1、STD - BSI BS EM b0236-4-2-ENGL i-OOJj Lb2LlbbS 0899041 456 BRITISH STANDARD BS EN 60216-4-2:2001 IEC 60216-4-2:ZOOO Electrical insulating materials - Thermal endurance properties - Part 4-2: Ageing ovens - Precision ovens for use up to 300 “C The European Standard EN 6021642:2OOO has the status of a
2、 British Standard ICs 29.036.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEBMIITED BY COPYRIGE LAW STD.BS1 - 6s EM bZlb-g-2-ENGL 2001 111 1b24bb 0895050 178 BS EN 60216-4-2:2001 National foreword This British standard is the offickd Engiish language version of EN 6021W22000. It is identical with
3、IEC 60216-4!-22000. The UK participation in its preparation was entrusted by Technical Committee GEY15, Insulating mataiah, to SubcommiW GEU15/6, Methods of test, which has the responsibfity to: - aid enquirem to undeistand the - present to the responsible international/ European committee any enqui
4、ries on the inteqmtaion, or proposals for change, and keep the UK interests iIlf0lll-l - monitor related international and European developments and promulgate themintheuK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Fmm 1 January 1997, all I
5、EC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 027-1. For a period of time during the change over from one numbering system to the Othe29.035.01 English version Electrical insulating materials - Thermal endurance properties Part 4-2:
6、Ageing ovens - Precision ovens for use up to 300 OC (I EC 602 1 6-4-2:2000) Matriaux isolants lectriques - Elektroisolierstoffe - Proprits dendurance thermique Thermische Langzeite,genschaften Partie 4-2: Etuves de vieillissement - Teil 4-2: Alterungswrmeschrnke - Etuves de prcision pour des utilisa
7、tions Przisionswrmeschrnke fr pouvant atteindre 300 “C Temperaturen bis 300 “C (CE1 6021 64-2:2000) (IEC 602164-212000) This European Standard was approved by CENELEC on 2000-11-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving
8、 this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official ver
9、sions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees o
10、f Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Eledrotechnical Standardization Comit Europen de Normalisation Electrotechni
11、que Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stacsart 35, B - 1050 Brussels O 2000 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 6021 6-4-2:2000 E STD-BSI BS EN bO21b-4-2-ENGL 2001 E! 462ribbY
12、 0899052 T40 m Page 2 EN 60216-4-2:2000 Foreword The text of document 15U135/FDIS, future edition 1 of IEC 602164-2, prepared by SC 15E, Methods of test, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60216-4-2 on 2000-1 1-01. The
13、 following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflicting with the EN have to be withdrawn Annexes designated “normative“ are pari of
14、the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annexes A and B are informative. Annex ZA has been added by CENELEC. Endorsement notice (dop) 2001-08-01 (dw) 2003-1 1-01 The text of the International Standard IEC
15、60216-4-2:2000 was approved by CENELEC as a European Standard without any modification. - . STD.BS1 BS EN 602Lb-4-2-ENGL 2001 1111 4b24669 U899053 987 Page 3 EN 60216-4-2:2000 CONTENTS Page INTRODUCTION 4 Clause 1 Scope 5 2 Normative references . 5 3 Definitions . 6 4.1 General 7 4.2 Mechanical requ
16、irements 7 4.2.1 Oven . 7 4.3 Temperature control and indicator systems . 8 5.1 Temperatures . 9 5.2 Maximum temperature difference 9 5.3 5.4 5.5 Type and rate of ventilation 9 5.6 Exposure volume 9 Test methods and procedure . 9 6.1 Temperature and related parameters 9 6.1 . 1 Practical aspects 9 6
17、.1.2 Calculations . 10 6.1.3 Results 10 6.2 Rate of ventilation 1 1 7 Report 11 8 Conditions of use and instructions for in-service monitoring by the user 12 8.1 Conditions of use . 12 8.2 Procedure 12 8.3 In-service monitoring . 12 4 Constructional requirements 7 4.2.2 ISO-bx . 7 5 Performance requ
18、irements . 8 Maximum temperature fluctuation . 9 Maximum temperature deviation . 9 6 Annex A (informative) Test method to determine the rate of ventilation 14 A.l Sealed oven . 14 A.2 Ventilated oven 14 A.3 Calculation . 14 Annex B (informative) Examples for calculation of temperature deviation . 16
19、 B.l Error of measurement . 16 Annex ZA (normative) Normative references to international publications with their corresponding European publications 17 8 BSI 04-2001 STD-BSI BS EN b2Lb-4-2-ENGL 2QUL 5 lb24b9 O77OS4 813 .- m Page 4 EN 60216-4-2:2000 I NTRODUCTIO N IEC 6021 6, which deals with the de
