The Relay Testing Handbook: Understanding Digital Logic explains the different forms of relay logic used in modern microprocessor based relays. Each type of relay logic is described in detail with practical examples to demonstrate how relay manufacturers use common relay logic principles applied with different style interfaces such as: Individual element schemes (GE SR and Beckwith relays); Binary relays (Alstom and Siemens relays); Arithmetic (math) schemes (Schweitzer Engineering Laboratories relays); Logic schemes (General Electric UR relays). Use the practical examples outlined in this volume to help you: Understand and use logic gates such as AND, OR, NOT, NOR, NAND, and more; Use logic comparators and timers; Convert relay settings from one logic format to another; Convert logic schemes into DC schematics to help understand and commission logic systems; Understand the protective relay logic used in nearly every in-service relay today Get more information at... More > http://valenceonline.com.< Less
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