1、I INCH-POUND I 16 June 2000 SUPERSEDING 05 April 1961 MIL-DTL-265 17B MIL-P-26517A (USAF) DETAIL SPECIFICATION POWER SUPPLY, TRANSFORMER-RECTIFIER, AIRCRAFT GENERAL SPECIFICATION FOR MIL-DTL-26517B remains inactive for new design and is no longer used, except for replacement purposes. This specifica
2、tion is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers general requirements for power supplies that convert power from a nominal 1 W200 V, 400 Hz, altemating-current (AC) aircraft electrical system to direct-current power. 1.2 Cl
3、assification. The power supplies will be of the following types and classes as specified (see 6.2): TYPE STYLE DESCRIPTION Type 1 Regulated Contains provisions for regulated output voltage and parallel operation Type II Non-regulated Does not contain provisions for regulated output voltage and will
4、depend on the inherent characteristics of the power conversion elements to maintain voltage and provide paralleling within the specified limits CLASS Class A Class B Class C DESCRIPTION Power supplies, which are self-cooled and designed to meet the altitude- temperature requirements of Figure 1, cur
5、ve II or industry equivalent. Power supplies which are self-cooled and designed to meet the altitude- temperature requirements of Figure 1, curve I or industry equivalent, except that the temperature at sea level will be 125“ C. Power supplies which are forced-air cooled and designed to meet the alt
6、itude-temperature requirements of Figure 1, curve I or industry equivalent, except that the temperature at sea level will be 125“ C. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: WR-ALCRILCC,
7、420 Second Street Suite 100, Robins AFB, GA 31098-1640 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or bv letter. AMSC N/A FSC 6130 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
8、-DTL-265 17B 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every
9、effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbook
10、s. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index for Specifications and Standards (DODISS) and supplement t
11、hereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL QQ-P-416 Plating, Cadmium (Electrodeposited) DEPARTMENT OF DEFENSE DOD-D-1000 Drawings, Engineering and Associated Lists MIL-S-7742 Screw Threads, Standard, Optimum Selected Series, General Specification for MIL-“7969 Motor, Alterna
12、ting Current, 400-Cycle, 1 W200-Volt System, Aircraft, General Specification for MIL-A-8625 Anodic Coatings for Aluminum and Aluminum Alloys STANDARDS DEPARTMENT OF DEFENSE MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-461 Requirements for the Control of Electromagnetic Interf
13、erence Characteristics of Subsystems and Equipment MIL-STD-704 Aircraft Electric Power Characteristics MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests, Test Method Standard for MIL-STD-889 Dissimilar Metals (Unless otherwise indicated, copies of the above specifications, st
14、andards, and handbooks are available from the Defense Automated Printing Service (DAPS), 700 Robbins Ave, Building 4D, Philadelphia, PA 19111-5094, phone (215) 697-2197 or DSN 442-5164.) 2.3 Non-Government publications. The following document forms a part of this document to the extent specified her
15、ein. Unless otherwise specified, the issues of the documents, which are DOD adopted, are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2)
16、. SOCIETY OF AUTOMOTIVE ENGINEERS SAE AMS-“3171 Magnesium Alloy, Processes for Pretreatment and Prevention for Procurement and Prevention of Corrosion on 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-265 17B (Applications for copies may b
17、e addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096-0001, phone (412) 776-4841 or FAX: (412) 776-4026) 2.4 Order of Precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated spe
18、cifications, specification sheets, or MS standards), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The power supplies furnished under this spe
19、cification shall be those products which are qualified for listing on the applicable qualified products list (QPL) at the time set for opening of bids (see 4.3 and 6.3). 3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified h
20、erein shall be selected in accordance with current industry standards. 3.3 Materials. 3.3.1 Fungus-proof materials. Materials that are nutrients for fungi shall not be used where it is practicable to avoid them. Where used and not hermetically sealed, they shall be treated with a fungicidal agent ac
