signaling over telephone channels
- Communication and signal handling requirements
- Design, testing, and application guidance
- Superseded IEEE reference
- Publication Date: 1969
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Communication, Networking and Broadcast Technologies; Signal Processing and Analysis
- Official IEEE: Doi link
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