Calculating generator reactances - Cummins Inc.
480 volt alternator on a 750 kW DFHA generator set. From the generator set specification sheet, S-1132, the alternator data sheet is ADS-311. ADS-311 shows a sub-transient reactance of 0.16 P.U. based on the 125°C alternator base rating of 1300kVA. The base kVA rating of the 750DFHA is 938 kVA. Using the formula, calculate X" d
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incal.cummins.comwhether the application is for standby power, prime power or utility paralleling. Standby power systems generally have no overload capability. Prime power ... Factor is the ratio of kW to kVA and is expressed as a decimal figure (0.8) or as a percentage (80%). ... to 1.15 times the steady-state running load for 12-pulse. These loads are ...
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