1、BRITISH STANDARD BS 3816:1989 Specification for Epoxy resin casting systems used for electrical insulating applications at power frequencies UDC 678.686:621.315.61:621.3.016.2:621.3.018.4:001.4BS3816:1989 This British Standard, having been prepared under the directionof the Plastics StandardsCommitt
2、ee, was published under the authority ofthe Board of BSI and comes intoeffect on 28February1989 BSI 08-1999 First published November1964 First revision February1989 The following BSI references relate to the work on this standard: Committee reference PLM/39 Draft for comment86/44061 DC ISBN 0 580 17
3、068 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics Standards Committee (PLM/-) to Technical Committee PLM/39, upon which the following bodies were represented: BEAMA Ltd. British Marine Industries Federation British Plastics
4、Federation British Telecommunications plc Electronic and Electrical Insulation Association (BEAMA Ltd.) Engineering Equipment and Materials Users Association ERA Technology Ltd. Ministry of Defence Process Plant Association Royal Institute of British Architects Society of British Aerospace Companies
5、 Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Electronic Engineering Association Federation of Resin Formulators and Applicators Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS3816:1989 BSI 08-1999 i
6、Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Composition 1 4 Properties 1 5 Marking 1 Appendix A Preparation of castings for testing 2 Table 1 Property requirements of castings 1 Publications referred to Inside back coverBS3816:1989 ii BSI 08-1999 F
7、oreword This British Standard has been prepared under the direction of the Plastics Standards Committee and is a revision of BS3816:1964, which is withdrawn. It covers epoxy resin casting systems used as electrical insulation in equipment for the generation, transmission and distribution of electric
8、al power. The property requirements for the material are based on a cured epoxy resin casting system incorporating an inorganic filler. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.
9、 Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
10、have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3816:1989 BSI 08-1999 1 1 Scope This British Standard specifies requirements for epoxy resin casting systems used as electrical insulation in equipment for the generation, transmission and dis
11、tribution of electrical power. It does not apply to materials used in instrument transformers, gas-insulated equipment or insulators which are directly exposed to outdoor environments. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions
12、For the purposes of this British Standard the following definitions apply. 2.1 batch an identifiable quantity of basic ingredient, e.g.resin, hardener, filler, designated by the supplier and being substantially uniform in quality 2.2 blend a total quantity of casting material in which the same batch
13、es of ingredients are used throughout in the same proportions with the same processing conditions 2.3 casting the cured product from the reaction between the components of the epoxy resin casting system 3 Composition The casting system shall comprise an uncured epoxy resin incorporating an inorganic
14、 filler, additives and hardeners. 4 Properties Castings prepared as described in Appendix A shall comply with the requirements given in Table 1 when tested by the methods specified therein. 5 Marking The following information shall be marked on, if practicable, or given in relation to each casting:
15、a) the name or trade mark of the manufacturer; b) the manufacturers code reference for the casting; c) the number and date of this British Standard, i.e.BS3816:1989 1) . Table 1 Property requirements of castings 1) Marking BS3816:1989 on or in relation to a product represents a manufacturers declara
16、tion of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of con
17、formity, which may also be desirable. Property Requirement BS2782 method Flexural strength Flexural modulus Temperature of deflection under load Electric strength at23 C Power factor, at50Hz and23 C Permittivity, at50Hz and23 C Water absorption 110MPamin. 9GPamin. 110Cmin. 10kV/mmmin. 0.02max. 5max.
18、 15mg max. 335A 335A 121A 221A 240A 240A Use specimens cut from sheet3mm thick and otherwise prepared in accordance with 5.3 of BS2782:Method430A:1983 and test in accordance with method1 in 6.2 of that standardBS3816:1989 2 BSI 08-1999 Appendix A Preparation of castings for testing A.1 Epoxy resin c
19、asting system Mix batches of the ingredients of the epoxy resin casting system in the same proportions, and as nearly as possible under the same conditions (including any vacuum treatment to remove entrapped air), to form the same blend used for the manufacture of casting. A.2 Test castings Cast all
20、 test castings under as nearly as possible the same conditions used for production castings. Produce the castings in closed moulds so designed that the casting system is poured into the gap which will constitute either one edge, or part of an edge, of sheet samples or one end of rod samples. If need
21、ed, apply a mould release agent recommended by the resin supplier to all surfaces of the mould coming into contact with the casting system. To reduce the risk of air entrapment in the casting incline the mould at an angle of about30 from the vertical whilst slowly pouring the casting resin onto the
22、inner surface of the lower face of the mould cavity. Cure the test castings under as nearly as possible the same conditions as the production castings.BS3816:1989 BSI 08-1999 Publications referred to BS2782, Methods of testing plastics. BS2782-1, Thermal properties. BS2782:Method121A, Determination
23、of temperature of deflection under a bending stress of1.8MPa, of plastics and ebonite. BS2782-2, Electrical properties. BS2782:Method221A, Determination of electric strength: step-by-step method 2) . BS2782:Method240A and240B, Determination of loss tangent and permittivity at power and audio frequen
24、cies. BS2782-3, Mechanical properties. BS2782:Method335A, Determination of flexural properties of rigid plastics. BS2782-4, Chemical properties. BS2782:Method430A, Determination of water absorption at23 C 3) . 2) Included in BS2782:Methods220 and221 3) Included in BS2782:Methods430A to430DBS 3816:19
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