1、12 April 1962 SUPERSEDING MIL -1-228 34 (SHIPS) 14 March 1961 MILITARY SPECIFICATION INSULATION, ELECTRICAL, DIELECTRIC BARRIER, LAMINATED, PLASTIC FILM AND SYNTHETIC FIBER MAT 1. SCOPE 1.1 Scope. - This specification covers insulation used primarily as dielectric barriers in class B (130C) electric
2、al machinery. 1.2 Classification 1.2.1 Compositions. - The electrical insulation shall be of the following compositions, as specified (see 6.3): Composition D100 - One layer of polyethylene terephthalate fiber mat laminated to each side of a polyethylene tereph- thalate film or sheet (tri- plex). Th
3、e mat is com- pletely impregnated with epoxy resin, Composition D70 - One layer of polyethylene terephthalate fiber mat laminated to each side of a polyethylene tereph- thalate film or sheet (tri- plex). The mat is 70 percent impregnated with epoxy resin. - One Iayer of polyethylene terephthalate fi
4、ber mat laminated to each side of a polyethylene tereph- thalate film or sheet (tri- plex). The mat is heat bonded to the film. Composition D 1.2.2 Types. - The electrical insulation shall be of the follomypes (see 6.3): Types: D100-323 D100-353 D100-535 D70 -323 D70 -353 D -313 Types (contd): D -32
5、3 D -555 D -636 1.2.3 Forms. - The electrical insulation shall be of the following forms, as specified (see 6.3): Form R - Rolls, trimmed, 36 inches in width, in lengths as follows: D100-323 D100-353 D100-535 D70 -323 D70 -353 D -313 D -323 D -555 D -636 Length per roll (Lineal yards) 400 300 250 40
6、0 300 400 300 250 250 Form S - Sheets, 36 inches wide by 36 inches in length, in packages of 200 sheets, 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in ef- fect on date of invitation for bids, form a part of this specification to the extent specified herein: SPECIFICATIONS FEDE
7、RAL VV-1-530 - Insulating Oil, Electrical, for Transformers, Switches, and Circuit Breakers. mITARY MIL-1-631 - Insulation, Electrical, Synthetic-Resin composition, Non-rigid. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STANDARDS FEDERAL FED-STD-
8、601 - Rubber: Sampling and Testing. (Copies of specifications, standards, drawings, and publications required by contractors in connec- tion with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer,) 2.2 Other publications, - The fo
9、llowing docu- ment forms a part of this specification to the extent specified herein, Unless otherwise indicated, the issue in effect on date of invitation for bids shall WPlY OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules (Application for copies should be addressed to the Of
10、ficial Classification Committee, 1 Park Av- enue at 33rd Street, New York 16, New York) 3, REQUIREMENTS 3.1 Material. - 3.1.1 Plastic film or sheet, - The polyethylene terephthalate film or sheet shall conform to type G Of MIL-1-631. D100-323 D100-353 D100-535 D70 -323 D70 -353 D -313 D -353 D -555
11、D -636 rl Nominal combined insulation thickness (see 6.3) Inch o. O09 ,012 ,014 . O09 * 012 ,007 o11 ,015 ,015 3.1.2 Synthetic fiber mat. - The mat shall be composed of polyethylene terephthalate fibers and may be impregnated with epoxy resin. If the im- pregnation is complete with all fibers secure
12、ly an- chored, the mat shall be considered 100 percent impregnated, and shall be denoted D100. If the im- pregnation is only 70 percent complete, there will be freely moving fibers on the surface with a fuzzy ap- pearance, and the mat will be denoted D70. If the mat is bonded to the film by heat bon
13、ding, and with freely moving fibers on the surface with a fuzzy ap- pearance and with no impregnation, the mat will be denoted D. 3.1.3 Composite insulation, - The composite in- sulation shall be uniform in density without breaks, cracks, wrinkles, or flaws of any kind, The mat shall be uniform, and
14、 there shall be no tendency towards splitting or separation of the laminations. The layers shall be cemented together with either a class B flexible insulating binder, or by heat bond- ing. The insulation shall be free from electrically conductive particles, dirt, and other foreign mate- rial that m
15、ay affect the serviceability of the finished product 3.2 Construction and thickness. - The electrical insulation shall conform to the construction and thickness shown in table I (see 6.3). Table I - Construction and thickness. Tolerance of average combined thickness from nominal thickness Minus Inch
16、 0.001 , O01 , O01 , O01 , O01 , O01 , O01 ,0015 ,0015 - Inch- 0.001 . O01 .O015 .O015 Nominal thickness (inch) and component (designation) L/ First layer O. 003D100 .003D100 .005D100 ,003D70 .003D70 ,003D ,003D .005D .006D Second layer I Third layer 0.002F .005F .003F ,002F .005F ,001F 05F a 003D10
17、0 003D100 005D100 003D70 003D70 003D 003D ,005 F .005D 003F .006D i Designations: F - Plastic film or sheet, D100 - Polyethylene terephthalate fiber mat completely impregnated with epoxy resin. D70 - Polyethylene terephthalate fiber mat 70 percent impregnated with epoxy resin. D - Polyethylene terep
