Relay diagram
A relay diagram was one of the circuit diagram documents for extensive relay circuits in the electromechanical telecommunications technology used until the 1980s . It shows the chronological order of the individual switching processes in the overall context of all parts of the relay circuit. A relay is an electromagnetic component with an armature and a set of contacts. These components are moving masses and are subject to inertia , which leads to a delay in switching operations. Further delays arise due to the electrical and magnetic processes occurring in the excitation circuit, such as self-induction of the coil, eddy currents in the coil core and remanence of the coil core. A relay therefore requires a certain switching time for the actuation of the contacts when it is picked up or released. These switching times are taken into account in the symbols in the relay diagram. They are in the range of a few milliseconds . With extensive relay switching, the switching times of individual relays can add up to a longer switching time.
literature
- Herbert Petzoldt: The telecommunication relay and its circuit. CF Winter'schen Verlagshandlung, 1952.
- Hans Kurt Ibing: look into the telecommunications system. Staufen Verlag, 1949.
Individual evidence
- ↑ Handbook of Telecommunications Technology, Volume 10, Basics of Switching and Assembly Technology, as of spring 1980, p. 206
Web links
- Comprehensive Relay Diagram Example (accessed July 13, 2017)