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1 <br /> 6. Frequency variation shall isochronous under varying loads from no load to 100% load. <br /> r7. Random frequency variation shall not exceed+/- 0.25% of its mean value from no load <br /> to full load. <br /> ' 8. The insulation material shall meet the NEMA standard (MGI-22.40 and 16.40) for class <br /> H and be vacuum impregnated with epoxy varnish to be fungus resistant per MIL <br /> I-24092. <br /> 9. The excitation system shall be of brushless construction controlled by a solid state <br /> voltage regulator with adjustable volts-per-hertz operation capable of maintaining <br /> voltage within+/-2%at any constant load from 0 to 100% of rating. The regulator shall <br /> be sealed from the environment and isolated from the load to prevent tracking when <br /> connected to SCR loads. <br /> 10. Semi-flexible disc direct coupling to engine flywheel. <br /> 11. Maintenance free bearings. <br /> 12. Radio interference suppression to meet the BS.800 and VDE Class G and N standards. <br /> 13. Telephone interference factor of less than 50 per NEMA MGI-22.43. <br /> 14. AC voltage waveform total harmonic distortion of less than 5% total from no load to full <br /> load. Any individual harmonic shall have less than 3% THD. <br /> B. On starting each listed load across the line, the instantaneous voltage dip shall not exceed <br /> 25% and shall recover to +/- 2% of rated voltage within one second. <br /> C. The generator shall be capable of sustaining at least 250% of rated current for at least 10 <br /> seconds under a 3 phase symmetrical short by inherent design or by the addition of an <br /> optional current boost system. <br /> ' D. The generator shall be capable of providing a minimum of 150 kW for motor starting and for <br /> continuous operation. <br /> 1 <br /> ENGINE GENERATOR <br /> 11500 - 11 <br /> r <br />