16 -- 270 VDC POWER CONVERTER

Notice Date

March 29, 2001

Contracting Office

U.S. Army Engineer District, Norfolk, Attn: CENAO-SS-C, 803 Front Street, Norfolk, Virginia 23510-1096

ZIP Code

23510-1096

Response Due

April 13, 2001

Point of Contact

Debbie Gray, 757-441-7551

E-Mail Address

Debbie Gray (debora.s.gray@usace.army.mil)

Description

The U.S. Army Corps of Engineers, Norfolk District is conducting a market survey to identify sources and increase competition acquisition opportunities for a VDC Power Converter. The following is the specifications for this Converter. GENERAL: Testing: Units must have been tested and approved on Lockheed Martin's test platform at Ft Worth TX and/or on an actual F-22 aircraft. Units must have been in use for a minimum of 1 year. Configuration: The 270 -VDC power supply shall be an all-solid state AC to DC converter that utilizes the latest technology for the generation and control of the 270 -- VDC power output. The power supply shall utilize methods to obtain high efficiency of 90% or better. The DC control system shall be precisely controlled to better than + or -- 1% from no load to full load. The power supply shall include input switchgear and protection circuits, controls, monitors, alarms and front panel indicators necessary to perform as specified herein. A) Provide 270 -- volt DC solid state DC power supply consisting of modular construction solid state components for the conversion of 60 Hz rated 480 -- volt three phase supply voltage to 270 -- volts DC with characteristics and features as described herein. Provide power supply in an enclosure designed for indoor environment in a class 1, division 2 environment in accordance with NEMA 250 type 12. Provide enclosure with 18 inch floor stand kit to insure no electrical connections are permitted in the area occupied by the 18 inch floor stand. Arrange to provide required louvers, cooling air, entry and exit provisions for equipment within the enclosure. Unit shall be designed to be front access only so that necessary adjustments, parts replacement and controls be accessed though the front door of the cabinet. Cabinet door shall have locking handle with all matching keys. The enclosure dimensions shall not exceed -- height 72 inches, width 36 inches, and depth 36 inches. The cabinet shall accommodate input conductors at the top and the output terminals located near the bottom to accommodate the output cables from either side. B) Construct units such that all components with the exception of the controls and monitoring components are totally enclosed within the enclosure. Locate all control and monitoring components on the front access door of the unit. Identify all interior components with permanent labels that agree with circuit designators on the schematics and assembly drawings. All wiring must be color-coded to match the designations indicated on the circuit schematic wiring diagram. All internal circuit cards shall be protected from defects of humidity and corrosion to comply with MIL- I-46058C, type UR, MIL-C 47175A and MIL T-152B. C) All internal chassis, brackets, equipment panels shall comply with MIL-C5541A, MIL-C-81706 and MIL C-5541C. Each compartment of the enclosure shall be equipped with an environmentally safe, vapor type, corrosion inhibitor module design to protect the installed components against the effects of salt, high humidity and air type corrosions. All interior hardware shall be stainless steel and Belleville type spring washers and be used on all power connections. Cabinet shall be finished in tough, two part polyurethane enamel over the finished manufacture's recommended finished coating. ELECTRICAL CHARACTERISTICS: Input voltage -- Plus or minus 10 % of nominal 480 volts, (432 volts to 528 volts) three phase, 60Hz. Input Frequency -- Converter shall operate within 45 to 65Hz. Input phase rotation -The AC to DC converter shall operate within specifications on any incoming phase rotation. No damage shall occur as a result of connecting either rotation to the converter input terminals. Input surge protection -- Converter shall be equipped with input surge protection connected to Line to line to ground to protect the solid state components from damaging transient voltages. Any power semi conductors shall be equipped with individual voltage suppression devices to protect the components against damaging voltage transients. Power Factor -- Shall be .9 or better. Inrush Current and Load Characteristics -- Converter shall be equipped with soft charging circuit for internal DC bus to limit inrush amps too less than full load input amps of the converter. Soft start shall automatically charge the DC Bus on turn ON. Output current rating -- converters shall be equipped with four outputs as follows: A) 270 amps (73 Kw) at 270 -- VDC (Main power), B) 30amps ( 8.1Kw) at 270 -- VDC (Auxiliary power), C) 30 amp power supply with (2) 15 amps (.84Kw) at 28 -- VDC outputs (Interlock power- Time delay-adjustable- minimum of 1 second to the 270VDC contactor ). Output Current Rating -- Loads are one ohm resistive: 1,000 ufd of capacitance and inductance load of 20% and must respond to instantaneous load changes (pulse loads asynchronous). Inrush currents may be as high as 2,000 amps. Nominal output voltage rating -- Converter output voltages shall be 270 VDC nominal for main and auxiliary power and 28 VDC nominal for interlock power. 