21、ceptable to the procuring activity. However, if they will be used in a hermetically sealed enclosure, fungicidal treatment will not be necessary. 3.3.2 Combustible materials. Materials that support combustion and maintain open flame after the ignition source has been removed shall not be used. High-
22、temperature materials shall be used throughout the power supply (see 4.5.1). 3.3.3 Metals. Metals shall be of the corrosion-resistant type or suitably treated to resist corrosion due to fuels, salt spray, or atmospheric conditions that may be encountered in storage or normal service. Tests to confir
23、m corrosion resistant metals are contained in section 4, Table I, sequence numbers 23 and 24, paragraphs 4.5.12.2 Humidity and 4.5.12.3 Salt Spray. 3.3.3.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each o
24、ther. Dissimilar metals are defined in MIL-STD-889. 3.4 Design and construction. Unless otherwise specified, the power supply shall meet the requirements specified herein. 3.4.1 Components. The power supply shall consist of transformers, rectifiers, and other components, except electron tubes, neces
25、sary to meet requirements for the performance specified herein. Parallel diodes shall not be used. 3.4.2 Input current balance. The current input to each phase of the power supply shall be within 5 percent of the average value of the effective current in all phases for any condition from % load to f
26、ull load (see 4.5.16). 3.4.3 Voltage adiustment range (Type I only). The output voltage of the power supply shall be adjustable over the range as specified in the acquisition document (see 6.2). The adjustment control shall be readily accessible and provisions shall be made for positive locking. 3.4
27、.4 Service life. The power supply, with the exception of the fan motor, shall be designed for a service life of at least 8,000 hours without maintenance. The fan motor, if supplied, shall have a life of at least 1,500 hours without maintenance. 3 Provided by IHSNot for ResaleNo reproduction or netwo
28、rking permitted without license from IHS-,-,-MIL-DTL-265 17B 3.4.5 Cooling. The power supply shall be cooled as specified in the acquisition document (see 6.2). Fan motors, where specified, shall conform to MIL-“7969. 3.4.5.1 Explosion-proof fan motor. The cooling-fan motor shall be an explosion-pro
29、of type which shall not be adversely affected internally nor ignite an explosive mixture outside the unit (see 4.5.12.10.1). 3.4.6 Electrical connections. Internal wiring of the unit shall be in accordance with the acquisition document (see 6.2) and shall terminate as specified therein. 3.4.7 Preven
30、tion. Accidental loosening of bolts, screws, and other connections shall be prevented by lock- washers, lock nuts, staking, or other approved methods 3.4.8 Protection. All ventilating openings shall be of such size as to prevent passage of a 5/16-inch diameter rod. 3.4.9 Reliability. The power suppl
31、y shall have a minimum acceptable meat-time-between-failures (MTBF) of 450 hours demonstrated to a 90-percent confidence level (see 4.5.18). 3.5 Performance. The power supply shall be capable of operating satisfactorily under the following conditions or natural combinations thereof a. Temperature-al
32、titude in accordance with Figure 1 (see 4.5.12.7). b. Temperature constant at -59“ C from sea level to the maximum altitude in accordance with Figure 1 (see 4.5.12.1). c. After prolonged storage at -65“ C (see 4.5.12.1). d. Relative humidity up to 100 percent, including conditions wherein condensati
33、on takes place in the form of both water and frost (see 4.5.12.2). e. Moist fungi encountered in tropical and semitropical climates (see 4.5.12.5). f. Vibration incident to service use (see 4.5.12.4). g. Exposure to sand and dust as encountered in desert areas (see 4.5.12.6). h. Exposure to atmosphe
34、re containing salt-laden moisture (see 4.5.12.3). 3.5.1 Input power. The power supply shall be capable of operating from an alternating current (AC) power source as specified in MIL-STD-704. 3.5.1.1 Power factor. The full-load and half-load power factors shall be not less than that as specified in t
35、he acquisition document (see 4.5.14 and 6.2). 3.5.2 Input voltage. Rated input voltage shall be 200 V. The Type-I power supply shall be designed for operation on a voltage range of 190 to 210 V. 3.5.2.1 Transient input voltage. The power supply shall be capable of withstanding a transient input of t