18、hthalate fiber mat with no impregnation. 3.3 oysical requirements. - The electrical insulation shall conform to the physical require- ments shown in table II. 2 3.4 Workmanship. - Workmanship shall be first class in every respect. - - Provided by IHSNot for ResaleNo reproduction or networking permit
19、ted without license from IHS-,-,-00000 mmooo 00000 rlrlrlrlrl al c, $2 z 3 -4 00000 $:z:=Izz al 22 2 O0 rlrl rlrl 3 v mm 4 3 v O0 NN oommm OONNN (owmu?m al L-m 8 rlrl z %8 mo HO rlrl Z8 O O00 om000 oc.000 rlmdrlrl al 8 8B R N rlm 4 00000 L-mr-f-c. mmmmm m m (um Ei FI al $8 2 om mmmmm LQNZZZ m com rl
20、w al 9% O O00 omooo or- rlmSZ2 om 22 al 8 E2 R omooo mNmmm ww(ocD(o m rlo rlw 8 .- a V .a O O0 mm NN a dr; r; 33 a mm w 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4. QUALITY ASSURANCE PROVISIONS 4,l Unless otherwise specified in the contxact t
21、he performance of all inspection requirements as specified herein. The government reserves the 4.2.1 x- All material of the same com- position, type, and form, manufactured under es- sentially the same conditions within a period of 15 days, and offered for delivery at the same time, formance inspect
22、ion, Or purchase order, the supplier is for shall be considered a lot for purposes of quality con- Sample size rolls and pack- ages to be examined 2 3 5 7 .A 10 15 20 25 30 4.2.2 Sam ling for visual and dimensional ex- amination, - SPamples of niaterial shall be selected sional characteristics in ac
23、cordance with table III. right to perform any ofthe inspections set forth in the specification where such inspections are deemed to prescribed requirements. necessary to assure supplies and services conform from each lot for examination of visual and dimen- Acceptance number (defective) O O O O O O
24、1 1 1 The lot size and sample size shall be stated in terms be examined from any roll or package. 4.2 Sampling for quality conformance inspec- of rolls and packages, Approximately 5 yards shall - tion. - Table II - Sampling for visual and dimensional examination. Lot size number of rolls and package
25、s 2 to 8 9 to 15 16 to 25 26 to 40 41 to 65 66 to 110 111 to 180 181 to 300 301 to 500 Rejection number (defective) 4.2.3 Sampling for quality conformance tests. - One fifth of the rolls or packages selected for the visual and dimensional examination shall be sub- jected to the quality conformance t
26、ests specified in tabIe IV; however, the smallest number of rolls or packages selected for any sample shall be two. 4.3 Quality conformance inspection, - 4.3.1 Visual and dimensional examination. - Each of the samples selected in accordance with 4.2.2 shall be visually and dimensionally examined to
27、verify conformance with the requirements of 3.1, 3.2, and 3.4. Any sample roll or package containing one or more visual or dimensional defects shall be considered defective, and if the number of defective rolls or packages exceeds the acceptance number for that sample, this shall be cause for reject
28、ion of the lot represented by that sample, In the case of rolls, the outer layer of the rolls shall be discarded, and the next five linear yards shall be examined. 4.3.2 Quality conformance tests, - Quality con- formance tests shall be conducted on samples of material selected in accordance with 4.2
29、.3. Two linear yards from each sample roll or package shall be subjecteg to the tests specified in table IV. Re- sults shall be averaged for each sample roll or pack- age represented to determine conformance with this specification. If the average for any sample roll or package fails to conform with
30、 any requirement, this shall be cause for rejection of the lot represented by the sample, 4.4 Test conditions. - 4.4.1 Conditions. - Unless otherwise specified herein, all tests shall be conducted under conditions of 23“ i 1.1“ centigrade (C.) and 50 i 2 percent rel- ative humidity (r . h. ) . 4.4.2
31、 Designation. - Conditioning procedures shall be designated as follows: (a) A capital letter indicating the general con- dition of the specimen: “C“ indicates hu- midity and “E“ indicates temperature conditioning. Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
32、rom IHS-,-,-(b) A number indicating in hours the duration of the conditioning. (c) A number indicating in degrees C. the con- ditioning temperature. (d) A number indicating relative humidity whenever relative humidity is controlled. The numbers shall be separated from each other by slant marks, and
33、from the capital letter by a dash. Examples: C-96/23/50 - 96 hours, 23“C., 50 percent C-96/23/96 - 96 hours, 23C. , 96 percent E-168/150 - 168 hours, 150C. relative humidity. relative humidity. 4.5 Test procedures. - 4.5.1 Thickness. - The total thickness of the material shall be determined by the u
