US Department of Commerce/National Oceanic and Atmospheric Administration, 1325 East West Highway - Station 4301, OA312:RRC, Silver Spring, Maryland 20910-3283

61 -- NON-DEVELOPMENTAL ITEM/UNINTERRUPTIBLE POWER SOURCE DUE 010596 POC Robert R. Curtis, Contract Specialist; 301/713-0823 The Government intends to procure approximately 160 (130 single thread systems and 30 dual thread systems) Non-Development Item (NDI) Uninterruptible Power Systems (UPS) for its National Weather Service/Tri-Agency Doppler Weather Surveillance Radar - 1988 (WSR-88D) systems. Due to remote locations, temperature extremes, and perceived reduced costs, the Government intends to procure a UPS product that does not use energy storage batteries. Environmental conditions for energy storage batteries cannot be ensured and routine servicing cannot be guarenteed during the winter season. Based on preliminary market research, the NWS is concerned that these two factors, coupled with cost considerations, preclude the use of energy storage batteries. The WSR-88D radar system is a complex power load not commonly found in industry. The WSR-88D's existing power source is a commercial utility grade 75 KVA, 5.75% per unit impedance transformer supplying 208 Volt, 3-phase, 4-wire, 60 Hertz input power with backup power furnished by a Kohler emergency standby diesel generator, model number 80ROZJ81, rated for 80 KVA. The system load consists of WSR-88D support electronics requiring UPS protection, including a Westinghouse 750 KW peak power pulsed klystron transmitter, two 90 Amp DC servo drive motors moving an 11-ton antenna, and two 5-ton Bard air conditioners. The Bard air conditioners do not require UPS protection. Kohler recommendations for the generator to UPS size ratio must be greater than 1.6 for UPS units using 6-pulse front end rectifiers and greater than 1.4 for UPS units using 12-pulse front end rectifiers. Respondents should address the compatibility of the UPS being proposed to the existing Kohler generator. The available installation space is limited to an 11 feet by 8 feet by 8 feet high room, including space for controls, enclosures, and maintenance in an insulated shelter with 4-foot wide access doors. The UPS must supply a continuous load of 208 +/- 5% Volts, 3-phase, 4-wire, 60 +/- 5% hertz, of at least 25 KVA for single thread systems and 32 KVA for dual thread systems at 0.8 power fator, at an outdoor temperature of -40 degrees C to +49 degrees C, without derating, from mean sea level (MSL) to 3300 meters above MSL. Ride-through, at continuous load, must be at least 12 seconds, up to 40 events per day, with no degradation of voltage or frequency. The UPS must be capable of supplying overload currents of at least 600% of the continuous load for 16.7 milliseconds and 150% of the continuous load for 30 seconds, without the use of bypass mode. The voltage dip, during the transient period, caused by the application of a 0.4 power factor lagging load drawing 200% of the UPS's rated current, shall not exceed 5% of the UPS's rated voltage. The output voltage waveforms shall not to exceed 3% THD at continuous load, with 50% of the load being nonlinear and no single harmonic more than 1% of fundamental frequency, from 60 hertz to 1 megahertz. The output direct-axis subtransient reactance (X''d) must be 0.2 per unit (pu), maximum and the direct-axis transient short-circuit time constant test (T'd) must be 0.5 seconds, minimum. The UPS inputs and outputs shall be protected to withstand, without damage, IEEE C62.41 Category C (exposed outdoor feeders) waveforms. Interested parties should address the single thread requirements and the dual thread requirements separately unless a single unit is contemplated for both requirements. Respondents should include product data, quantity pricing, and available options. Any additional design considerations, such as modifications to the existing NDI product design, HVAC requirements, required personnel safety equipment, and modifications to the existing Government equipment described above should be included with the product data. The Government seeks available product information including: product references; conformance to specific industry and military standards, specifications, certifications and listings; quality assurance program participation; reliability and maintainability programs; warranty provisions available to the Government; maturity of product design; number of years in production, and number and description of units currently in service in both commercial and Government applications. The Government also seeks available product information for logistics support; life cycle cost analysis (based on a 20 year service life); automated Logistics Support Analysis Record (LSAR) capabilities; spares list, special tools, support equipment operations and maintenance manuals, training capabilities, training materials, and their associated pricing. Proprietary information should be specifically marked by paragraph and will be protected by the Government. All parties interested should send their response to the point of contact and address cited above. While written responses are required, interested parties may contact the above cited point of contact by telephone should further clarification be required. (0353)

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