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1、J IS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Testing method for insulators- Part 3 : Hollow insulators ICs 29.080.10 Descriptors : electric insulators, electrical porcelain, electrically-insulated bushings, Reference number : JIS C 3801-3 : 1999 (E) el
2、ectrical installations, testing PROTECTED BY COPYRIGHT 16 S Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license from IHS -,-,
3、- C 3801-3 : 1999 Foreword This translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Con
4、sequently JIS C 3801 : 1993 is replaced with JIS C 3801-1 to -3 : 1999. In this revision, the contents of JIS C 3801 : 1993 and JIS C 3804 : 1982 are divided into three parts according to aimed products and the Inter- national Standard corresponding to this part is stated in Annex (nor- mative) for
5、being in conformity with International Standards. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the p
6、ublic which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening
7、to the public which have the said technical properties. JIS C 3801 consists of the following parts with the general title Testing method for insulators. Part 1 : Insulators for overhead line Part 2 :Post insulators for station Part 3 : Hollow insulators Date of Establishment: 1999-03-20 Date of Publ
8、ic Notice in Official Gazette: 1999-03-23 Investigated by: Japanese Industrial Standards Committee Divisional Council on Electricity JIS C 3801-3 : 1999, First English edition published in 2003-01 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440
9、 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopy
10、ing and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or n
11、etworking permitted without license from IHS -,-,- C 3801-3 : 1999 Contents Page Introduction . 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Classification of tests 2 5 Dimensional test 2 5.1 Dimensions 2 5.2 Partial thickness 2 5.3 Camber . 3 5.4 Shed angle 4 5.5 Parallelism of the end fa
12、ces 4 5.6 Eccentricity . 5 6 Visual test . 5 7 Temperature cycle test . 5 8 Porosity test . 6 9 Power frequency withstand voltage test . 6 10 Mechanical failing load test by bending . 7 11 Mechanical failing load test by internal pressure 8 11.1 Hollow insulator cemented with metal fittings . 8 11.2
13、 Hollow insulator not cemented with metal fitting 9 12 Inspection method . 10 12.1 Sampling inspection 10 12.2 Screening . 10 Annex (normative) Tests on hollow insulators for use in electrical equipment . 15 Introduction . 15 Section one-General . 15 PROTECTED BY COPYRIGHT Copyright Japanese Standar
14、ds Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license from IHS -,-,- C 3801-3 : 1999 1 Scope 15 2 Object . 15 3 Tests . 15 4 Classification of tests 16 S
15、ection two-Routine tests . 17 5 Visual inspection . 17 6 Electrical routine test . 18 Section three-Sample tests . 18 7 Verification of dimensions . 18 8 Porosity test (for hollow insulators of ceramic material only) . 20 9 Temperature cycle test . 21 10 Re-test procedure . 23 Amendment (normative)
16、Tests on hollow insulators for use in electrical equipment 25 (ii) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted
17、 without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS C 3801-3 : 1999 Testing method for insulators- Part 3 : Hollow insulators Introduction This Japanese Industrial Standard has been prepared based on IEC 60233 Tests on hollow insulators for use in electrical equipment published in 1974
18、as the second edition and its Amendment 1 (1988) in such a manner that the testing method for insulators specified in old JIS is adopted as the text and the Interna- tional Standard corresponding to this Standard is stated in Annex without modifica- tion in technical contents. However, the testing s
19、olution for porosity test is specified by changing the contents of the International Standard to precede the safety. The amendments are included in this preparation. The IEC Standard number is based on the new numbering system of IEC Stan- dards put in force on January 1st 1997, and the Standard pub
20、lished before the said date is numbered by adding 60000 to the former number. This is only the change in the numbering system and the contents remain unchanged. 1 Scope This Standard specifies testing methods for porcelain hollow insulators to be used for electric machinery and equipment with a nomi
21、nal voltage not less than 3 300 V (hereafter referred to as “hollow insulators”). Either of the specifications stated in this text or those stated in the Annex (nor- mative) shall be applied throughout to a product, and it is not allowed to apply the items and contents from the text and Annex confus
22、edly. Remarks : The International Standard corresponding to this Standard is given below. IEC 60233 : 1974 Tests on hollow insulators for use in electrical equip- ment 2 Nomnative references The following standards contain provisions which, through reference in this Standard, constitute provisions o
23、f this Standard. The most recent editions of the standards indicated below shall be applied. JIS B 7503 Dial gauges JIS B 7507 JIS B 7512 JIS B 7516 Metal rules JIS C 3802 Permissible limits of visual defects for insulating porcelains JIS C 3803 Glossary of terms for insulator and bushing JIS K 8891
24、 Methanol Vernier, dial and digital callipers Steel tape measures 3 Definitions stated in JIS C 3803, the following principal definitions apply: For the purposes of this Standard, in addition to the definitions PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under lic
25、ense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 C 3801-3 : 1999 camber The maximum value of difference between the straight line connect- ing centres of outer profiles at
26、 both ends of a hollow insulator and the line passing through centres of the hollow insulator. partial thickness The difference between the maximum wall thickness and the minimum wall thickness in the same plane perpendicular to the axis of a hollow insulator. shed angle mum dimension from the end s
27、hed to the end face of a hollow insulator. parallelism of the end faces The difference between the maximum height and the minimum height of an end face from the end face to be attached to the equipment being adapted as the reference face. eccentricity The difference between the normal passing throug
