NEMA RE 2-1999 Electrical Insulating Varnish《电绝缘清漆》.pdf
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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA RE 2-1999Electrical Insulating Varnish- STDmNEMA RE 2-ENGL 1999 b470247 0527818 555 NEMA Standards Publication No. RE 2-1999 Electrical Insulating Varnish Published by National Electrical Manufacturers Association 1300 North
2、 17th Street, Suite 1847 Rosslyn, VA 22209 O Copyright 1999 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the
3、International and Pan American Copyright Conventions. STD-NEMA RE 2-ENGL 1797 U 6470247 0527839 493 111 RE 2-1999 Page i Table of Contents Page Section 1 REFERENCED STANDARDS AND DEFINITIONS 1 1.1 Referenced Standards . 1 1.2 Definitions 2 Section 2 GENERAL 5 2.1 General Information . 5 2.2 Safety P
4、recautions . 5 2.3 Packaging Specifications Military Markings . 6 Section 3 PRODUCT PROPERTIES . 7 3.1 Required 7 3.2 Additional . 7 3.3 Military 7 3.4 Disclaimer Paragraph 7 Section 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.1 1 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 TEST METHODS
5、9 Bond Strength-Helical Coil Method 9 Bond-Strength-Twisted Coil Method 11 Chemical Strength of Electrical Insulating Varnish 14 Dissipation Factor-Varnish Magnet Wire . 18 Drying Time . 19 Film Build . 19 Flash Point . 20 Gel Time 21 Refrigerant Resistance/Extractables . 22 Monomer Content 24 Nonvo
6、latile Matter-Solvent Varnishes 25 Permittivity (Dielectric Constant) and Dissipation Factor . 26 Specific Gravity 27 Thermal Aging-Helical Coil 32 Thermal Aging-Non-Enameled Rectangular Insulated Magnet Wire 33 Thermal Aging-Twisted Pairs 36 Varnish Adjustment Procedure 37 Varnish Compatibility . 3
7、8 Dielectric Breakdown Voltage 15 Dielectric Strength of Solvent or Solventless Varnishes 17 Thermal Aging-Curved Electrode 28 . Viscosity, Brookfield 38 Annex A NEMA RE-2 Specification Sheets 41 RE 2-1 999 Page iii FOREWORD This Standards Publication is intended to assist those responsible for the
8、design of new and the repair of existing electrical equipment. This Standards Publication was developed by the Electrical Insulating Resins Section of the National Electrical Manufacturers Association. In the preparation of this Standards Publication input of users and other interested patties has b
9、een sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be submitted to the concerned NEMA product subdivision by contacting the: Vice President, Engineering Department National Electrical Manufacturers Association 1300 N. 17th Street, Suite 1847 Rosslyn, VA 22209
10、 At the time it was approved, the Section was composed of the following members: Arnoco Polymers, Inc.-Alpharetta, GA Bentley-Harris Manufacturing Co.-Mon, PA EI Dupont De Nemours environmental chamber for elevated temperature 4.1.3 Required Specimen The test specimen shall consist of helical coils
11、which have been dipped and cured with the varnish being tested. 4.1.4 a. b. C. d. 4.1 .!i Req u red Procedure Five coils, 3 inches in length, are prepared by winding 18 AWG magnet wire on a 0.250 inch mandrel. The coils are dipped in solventless, or solvent type varnish which has been previously adj
12、usted in accordance with 4.0. The coils are withdrawn from the varnish at a rate of 4 inches per minute, drained for 10 minutes and then baked according to the manufacturers recommendation. The coils treated with solvent varnish are then reversed, dipped, and baked, using the above procedure. Coils
13、treated with solventless varnish are only single dipped. The 3 inch helical coil shall be placed in the test fixture (see Figure 4-1 with regard to all dimensions shown). The fixture shall be attached to a machine equipped with a drive which has a crosshead speed of 2 inches per minute and a suitabl
14、e instrument for measuring the force used in breaking the specimen. Bond strengths shall be detemined at any temperature mutually agreed upon between buyer and seller. Elevated Temperature Bond Strength When bond strengths are measured at elevated temperatures, the environmental chamber shall enclos
15、e the test fixture without inhibiting the movement of the measuring device. The temperature in the chamber shall be maintained within f 2C of the desired temperature. The specimens shall be exposed for 6 minutes (I 1 minute) at the desired temperature prior to breaking, in accordance with the proced
16、ures in 4.1.4. Previous page is blank. RE 2-1 999 Page 10 4.1.6 Required Report The following shall be reported: a. Varnish b. Magnet wire type and manufacturer c. Cure time and temperature d. Test temperature e. Average bond strength Wo V Block Radius at Apex is -_ Figure 4-1 TEST FIXTURES FOR BOND
17、 STRENGTH STD-NEMA RE 2-ENGL 1777 II b470247 0527832 925 RE 2-1999 Page 11 4.2 BOND STRENGTH-TWISTED COIL METHOD 4.2.1 General The Twisted Coil Method is used in evaluating bond strength of solventless insulating varnishes. 4.2.2 Required Apparatus The following apparatus shall be used: a. Varnish t
18、o be tested b. Enameled wire, 28 AWG heavy build c. Coil winding jig, as shown in Figure 4-2 d. Coil twister, as shown in Figure 4-3 e. Dipping apparatus “Dip Coater-Fisher Payne or equivalent f. Forced draft oven g. Test fixture and machine, environmental chamber for elevated temperature 4.2.3 Requ
19、ired Specimen The test specimens shall consist of five twisted coils which have been dipped and cured with the vamich be- ing tested. 4.2.4 Required Procedure The following procedure shall be followed: a. b. C. d. e. f. 9. h. 4.2.5 Individual twisted coils are formed using 100 loops of 28 AWG enamel
20、ed wire. The 100 loops are made by using wire from two spools wrapped 50 times or one spool wrapped 1 O0 times around the mandrel as shown in Figure 4-2. Pull the double strands of wire from the center mandrel through one of the slots and secure the ends around one of the wing nuts on the front plat
21、e. Wind 1 O0 turns of wire around the mandrel. After winding, cut the strands leaving about 6 inches of unwound wire. Use this extra length to secure one side of the coil by making four or five loops around the coil. Use the strands from the wing nut to secure the opposite side of the coil by making
22、 four or five loops around the coil. Remove the front plate and then remove the coil. By hand, elongate the coil until an elliptically shaped coil is formed. Using a coil twister, as shown in Figure 4-3, twist the elliptical coil two and one half complete turns to produce a tight twisted coil. If th
23、e loops are loose, do not use the coil. Required Dipping and Curing Single dip the coils as follows: Submerge the coil horizontally and hold until bubbling stops. Withdraw at a rate of 4 inches per minute. Let the coil drain for 10 minutes in the horizontal position and then cure in accordance with
24、the manufacturers instructions. Vacuum Pressure Impregnation (VPI) treatment shall be permitted for some products. STD.NEMA RE 2-ENGL L997 6470247 0527833 861 RE 2-1 999 Page 12 4.2.6 Testing Bond Strength Test the coil in the same manner and on the same test assembly as prescribed in 4.1 (see Figur
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