Electrical Distribution Systems SYSTEM COMPONENTS AND PROTECTION DEVICESSYSTEM COMPONENTS AND PROTECTION DEVICESNuclear facilities rely on dependable electrical distribution systems to providepower to key vital equipment. Knowledge of the basic electrical powerdistribution system and its components will help the operator understand theimportance of electrical power distribution systems.EO 1.1 EXPLAIN the following terms as they apply toElectrical Distribution Systems:a. Single (one-line) diagramb. Commercial or utility powerc. Diesel powerd. Failure-free powere. Neutral groundingf. Voltage classg. Protective relaysh. Overlapping protective zonesEO 1.2 DESCRIBE the protection provided by each of thefollowing:a. Fusesb. Protective relaysSingle(One-Line)DiagramA single, or one-line diagram of a distribution system is a simple and easy-to-read diagramshowing power supplies, loads, and major components in the distribution system (Figure 1).CommercialorUtilityPowerCommercial or utility power is electrical power that is provided by commercial generatingsystems to the facility.DieselPowerDiesel power is power generated by a diesel-driven generator. Diesel-driven generators are themost economical and practical source of "standby power."Rev. 0 Page 1 ES-15
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