tailieunhanh - STEAM POWER by Mike Brown_8

Tham khảo tài liệu 'steam power by mike brown_8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http MIL-HDBK-1003 7 standard short circuit ratios of at rated kVA and power factor. If a generator has a fast acting voltage regulator and a high ceiling voltage static excitation system this standard short circuit ratio should be adequate even under severe system disturbance conditions. Higher short circuit ratios are available at extra cost to provide more stability for unduly fluctuating loads which may be anticipated in the system to be served. f Maximum winding temperature at rated load for standard generators is predicated on operation at or below a maximum elevation of 3 300 feet this may be upgraded for higher altitudes at an additional price. Features and Accessories. The following features and accessories are available in accordance with NEMA standards SM 12 and SM 13 and will be specified as applicable for each generator Voltage Variations. Unit will operate with voltage variations of plus or minus 5 percent of rated voltage at rated kVA power factor and frequency but not necessarily in accordance with the standards of performance established for operation at rated voltage . losses and temperature rises may exceed standard values when operation is not at rated voltage. Thermal Variations a Starting from stabilized temperatures and rated conditions the armature will be capable of operating with balanced current at 130 percent of its rated current for 1 minute not more than twice a year and the field winding will be capable of operating at 125 percent of rated load field voltage for 1 minute not more than twice a year. b The generator will be capable of withstanding without injury the thermal effects of unbalanced faults at the machine terminals including the decaying effects of field current and DC component of stator current for times up to 120 seconds provided the integrated product of generator negative phase sequence current squared and time I22t does not

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