20、termination of thermal endurance properties of electrical insulating materials is composed of several parts: Part 1 : General guidelines for ageing procedures and evaluation of test results; Part 2: Choice of test criteria; Part 3: Instructions for calculating thermal endurance characteristics - Sec
21、tion 1 : Calculations using mean values of normally distributed complete data; Part 3: Instructions for calculating thermal endurance characteristics - Section 2: Calculations for incomplete data: proof test results up to and including the median time to end-point (equal test groups); Part 4: Ageing
22、 ovens - Section 1: Single-chamber ovens; Part 4-3: Ageing ovens - Multi-chamber ovens (in preparation); Part 5: Guidelines for the application of thermal endurance characteristics. NOTE This series may be extended. For revisions and new parts, see the current catalogue of IEC publications for an up
23、-to-date list. STD-BSI BS EN b0216-4-2-ENGL 2002 W 2624661 0899055 75T Page 5 EN 60216-4-2:2000 ELECTRICAL INSULATING MATERIALS - THERMAL ENDURANCE PROPERTIES - Part 4-2: Ageing ovens - Precision ovens for use up to 300 OC 1 Scope This part of IEC 60216 covers minimum performance requirements for ve
24、ntilated and electrically heated precision ovens for thermal endurance evaluation of electrical insulating materials and other appropriate applications. It covers ovens designed to operate over all or part of the temperature range from 20 K above room temperature up to 300 OC. Two possible methods o
25、f achieving the required performance are described: a) where the required performance is achieved by precise control of temperature in a simple single chamber oven, .e. upgraded versions of ovens conforming to IEC 60216-4-1, and, otherwise, b) where the required performance is achieved by utilizing
26、a second chamber (iso-box), mounted within the chamber of a single-chamber oven, the purpose of which is to reduce the magnitude of any temperature changes to an acceptable level whilst maintaining the required levels of air change and circulation. NOTE 1 Experience has shown that employment of an s
27、o-box is an economical and practical means of meeting the requirements for a precision oven. NOTE 2 It is recommended that a precision oven rather than a standard oven is used when the expected halving interval is less than 10 K (20 kh to 10 kh) in order to increase the precision of the measured tem
28、perature index and halving interval to a reasonable level. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60216. For dated references, subsequent amendments to, or revisions of, any of these
29、 publications do not apply. However, parties to agreements based on this part of IEC 60216 are encouraged to investigate the possibility of applying the most recent edition of the normative documents indicated below. For undated references, the latest editions of the normative document referred to a
30、pplies. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 60216-1 :1990, Guide for the determination of thermal endurance properties of electrical insulating materials - Part I: General guidelines for ageing procedures and evaluation of fest results IEC 6021 6
31、-4-1 :1990, Guide for the determination of thermal endurance properties of electrical insulating materials - Part 4: Ageing ovens - Section 7: Single-chamber ovens Q BSI 04-2001 STDeBSI BS EN b02Lb-4-Z-ENGL 2001 bb24bb9 0899056 696 Page 6 EN 60216-4-2:2000 3 Definitions For the purpose of this part
32、of IEC 60216, the following definitions apply. 3.1 rate of ventilation number of air changes per hour in the exposure chamber at room temperature 3.2 exposure volume that part of the space in the oven chamber (or within the so-box, when used) where the temperature difference and temperature fluctuat
33、ion do not exceed the specified limits 3.3 tem perat u re f I uct uat ion maximum change in temperature at one point in the exposure volume over a period of 3 h 3.4 temperature difference maximum difference of temperature between any two points in the exposure volume at any one time 3.5 global avera
34、ge temperature average temperature, calculated from the results of determinations made over a period of approximately 3 h using nine sensors spaced throughout the exposure volume NOTE The global average temperature is considered to be the initial effective global exposure temperature if the sensors
35、are mounted in the same space that contains the specimens. The term “global exposure temperature“ is frequently abbreviated to “exposure temperature“. 3.6 global exposure temperature temperature selected for ageing test specimens to obtain data for the determination of the effects of temperature on
