DLA MIL-T-83720-1968 TRANSFORMERS AND INDUCTORS NON-EXPLOSIVE GENERAL SPECIFICATION FOR《防爆变压器和电感器的一般规定》.pdf
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1、MIL-T-3720 59 W 9797906 OOOL25 7 I 27 Sepcembe; 1968 Sv PSRSEDING SGMES PD-L!+8A 3i March i967 MILITARY SPECIFICATION TFtANSF0RME;RS AND INDUCTORS, NON4XPLOSIVE , CrENERAL SPECIFICATION FOR 1.0 scorn 1.1 Scope. This specification contains the general requirements for non- explosive transformers of o
2、pen coil and core construction intended for use in svaled electronic air-environment enclosures. 2.0 APPLICABJE DOCUMENTS 2.1 tion for bids or request for proposal form a part of %his specification to the extent specified. The following documents of thg issue in effect on date of invita- SPECIFICATI
3、ONS Mili targ MIL-T -27 MIL-P- STANDARDS Federal Fed STD-595 Militam MILS TD -12 9 MI L-S TD -13 OC Transformers and Inductors (Audio power, and liigh power pulse General Specification for) Preservation, Methods of Paint, Requirements Marking for shipment l). 3.9 Induced Voltage. When transforners a
4、nd inductors are tested as specified in MIL-T-27, there shall be no evidence of continuous arcing, breakdown of insulation, or any abrupt changes in input current (see 4.1). 3.10 InsulLstion Besistance . When transfomers and inductors are masured as specified in MIL-T-27, the minimura insulation res
5、istance shall be 7500 megohms (see 4. i). 3.11 Winding Continuity. Whm .transforinsrs and 5nductors are tested as specified in LXIL-I-27, all windings shall be electrically continuous (see 4.1). 3.12 Electrical Characteristics. When transforiners md inductors are kested as specified in MiL-1-27, the
6、 applica3le electrical characteristics shall be as specified, including tolerances (see 3.1 and lk.1). 3 .i3 Temperature Rise. specified in IIILdT-27, the temperature rise of any winding above the specified x&um ambient temperature (see 3.1) shall not exceed the valus specified (see 3 .i) .and there
7、 shall be no evidence of physical damage (see 4.1). When 5ransformei-s and inductors are tested as , “I Licensed by Information Handling Services- .- MIL-T-3720 59 a 9999906 0080329 4 W MIL-T-yFL)( USAF 1 3.l4 Thermal Shock. W.sn transfomers and inductors are tested as specified in MIL-1-27, not mor
8、e than 10 percent of the surface shall have peeling, flaking, chipsing, cracking, crazing, or other impairinsnt of the protective coating (see 4. i). 3.15 Vibration. When trmsforrners and inductors are tested as specified in LyIL-T-27, not more than 10 percent of the surface shall have peeling, flak
9、ing, chipping, cracking, crazing, or other hpimnzn: of the protective coating (see 4.1). 3.16 Shock. NIL-T-27, not illme than 10 percent of the surface shall have peeling, flaking, chipping, cracking, crazing, or other impairmsnt of the protective coating (see &.i). When transformers and inductors a
10、re tested as specified in 3.17 Qverload. When transforinera and inductors are tested as specified in MIL-I?-27, not mm-e than 10 percent of the surface shall have peeling, flaking, chipsing, cracking, crazing, or othher impairinent of the protective coating (see 4. I). 3.18 - Life. NIL-T-27, there s
11、hall be no evidence of physical or electrical damage (see 4.1). When transfomsrs and inductors are tested as specified in 3.19 Resistance to Soldering Heat. When transformrs and inductors are tested as specified in MIL-I?-27, there shall be no softening of the insulation or loosening of windings or
12、terminals (see 4.1). 3.20 Marking. Transfomers and inductors shall be marked in accordance with MIL-STD-130. transformer or inductor and each terminal shall be idsntified by the applicable nimber specified in the detail specification. The manufacturers part nunber shall be stamped on the 3.20.1 Symb
