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1、J I S C*:2103 91 4933608 0500744 8 = IS UDC 621.31 5.61 7.3:667.633.26.001.4 JAPANESE INDUSTRIAL STANDARD Testing methods of varnishes for electrical insulation Translated and Published bY Japanese Standards Association Printed in Japan 17 S Copyright Japanese Standards Association Provided by IHS u
2、nder license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS CE2L03 92 4933b08 0500745 T I In the event of any doubt arising, the original Standard in Japanese is to be fina
3、l authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*ZL03 91 4933608 0500746 I W Test item
4、 UDC 621.315.617.3:667.633.26.001.4 JAPANESE INDUSTRIAL STANDARD J I S Testing methods of varnishes for C 2103-1991 electrical insulation 1. Scope This Japanese Industrial Standard specifies the testing methods of varnishes and enamels for electrical insulation (hereafter referred to as the “varnish
5、es“). Remarks 1. The applicable standards to this Standard are shown in Attached Table 1. 2. The International Standard corresponding to this Standard is shown below: IEC 464-2 (1974) Specification for insulating varnishes containing solvent Part 2 : Test methods . 3. The units and numerical values
6、given in 1 in this Standard are based on the traditional units and are appended for informative reference. 2. Classification of test This Standard covers the tests enumerated in Table 1. Table 1. Classification of test Appearance Specific gravity Viscosity Non-volatile content Acid value Stability T
7、hinning easiness Film adhesion Drying time Bubbling Internal hardening Applicable clause Test item Applicable clause I I 6. Thermosoftening 17. 7. Volume resistivity 18. 19. Electric loss tangent and 8. specific inductive capacity 20. Dielectric breakdown strength 9. 10. I Arc resistance I 21. 11. I
8、 Flexibility . I 22. 23. Low temperature flexibility 12. Heating loss Oil resistance Change due to heating 26. 15. 16. Film bonding 27. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45
9、:29 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S CX2103 71 4733608 0500747 3 I 3. Conditions for Testing . 3.1 Atmospheric conditions The test shall be carried out at ordinary temperature and ordinary humidity specified in JIS Z 8703, i.e. at 20 * 15OC in temperatu
10、re and 65 t 2 0 % in humidity, unless otherwise specified. 3.2 Sampling method The test specimen shall be taken as follows: Designate the product of every manufacture number as one lot, and, at the time of sampling, stir the varnish of every lot thoroughly as needed, then take approximately 0.5 kg o
11、f test specimen in a clean container with care not to allow any impurity to enter the test specimen, and then store it as plugged hermetically in order to prevent the volatile matter from transpiration. r 3.3 Treatment of test specimens Keep the test specimens in a dark, cool place, as far as possib
12、le, until the commencement of tests. The tests of and the preparation of test specimen of liquid state shall be commenced within 72 h after.it is sampled. 4. Rounding-off of numerical values The observed values and the averages thereof obtained by the tests shall be rounded off to the digits given i
13、n Table 2 by the rules provided in JIS Z 8401, Table 2. Rounding-off of numerical values Test item To be rounded off to: Specific gravity 2 places of decimals Viscosity 2 significant figures Non-volatile content Acid value Film adhesion I Volume resistivity Electric loss tangent and specific inducti
14、ve capacity Dielectric breakdown strength Arc resistance 3 significant figures Heating loss 2 significant figures Film bonding 5. Test pieces 5.1 Base materials for test pieces The base materials for test pieces shall be as specified below. Copyright Japanese Standards Association Provided by IHS un
15、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- _ _ J I S C*:2103 91 = 4933608 0500748 5 = 3 C 2103-1991 (1) Metal sheets G 3141, JIS G 3303 or JIS G 4305. fault and
16、 shall measure the dimensions specified in Table 3 . The metal sheets shall be flat sheets specified in JIS They shall be free from visual Table 3. Size of metal sheets Unit: mm Size of metal sheet Width I Length I Thickness Test item Drying time Heating loss Oil resistance Change due to heating App
17、earance of dry film Film adhesion Approx . Approx. 50 180 Flexibility Volume resistivity Approx . Approx. Electric loss tangent and specific inductive capacity Dielectric breakdown strength 130 180 Note ( l ) The metallic sheet for flexibility test shall have 0.23 to 0.26 mm in thickness. (2) Piano
