1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21085-4 SANS 1371:2008Edition 1.2 Any reference to SABS 1371 is deemed to be a reference to this standard (Government Notice No. 1373 of 8
4、 November 2002) SOUTH AFRICAN NATIONAL STANDARD Ceramic hollow insulators for standard transformer bushings Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 1371:2008 Edition 1.2 Table o
5、f changes Change No. Date Scope Amdt 1 2002 Amended to change the definition for “acceptable“ and to update referenced standards. Amdt 2 2008 Amended to change the designation of SABS standards to SANS standards and to update referenced standards. Foreword This South African standard was approved by
6、 National Committee SABS SC 67D, Electricity distribution systems and components Insulators, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in December 2008. This document supersedes SABS 1371:2002 (editi
7、on 1.1). A vertical line in the margin shows where the text has been technically modified by amendment No. 2. SANS 1371:2008 Edition 1.2 1 Contents Page Foreword 1 Scope . 3 2 Definition 3 3 Requirements 3 4 Packing and marking . 4 5 Inspection and method of test. 4 5.1 Inspection 4 5.2 High voltage
8、 withstand test 5 Figures 1 to 6. 5-10 Appendix A Applicable standards 11 Appendix B Notes to purchasers . 11 Appendix C Quality verification of ceramic hollow insulators produced to the requirements laid down in the standard 11 SANS 1371:2008 Edition 1.2 2 This page is intentionally left blank SANS
9、 1371:2008 Edition 1.2 3 Ceramic hollow insulators for standard transformer bushings 1 Scope 1.1 This standard covers ceramic hollow insulators for use in standard transformer bushings covered by SANS 1037. NOTES a) The standards referred to in this standard are listed in appendix A. b) Requirements
10、 that must be specified by the purchaser are given in appendix B. c) Information regarding the verification of the quality of ceramic hollow insulators produced to this standard and a sampling plan that could be used to assess compliance with the standard of a lot of hollow insulators are given in a
11、ppendix C. 2 Definition acceptable acceptable to the authority administering this standard or to the parties concluding the purchase contract as relevant Amdt 1 3 Requirements 3.1 Type A hollow insulator shall be of one of the types given in figures 1 to 6.1)3.2 Shape and dimensions 3.2.1 The shape
12、of a hollow insulator shall be in accordance with the drawing or data sheet of the hollow insulator and shall, in general, conform to one of the typical designs given in figures 1 to 6, appropriate to the type designation of the insulator. 3.2.2 The dimensions of a hollow insulator shall not differ
13、from those given on the drawing or in the data sheet of the hollow insulator by more than the relevant tolerance given in SANS 62155. Amdt 1; amdt 2 3.2.3 The faces on a hollow insulator and, when relevant, on its insulator cup that are intended to form part of the oil seal on the partition on which
14、 the bushing is to be mounted shall be at right angles to the axis of the hollow insulator and, when relevant, to the axis of the insulator cup. 1) See appendix B. SANS 1371:2008 Edition 1.2 4 3.2.4 The surface of the conical portion, if any, of the bore of a hollow insulator shall be at an angle of
15、 25 - 30 to the axis of the hollow insulator. 3.3 Material A hollow insulator shall be of ceramic material. Any insulator cup associated with the hollow insulator shall be of ceramic or acceptable organic material. 3.4 Freedom from porosity A hollow insulator shall comply with the requirements for f
16、reedom from porosity given in SANS 62155. Amdt 1; amdt 2 3.5 Glaze A hollow insulator shall comply with the requirements for glaze given in SANS 62155. Amdt 1; amdt 2 3.6 High voltage withstand When tested in accordance with 5.2, a hollow insulator shall withstand, without puncture or damage, the ap
17、propriate test voltage. 3.7 Resistance to temperature cycling A hollow insulator shall comply with the requirements for resistance to temperature cycling given in SANS 62155. Amdt 1; amdt 2 4 Packing and marking 4.1 Packing Hollow insulators shall be so packed in containers that they are protected f
18、rom damage during normal handling and transportation. 4.2 Marking The following information shall appear in legible and indelible marking on each hollow insulator of types R, S and T, and on the air end of each hollow insulator of types other than types R, S and T: The manufacturers name, trade name
