1、BRITISH STANDARD BS EN 61125:1993 IEC 1125:1992 Incorporating Amendment No. 1 Unused hydrocarbon-based insulating liquids Test methods for evaluating the oxidation stability The European Standard EN 61125:1993, with the incorporation of amendment A1:2004, has the status of a British Standard ICS 17.
2、220.99; 29.035.40 BS EN 61125:1993 This British Standard, having been prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1993 BSI 28 July 2004 The following BSI references rel
3、ate to the work on this British Standard: Committee reference CIL/10 Draft for comment 80/22508 DC ISBN 0 580 21870 8 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national c
4、ommittees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date Comments 15236 28 July 2004 Change to subclause 1.9.6BS E
5、N 61125:1993 BSI 28 July 2004 i National foreword This British Standard has been prepared under the direction of the Cables and Insulation Standards Policy Committee and is the English language version of EN 61125:1993, Unused hydrocarbon-based insulating liquids Test methods for evaluating the oxid
6、ation stability, including amendment A1:2004, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1125:1992, including amendment 1, published by the International Electrotechnical Commission (IEC). This standard describes three test methods A,
7、 B and C for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon-based insulating liquids. Method A describes a method for evaluating the oxidation stability of unused uninhibited mineral insulating oils under accelerated conditions. It supersedes IEC 74:1963, which is t
8、echnically equivalent to BS 2000-307:1983, Methods of test for petroleum and its products Part 307: Oxidation stability of mineral insulating oil. BS 2000-307:1983 is withdrawn. Method B describes a method for evaluating the oxidation stability of unused inhibited mineral insulating oils under accel
9、erated conditions. It supersedes IEC 474:1974, which has no corresponding British Standard. Method C describes a method for evaluating the oxidation stability of unused uninhibited and inhibited hydrocarbon insulating liquids under accelerated conditions. It supersedes IEC 813:1985 (HD 486 S1:1987),
10、 which has no corresponding British Standard. WARNING. This British Standard calls for the use of substances and procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to
11、health and safety at any stage. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document com
12、prises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 27 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61125 March 1993 + A1 June 2004
13、 ICS 17.220.99; 29.035.40 UDC 621.315.615:620.1 Supersedes HD 486 S1:1987 Descriptors: Electrical insulating materials, liquid electrical insulating materials, mineral oils, hydrocarbons, tests, estimation, oxidation stability English version Unused hydrocarbon-based insulating liquids Test methods
14、for evaluating the oxidation stability (includes amendment A1:2004) (IEC 61125:1992) Isolants liquides neufs base dhydrocarbures Mthodes dessai pour valuer la stabilit loxydation (inclut lamendement A1:2004) (CEI 61125:1992 + A1:2004) Neue Isolierflssigkeiten auf Minerallbasis Prfverfahren zur Beurt
15、eilung der Oxidationsbestndigkeit (enthlt nderung A1:2004) (IEC 61125:1992 + A1:2004) This European Standard was approved by CENELEC on1993-03-09; amendment A1 was approved by CENELEC on 2004-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the con
16、ditions for giving 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
17、three official versions (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 electrotech
18、nical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. CENELEC
19、European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 2004 All rights of exploitation in any form and by any means reserved worldwide for CENELE
20、C members. Ref. No. EN 61125:1993 + A1:2004 EEN 61125:1993 BSI 28 July 2004 2 Foreword The text of document 10(CO)263, as prepared by IEC technical committee No. 10, Fluids for electrotechnical applications, was submitted to the IEC-CENELEC parallel vote in November 1991. The reference document was
21、approved by CENELEC as EN 61125 on 9 March 1993. This European Standard supersedes HD 486 S1:1987. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A, Annex B and Annex ZA are normative. Foreword to amendment A1 The text of
22、document 10/577/FDIS, future amendment 1 to IEC 61125:1992, prepared by IEC TC 10, Fluids for electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 61125:1993 on 2004-06-01. The following dates were fixed: Contents Page Forewo
23、rd 2 Section 1. General 1.1 Scope 3 1.2 Normative references 3 1.3 General principle of the methods 3 1.4 Equipment 3 1.5 Reagents 5 1.6 Cleaning of test vessels 6 1.7 Catalyst 6 1.8 Insulating liquid sample conditioning 6 1.9 Determinations on the oxidized insulating liquid 6 Section 2. Method A 2.
