Protection Requirements and Concepts for Data and Control Lines. Revision.
LIGHTNING ELIMINATION ASSOCIATES SANTA FE SPRINGS CA
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Data and Control Systems have a high susceptibility to anomalous voltages of many forms, usually created by outside influences, but sometimes created within the system itself. These anomalies may be classified as destructive-requires maintenance to restore operation or disruptive-requires a rerun of at least part of the program. There is now a requirement for intrinsically safe circuits ISC which has complicated the problem because the ISC involves the data and control circuits at the same point as the subject anomalies. The ISC must be designed such that in an explosive environment the energy available at the terminations would not initiate an explosion. These requirements may seem unrelated, however, both involve energy control, both involve similar technology, and both require implementation at the system interfaces. This paper is to deal with the protection of phone lines, data and control lines, single wire, coaxial lines and multipaired cables against these anomalies. The paper defines the requirement parameters, the various forms of contemporary protectors, the rationale for the design of the LEA Transient Eliminator family of products and the performance objectives for these LEA TE units.
- Electrical and Electronic Equipment
- Safety Engineering
- Non-Radio Communications