19、 or trade mark. 5 Inspection and method of test 5.1 Inspection Visually examine and measure each hollow insulator in the sample for compliance with all the relevant requirements of the standard, compliance which is not assessed by testing. SANS 1371:2008 Edition 1.2 5 5.2 High voltage withstand test
20、 Place the hollow insulator, which must be clean and dry, in a hole in an earthed metal plate, the diameter of the hole being as specified in SANS 1037 for the appropriate bushing assembly. If the hollow insulator is intended for use with one end or both ends immersed in an insulating medium, immers
21、e the shorter end in insulating oil that complies with the requirements of SANS 555, to a depth sufficient to prevent flashover. Insert a suitable metal stem conductor and apply to the stem for a continuous period of not less than 1 min an a.c. voltage sufficient to produce occasional flashover, the
22、n examine the hollow insulator for compliance with 3.6. Dimensions in millimetres 1 2 3 Dimension mm Type of insulator a b X A B C D 12 16 22 32 44 27 35 42 48 64 Figure 1 Typical hollow insulator of types X, A, B, C and D SANS 1371:2008 Edition 1.2 6 Dimensions in millimetres Figure 2 Typical hollo
23、w insulator of type E SANS 1371:2008 Edition 1.2 7 Dimensions in millimetres Figure 3 Typical hollow insulator of type F SANS 1371:2008 Edition 1.2 8 Dimensions in millimetres 1 2 3 Dimension mm Type of insulator a b G H 51 58 83 95 Figure 4 Typical hollow insulator of types G (2 sheds) and H (3 she
24、ds) SANS 1371:2008 Edition 1.2 9 Dimensions in millimetres Figure 5 Typical hollow insulator of type M SANS 1371:2008 Edition 1.2 10 Dimensions in millimetres 1 2 3 Dimension mm Type of insulator a b R S T 19 44 64 48 71 102 Figure 6 Typical hollow insulator of types R, S and T SANS 1371:2008 Editio
25、n 1.2 11 Appendix A2)Applicable standards Reference is made to the latest issues of the following standards: SANS 555, Unused and reclaimed mineral insulating oils for transformers and switchgear. SANS 1037, Standard transformer bushings. SANS 9001/ISO 9001, Quality management systems Requirements.
26、Amdt 1 SANS 62155/IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1 000 V. Amdt 2 Appendix B Notes to purchasers The following requirements must be specified in tender invitations and in each order or contr
27、act: a) the type of hollow insulator (see 3.1); and b) where the shape or a dimension of the type of hollow insulator differs from the shape or dimension given in the relevant figure, the modified shape or dimension (see 3.2). Appendix C Quality verification of ceramic hollow insulators produced to
28、the requirements laid down in the standard Amdt 2 C.1 Quality verification C.1.1 When a purchaser requires ongoing verification of the quality of ceramic hollow insulators, it is suggested that, instead of concentrating solely on the evaluation of the final product, the purchaser also pays attention
29、 to the quality system of the manufacturer. In this connection it should be noted that SANS 9001 covers the provision of an integrated quality system. Amdt 1; amdt 2 C.1.2 If the hollow insulators do not bear a certification mark and no information about the implementation of quality control or test
30、ing during manufacture is available to help in assessing the quality of a lot, and a purchaser wishes to establish, by inspection and testing of samples of the final product, whether a lot (as defined in C.2.1) of the hollow insulators produced to this standard complies with its requirements, the sa
31、mpling plan given in C.2 can be applied. It must be noted that a) such a sampling plan applies to fully manufactured hollow insulators only, and 2) The information in the appendices is additional to that in the standard and has been included purely for amplification and guidance. SANS 1371:2008 Edit
32、ion 1.2 12 b) a lot that, in terms of the plan, is deemed to comply with the standard could contain defective insulators to an extent proportional to that permitted by the relevant acceptance number given in the sampling plan. C.2 Assessment of compliance with the standard C.2.1 Definitions defectiv
33、e a ceramic hollow insulator that fails in one or more respects to comply with the relevant requirements of the standard. lot not less than three and not more than 1 000 ceramic hollow insulators of the same type, from one manufacturer, submitted at any one time for inspection and testing. C.2.2 Sampling C.2.2.1 Use the sampling procedure and the criteria for compliance given in SANS 62155 to determine whether a lot complies with the standard, and deem the samples so taken to represent the lot for the respective properties. Amdt 1; amdt 2 SABS
