(R) Ground Equipment - 400 Hertz Ground Power Performance Requirements
|Publication Date:||1 December 2018|
This SAE aerospace recommended practice (ARP) covers the requirements for external ground power equipment supplying 115/200 V, three-phase, 400 HZ output power measured at the aircraft receptacle. All forms of 400 Hz ground power including mobile and fixed systems are addressed by this document.
The intent of this document is to provide specifications for engine generators (alternator), motor generators, and solid-state converters tailored for performance with modern aircraft, applicable to all unless otherwise noted. Modern aircraft are requiring higher quality power without interruption which places new constraints on the ground power units (GPUs) such as unity power factor and no-break-power-trans
While GPUs are designed to provide the same quality of power as the aircraft's EPGS, there are differences in rated capacity. Engines powered GPUs must be sized for the peak kw specified which is why a 125% overload is specified for GPUs. As an example, increasing the size of the prime mover to match the aircraft's EPGS typical 150 to 200% overload rating would not be practical