The electric power management system on the Space Station will require a complete spectrum of switchgear, power controllers, remote controlled circuit breakers, and conversion equipment. This paper describes some of the AC and DC equipment currently being developed for potential Space Station application.
The AC equipment includes High Power Switchgear with 12 switches rated at 440 Vac, 34 Amps; Remote Power Controllers with 2 poles rated at 115 Vac, 43 Amps; three phase Remote Controlled Circuit Breakers rated at 440 Vac, 43 Amps; and a Remote Controlled Switch rated at 115 Vac, 50 Amps. The DC equipment includes a two pole Remote Power Controller rated at 150 Vdc, 40 Amps and a Remote Controlled Circuit Breaker rated at 150 Vdc, 33 Amps. The conversion equipment consists of a 25 kW, 150 Vdc to 440 Vac Converter. Distribution equipment being developed includes a 15 kW, 440 Vac to 115 Vac Isolation Transformer and a 5 kw, 440 Vac to 150 Vdc TR Unit.
Most of this equipment is designed to allow connection to a Power System Controller through a MIL-STD-1553B Data Bus. The Data Bus provides a pathway for control and status data to and from the equipment and allows reporting of system loads and voltages via built-in monitoring circuits.
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