18、wires armature binding which is straight and free from any visual fault, and shall measure approximately 1.2 mm in diameter, and 50 2 1 mm and approximately 100 mm in length. (3) Pressboards Class 2 pressboards specified in JIS C 2305. They shall measure approximately 0.5 mm in thickness, 15 mm in w
19、idth and approximately 150 mm in length. Piano wire shall be the tin coated piano wire for (4) Annealed copper wires As specified in JIS C 3102. They shall be straight and free from any visual fault, and shall measure approxi- mately 0.2 mm in diameter and approximately 200 mm in length. (5) Glass s
20、heets As specified in JIS R 3201. They shall measure approximately 3 mm in thickness, approximately 130 mm in width and approximately 180 mm in length. (6) Glass fabrics JIS R 3414. treatment. Alkali-free fabrics EP 10 A or EP 10 B specified- in They shall have been subjected to heat cleaning Copyri
21、ght Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*:2103 91 4933608 0500749 7 4 C 2103-1991 5.2 Treatment o
22、f metallic base materials The metal sheets and piano . wires specified in 5.1 shall be polished well with abrasives finer than 44 um wetted with water so as not to have any adhering substance such as rust, etc., then washed well in running water and wiped with a clean cloth, dried in a thermostatic
23、oven kept at approximately 100C, and then stored in a desiccator containing solid desiccant. paint, clay, diatom earth or precipitated magnesium oxide, which do not contain any coarse grain, are recommendable. As the abrasives, red iron oxide for The metal sheets which have been coated with test spe
24、cimen can be reused, and, in this case, it is recommended to remove the coated film after being immersed in xylene, etc. for a short time. 5.3 Preparation of test pieces 5.3.1 Test pieces of metal sheet After measuring the thickness of metal sheets which have been treated in acccordance with 5.2, wi
25、pe them with a clean cloth wetted with ethylalcohol, acetone or xylene and dry, and then apply the test specimen onto them. lengthwise direction ( 2 ) , and, after leaving them uninterrupted at room temperature for 30 min, dry under the specified conditions ( 3). Suspend them in the Measure the thic
26、kness of varnish film thus coated, and adjust the No adjustment, however, is required for the test of concentration of the specimen so that the observed thickness lies within the specified value. film adhesion. Application of the test specimen shall be made as specified below and the number of times
27、 of application shall be as given in Table 4. (1) Application of varnish onto one side Allow the specimen to flow on the one side of metal sheet which is kept in oblique posture. (2) Application of varnish on both sides in the test specimen, and then draw out the sheet at a rate of approximately 0.0
28、2 m/s. In any case of (1) and (2) above, the suspension of the metal sheet shall be inverse in the flow direction of test specimen at the first and second time to make the thickness of coated film as even as possible. Notes ( 2, Immerse the metal sheet To hang the metal sheet, it is convenient to ma
29、ke a hole at a distance of approximately 3 to 4 mm from both ends in the longitudinal direction in the middle of width and then to attach a hook of twisted S form to the hole, as shown in Fig. 1, or to clip this portion with a paper clip of a suitable size. (3) In case that the specified heat-drying
30、 time exceeds 6 h and the continuous heating is not possible, the heating may be continued for 4 h or longer at the beginning, followed by intermittent heating for the remaining hour. The number of times of heating, however, shall not exceed 4. Copyright Japanese Standards Association Provided by IH
31、S under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S CX2103 91 4933b08 0500750 3 Fig. 1. Suspending method for hook and metal sheet .Suspension rod Unit: mm /or
32、 wire Side view Front view Table 4. Number of times of application Test item Number of times of application Appearance of coated film Film adhesion Volume resistivity Electric loss tangent and specific inductive capacity Dielectric breakdown strength Flexibility Drying time Oil resistance Change due
33、 to heating Heating loss 1 time on one side 2 times on one side 1 time on one side 2 times on both sides 5.3.2 Test pieces of piano wires Take 2 pieces each ofpiano wires having been treated in accordance with 5.2, make one end of long wire to butt gainst one end of the other long wire, as shown in
