Power Fault Protection
Power System Fault Detection and Isolation Unit
A power system fault detection and isolation unit is an autonomous protection assembly that uses radiation-hardened solid-state power controllers, current-limiting circuits, and comparator logic to detect and isolate short circuits, overloads, and electrical arcs before they damage healthy bus equipment. Operating on the Moon complicates power protection because the vacuum environment alters arc characteristics compared to atmospheric conditions, while radiation exposure induces semiconductor latchup and single-event burnout in power MOSFETs. To safeguard power distribution across a 100-year lifespan without human intervention, the unit executes autonomous fault isolation and relies on integrated self-testing protection circuits.
Fault detection and isolation system protecting power bus from shorts, overloads, and arc faults
Purpose
Detect and isolate power system faults before they propagate and damage healthy equipment
Context
Child of L2-PWR-CONV within the Lunar Ark power generation system
Principles
- ▸Current-limiting circuits prevent fault propagation through power bus
- ▸Arc fault detection identifies and interrupts dangerous electrical arcs
- ▸Undervoltage and overvoltage protection prevents operation outside safe limits
- ▸Autonomous fault isolation requires no human intervention for time-critical responses
Typical implementations
- ▸Solid-state power controllers (SSPC) replacing mechanical breakers in aircraft/spacecraft
- ▸ISS Remote Power Controller Module (RPCM) for load switching and protection
- ▸DDC (Data Device Corporation) space-grade SSPCs
- ▸Texas Instruments fault protection ICs for space applications
Lunar considerations
- ▸Vacuum environment means different arc characteristics than atmospheric
- ▸Radiation-induced latchup in power semiconductors can create internal faults
- ▸Single-event burnout of power MOSFETs must be detected and mitigated
- ▸100-year autonomous operation requires self-testing protection circuits
Specifications
Functional
| primary function | Fault detection and isolation system protecting power bus from shorts, overloads, and arc faults |
Physical
| materials | Rad-hard SSPCs, Current sense resistors, Comparator ICs, Rad-hard logic |
Interfaces
Provides
- Protected and isolated power bus segments
Requires
- Fault response commands and load priority tables
Cite this entry
Lunar Ark Codex. "Power Fault Protection" (L3-PWR-CONV-PROT). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-PWR-CONV-PROT
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.