1、MIL-P-3802bA 61 m 7779706 0071524 T m B- S-05 MIL-P-38026A(USAF) 31 January 1968 Superseding 19 October 1962 MIL-P-38026 (USA F) MILITARY SPECIFICATION POWER SUPPLY ECU-23/A 1. SCOPE 1.1 This specification covers one type of unregulated, 200-amp, 28V dc, silicon diode power supply, designatedECU-23/
2、A. 2. APPLICABLE DOCUMENTS 2.1 in effect on date of invitation for bids, or request for proposal, form a part of this specification to the extent specified herein. The following documents, of the issue SPEC I FICATIONS Federal MIL-G-6099 Generators and Regula- tors, Air Cooled, A-C, Aircraft, Genera
3、l Specifi- cation for MIL-1-6181 Interference Control Re- quirements, Aircraft Equipment MIL-S-7742 Screw Threads, Standard, Optimum Selected Series, General Specification for MIL-A-8625 Anodic Coatings, for Alu- minum and Aluminum Alloys ML-W-16878 Wire, Electrical, Insu- lated, High Temperature QQ
4、-P-416 Plating, Cadmium (Elec- STANDARDS trodeposited) Military MIL-M-14 Molding Plastics and Molded Plastic Parts, Thermosetting MIL-S-3151 Sound - Level - Measuring Equipment MIL-M-3171 Magnesium Alloy, Pro- cesses for Pretreatment and Prevention of Corro- sion on MIL-E -5272 Environmental Testing
5、, Aeronautical and Associ- ated Equipment, General Specification for MIL-C-5541 Chemical Films and Chemical Film Materials for Aluminum and Alu- minum Alloys . . ilcuLtiiiuii- Military MIL-STD-100 Engineering Drawing Practices MIL-STD-130 Identification Marking of U. S. Military Property MIL-STD-143
6、 Specifications and Stan- dards, Order of Prece- dence for the Selection of MIL-STD-454 Standard General for Electronic Equipment MIL-STD-704 Electric Power, Aircraft, Characteristics and Uti- lization of MIL-STD-831 Test Reports, Preparation of MS3102 Connector, Receptable, Electric, Box Mounting F
7、SC 6130 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-: - MIL-P-302bA b1 = 9999906 O091525 1 MIL-P-38026A( USAF) MS33586 Metals, Definition of Dis- similar (Copies of documents require by con- tractors in connection with specific pro- curement fu
8、nctions should be obtained from the procuring activity or as directed by the contracting officer,) 3. REQUIREMENTS 3.1 Qualification. The power supply fur- nished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for.
9、 opening of bids, 3.2 Selection of specifications and stan- dards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accor- dance with MIL-STD-143. 3.3 Materials 3.3.1 Metals. Metals shall be of the corrosion-resistant type, unless suitably
10、 protected to resist corrosion. 3.3.1.1 Dissimilar metals. Unless suit- ably protected, dissimilar metals shall not be used in intimate contact. Whenpro- tection is used, it shall be of such type that a low-impedance is produced for radio-frequency currents. Dissimilar metals are defined in MS33586.
11、 3.3.2 Combustible material. Materials that will support combustion and main- tain open flame after the ignition source is removed shall not be used in the power supply. H igh-temperature materials shall be used throughout. 3.3.3 Protective treatment. When mate- rials are used in the construction of
12、 the power supply that are subject to deterio- ration when exposed to climatic and environmental conditions likely to occur during service usage, they shall be pro- tected against deterioration in a manner that will in no way prevent compliance with the performance requirements speci- fied herein. T
13、he use of any protective coating that will crack, chip, or scale with age or extremes of climatic and en- vironmental conditions shall be avoided, *3.3.4 Plastic materials. The selection and use of plastic materials shall be in accordance with MIL-STD-454 Require- ment 11. The DC output terminal blo
14、ck shall be molded of thermosetting plastic type MAI-60 in accordance with MIL-M-14. 3.4 Design and construction 3.4.1 Design. The power supply shall be completely static. with no movingparts. It shall be designed to operate from a 115/200V, 3-phase, 380 to 420 cps power source. 3.4.1.1 Current bala
15、nce, 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 one-fourth to full load. *3.4.1.2 Isolated output. The d-c output circuit shall have direct current isolation from the frame and from
16、the a-c input circuit. *3.4.1.3 Diodes. Paralleled diodes shall not be used. 3.4.2 Construction. The power supply shall be so constructed as to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, installation, and service, 3.5 Performance. The power supply sh
17、all be capable of meeting the require- ments specified herein when subjected to the following conditions: a. , Altitude - Pressure from sea level to 50,000 altitudes ranging feet 2 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - NIL-P-3802bA 63
