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Description of 305-1969 1969- Superseded. Electric, power systems, having outgrown simplicity a long time ago, continue to require more and better protection as the demand for power increases and the need for reliability becomes greater. Protective relaying has met this challenge by providing more sensitive, higher speed relay systems that are inherently reliable. Among the more significant protective developments that furthered the economic design of power systems are pilot, relaying schemes and direct, transfer tripping over telephone channels. In recent years a growing need developed for more versatile wire-pilot relay systems and more secure means for direct transfer tripping. These factors, in addition to technological changes in telephone communication plants affecting availability of metallic, telephone circuits, led to the consideration of audio-tone signals over telephone channels for these functions. Since audio tones had already been employed extensively for less demanding applications—telemetering, telegraphy, dial signaling, etc.—it appeared logical that audio tones could also be employed successfully for remote tripping of circuit breakers and wire-pilot relaying.This book also exists in the following packages...Subscription InformationMADCAD.com IEEE Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time. Listed IEEE Standards prices are applicaple for US firms whose annual revenue is less than $400 million. All others, please contact us at info@madcad.com or +1 800.798.9296.
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About IEEEIEEE is the world's largest professional association dedicated to advancing technological innovation and excellence for the benefit of humanity. IEEE and its members inspire a global community through IEEE's highly cited publications, conferences, technology standards, and professional and educational activities. IEEE, pronounced "Eye-triple-E," stands for the Institute of Electrical and Electronics Engineers. The association is chartered under this name and it is the full legal name. IEEE creates an environment where members collaborate on world‐changing technologies – from computing and sustainable energy systems, to aerospace, communications, robotics, healthcare, and more. The strategic plan of IEEE is driven by an envisioned future that realizes the full potential of the role IEEE plays in advancing technology for humanity. The IEEE Brand Identity Toolkit explains the basic usage rules for all corporate identity elements and how to utilize them to create a powerful and consistent communications pieces. IEEE is led by a diverse body of elected and appointed volunteer members. The governance structure includes boards for operational areas as well as bodies representing members in the 45 Societies and technical Councils and ten worldwide geographic regions. |
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