BS 7383-1990 Specification for cold-pour resin-based compound for use as a filling medium in terminating cables in enclosures for voltages not exceeding 11 kV for use in coal mines.pdf

1、BRITISH STANDARD BS7383:1990 Specification for Cold-pour resin-based compound for use as afilling medium in terminating cables in enclosures for voltages not exceeding11kV for use in coal minesBS7383:1990 This BritishStandard, having been prepared under the directionof the Mining and Quarrying Requi

2、sites StandardsPolicy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31December1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference MQE/14 Draft for comment89/72979DC ISBN 0 580 19087 0 Committees responsible f

3、or this BritishStandard The preparation of this BritishStandard was entrusted by the Mining and Quarrying Requisites Standards Policy Committee (MQE/-) to Technical Committee MQE/14, upon which the following bodies were represented: Association of British Mining Equipment Companies British Cable Mak

4、ers Confederation British Coal Corporation Council for Electrical Equipment for Flammable Atmospheres (BEAMA Ltd.) Health and Safety Executive Institution of Mining Electrical and Mining Mechanical Engineers Rotating Electrical Machines Association (BEAMA Ltd.) Transmission and Distribution Associat

5、ion (BEAMA Ltd.) Amendments issued since publication Amd. No. Date CommentsBS7383:1990 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Form of supply 1 3 General properties of the compound 1 4 Type tests 1 5 Marking 3 Appendix A Guidance on pouring and c

6、uring times 4 Appendix B Minimum information to be provided by the manufacturer on data sheets 4 Appendix C Flammability test 4 Appendix D Electrical discharge test 4 Appendix E Torsion test 8 Appendix F Moisture sealing tests 8 Figure 1 Test cell for insulation resistance and electric strength test

7、s 2 Figure 2 Cabinet for flame test 5 Figure 3 Layout of apparatus for flammability test 6 Figure 4 Electrical discharge test cell 7 Publication(s) referred to Inside back coverBS7383:1990 ii BSI 12-1999 Foreword This BritishStandard has been prepared under the direction of the Mining and Quarrying

8、Requisites Standards Policy Committee. It covers the requirements for a resin-based compound used as a cold-pour filling medium and provides for an alternative to the bituminous compounds specified in BS1858. Such a compound is supplied in a kit form capable of being used above or below ground. Purc

9、hasers ordering in accordance with this standard are advised to specify in their purchasing contract that the manufacturer operates a quality system in compliance with the appropriate Part of BS5750, or suitable equivalent, to ensure themselves that products claimed to comply with this standard cons

10、istently achieve the required level of quality. Product certification. Users of this BritishStandard are advised to consider the desirability of third party certification of product conformity with this BritishStandard based on testing and continuing surveillance, which may be coupled with assessmen

11、t of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider appr

12、oaching an appropriate body from the list of Association members. 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. Compliance with a British Standard does not of itself confer immunity

13、 from legal obligations. Attention is drawn to the Health and SafetyatWorketc. Act1974, the Mines and Quarries Act1954, the Regulations made under these Acts, and also any other appropriate statutory requirements or byelaws. These place responsibility for complying with certain specific safety requi

14、rements on the manufacturer and the user. The address of the recognized certification authority in the United Kingdom for Group I (coal mining) apparatus for flameproof purposes is as follows: Health and Safety Executive Mining Equipment Certification Service Harpur Hill Buxton Derbyshire SK179JN Su

15、mmary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside fron

16、t cover.BS7383:1990 BSI 12-1999 1 1 Scope This BritishStandard specifies the form of supply, properties and type tests for a resin-based compound supplied in kit form, suitable as a cold-pour filling medium when terminating electric cables in enclosures primarily used in mines; in particular, but no

17、t exclusively, for cable couplers complying with BS3454, BS3905 and BS7019. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Form of supply 2.1 The compound shall be supplied in kit form which shall have a declared “use by” date and a minimum she

18、lf life of12months. The kit shall consist of matched quantities of constituents supplied in a single container capable of being used as a mixing vessel. The kit shall contain the storage, mixing, safe use and disposal instructions, any necessary disposable protective clothing for use and, where appl