18、= 7777906 0073526 3 MIL-P-38026A(USA F) b. High temperature - Temperatures *3.5.2 Parallel operation. Two power varying uniformly from 71C at sea level supplies shall be capable of sharing cur- to 15C at 30,000 feet, and 2C at 50,000 rent to a common load with a maximum feet difference of 25 amperes
19、 for total load currents from 350 to 400 amperes when c. Low temperature - Temperaturecon- operating from a a-c stant at -54C from sea level to 50,000 feet d. Humidity - Relative humidity up to 3.5.3 Rated load and overload 95 percent, including conditions wherein 3, 5, 3. Rated load, The power supp
20、ly shall be capable of delivering acontinuous output of 200-amp dc, both water and ice takes place in the form Of e. vice use Vibration - Vibration incident to ser- f. Fungi - Fungus growth as encountered in tropical and semitropical climates g. h. Sand dust - Sand and dust particles as encountered
21、in desert areas Acceleration - An applied acceleration of log i. Salt spray - Exposure to salt sea atmosphere for a period of 50 hours j. fied in 4.6.23. Shock - Shock forces of 15g as speci- +3.5.1 Output voltage. The output voltage with 200 volts, 400 cps input shall be within the limits of figure
22、 1 for loads from 5 am- peres to 200 amperes and as required to comply with 3.5,2. The output voltage shall be within the limits of 24.2 to 3.5.3.2 Overload. After temperature stabilization at rated load, the power supply shall be capable of delivering 150 percent of rated load for aduration of 5 mi
23、nutes under any conditions specified herein. 3.5.3.2.1 After temperature stabilization at rated load, the power supply shall be capable of delivering 250 percent of rated load for a duration of 1 minute under the conditions specified herein. 3.5.4 Short-circuit capacity, The power supply unit shall
24、be capable of delivering a short-circuit current of 1800 amperes to 2400 amperes after temperature stabi- lization at rated load and under the con- Qitions specified herein, The a-c input current for each phase required to produce the short-circuit current shall be sus- tained for a period of not le
25、ss than that shown on figure 2. 30*5 for loads from 5to 210amperes 3.5.5 Inverse volta e. The power supply with input voltage variations from 190 to shall be capable of a con- 210 and with input frequency tinuous inverse voltage of 200V and voltage transients in accordance with 4.6.10. 380 to 420 cp
26、s. 3.5.1.1 No load voltage. With an input 3.5.6 Transient input voltage. The power voltage of 210V, a frequency of 420 cps, supply shall be capable of withstanding a and a load current of 0.80 amp, the power transient input voltage of 230V for 10 sec- supply d-c output voltage shall not exceed onds
27、and twice rated voltage for 0.1 sec- 35v. ond. o 3 -. _ IT- I- * r . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-3802bA 61 m 9999706 0091527 5 m 28.04 27.25 26.71 26.26 25.86 1 25.78 VOLTAGE REGULATION 200 VOLTS, 400 CPS INPUT 25 2iOC AMBIE
28、NT 28.76 27.95 27.39 26.94 26.50 i 26.42 4 5 50 IO0 I50 200 21 o OC LOAD CURRENT - AMPERES i(F1GURE 1. Output Voltage Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-3802bA bL 7779906 0093528 7 MIL -P -3 802 6A( U SA F) w v) I a n a n u) n I U
29、I- z w a 3 u I- 3 z w L. Y a n - - 0.1 I ,o TIME IN SECONDS IO FIGURE 2. Short Circuit Rating I 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-302bA bL m 7777906 0073527 7 MIL-P-3802 6A(USAF) 3.5.7 Input factor, The input power factor shall
30、be not less than 90 percent from one-half to fui1 rated load, 3.5.8 Efficiency. The.overal1 efficiency shall be not less than 85 percent from one-half to full rated load. 3.5.9 Ripple voltwe. The ripple voltage shall not exceed 1.1 volt peak to peak for all loads up to full load. 3.5.10 Ripple freuu
31、encs. The frequency components of the ripple shall not exceed the limits specified in MIL-STD-704. 3.5.11 Acoustical noise. The acoustical noise output of the power supply, when measured at a distance of 1 foot, shallnot exceed 67 db. 3.5.12 Radio interference. The power supply shall meet the radiat
32、ed interference requirements of MIL-1-6181. The maxi- mum limit for broadband and pulsed con- tinuous wave conducted interference shall be within the limits shown on figure en- titled “Broadband and pulsed CW con- ducted interference limits using stabi- lization network“ in MIL-1-6181, except that t
33、he slope of the curve shown on this figure shall be modified so that it starts at 0.1 mc, 92.5 db above 1 microvolt per mc and joins the horizontal portion of the curve at 2 mc, 81 db above 1 microvolt per mc. 3.5.14 Operational loads. The power supply shall supply the loads specified herein when mo