28、h the centre of outer profile of the face to be attached to the equipment being adopted as the reference face, and the centre of outer profile of the other end face. The difference between the maximum dimension and the mini- 4 Classification of tests The tests are classified as given in Table 1. Tab
29、le 1 Classification of tests 5 Dimensional test 5 . 1 Dimensions The dimensions shall be measured, based on the drawing, using necessary measuring apparatus such as the vernier callipers specified in JIS B 7507, the metal rules specified in JIS B 7516, the steel tape measures specified in JIS B 7512
30、, the dial gauges specified in JIS B 7503. 5.2 Partial thickness The difference between the maximum wall thickness and the minimum wall thickness on the circumference of core parts of hollow shall be measured, by following the procedure illustrated in Fig. 1 to obtain the thickness. PROTECTED BY COP
31、YRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 C 3801-3 : 1999 Partial thickness: a =A, -Amin Fi
32、g. 1 Measuring method for partial thickness 5.3 Camber The camber shall be obtained, by following the procedure illustrated in Fig. 2, as the maximum deflection of the axis of hollow (locus of the centres of transverse-sections) from the straight line which is taken as the reference and passes the c
33、entres of outer profiles (diameters) at both end faces of the hollow porcelain. f Reference line Camber: b Remarks : The camber may be obtained in such a manner that the hollow insu- lator is rotated about the straight line which is taken as the axis and passes the centres of outer profiles (diamete
34、rs) at both end faces of the hollow insulator, the maximum value B, of the dimension from the reference line to the outer profile of core partB and such dimen- sion at 180 degrees opposite position where Bmax appeared Bmin are measured, and the camber is calculated as follows: - of the artificial ra
35、in used later in the test, and shall remain submerged for a period of 15 min. The insulator shall then be withdrawn and immediately exposed for a period of 15 min to a spray of artificial rain at an intensity of about 3 mm per minute. This heating and cooling cycle shall be performed three times in
36、succession. The time taken to transfer from the hot bath to the rain, and vice versa, shall be as short as possible. Requirements applicable to Tests a) and b) The volume of water contained in the baths for Tests a) and b) above shall be sufficiently great for the immer- sion of the insulator not to
37、 cause a variation of more than t 5 deg C in the tem- perature of the water. After the three cycles, the hollow insulator shall show no cracks or damage to the glaze or other faults causing a deterioration in its electrical or mechani- cal properties. The absence of such deterioration is considered
38、verified if the hollow insula- tor passes the electrical routine test, described in Clause 6. A hollow insulator which has successfully passed the temperature cycle test may be supplied with the rest of the batch for normal service. Note : The restriction not to use an intermediate container does no
39、t exclude the use of a wire mesh basket having a low thermal capacity and giving free access of water. 10 Re-test procedure a) Re-test for hollow insulators which are not in accordance with the re- quirements of Clause 7 If one or more hollow insulators examined during the sample tests fail to meet
40、the requirements of Clause 7, it may be agreed PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license fro
41、m IHS -,-,- 24 C 3801-3 : 1999 between manufacturer and purchaser that the important dimensions shall be measured on every hollow insulator in the batch (the test then becomes a rou- tine test). Any pieces which do not satisfy the requirements of Clause 7 shall then be considered as not in accordanc
42、e with this Annex. A further agreement may, however, be reached between manufacturer and purchaser that under special circumstances some or all of the pieces having only dimensional faults may be accepted. Re-test for hollow insulators which fail to satisfy any one of the tests prescribed in Clauses
43、 8 and 9 b) If a single hollow insulator fails to satisfy one of the tests prescribed in Clauses 8 and 9, the test in question shall be repeated on a sample con- taining twice the number of insulators in the first sample. If, during this new test, one or more of the results are unsatisfactory, the e
44、ntire batch is considered as not in accordance with this Annex. If two or more hollow insulators fail to satisfy any of the requirements of the tests prescribed in Clauses 8 and 9, the entire batch shall be withdrawn by the manufacturer for further examination after which the whole or part of the ba
45、tch may again be offered for acceptance. The new sample shall then be three times the number of insulators in the first sample. If, in this re-test, one or more results are not satisfactory, the whole batch shall be considered as not in accordance with this Annex. PROTECTED BY COPYRIGHT Copyright Ja
46、panese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 22:59:01 MDTNo reproduction or networking permitted without license from IHS -,-,- 25 C 3801-3 : 1999 Amendment (normative) Tests on hollow insulators fo
47、r use in electrical equipment Introduction This amendment has been prepared based on IEC 60233 Amend- ment 1 : 1988 Tests on hollow insulators for use in electrical equipment, which cor- responds to the main text, without modifying the technical contents. Annex, page 17 5 Visual inspection Replace t
48、he existing text of this clause by the following: 5.1 a) Hollow insulators of ceramic material External surface The colour of the insulator shall be approximately the colour specified on the drawing. Some variation in the shade is permitted and shall not justify rejection of the insulator. This is valid also for areas where the glaze is thinner, and therefore lighter, e.g. on edges with small radii. The areas specified as glazed on the drawing shall be covered by a smooth and shining hard glaze free from cracks and other defects prejudicial to satis- fac