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NASA-LLIS-4057
Lessons Learned - Spacecraft Single Phase AC Electrical Powerlants
Year: 2011
Abstract: Abstract:
When single-phase power is pulled from a 3-phase supply (e.g., for Orbiter lighting) that is feeding critical 3-phase motors, there is a resulting phase imbalance (especially neutral leg current) that can disrupt instrumentation that is monitoring the health of other equipment. This instrumentation monitors the current draw of the motor (or an associated load such as a fluid pump) to sense motor loading that may indicate when a bearing is wearing out, a pump is stalling, or there are short or open circuits. Whenever possible, dedicated 3-phase power should be provided to critical rotary equipment to alleviate this problem.
When single-phase power is pulled from a 3-phase supply (e.g., for Orbiter lighting) that is feeding critical 3-phase motors, there is a resulting phase imbalance (especially neutral leg current) that can disrupt instrumentation that is monitoring the health of other equipment. This instrumentation monitors the current draw of the motor (or an associated load such as a fluid pump) to sense motor loading that may indicate when a bearing is wearing out, a pump is stalling, or there are short or open circuits. Whenever possible, dedicated 3-phase power should be provided to critical rotary equipment to alleviate this problem.
Subject: Crew Survival Systems
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:39:19Z | |
| date available | 2017-09-04T15:39:19Z | |
| date copyright | 07/22/2011 | |
| date issued | 2011 | |
| identifier other | PAQDNEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/41428 | |
| description abstract | Abstract: When single-phase power is pulled from a 3-phase supply (e.g., for Orbiter lighting) that is feeding critical 3-phase motors, there is a resulting phase imbalance (especially neutral leg current) that can disrupt instrumentation that is monitoring the health of other equipment. This instrumentation monitors the current draw of the motor (or an associated load such as a fluid pump) to sense motor loading that may indicate when a bearing is wearing out, a pump is stalling, or there are short or open circuits. Whenever possible, dedicated 3-phase power should be provided to critical rotary equipment to alleviate this problem. | |
| language | English | |
| title | NASA-LLIS-4057 | num |
| title | Lessons Learned - Spacecraft Single Phase AC Electrical Powerlants | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2011 | |
| contenttype | fulltext | |
| subject keywords | Crew Survival Systems | |
| subject keywords | Engineering design and project processes and standards | |
| subject keywords | Lander Systems | |
| subject keywords | Level II/III requirements definition | |
| subject keywords | Mission and systems trade studies | |
| subject keywords | Orbiting Vehicles | |
| subject keywords | Reliability | |
| subject keywords | Test & Verification | |
| subject keywords | Vehicle concepts |