36、those specimens 3.7 standard oven oven with an electrically heated and ventilated chamber and with the ability to maintain the exposure temperature in its exposure volume within the limits given in IEC 60216-4-1 3.8 precision oven oven which meets the requirements of this standard NOTE The limits fo
37、r temperature difference and temperature fluctuation in the exposure volume given in this standard are tighter than those given in IEC 60216-4-1. 3.9 oven chamber interior volume of the single-chamber oven providing the space for exposing test specimens or accommodating an so-box 8 BSI 04-2001 3.1 O
38、 metal box with a close-fitting door, mounted in the oven chamber and used in preference as the exposure chamber iso-box 3.1 1 ventilation continuous passage of pre-heated air through the exposure chamber 3.12 temperature deviation calculated difference in the exposure temperature from the intended
39、value due to the combination of the temperature difference, temperature fluctuation and the error in the measurement of temperature 3.1 3 halving interval difference between two exposure temperatures which causes the halving of the heat ageing period required to arrive at a certain agreed level of p
40、roperty change of the material under test (see IEC 60216-1) 4 Constructional requirements 4.1 General The oven system shall be soundly constructed of suitable materials designed for continuous operation over the whole of the allowable temperature range. All electrical and other ancillary fittings sh
41、all be readily accessible for maintenance purposes. 4.2 Mechanical requirements 4.2.1 Oven The materials of construction of the oven chamber and the interior fittings shall be so chosen as to not influence the properties of the specimens. NOTE 1 Aluminium alloys and stainless steel have been found s
42、uitable in many cases. Attention should be given to ensure that the door to the oven chamber is provided with an efficient seal and that any gasket materials used do not influence the properties of the specimens. The exposure chamber shall be provided with a supply of preheated ventilating air which
43、 shall be directed in such a manner as to produce turbulence throughout the chamber. NOTE 2 Wherever possible, the supply should be continuously filtered, metered and monitored. NOTE 3 Inlet and outlet vent fittings with dampers designed to allow adjustment of the rate of ventilation have been found
44、 to be satisfactory. 4.2.2 ISO-box The construction shall be such that the requirements for temperature fluctuation and temperature difference are met throughout more than 50 % of the space inside the so-box when it is mounted in any chosen oven. The rate of ventilation shall conform with the requir
45、ements. NOTE Boxes made from aluminium alloy sheet have been found to be satisfactory. O BSI 04-2001 STD*BSI BS EN b02Lb-4-2-ENGL 2001 E Lb24bh7 0699058 467 Page 8 EN 60216-4-22000 The so-box shall have a door which shall be close-fitting without any sealing gasket. All air that enters the oven as v
46、entilating air shall pass through the so-box in such a manner as to produce turbulence. 4.3 Temperature control and indicator systems The oven chamber (or so-box, when used) shall be fitted with a minimum of two temperature sensors (numbered 1 and 2). Before installation, the sensors I and 2 shall b
47、e calibrated by reference to a suitable standard (sensor 3) to give a maximum measurement uncertainty within 10,5 K. The difference in reading of the two sensors, as a function of temperature shall be recorded. Sensor 3 shall have a maximum uncertainty of 10,l K. Temperature sensor 1 shall be connec
48、ted to a readout, mounted in a convenient manner, and used to indicate the chamber temperature on a continuous basis. NOTE 1 The readout also allows early identification of any malfunction in the system. Temperature sensor 2 shall be mounted as closely as possible to where the test specimens will be
49、 located. Its placement shall be well-defined and reproducible. It may be removed after the measurements. An independent sensor may be used to control the temperature. The placing of that sensor shall be at the manufacturers discretion. The control system shall have a drift rate of less than 1 Wyear. NOTE 2 The sensors may be of any type that meets the requirements (for example liquid-filled thermometer, resistance thermometer). NOTE 3 Since the performance of thermocouples is less precise than filled thermometers and resistance systems, their