13、ol. Transformers arnd inductors supplied per this specification shall be identified by the symbol illustrated in Figure 1. The color shall be red 11105 per Fed. STD 595. 3.21 Workinanship. Transfomers and inductors shall be processed in such a manner as to be uniform in quality and shall be free fro
14、m defects that will affect life or serviceability. 4.0 QUAUTY ASSURAN PROVISIONS 4.1 Walitg Assurance. The quality assurance provisions of MILdT-27 ap?ly as requirenents of this specification unless otherwise specified. 5 Licensed by Information Handling Services- MIL-T-3720 57 W 7797706 OOOl130 O W
15、 MIL-T-83720( US Al! ) Outline dimensions of the marking synbol to be of bine relative proportims indicated below. 2 Numbers are absolute FIGURE I Marking Symbol ( see para 3.20 _- _. -.y- 6 Licensed by Information Handling Services- MIL-T-83720 57 W 7177706 0080131 2 MIL-T -83720 (US AF ) 4.1.1 Res
16、ponsibility for Inspection. Unless otherwise specified in the conbract or pnchase order, the supplier is responsible for the performance of all inspection requirenients as specified herein. Except as otherwise specified, the sup2lier may utilize his o-i facilities or any cormercial laboratory accept
17、able to the Goverment. examination axl tests shall be kep,t complete and available to the Govern- ment as specified in the contract or order. The Goverment reserves the right to perform any of the inspections set forth in the specification where such inspsctions are dsemed necessary to assure suppli
18、es and services confom to prescribed requirements. 4.1.1.1 Test equipmnt and inspection facilities. Test equipment and inspection facilities shall be of sufficient accuracy, quality, and qxmtity to pelirfit perforniance of the required inspection. The supplier shall establish calibration 3f inspecti
19、on eqxiprnent to the satisfaction of the Government. Inspection records of the 4.2 Classification of Inspections. The examination and testing of transformers and inductors shall be classified as follows: a. Preprxhction Inspection b. Acceptance Inspection 4.3 Preproduction Inspection. Preproduction
20、inspection will be per- formed by the supplier after award ai? contract and prior to pyod-Action at a location acceptable to the Government. The tests to be perforinsd shall consist of the tests listed in Table I. accordance with MIL-T-27, unless otherwise specified. The tests shall be performed in
21、4.3.1 Material Decompsition. Sup2liez-s furnishing transforniers and inductors per this specification shall furnish dakailed %ata sho-ng quantitatively the gases of decoinposition of the materials of the transfomer or inductor at temperatures froin 100C through 50C. data shall be sufficient to prove
22、 to the satisfaction of the Govern- ment that the materials of decomposition are non-eqlosive and cannot combins to form an explosive mi-xbure (see 6.2). The 7 Licensed by Information Handling ServicesMIL-T-3720 57 m 777770b OOOL32 4 m _ - - MIL-T-83720( USAF ) TABE3 I PFEPRODUCTIOX TESTS Test Metho
23、d Grmp I (All sample units) Reauirement Para Visual & Mechanical Inspection (External) 3.1, 3.4, 3.4. 1 4- 1 Die lec tric Withstanding Voltage 3 .e 4.1 Barometric Pressure (When applicable) 3.8.1 4.1 Ind-xed Voltage (When specified) 3.9 4.1 Electrical Characteristics 3-12 4-1 Corona Discharge (When
24、specified) 3.7 4.1 Insulation Re si stance9 3.10 4.1 3.4.4, 3.5, and 3.21 Group II (2 ea units2 Temperature Rise (i sample) Thew1 Shock Vibration Shock (Winding Continuity) Dielsctric withstanding voltags (9% of initial) Induced Vo It age Winding Continuity Overload Dielectric withstanciing voltage
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