Research Electrical Power
Electrical power for research equipment is supplied by a 300 amp, 28 VDC generator driven by the left-engine that is independent of the aircraft's electrical system. A bank of 4 inverters supplies 4,000 VA of 110 VAC and another bank of 4 inverters supplies 4,000 VA of 220 VAC 60-Hz single-phase power. Plug units on the belly of the G-1 allow connection via heavy-duty extension cables to shore 110 VAC and 220 VAC power for the research equipment. While there is 28 VDC power when the engines are running, DC power on the ground must be provided by a Ground Power Unit or small AC-DC power units. There is no 400-Hz power on the G-1. Prior to and during the equipment-installation phase, the power consumption (including current draw and power factor) is measured for all equipment and instruments. This information is used to balance the load among the circuits supplying 110 and 220 VAC power.