BS DD IEC TS 62371-2008 Characteristics of hollow pressurised and unpressurised ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1000 V.pdf

1、DRAFT FOR DEVELOPMENTDD IEC/TS 62371:2008Characteristics of hollow pressurised and unpressurised ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1000 VICS 29.080.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g

2、50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD IEC/TS 62371:2008This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 61281 7National forewor

3、dThis Draft for Development is the UK implementation of IEC/TS 62371:2008.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that inform

4、ation and experience of its practical application can be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publicatio

5、n will be initiated not later than three years after its publication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.According to the replies r

6、eceived by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committe

7、e at British Standards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee PEL/36, Insulators for power systems.A list of organizations represented on this committee can be obtained on request to its secretary.This publication doe

8、s not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Amendments/corrigenda issued since publicationDate CommentsIEC/TS 62371Edition 1.0 2008-05TECHNICAL SPECIFICATIONCharacteristics of hollow pressurised and unpressurised ceramic and

9、glass insulators for use in electrical equipment with rated voltages greater than 1000 VCONTENTS INTRODUCTION.3 1 Scope.4 2 Normative references .5 3 Terms and definitions .5 4 Dimensional and mechanical characteristics.6 5 Marking 7 6 Fixing arrangement.7 7 Designation of hollow insulators .7 Bibli

10、ography20 Figure 1 Example of a straight type hollow insulator with metal fittings on both ends .16 Figure 2 Example of a taper type hollow insulator with metal fittings on both ends .17 Figure 3 Example of a straight type hollow insulator without metal fittings18 Figure 4 Example of a taper type ho

11、llow insulator without metal fittings .19 Table 1 Straight type hollow insulators with metal fittings on both ends9 Table 2 Taper type hollow insulators with metal fittings on both ends.10 Table 3 Straight type hollow insulators without metal fittings12 Table 4 Taper type hollow insulators without m

12、etal fittings.14 DD IEC/TS 62371 2 INTRODUCTION The IEC standards concerning insulators for overhead lines and substations are classified into two categories. One is the standard for test methods and acceptance criteria and the other is the product standard in which characteristics of the insulators

13、 are specified. Product standards of most insulators, for example cap and pin type, long rod type insulators for overhead lines and station post insulators for substations, are available. In the case of hollow insulators, test methods and acceptance criteria are standardized in IEC 62155: Hollow pre

14、ssurized and unpressurized ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1 000 V, but there has been no product standard. This seems due to the difference in application among hollow insulators and other insulators. The hollow insulators are usually ap

15、plied as a component of electrical equipment and other insulators such as cap and pin type or station post insulators are directly applied to the power system as equipment. There are benefits for standardization of the hollow insulators, even if they are used as components, for insulator manufacture

16、rs, equipment manufacturers and final users for the equipment. That is, benefits of cost saving in respect of manufacturing and inventory control, short delivery, interchangeability, etc. Taking account of every aspect on standardization of the hollow insulators, such as the fact that there are so m

17、any designs of electrical equipment, this Technical Specification covers only basic hollow insulators for normal application as a first step towards standardization work. Accordingly, special types of hollow insulators such as barrel type for some circuit-breakers, insulators for pollution and/or se

18、ismic areas, etc. are not within the scope of this specification. Therefore, different hollow insulators not included in this specification can also be applied to the electrical equipment in the case where special characteristics are required, depending on environmental and/or system conditions. The

19、re may be the possibility to standardize those hollow insulators as a next step after gathering sufficient information on experiences. In addition, it should be noted that the characteristics specified here are determined, considering the data collected through the survey on the presently available

20、hollow insulators. There may be the possibility that the survey is not complete and then the hollow insulators not covered by this technical specification can also be applied. Such insulators as widely applied but not covered by this technical specification will be added in the next revision through

21、 ascertained experiences. DD IEC/TS 62371 3 CHARACTERISTICS OF HOLLOW PRESSURISED AND UNPRESSURISED CERAMIC AND GLASS INSULATORS FOR USE IN ELECTRICAL EQUIPMENT WITH RATED VOLTAGES GREATER THAN 1000 V 1 Scope This Technical Specification applies to ceramic and glass hollow insulators intended for ge

22、neral use in electrical equipment; ceramic hollow insulators intended for use with a permanent gas pressure in switchgear and controlgear. They are intended for indoor and outdoor use in electrical equipment, operating on alternating current with a rated voltage greater than 1 000 V and a frequency

23、not greater than 100 Hz or for use in direct current equipment with a rated voltage greater than 1 500 V. This specification specifies the dimensional and mechanical characteristics of the hollow insulator, which are essential for interchangeability of the hollow insulator of the same type. It is no

24、t the object of this specification to prescribe electrical characteristics because they are dependent on the apparatus of which the hollow insulator ultimately forms a part. However, standard lightning impulse withstand voltage which is provided in IEC 60071-1 is described only for reference for cla

25、ssification purpose. This specification applies to hollow insulators for use in electrical equipment in clean areas or lightly polluted areas, where seismic qualification is not required. For use in areas characterised by heavy pollution levels and for other particular or extreme environmental condi

26、tions such as seismic force, it may be necessary for certain dimensions to be changed. The hollow insulators covered by this specification are: a) straight type hollow insulators with metal fittings on both ends; b) taper type hollow insulators with metal fittings on both ends; c) straight type holl

27、ow insulators without metal fittings; d) taper type hollow insulators without metal fittings. The hollow insulators are intended for use in electrical equipment, for example: circuit-breakers; instrument transformers; surge arresters; bushings; cable sealing ends; switch-disconnectors; disconnectors