34、se of a dial type micrometer. The lower or fixed anvil of the dial micrometer shall consist of a flat steel plate 2 inches in diameter; the upper or movable member shall consist of a foot having a flat steel face meas- uring 1/4 inch in diameter, and shall be arrangedso as to move with its face exac
35、tly parallel to the face of the anvil at all times. The movable member shall be of such weight, and be attached to the operating rod of the micrometer in such a manner, that 20 ounces dead weight shall be applied to all thicknesses of samples being measured. The thickness shall be determined as the
36、average of at least 10 readings taken at representative points on the material. The maximum, minimum, and average values shall be reported. 4.5.2 Dielectric strength, - 4.5.2.1 Test equipment. - The test equipment shall consist of a high voltage transformer rated at not less than 2 kilovolt-amperes
37、and the necessary auxiliary equipment for applying, controlling, and measuring the test voltage. The power supply shall consist of an alternating-current source having as nearly a true sine wave as possible at a frequency not exceeding 100 cycles per second. 4.5.2.2 Voltage control. - The high-tensi
38、onvolt- age taken from the secondary of the testing trans- former shall be capable of being raised gradually from any point, and in no case more than 500 volts at a step. The control may be made by generator field regulation with an induction regulator, or with a variable ratio autotransformer. Any
39、method of controlling the voltage which does not distort the wave more than 10 percent from a sinusoidal shape is satisfactory. 4-5.2.3 Voltage measurement. - The voltage may be measured by any method which gives root- mean-square values, preferably by means of a volt- meter connected to a tertiary
40、coil in the testing transformer, or to a separate step-down instrument potential transformer. A voltmeter on the low ten- sion side of the transformer is satisfactory if the ratio of the transformation does not change under any test condition. An electrostatic voltmeter properly calibrated in the hi
41、gh tension circuit is also satis- factory. A spark gap may be used to check the read- ings at very high potentials. 4.5.2.4 Medium and rate of voltage rise. - The tests shall be conducted in air by the short-time method. Starting at zero, the voltage shall be in- creased uniformly to a breakdown, at
42、 a rate of 500 volts per second. 4.5.2.5 Procedure - straight specimens. - A suf- ficient number of specimens 4 inches by 4 inches shall be cut to permit making 10 breakdowns after each of the following conditions: C-96/23/50 (on straight specimens). C-96/23/96 (on straight specimens). The test elec
43、trodes shall consist of metal cylinders 2 inches in diameter and not less than 1/2 inch in length with edges rounded to a radius of 1/4 inch, The total weight on the sample shall be approximately 1 pound. cient number of specimens 3 by 3-1/2 inches shallbe cut to permit making 10 breakdowns after ea
44、ch of the following conditions: 4.5.2.6 Procedure - bent specimens. - A suffi- C-96/23/50 (on specimens bent lengthwise). C-96/23/50 (on specimens bent crosswise). E-168/150 (on specimens bent lengthwise). The specimens shall be bent 90 degrees in the V- shaped jig shown on figure 1. Breakdowns shal
45、l be made using 90-degree, V-shaped electrodies designed to hold the specimens in a bent position. These elec- trodes are shown on figure 2. All edges o the bend- in jig and electrodes are rounded to approximately IA4 inch radius. Oven aged specimens shall be clamped on a rectangular aluminum channe
46、l to hold them in a bent position during aging. After aging, the channels shall be removed from the oven and allowed to return to room condition. The specimens shall then be removed from the channel and short-time breakdowns made using the V-shaped electrodes. 5 Provided by IHSNot for ResaleNo repro
47、duction or networking permitted without license from IHS-,-,-6 Test /- I, Requirement paragraph Thickness, condition Dielectric 1 strength: Straight, condition Straight, condition Bent length- wise, con- dition Bent cross- wise, con- dition Bent length- wise, con- dition E-168/ 150 C-96/23/50 C-96/2
48、3/50 C -9 6/2 3/9 6 C-96/23/50 C-96/23/50 Volume re- sistivity , condition C-96/23/96 Tensile strength: Lengthwise , condition .C- 9 6/23/50 Crosswise condition Tear resis- tance (slot cell): Lengthwise, condition Crosswise, condition Delamination , condition E96 /i 80 Absorbency, condition A C-96/2
49、3/50 C-96/23/50 C-96/23/50 3.2 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 33 3.3 3.3 3.3 002bb05 4 W .ce tests. Test reference 4.5.1 4.5.2 4.5.2 4.5.2 4.5.2 4.5.2 4.5.3 4.5.4 4.5.4 4.5.5 4.5.5 4.5.6 4.5.7 Minimum number of determina- tions per sample 10 10 10 10 10 10 3 5 5 3 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 1 - Bending jig 90“ v-shaped 4.5.2.7 Calculation of dielectric strength. - The diele