19、icable, a mixing implement. NOTE 1The manufacturer should ensure that all the packages in which the compound constituents are supplied, and the information given in these packages, comply with the Classification, Packaging and Labelling of Dangerous Substances Regulations1984, where applicable. NOTE

20、 2The manufacturer should make available all such information concerning the compound as will enable the purchaser to use the constituents in a safe manner in accordance with the requirements of the Health and Safety at Work, etc. Act1974 and to dispose of unwanted compound and used containers in ac

21、cordance with the requirements of the Control of Pollution Act1974. 2.2 When the container is metallic, the material shall be one of the following: a) a corrosion resistant ferrous alloy; or b) a non-ferrous metal, other than aluminium, magnesium, or titanium; or c) an alloy containing the metals al

22、uminium, magnesium, titanium, either singly or in combinations, providing that the total content of these three constituents does not exceed15% by mass of the alloy and the combined content of magnesium and titanium does not exceed6% by mass of the alloy. NOTEThese limits have been imposed to avoid

23、the hazards of incendive sparking due to friction between rusted steel or iron and the metals referred to. 3 General properties of the compound NOTEThe manufacturer is to provide, when required, data on the properties of the compound and its constituent parts as given in Appendix B. A requirement fo

24、r a data sheet should be specified on the enquiry and/or order. 3.1 The compound shall comply with clause4. NOTEThe compound should be compatible with the component parts of the cable terminating system and it is incumbent upon the purchaser to consult the manufacturer to ensure compatibility. 3.2 W

25、hen constituent parts of the compound are added together in the proportions supplied by the manufacturer, and following his instructions, they shall be capable of being mixed and poured throughout the ambient temperature range5 C to+40 C. NOTEThe compound will be more difficult to pour and require l

26、onger curing times at the lower end of the temperature range. Appendix A gives guidance on pouring and curing. 3.3 The maximum temperature of the exothermic reaction resulting from mixing when tested in accordance with item c) of6.3.1 of BS6910-1:1988 shall not exceed80 C. 3.4 Polyurethane resin fil

27、ling systems shall have a vapour pressure of less than6.66 10 3Pa(5 10 5 mmHg) measured at25 C. NOTEIsocyanates are basic constituents used in the production of polyurethanes and are covered by the Control of Substances Hazardous to Health (COSHH) Regulations1988. The concentration of isocyanate in

28、the atmosphere arising from polyurethane resin filling systems when used in accordance with the suppliers recommendations should not exceed the maximum exposure limits specified in the current Health and Safety Guidance NoteEH40 “Occupational Exposure Limits”. 4 Type tests 4.1 Material property test

29、s 4.1.1 General Type tests on prepared samples of the compound shall be carried out in accordance with4.1.2 to4.1.8. 4.1.2 Insulation resistance Using a cell as shown in Figure 1, the insulation resistance of the mixed compound shall be determined between9min and11min after the addition of the harde

30、ner at an ambient temperature of22 2 C. The insulation resistance at12kV d.c. shall be not less than100M7. BS7383:1990 2 BSI 12-1999 4.1.3 Volume resistivity When tested in accordance with BS2782-2:Method230A the volume resistivity of the compound after full cure shall be not less than1 10 13 7cm. 4

31、.1.4 Electric strength Using a cell as shown in Figure 1, the electric strength of the mixed compound shall be determined10min after the addition of the hardener at an ambient temperature of22 2 C. An increasing a.c. voltage of approximately sine-wave form, having a frequency of40Hz to62Hz shall be

32、applied at a rate of2kV/s, starting from zero, until breakdown occurs. Three such determinations shall be made and the arithmetic mean taken as the breakdown value. The electric strength shall be not less than8kV/mm. 4.1.5 Water absorption When tested in accordance with BS2782-4:Method430A the water

33、 absorption of the compound after full cure shall not exceed50mg. 4.1.6 Thermal conductivity When tested in accordance with BS874 the thermal conductivity of the compound after full cure shall be not less than0.65W/(mK). 4.1.7 Flammability When tested in accordance with Appendix C, the compound, aft