36、wice rated voltage for 0.1 second (see 4.5.15). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-265 17B O 10 20 30 40 50 60 70 Pressure Altitude - 1000 Feet - Minimum temperature curve is applicable to all equipment designed to either maxim
37、um temperature Curve I or II. - Maximum temperature Curve II is applicable only for interim procurement and if specifically permitted by this detail specification. - Test conditions per this detail specification. - Curve I indicates the maximum temperatures to which equipment must be designed to ope
38、rate satisfactorily in unconditioned compartments of high performance aircraft powered by air consuming engines. - Curve II indicates the maximum temperatures to which equipment must be designed to operate satisfactorily in conditioned compartments of high performance aircraft or in low performance
39、aircraft. FIGURE l. Altitude-temperature range. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-265 17B 3.5.2.2 Output voltage. Unless otherwise specified in the acquisition document (see 6.2), the output voltage shall be in accordance with
40、 MIL-STD-704. 3.5.3 Frequency. Rated frequency shall be 400 Hertz (Hz), however, the power supply shall be designed for operation on a frequency range of 380 to 420 Hz (see 4.5.6). 3.5.4 Continuous rating. The power supply shall be capable of delivering a continuous output in accordance with the rat
41、ing chart shown in the acquisition document (see 6.2). 3.5.5 Five-minute rating. The power supply shall be capable of delivering 150 percent of continuous rated current for cyclical operation of 5 minutes on and 15 minutes off for a period of 7 hours. Under this overload condition, the voltage shall
42、 not be less than that specified in the acquisition document (see 4.5.17a and 6.2). 3.5.6 One-minute rating. The power supply shall be capable of delivering 250 percent of continuous rated current for cyclical operation of 1 minute on and 18 minutes off for a period of 7 hours. Under this overload c
43、ondition, the voltage shall be not less than that specified in the acquisition document (see 4.5.17b and 6.2). 3.5.7 Short-circuit capacity. The power supply shall be capable of delivering a short-circuit current of at least 500-percent rated-load current for 1 second (see 4.5.8.3). 3.5.8 Over-volta
44、ge. The power supply shall be capable of continuous operation on an input voltage of 220 V (see 4.5.13). 3.5.9 Temperature rise. The temperature rise of the components shall not exceed their breakdown limit under the temperature and altitude operating conditions shown in the acquisition document (se
45、e 4.5.12.7.1 and 6.2). 3.5.10 Voltage regulation (see 4.5.2). 3.5.10.1 Type I regulated units. The power supply shall be so designed that the output voltage will remain within the limits specified in the acquisition document (see 4.5.2.1 and 6.2) when the load on the power supply is varied from no l
46、oad to full load and the input voltage and frequency are maintained within the limits of 190 to 210 V and 380 to 420 Hz (see 4.5.6). No bleeder resistor shall be connected between the direct current (DC) output terminals of the power supply. 3.5.10.2 Type II non-regulated units. The power supply sha
47、ll be so designed that the output voltage will remain within the limits specified in the acquisition document (see 4.5.2.2 and 6.2) when the load on the power supply is varied from the minimum specified load to full load and the input voltage and frequency are maintained within the limits of 195 to
48、210 V and 380 to 420 Hz (see 4.5.6). No bleeder resistor shall be connected between the DC output terminals of the power supply. 3.5.10.2.1 No-load output voltage. At an input voltage of 210 V, the no-load output voltage of the Type II power supply shall not exceed that specified in the acquisition
49、document (see 6.2). 3 S. 1 1 Parallel operation. 3.5.11.1 Type I regulated units. The power supply shall be so designed that two or more units can be operated in parallel. During parallel operation, the output current and voltage shall remain within the limits specified in the acquisition document (see 6.2). 3.5.1 1.2 Type II non-regulated units. The power supply shall be so designed that two or more units can be operated in parallel. During parallel operation, the output voltage and curren