34、unted with the base down, in a horizontal plane, andwith the still-air valume around the unit equal to three times the volume of the power supply. The maxi- mum external frame temperature at rated load under any condition shall not exceed 149C. 3.5.15 Dielectric strength. The power supply shall with
35、stand application of 1,500V rms commercial frequency be- tween the a-c input terminals and the frame and between the d-c output terminals and the frame for a period of 1 minute. 3.5.16 Operating positions, The power supply shall be capable of operating at any position from a normal base-down, horizo
36、ntal-plane position, to a maximum tilt of 16“ from this position. It shall be capable of satisfactory operation in the ahove tilted position for a period of 1 hour and in any position for a period of 5 min- utes, 3.5.17 Threaded terminals. Terminals shall be as shown on figure 3. They shall withstan
37、d static values of 115 pounds pull and 225 pound-inches of torque in both directions for 1 minute without distortion, turning :or loosening, 3.5.17.1 Terminal configuration. The 3.5.13 Service life. The power supply output terminal studs shall be designedso shall have a service life of 10,000 hours
38、that the primary current paths shall be without maintenance under the following from connecting cable terminal lugs to load cycles: receiving cable terminal lugs through a brass sleeve or stud shoulder. The clamp- a. 1,000 hours at 25 percent load ing force to hold the lugs together or against the s
39、leeve or shoulder shall be b. applied through the nut and stud assembly. Plastics shall not be used in the com- c. 2,000 hours at 100 percent load, pression stackup of lugs, washers andnuts. 7,000 hours at 50 percent load 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without
40、 license from IHS-,-,-OC 03 *. E L ax 04 I=, o 4 +I *? IC il . 03 i2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-3802bA b3 W 99999Ob 0093533 7 W 3.6 Part numberinp of interchanmable pats. All parts having the same manu- facturers part numbe
41、r shall be func- tionally and dimensionally interchangeable. The item identification and part number requirements of MIL-STD-100 shall govern the manufacturers part numbers and changes thereto. 3.7 Wiring. The power supply shall be wired in accordance with MIL-STD-454, Requirement 9. External connec
42、tions shall be a3 shown on figure 3. Wire shall be in accordance with MIL-W-16878, type EE. 3.7.1 Wiring diamam. A wiring dia- gram of the power supply shall be per- menently attached to the unit. 3.8 Screw threads. All screw threads shall be in accordance with MIL-S-7742. 3.9 Outline dimensions Out
43、line dimen- sions shall be in accordance withfigure3. 3.10 Weight. The weight of the power supply shall not exceed 34.5 pounds. 3.11 Einishes and protective c0ating-s 3.11.1 Aluminum alloy parts. When- ever practicable, aluminum alloy parts shall be treated in accordance with MIL- (3-6541 or M1L-A-8
44、625. The aluminum oxide formed by MXL-A-8625 treatment shall be removed from the actual contact thor- oughness of soldering, welding, brazing, wiring, and riveting, tightness of assembly screws, bolts, and nuts; marking of parts and assemblies; and freedomof parts from defects, burrs, and sharp edge
45、s. 4. QUALITY ASSURANCE PROVISIONS 4.1 Suppliers responsibility, U n 1 e s s otherwise specified in the contract or purchase order the supplier is responsible for the performance of all inspection re- quirements as specified herein. Except as otherwise specified, the supplier may utilize his own fac
46、ilities or any com- mercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to as- sure supplies and services conform to prescribed requirements. 4.2 Classification
47、 of tests. The inspec- tion and testing of power supplies shall be classified as follows: a. Qualification tests b. Acceptance tests. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-3802bA 61 9797906 0071532 9 4.3 Test conditions. Unless otherw
48、ise specified, the following test conditions shall apply: a. Ambient temperature: 25“ 110C b. Altitude: Atmospheric pressure (ap- proximately 29.92 inches Hg) c. Input power: 115/200V, 400 cps d. Voltage measurement: At terminals of the power supply e. Location of load: Such that it will not appreci
49、ably affect the ambient temperature 4. No-load current: 0.80 amperes maxi- mum ig. Frame ground: The frame of the unit shall be externally connected to the neutral of the a-c supply and to the negative d-c terminal. *4.3.1 Test enclosure. The tests speci- fied in 4.3.1.1 shall be conducted with the power supply mounted with base down, in a horizontal plane, and in an enclosure as shown on figure 4.