270VDC regulation (Steady state) -- 270 VDC + or- 1% no load to full load. Steady state controlled voltage range to meet or exceed from 267.3 to 272.7 VDC. Output voltage ripple amplitude -- Output voltage ripple amplitude for the 270 amp, 100 amp and the 30 amp 270 VDC outputs shall be less than 1 volts peak to peak from no load to full load. Output ripple amplitude for the ( 30 amp )- 28 VDC interlock power supply shall be less than 500 millivolts peak to peak from no load to full load. Environmental rating -- Ambient temperatures ranging from 0 degrees C to 50 degrees Relative humidity from 0 to 95% non -- condensing. Ambient pressures from sea level to 4, 000 feet. Controls: A) Line side circuit breaker with shunt trip coil interlocked with converters output fault alarms to the output contractors. B) Converter Start and stop / reset pushbuttons with clear safety lift covers. C) Separate 270 amp and 30 amp output contactor ON/ Off pushbuttons. D) Output voltage adjustment pot for the 270 VDC power supply. E) Fault reset buttons. F) Lamp test button. Indicators: A) Input power ON. ( amber color ) B) 270 -- VDC converter ON. ( green color ), C)270 -- VDC 270 amp contactor closed & 270 VDC 30 amp contactor closed. ( Green color), D) 270 -- VDC output over current fault ( red color ), E) 270 -VDC output overvoltage fault ( red color), F) 270 -VDC output undervoltage fault (red color), G) 28 -- VDC converter ON ( green color), H) 28 -- VDC interlock for 270 amp contactor enable ( Blue color), I) 28 -- VDC interlock for 30 amp contactor enable ( Blue color), J) DC storage bus charged. ( Green color ). Instrumentation: A) Output digital DC voltmeter scaled to 500 volts. ( 270 -- VDC system), B) Output digital DC voltmeter scaled to 100 volts. ( 28 -- VDC system), C) Input digital AC voltmeter 3 phase with selector switch, scaled to 600 volts Line to Line, D) Output digital Ammeter scaled to 500 amps. (270 -- VDC system ), E) Output digital Ammeter scaled up to 100 amps. (28 -- VDC system ), F) Elapsed time indicator with 0 to 99,999.9 hour range (non resetable ). Input output Devices: Line side circuit breaker with shunt trip coil interlocked with converters output fault alarm. Breaker shall be equipped with a cabinet flange mounted operating handle interlocked with front access door. The main 270 VDC and auxiliary output power contactor shall be interlocked with the system's alarms and 28 VDC interlock power circuit. The main contactor shall be rated at 270 amps. Auxiliary 270 VDC output power contactor interlock with the systems alarms and 28 VDC interlock power circuit. Contactor shall be rated at 30 amps. Bus Bleeder Circuit: The converter shall be equipped with a bus bleeder circuit capable of discharging the main DC bus. The main bus must be bled down to a value below 12 volts Dc in less than 10 seconds after the converter has been turned off or upon the detection of a system fault. The system shall designed to operate virtually instantaneously upon receiving a stop command or fault shut down. Transient Voltage Recovery Time: A) 0% to 50% load step Voltage dip > 235 V with recovery time of 15 milliseconds, B) 50% to 0% load step Voltage rise < 300 V with recovery time of 15 milliseconds, C) 0% to 75% load step Voltage dip > 235 V with recovery time of 15 milliseconds, D) 75% to 0% load step Voltage rise < 300 V with recovery time of 15 milliseconds, E) 0% to 100 load step Voltage dip > 235 V with recovery time of 15 milliseconds, F) 100% to 0% load step Voltage rise < 300 V with recovery time of 15 milliseconds. Distortion Spectrum / Factor: Distortion spectrum shall meet requirements of MIL -STD 704 E as indicated in figure 13 and distortion factor shall meet MIL -STD 704 E, table 11 for 270 VDC power output. The distortion factor shall be less than 1.5%. Electronic Line Drop Compensation ( ELDC): Equip converter with a Line Voltage Drop Compensation Circuit on the main output buss adjustable from 0% to 5% of the nominal 270 VDC output. The ELDC shall be able to effectively control the voltage at the point remote from the converter and effectively canceling out the voltage drop on the 120 ft output cable. Alarms: Provide main power output with an adjustable electronic overload alarm with inverse time operating characteristics. Alarm pot shall be mounted inside the converter. Provide the power supply with instantaneous acting short circuit alarm factory set to trip the converter off line between 210% and 250 % of rated output current. It is for INFORMATION ONLY and is NOT a Request For Proposal or announcement of a solicitation. Responses should briefly address projects similar in scope and dollar threshold and should be addressed to Debbie Gray, U.S. Army Engineer District, Norfolk 803 Front Street, ATTN: CENAO-SS-C, Norfolk, VA 23510-1096 no later than April 13, 2001.

Record

Loren Data Corp. 20010402/16SOL015.HTM (W-088 SN50H6I6)