1、AMSC N/A FSC 5950 INCH-POUND MIL-PRF-27/25C 28 April 2008 SUPERSEDING MIL-PRF-27/25B 8 April 1992 PERFORMANCE SPECIFICATION SHEET TRANSFORMERS, POWER, STEP DOWN, 3-PHASE This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquir
2、ing the product described herein shall consist of this specification sheet and MIL-PRF-27. FIGURE 1. Dimensions and configuration. Inches mm .015 .125 .178 .183 .250 .313 .562 .625 1.125 1.750 2.750 3.000 4.625 5.125 0.38 3.18 4.52 4.65 6.35 7.95 14.27 15.88 28.58 44.45 69.85 76.20 117.48 130.18 Ina
3、ctive for New Design after 23 May 1997Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/25C 2 CIRCUIT DIAGRAM NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, to
4、lerance is .030 (0.76 mm) for two place decimals. 4. Marking: Type designation, military part number, manufacturers name or code symbol, circuit diagram, rated voltage and frequency of primary, rated voltages and currents of secondaries, working voltage and date code to be marked in the space specif
5、ied on figure 1. FIGURE 1. Dimensions and configurations - Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/25C 3 REQUIREMENTS: Electrical ratings: Primary voltage 1, 2, 3, and 12 neutral, 115 volts rms line neutral, 3 phase, 400
6、 Hz 20 Hz. Secondary voltage: (4-5) (5-6) (6-4): 42 volts rms, 0.9 amperes, line to line, wye connected. (7-8) (8-9) (9-7): 42 volts rms, 0.9 amperes, line to line, wye connected. Working voltage: 175 volts maximum. Design, configuration, and physical dimensions: See figure 1. Duty cycle: Continuous
7、. Case: Material: Metal, hermetically sealed. Terminals: Twelve solderable turret type capable of accepting a minimum of two number 18 AWG wires. Height: .312 inch maximum. Weight: 3 pounds maximum. Dielectric withstanding voltage (at sea level): Method 301 of MIL-STD-202; test voltage 500 volts rms
8、. Electrical characteristics: No load: With 115 volts, 400 Hz 20 Hz across terminals (12-1), (12-2), (12-3). Current 0.1 ampere maximum per phase; voltage across (4-5), (5-6), (6-4), (7-8), (8-9), (9-7) shall be 42 volts rms 1 percent, respectively. Rated load: With 115 volts, 400 Hz across (1-12),
9、(2-12), (3-12), voltage across (4-5), (5-6), (6-4), (7-8), (8-9), (9-7) shall be 42 volts rms +1 percent, -3 percent at 0.9 amperes per secondary leg. Regulation: The output voltage of secondary windings (4-5), (5-6), (6-4), (7-8), (8-9), (9-7) shall not vary more than 3 percent with load reduced fr
10、om 0.90 amperes to 0.10 amperes. Electrostatic shielding: Electrically and mechanically connected to terminal 10. Temperature rise: Not more than 65C when operated at 0.90 amperes per secondary leg. Ambient temperature: -28C to +65C. Quality assurance provisions: Retention of qualification: Not appl
11、icable for this specification sheet. Quality conformance inspection: Groups A and B tests of MIL-PRF-27 shall be applicable. Marking location: See figure 1. Part or Identifying Number (PIN): M27/25-1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
12、IL-PRF-27/25C 4 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. B
13、idders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Referenced documents. In addition to MIL-PRF-27, this document references the following: MIL-STD-202 Cust
14、odians: Preparing activity: Army - CR DLA - CC Navy - EC Air force 11 DLA CC (Project: 5950-2008-004) Review activities: Army AR, MI Navy AS, MC, SH Air Force 19 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of this information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