28、; earthing switches; capacitors. There may be some cases that hollow insulators whose design can strongly be influenced by other components of specific equipment, for example, active parts of circuit-breakers. For such cases, the hollow insulators can be separately designed, depending on respective

29、requirements of such equipment and not be covered by this specification. DD IEC/TS 62371 4 NOTE 1 Hollow insulators not prescribed in this specification can also be applied to electrical equipment, depending on specific requirements of the equipment. However, if similar insulators are available in t

30、his specification, it is preferable to apply them. NOTE 2 For general recommendations for design and tests of the hollow insulators, see IEC 62155. NOTE 3 For characteristics of hollow insulators for use in polluted areas, reference can be made to IEC 60815-1and IEC 60815-2. 2 Normative references T

31、he following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62155, Hollow pressurized and unpressurized ce

32、ramic and glass insulators for use in electrical equipment with rated voltages greater than 1000 V 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 arcing distance shortest distance in air external to the insulator between the metallic parts w

33、hich normally have the operating voltage between them IEV 471-01-01 3.2 creepage distance shortest distance along the external surface on an insulator between two conductive parts which normally have the operating voltage between them IEV 471-01-04, modified NOTE 1 The surface of cement or of other

34、non-insulating jointing material is not considered as forming part of the creepage distance. NOTE 2 If a high resistance coating is applied to parts of the insulating part of an insulator, such parts are considered to be effective insulating surfaces and the distance over them is included in the cre

35、epage distance. NOTE 3 In case of hollow insulators without metal fitting, creepage distance is the shortest distance along the external surface on an insulator between the presumed position of two conductive parts as shown in Figures 3 and 4, unless otherwise agreed between the purchaser and the ma

36、nufacturer. 3.3 end fitting integral component or formed part of an insulator, intended to connect it to a supporting structure, or to a conductor, or to an item of equipment, or to another insulator IEV 471-01-06 NOTE Where the end fitting is metallic, the term “metal fitting” is normally used. 3.4

37、 hollow insulator insulator which is open from end to end, with or without sheds, including end fittings IEV 471-01-08 NOTE 1 A hollow insulator can be made from one or more permanently assembled insulating elements. DD IEC/TS 62371 5 NOTE 2 Hollow insulators without end fittings are embraced. 3.5 m

38、anufacturer organisation that produces the hollow insulators or hollow insulator bodies 3.6 straight type hollow insulator hollow insulator which has the same inner and outer diameters from the top to the bottom 3.7 taper type hollow insulator hollow insulator which has increasing inner and outer di

39、ameters from the top to the bottom 3.8 withstand bending moment bending moment verified in a type test, which is based on load conditions specified for the hollow insulator 3.9 withstand inner pressure load inner pressure load verified in a type test, which is based on load conditions specified for

40、the hollow insulator 4 Dimensional and mechanical characteristics Hollow insulators are characterized by the following: height of hollow insulator; arcing distance; creepage distance; diameter of insulating part; inner diameter of hollow insulator; withstand bending moment (when required); withstand

41、 inner pressure load (when required); pitch circle diameter of end fittings (only for flange type); diameter of clamping part (only for clamping type); number of bolt holes (only for flange type). Where applicable, fixing holes shall be equally spaced on the appropriate pitch circle, which shall be

42、concentric with the axis of the insulator. Holes in top and bottom fittings shall be in line, unless otherwise specified, and they shall be so arranged as to permit the use of normal hexagon bolt heads and nuts. The corresponding values are specified in Tables 1 to 4. Each table corresponds to each

43、hollow insulator type as follows: Table 1: straight type hollow insulators with metal fittings on both ends; Table 2: taper type hollow insulators with metal fittings on both ends; Table 3: straight type hollow insulators without metal fittings; Table 4: taper type hollow insulators without metal fi

44、ttings. Figures 1 to 4 illustrate typical examples of each type of the insulator. DD IEC/TS 62371 6 The nominal dimensions of a hollow insulator shall be not greater than the specified maximum nor less than the specified minimum values. The actual dimensions of insulators are subject to the appropri

45、ate manufacturing tolerances. The tolerances of the hollow insulator shall be in accordance with 7.1 of IEC 62155 unless otherwise agreed between the purchaser and the manufacturer. 5 Marking Each hollow insulator shall be marked in accordance with 11.1 of IEC 62155. 6 Fixing arrangement The fixing

46、arrangements of hollow insulators shall be in accordance with Tables 1 to 4. 7 Designation of hollow insulators The hollow insulator is assigned by a reference symbol which indicates: DD IEC/TS 62371 7 * * - * * - * * -* - Inner diameter of the insulator at bottom: numerical figures in millimetres o

47、f diameter - Fixing structure: without metal fittings (e.g. clamping at both ends) designation C with metal fittings at both ends designation M - Shed shape: “standard” profile designation 1 “anti-fog” profile designation 2 “alternating” profile designation 3 “open” profile designation 4 - Height of

48、 hollow insulator: numerical figures in millimetres of length - Type of insulator: straight designation S, taper designation T - Material: ceramic designation P, glass designation G NOTE For type of shed shape, IEC 60815-1 can be referred to. For example, designation PT-3350-1M-390 stands for cerami

49、c taper type hollow insulator with a height of 3 350 mm, standard profile sheds, with metal fittings at both ends and inner diameter of 390 mm at the bottom. DD IEC/TS 62371 8 Table1Straight typehollowinsulatorswithmetalfittingsonboth ends1 2 3 4 5 6 7 8 9 10 11 12 MetalfittingpitchcirclediameterNumber ofboltholes ofmetal fittingdHollowinsulatordesignationaLightning impulse withstand voltagebkVHeightofhollowinsulatormmMinimum arcing distance mmMinimum nominal creepage distance mmMaximum nominal