1、AMSC N/A FSC 5950 MIL-PRF-27/187D 18 July 2008 SUPERSEDING MIL-T-27/187C 2 June 2003 MILITARY SPECIFICATION SHEET TRANSFORMER, POWER, STEP-DOWN, AUTOTRANSFORMER This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquiring the p
2、roducts described herein shall consist of this specification and MIL-PRF-27. FIGURE 1. Dimensions and configurations. INCH-POUNDInactive for new design after 13 March 1991 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/187D 2 ALTITUDE = 8
3、0,000 FT MAX Inches mm Inches mm Inches mm .005 .031 .100 .164 .190 .20 .251 0.13 0.79 2.54 4.17 4.83 5.1 6.38 .28 .31 .37 .38 .437 .593 .770 7.1 7.9 9.4 9.7 11.10 15.06 19.56 .875 1.187 1.53 1.562 1.69 2.270 22.22 30.15 38.9 41.96 42.9 57.69 NOTES: 1.Dimensions are in inches. 2.Metric equivalents a
4、re given for general information only. 3.Unless otherwise specified, tolerances are .010 (0.25 mm) for three place dimensions and .03 (0.8 mm) for two place dimensions. 4.Marking shall be on the top of the case. 5.Stud shoulder shall form an integral part of the threaded stud terminal. FIGURE 1. Dim
5、ensions and configurations - Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/187D 3 REQUIREMENTS: (When designations or colors in parentheses, i.e., (COM-HV) (BLK-WHT) are used, they indicate the winding and the extreme terminal
6、s of the winding.) Electrical ratings: Primary (COM-HV): 173 volts ampere, 115 volts rms, 400 hertz. Secondary (BLK-WHT): 12.5 volts rms, 11.2 amperes rms. Working voltage: (COM-HV): 179 volts maximum. (BLK-WHT): 20 volts maximum. DC resistance: At ambient temperature of +20C. (BLK-WHT): 0.057 ohm 1
7、5 percent. (WHT-HV): 1.45 ohms 15 percent. Design and construction: Dimensions and configuration: See figure 1. Duty cycle: Continuous. Case: Diallyl phthalate (ASTM D 5948-96). Weight: 0.820 pound maximum. Terminal type: Primary: Corrosion-resistant steel, threaded integral shoulder-stud. Secondary
8、: Number 18 AWG insulated lead wire in accordance with MIL-DTL-16878, type EE. Terminal height: Primary: See figure 1. Terminal length: Secondary: 16 1 inch. Altitude: 80,000 feet maximum. Operating temperature range: -54C to +170C. Operating temperature: +170C maximum. Insulating materials: Magnet
9、wire insulation: Modified polyester base, polyamide-imide overcoat, +200C. Encapsulating material: Epoxy, +170C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/187D 4 Paper: Aramid, +220C. Tape: Backings: Polyamide film, glass cloth, aram
10、id paper, +220C. Adhesive: Silicone, +180C. Bobbin: Aramid, +220C. Housing: Diallyl phthalate, +180C. Terminal strength: MIL-STD-202, method 211, test condition A, 5 pounds. Vibration, high frequency: MIL-STD-202, method 204, test condition D. Salt spray (corrosion): MIL-STD-202, method 101, test co
11、ndition B. Dielectric withstanding voltage: At sea level: 500 volts rms. At barometric pressure: 300 volts rms. Electrical characteristics: No load: With 115 volts rms, 400 hertz across (COM-HV). Current in (COM-HV): 150 milliamperes maximum. Power in (COM-HV): 2.9 watts maximum. Voltage across (BLK
12、-WHT): 13.7 volts rms 2 percent. Rated load: With 115 volts rms, 400 hertz across (COM-HV). Voltage across (BLK-WHT): 12.5 -0, +0.4 volts rms at an ambient temperature of +70C. Voltage across (BLK-WHT): 12.5 -0, +0.7 volts rms at an ambient temperature of +25C. Temperature rise: +100C with 115 volts
13、 rms, 400 hertz across (COM-HV) at an ambient temperature of +70C. Voltage regulation: 10 percent maximum. VERIFICATION: Qualification inspection: Not applicable. Quality conformance inspection: Groups A and B tests of MIL-PRF-27 shall be applicable. Marking location: See figure 1. Part or Identifyi
14、ng Number (PIN): M27/187-01. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/187D 5 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made.
15、This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to t
16、he last previous issue. Referenced documents. In addition to MIL-PRF-27, this document references the following: MIL-STD-202 MIL-DTL-16878 ASTM D 5948-96 NASM 15795 NASM 21043 Custodians: Preparing activity: Army CR DLA CC Navy EC Air Force 11 (Project 5950-2008-023) DLA - CC Review activities: Army
17、 AR, CR4, MI Navy AS, MC, OS, SH Air Force 19, 99 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-,-,-
