SYSTEM COMPONENTS AND PROTECTION DEVICESElectrical Distribution SystemsSummaryThe important information contained in this chapter is summarized below.System Components and Protection Devices SummarySingle (one-line) diagram - simple and easy to read diagram showing powersupplies, loads, and major components in the distribution systemCommercial or utility power - electric power supplied to the facilityDiesel power - economical/practical source of standby powerFailure-free power - power supplied to vital equipment with automatic switchingso that interruption of power is minimizedNeutral grounding - helps prevent accidents to personnel and damage to propertyby fireVoltage class - high voltage > 15,000 volts, intermediate voltage is 600-15,000volts, low voltage 600 voltsProtective relays - cause prompt removal of any part of a power system thatsuffers a short circuitOverlapping protective zones - created around each element of the power systemto prevent element failure from interrupting the whole system operationBreakers - disconnect component from the power systemFuse - protects component from overcurrentES-15 Page 6 Rev. 0
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