34、er cure, shall meet the following criteria. For the six test pieces and any molten drops, the average time for all flame or glow to disappear after withdrawal of the burner shall not exceed20s. No individual test piece shall flame or glow for more than30s. 4.1.8 Electrical discharge After full cure

35、the compound shall be tested in accordance with Appendix D and shall meet the following criteria. a) When tested as described inD.2 the partial discharge magnitude shall not exceed50pC. b) When tested as described inD.3 the partial discharge magnitude shall not exceed5pC. 4.2 Application tests 4.2.1

36、 General Application tests of the compound as a filling medium shall be carried out in accordance with4.2.2 and4.2.3 using cable couplers complying with BS3454 and BS3905 or with BS7019 as the enclosures. 4.2.2 Curing characteristics The curing characteristics at an ambient temperature of22 2 C shal

37、l be such that when the torsion test described in Appendix E is applied to the filled coupler relative to the cable the following criteria shall be met. a) During twisting there shall be no visible movement of the armour wires of the cable in the clamp at the coupler end, nor of the cable relative t

38、o the cable clamp at the remote end. NOTEWith an unsatisfactory compound this test has the effect of lengthening the cores and exerting substantial forces causing possible displacement and/or knuckling of the cable cores. b) When subjected to the post-test examination, there shall be no visible disp

39、lacement of the cores inside the coupler in the region between the crotch area of the cable up to the conductor termination socket. Figure 1 Test cell for insulation resistance and electric strength testsBS7383:1990 BSI 12-1999 3 4.2.3 Moisture sealing Part filled couplers shall be tested for moistu

40、re sealing in accordance with Appendix F. Theminimum insulation resistance measured throughout the test shall not fall below6 10 4 M7. 5 Marking 5.1 Kit container The kit container shall be legibly and durably marked on the outside with the following: a) the manufacturers description; b) the number

41、and date of this BritishStandard, i.e.BS7383:1990 1) ; c) the batch number; d) the use by date; e) the name and address of the manufacturer; f) any necessary warning symbols, risks and safety phrases; g) any third party certification details; h) the kit quantity; i) a statement which warns users not

42、 to mix the components of the kit with components from other manufacturers kits. j) the statement “NOT TO BE LEFT UNDERGROUND”. 5.2 Resin and hardener containers The resin and hardener containers shall be legibly and durably marked on the outside with the following: a) a statement which warns users

43、not to mix the components of the kit with components of other manufacturers kits; b) any special instructions and precautions necessary to avoid hazard in preparation and pouring. 1) Marking BS7383:1990 on or in relation to a product represents a manufacturers declaration of conformity, i.e.a claim

44、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 conformity, which may also be desir

45、able.BS7383:1990 4 BSI 12-1999 Appendix A Guidance on pouring and curing times The mixed compound should pour easily at temperatures of the order of20 C. At low temperatures, e.g.down to5 C, the compound is more viscous and may not pour as readily, but the curing time will be extended due to the low

46、er temperatures, thus allowing a longer pouring period. At the higher temperatures, the converse applies. To prevent voids or layering of compound occurring during multi-kit usage, the manufacturers instructions on mixing and pouring should be adhered to strictly. To obtain near optimum mixing and p

47、ouring conditions, the kits, prior to use, should be at a temperature of20 2 C. If the temperature at the mixing and pouring site is less than10 C or greater than30 C, the kit should not be taken to the site until ready for use. Appendix B Minimum information to be provided by the manufacturer on da

48、ta sheets When required, the manufacturer is to provide data sheets containing at least the following information and including test methods if not given in this standard: a) the shelf life; b) the mix ratio of the constituent parts; c) the appearance of the constituent parts, e.g.colour; d) the ful

49、l cure time; e) the maximum exothermic temperature; f) the volume shrinkage during cure; g) the water absorption; h) the volume resistivity; i) the thermal conductivity; j) the electrical strength of the resin after7days; k) the oxygen index. Appendix C Flammability test C.1 Apparatus C.1.1 Spirit burner, complying with the constructional requirements of section2 of BS5865:1980. C.1.2 Suitable stand with clamp, to hold the test piece in the required position. C.1.3 Draught-free cabinet, complying with Figure 2. C.1.4 Flat metal tray