PROTECTIVE DEVICE COORDINATION STUDY Sample Clauses

PROTECTIVE DEVICE COORDINATION STUDY. The protective device coordination study shall compare upstream and downstream protective devices to ensure proper electrical system reliability and that USCG coordination requirements are met. Protective device coordination and selectivity shall be provided so that, for a fault on any part of the system, the fault is cleared by the protective device that is closest to the point of fault without tripping upstream breakers in accordance with USCG, 46 CFR, subchapter J, subpart 111.51. Time-current plots shall be included in the study showing the time-current curves (TCC) of all protective devices for each major path in the electrical system. .This includes individual plots for all protective devices between the generator and each vital load fed directly from the main switchboard, and for all protective devices between the generator and one branch circuit load in each of the distribution panelboards Electronic trip circuit breakers shall be provided where required for proper coordination. As a minimum, each TCC plot shall include a one-line diagram for the given plot in addition to the following breaker information: • Device ID • Manufacturer • Trip element type/model • Frame size • Trip rating (thermal magnetic trip units) • All other breaker settings (electronic trip units) For breakers with electronic trip units, the barge contractor shall verify the settings of the installed breakers are consistent with the settings of the final coordination study upon completion of Phase III of the contract.
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PROTECTIVE DEVICE COORDINATION STUDY. The protective device coordination study shall compare upstream and downstream protective devices to ensure proper electrical system reliability and that USCG and ABS coordination requirements are met. Protective device coordination and selectivity shall be provided so that, for a fault on any part of the system, the fault is cleared by the protective device that is closest to the point of fault without tripping upstream breakers in accordance with USCG, 46 CFR, subchapter J, subpart 111.51. Circuit breaker trip elements shall be used to ensure that each breaker is rated for values up to and including the maximum symmetrical fault current value determined in the FAULT CURRENT ANALYSIS without tripping any upstream breakers. Time-current plots shall be included in the study showing the time-current curves (TCC) of all protective devices for each major path in the electrical system. These time-current curves shall be generated using EasyPower software. Time ‘tic marks’ shall be placed on the curves to show the maximum symmetrical fault current value for each individual breaker. This includes individual plots for all protective devices between the generator and each vital load fed directly from the main switchboard, and for all protective devices between the generator and one branch circuit load in each of the distribution panelboards. Electronic trip and other circuit breaker elements shall be provided where required for proper coordination. See the following picture for a model TCC curve For breakers with electronic trip units, the Contractor shall verify the settings of the installed breakers are consistent with the settings of the final coordination study upon completion of Phase III of the contract.
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