34、Fig. 2,-bring 2 short wires along with the both sides of long wire with their middles positioned at the butted point of long wires, wind lightly one annealed copper wire of approximately 0.2 mm in diameter around them so that it turns 10 times in one way and thereby 20 times in both ways. Apply the
35、varnish as it is of original concentration thoroughly onto the joint wound part with a brush, leave them uninterrupted horizontally at a room temperature for approximately 30 min, and then dry them under the specifi.ed, conditions. Copyright Japanese Standards Association Provided by IHS under licen
36、se with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- I JIS C*ZL03 91 4933608 0500753 5 I 6 C 2103-1991 Fig. 2, Test piece of piano wire Unit: mm Approx. 100 Approx. 100 18.6 formu
37、la : Calculation The calculation shall be made by the use of the following R XD2R -1.96 . - pu=7- t where, pV : volume resistivity (MQmm) D : diameter of main electrode (mm) R : t : thickness of coated film (mm) observed volume resistivity (MQ) X : ratio of circumference of circle to its diameter Co
38、pyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*E!103 91 m 4933bO 05007b3 L m I 18 C 2103-1991 18.7
39、Test report The test report shall include the following particulars: (1) (2) Coated film thickness (mm) Conditions for testing (type of test method) (3) Testing voltage (V) (4) Volume resistivity (Ma* m) 19. Test of electric loss tangent and pecific inductive cap rity - 19.1 Apparatus The apparatus
40、used shall be as specified below. (1) Measuring instrument Use the Schering bridge circuit shown in Fig. 19 given in JIS C 2101. shielded to protect itself from outside dielectricity, and shall be capable of getting the potential balance between the main circuit and the protection network. The measu
41、ring circuit shall be (2) Electrodes The electrodes used shall be as specified in Fig. 10 in shape and dimensions, and their types and the attachment shall be as given in 18.1. Fig. 10. Electrode Unit: mm Metal foil or coating Guard material film electrode (counter electrode) 19.2 Test pieces Having
42、 been prepared in accordance with 5.3.1. 19.3 Measurement of coated film thickness This measurement shall be made in accordance with 18.3. Conditions for testing 19.4 The test shall be made under the conditions specified below. (1) In case of normal state After the completion of drying, measure the
43、thickness of coated film, keep the test piece at a temperature of 25$: 5OG and a humidity not more than 70-% for 24 h, and then complete the test specified in 19.5 in air of 25 $: 5OC in temperature. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employee
44、s/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 21:45:29 MDTNo reproduction or networking permitted without license from IHS -,-,- I J I S C*:2103 91 4933608 05007bll 3 W 19 C 2103-1991 (2) In case of elevated temperature measure the thickness of coated film, put the test piece in a therm
45、ostatic oven kept at the specified temperature, and, after the oven reaches the specified temperature again, leave it still further for 10 min, and complete the test specified in 19.5 in the oven within 15 min. After the completion of drying, 19.5 Test method between the electrodes, apply AC 100 to
46、200 V of commercial frequency, and take the balance of bridge. Hold the test piece attached with the electrodes 19.6 Calculation The calculation shall be made by the use of the follow- ing formulas : tan 6 : xx C4R4 where, tan 6: electric loss tangent f : frequency of electric source for measurement
47、 (Hz) C4: R4: capacitance of arm by bridge balance (pF) resistance of arm by bridge balance (52) However, since generally the value 2z$R4 is equal to lo5, the eiectric loss tangent can be read directly from the value C , of variable condenser of Schering bridge. C C o E =- where, E : specific induct
48、ive capacity C: Co : capacitance (pF) at E =1 calcualted from area and capacitance of test piece obtained from bridge (pF) film thickness of main electrode, which can be obtained by the following formula: where, Y : radius of main electrode (mm) t : film thickness of test piece (mm) 19.7 Test report The test report shall include the following particulars: (1) Conditions for testing C category of testing conditions, testing voltage (V) , frequency (Hz) and temperature (OC) (2) Thickness of coat