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  • 1
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    Power subsystem automation study (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Generic power-system elements and their potential faults are identified. Automation functions and their resulting benefits are defined and automation functions between power subsystem, central spacecraft computer, and ground flight-support personnel are partitioned. All automation activities were categorized as data handling, monitoring, routine control, fault handling, planning and operations, or anomaly handling. Incorporation of all these classes of tasks, except for anomaly handling, in power subsystem hardware and software was concluded to be mandatory to meet the design and operational requirements of the space station. The key drivers are long mission lifetime, modular growth, high-performance flexibility, a need to accommodate different electrical user-load equipment, onorbit assembly/maintenance/servicing, and potentially large number of power subsystem components. A significant effort in algorithm development and validation is essential in meeting the 1987 technology readiness date for the space station.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-170974 , NAS 1.26:170974 , MCR-83-645
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of single-cell protectors for sealed silver-zinc cells (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three design approaches to cell-level protection were developed, fabricated, and tested. These systems are referred to as the single-cell protector (SCP), multiplexed-cell protector(MCP). To evaluate the systems 18-cell battery packs without cell level control were subjected to cycle life test. A total of five batteries were subjected to simulate synchronous orbit cycling at 40% depth of discharge at 22C. Batteries without cell-level protection failed between 345 and 255 cycles. Cell failure in the cell level protected batteries occurred between 412 and 540. It was determined that the cell-level monitoring and protection is necessary to attain the long cycle life of a AgZn battery. The best method of providing control and protection of the AgZn cells depends on the specific application and capability of the user.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159407 , MCR-78-571
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Definition study for photovoltaic residential prototype system (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A parametric sensitivity study and definition of the conceptual design is presented. A computer program containing the solar irradiance, solar array, and energy balance models was developed to determine the sensitivities of solar insolation and the corresponding solar array output at five sites selected for this study as well as the performance of several solar array/battery systems. A baseline electrical configuration was chosen, and three design options were recommended. The study indicates that the most sensitive parameters are the solar insolation and the inverter efficiency. The baseline PST selected is comprised of a 133 sg m solar array, 250 ampere hour battery, one to three inverters, and a full shunt regulator to limit the upper solar array voltage. A minicomputer controlled system is recommended to provide the overall control, display, and data acquisition requirements. Architectural renderings of two photovoltaic residential concepts, one above ground and the other underground, are presented. The institutional problems were defined in the areas of legal liabilities during and after installation of the PST, labor practices, building restrictions and architectural guides, and land use.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135056 , MCR-76-394 , ERDA/NASA-19768
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of single cell protectors for sealed silver-zinc cells, phase 1 (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A single cell protector (SCP) assembly capable of protecting a single silver-zinc (Ag Zn) battery cell was designed, fabricated, and tested. The SCP provides cell-level protection against overcharge and overdischarge by a bypass circuit. The bypass circuit consists of a magnetic-latching relay that is controlled by the high and low-voltage limit comparators. Although designed specifically for secondary Ag-Zn cells, the SCP is flexible enough to be adapted to other rechargeable cells. Eighteen SCPs were used in life testing of an 18-cell battery. The cells were sealed Ag-Zn system with inorganic separators. For comparison, another 18-cell battery was subjected to identical life test conditions, but with battery-level protection rather than cell-level. An alternative approach to the SCP design in the form of a microprocessor-based system was conceptually designed. The comparison of SCP and microprocessor approaches is also presented and a preferred approach for Ag-Zn battery protection is discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135054 , MCR-76-263
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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