SOLICITATION NOTICE
59 -- 100 KW ELECTRIC PROPULSION POWER SUPPLY
- Notice Date
- 11/24/2003
- Notice Type
- Solicitation Notice
- Contracting Office
- NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812
- ZIP Code
- 35812
- Solicitation Number
- 4200035680
- Response Due
- 12/9/2003
- Archive Date
- 11/24/2004
- Point of Contact
- Cynthia B. Hollingsworth, Contracting Officer, Phone (256) 544-1656, Fax (256) 544-6062, Email cynthia.hollingsworth@msfc.nasa.gov - Marlyce E. Alexander, Contract Specialist, Phone (256) 544-8344, Fax (256) 544-6062, Email marlyce.alexander@msfc.nasa.gov
- E-Mail Address
-
Email your questions to Cynthia B. Hollingsworth
(cynthia.hollingsworth@msfc.nasa.gov)
- Description
- NASA/MSFC has a requirement for one (1) 112kJ/sec., 40kV, non-instrumented power supply system. NASA/MSFC intends to purchase the power supply system from General Atomics Energy Products on a sole source basis. The power supply charges a repetitively discharged pulsed plasma thruster to a specified voltage within a specified period of time. The unit is operated remotely through a fiber optic remote interface. The power supply is designed for limited duty cycle charging to 40kV in 90msec, operating at 10Hz for an on period of two minutes maximum with a minimum off period of one hour. The power supply is composed of seven units connected together to form a single power supply, in a single Hoffman cabinet. These power supplies have dual, parallel output connectors so that parallel supplies can be configured in a daisy chain configuration. The reasons supporting the JUSTIFICATION FOR OTHER THAN FULL AND OPEN COMPETITION are as follows: 1. The primary justification is related to compatibility. This purchase is intended to upgrade and augment an existing system. We presently possess three units (which were acquired from General Atomics, Energy Products). As described above, the General Atomics power supplies can be daisy chained together to increase the total output power. To accomplish this, the individual power supplies must communicate with one another to balance their loading. The General Atomics units use a commercial proprietary interface to accomplish this communication, so power supplies obtained from another source will be incompatible with our existing investment, thus limiting our testing capabilities. 2. Failure of the power supply (due to incompatibility) with our existing equipment could result in the explosive release of up to 50 kJ of capacitively stored energy. This could cause significant damage to costly test equipment that will be co-located with the power supply. 3. General Atomics Energy Products is the manufacturer of the capacitors to be used in the experiment. The power supply described above is specifically designed to charge those capacitors. The supplies use quasi-resonant circuitry to ramp the charge current; the details of the circuitry are specific to our capacitive load. 1.0 PRODUCT DESCRIPTION The power supply charges a specified load in the application, to a specified voltage within a specified period of time. The unit is operated remotely through a fiber optic remote interface. These power supplies are part of a system profiled on Proposal No.: 12-0330. These power supplies are designed for limited duty cycle charging to 40kV in 90msec, operating at 10Hz for an on period of two minutes maximum with a minimum off period of one hour. These power supplies have dual, parallel output connectors so that parallel supplies can be configured in a daisy chain configuration. The approximate size of this power supply is a standard 19 rack mount, 8.75 (5U) tall and approximately 20 deep. 2.0 ELECTRICAL SPECIFICATIONS 2.1 Primary Input Power. The power supply is specified to operate from one level of input voltage. The ac input voltage shall be 480VAC, +10%, -10%, three phase, 50/60Hz. The average input current per phase is 26A/phase. This power supply has no circuit breaker. This shall be a five-wire WYE input consisting of the three phase inputs, neutral and safety ground. 2.2 Input Leakage Current. The AC leakage current shall be 5mA. 2.3 Efficiency. The power supply shall have an efficiency of 90%. 2.4 Primary Input Power Surge Current. The peak in rush input current shall be less than the peak operating input current of the power supply. 2.5 Maximum Output Voltage. The maximum output voltage shall be 40kV. 2.6 Output Voltage Regulation. The output voltage regulation shall be 0.5% of the maximum output voltage. 2.7 Output Power. The specification for output power of the power supply is 16kJ/sec average power at the full-specified input voltage. The application charge time is 90 milli seconds @ 10Hz with a limited Duty Cycle as described above. 2.8 Remote Output Voltage Programming. The desired output voltage shall be set by the voltage signal provided to the fiber optic remote programming input. 2.9 Output Voltage Polarity. The output voltage polarity shall be positive. The center conductor of the high voltage output cable positive with reference to the shield of the high voltage output cable. The shield shall be connected to the chassis of the power supply. 2.10 Output Short-Circuit Protection. The power supply shall have internal protection to detect a load short-circuit condition. Once detected, the charging cycle is terminated. To restore charging, the high voltage must be turned OFF and then turned ON via the Enable input signal on the fiber optic remote control. 2.11 External Safety Interlock. The power supply shall have an external safety interlock input signal located on the rear panel. This signal shall break the internal +24VDC 15% which is used to power all internal logic and control circuitry. The powered side of this interface is protected by a positive temperature co-efficient (PTC) resistor so that the connections are self-protected against short circuit connections to the chassis. An open circuit between these two inputs disables the power supply by removing all low voltage power from internal logic and control circuitry. The power supply is enabled by connecting these inputs together with a voltage free contact closure capable of conducting 50mA. External safety interlock inputs from multiple power supplies cannot be connected together. Each power supply requires a separate voltage free contact closure. 2.12 Fiber-Optic Remote Controls. The power supply shall have the following fiber-optic remote controls and monitoring functions. These functions are available through fiber connectors located on the rear panel. The fiber-optic interface signals are: a. Serial clock input signal. b. Serial data input signal. c. Sync input signal. d. Inhibit input signal. e. Enable input signal. f. Interlock indicator output signal. g. Load fault indicator output signal. h. Over-temperature indicator output signal. 2.13 Front Panel Status Indicators. The power supply shall have the following front panel status indicator lamps for monitoring the power supply status. The status indicator lamps are: 1) Interlock 2) Over Voltage 3) Over Current 4) Over Temp 5) Internal Fault 3.0 ENVIRONMENTAL SPECIFICATIONS 3.1 Storage Temperature. The storage temperature range shall be from -30ac to +85ac. 3.2 Operating Temperature. The operating temperature range shall be from 0ac to 45ac. 3.3 Relative Humidity. The operating relative humidity shall be from 10% to 90% non-condensing. 3.4 Weight. The weight of the unit shall be approximately 70lbs. 4.0 ELECTRICAL STANDARDS 4.1 Electrical Standards. The power supplies will be designed to meet the requirements of IEC 61010, NFPA 79, IEC 60950, and IEC 60204-1 using UL approved parts. The Government intends to acquire a commercial item using FAR Part 12. Interested organizations may submit their capabilities and qualifications to perform the effort in writing to Janet Appleton, at janet.appleton@msfc.nasa.gov no later than 4:30 p.m. local time on 12/9/2003. Such capabilities/qualifications will be evaluated solely for the purpose of determining whether or not to conduct this procurement on a competitive basis. A determination by the Government not to compete this proposed effort on a full and open competition basis, based upon responses to this notice, is solely within the discretion of the government. All responsible sources may submit an offer which shall be considered by the agency.
- Web Link
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- Record
- SN00476160-W 20031126/031124212438 (fbodaily.com)
- Source
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