MIL-PRF-21480B
CONTENTS
PARAGRAPH
PAGE
3.4.5
Configuration .......................................................................................................... 6
3.4.6
Consolidation of generating system components ................................................... 6
3.4.7
System control ........................................................................................................ 6
3.4.7.1
Manual system control ............................................................................................ 6
3.4.7.2
Automatic reset (engine shutdown/underspeed) ..................................................... 7
3.4.8
System capacity (power source rating) ................................................................... 7
3.4.8.1
Continuous capacity (AC power)............................................................................ 7
3.4.8.2
Overload capacity (AC power) ............................................................................... 7
3.4.8.2.1
Motor starting (AC power) ..................................................................................... 7
3.4.8.2.2
Emergency overload (AC power) ........................................................................... 7
3.4.8.3
Short circuit capacity (AC power) .......................................................................... 8
3.4.8.4
Integral control power capacity .............................................................................. 8
3.4.8.4.1
Excitation and control of AC power ....................................................................... 8
3.4.8.4.2
Rating of DC power source..................................................................................... 8
3.4.9
System design (generator and control components) ............................................... 9
3.4.9.1
Shaft speed .............................................................................................................. 9
3.4.9.1.1
Maximum speed for regulation ............................................................................... 9
3.4.9.1.2
Overspeed ............................................................................................................... 9
3.4.9.2
Mounting and driving provisions............................................................................ 9
3.4.9.2.1
Shaft spline.............................................................................................................. 9
3.4.9.2.2
Shear section ......................................................................................................... 10
3.4.9.2.3
Maximum torque................................................................................................... 10
3.4.9.2.4
Flexible drive ........................................................................................................ 10
3.4.9.3
Electric connections .............................................................................................. 10
3.4.9.4
Direction of rotation.............................................................................................. 11
3.4.9.5
Efficiency (heat rejection)..................................................................................... 11
3.4.9.6
Cooling.................................................................................................................. 11
3.4.9.6.1
Air cooling (convection or forced air) .................................................................. 11
3.4.9.6.2
Liquid cooling ....................................................................................................... 11
3.4.9.7
Generator service life ............................................................................................ 12
3.4.10
Control component service life ............................................................................. 12
3.4.11
Color ..................................................................................................................... 13
3.4.12
Markings ............................................................................................................... 13
3.4.13
Adjustments .......................................................................................................... 13
3.5
Electrical performance .......................................................................................... 13
3.5.1
Voltage limits for normal operation...................................................................... 13
3.5.1.1
Voltage limits for AC power source ..................................................................... 13
3.5.1.2
Voltage limits for DC power source (see 3.4.8.4.2............................................... 13
3.5.2
Voltage modulation (AC power source) ............................................................... 13
3.5.3
Voltage unbalance and phase displacement.......................................................... 14
3.5.4
Voltage waveform (AC power source) ................................................................. 14
3.5.5
Voltage ripple and distortion (DC power source) ................................................. 14
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