24、1 Outline of the method 9 2.2 Test conditions 9 2.3 Procedure 9 2.4 Determinations on the oxidized oil 9 2.5 Report 10 2.6 Precision 10 Section 3. Method B 3.1 Outline of the method 11 3.2 Test conditions 11 3.3 Procedure 11 3.4 Determinations on the oxidized oil (optional) 12 3.5 Report 12 3.6 Prec
25、ision 13 Section 4. Method C 4.1 Outline of the method 15 4.2 Test conditions 15 4.3 Procedure 15 4.4 Determinations on the oxidized insulating liquid 16 4.5 Report 16 4.6 Precision 16 Annex A (normative) Determination of maximum diameter of the pores of a fritted glass filter 17 Annex B (normative)
26、 Thermometer specifications 18 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 25 Figure 1 Typical 8 hole (4 2) aluminium heating block 19 Figure 2 Aluminium alloy temperature measuring block 20 Figure 3 Position
27、 of the tube in the oil bath 20 Figure 4 Oxidation tube or absorption tube 21 Figure 4b Oxidation tube and absorption tube assembly 22 Figure 5 Soap bubble flowmeter 23 Figure 6 Determination of maximum diameter of the pores of a glass filter 24 latest date of publication of an identical national st
28、andard (dop) 1994-03-01 latest date of withdrawal of conflicting national standards (dow) 1994-03-01 latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-03-01 latest date by which the national standa
29、rds conflicting with the amendment have to be withdrawn (dow) 2007-06-01EN 61125:1993 BSI 28 July 2004 3 Section 1. General 1.1 Scope This International Standard describes three test methods using the same apparatus for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon
30、-based insulating liquids. It comprises four sections as follows: Section 1 describes the following items common to the three methods: the equipment and reagents; the cleaning of the glassware; the preparation of the catalyst and of the insulating liquid sample to be tested; the determinations on th
31、e oxidized insulating liquid. Section 2 Method A describes a method for evaluating the oxidation stability of unused uninhibited mineral insulating oils under accelerated conditions. Section 3 Method B describes a method for evaluating the oxidation stability of unused inhibited mineral insulating o
32、ils under accelerated conditions. Section 4 Method C describes a method for evaluating the oxidation stability of unused uninhibited and inhibited hydrocarbon insulating liquids under accelerated conditions. 1.2 Normative references The following standards contain provisions which, through reference
33、 in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most
34、 recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 247:(1978), Measurement of relative permittivity, dielectric dissipation factor and d.c. resistivity of insulating liquids. ISO 383:(1976), Laboratory glasswar
35、e Interchangeable conical ground joints. ISO 4793:(1980), Laboratory sintered (fritted) filters Porosity grading, classification and designation. ISO/DIS 6344-1, Coated abrasives Grain size analysis Part 1: Definitions, designation and principles. 1.3 General principle of the methods The liquid samp
36、le to be tested, through which a stream of oxygen or air is bubbled, is maintained for a given period at a given temperature, 100 C or 120 C, in the presence of solid copper. The resistance to oxidation is evaluated from the amount of total sludge and total acidity formed or from the time to develop
37、 a given amount of volatile acidity (induction period). 1.4 Equipment 1.4.1 Heating arangement A thermostatically-controlled aluminium alloy block heater or oil bath may be used to maintain the insulating liquid in the desired number of oxidation tubes at the required temperature 100 C0 , 5 C or 120
38、 C0 ,5 C (as examples see Figure 1 and Figure 3, pages 19 and 20). This temperature shall be read on a thermometer (see Annex B) inserted in an oxidation tube to within 5 mm from the bottom; this oxidation tube shall be filled with oil up to the immersion line of the thermometer and placed in the he
39、ating bath. The temperature of the upper surface of the thermal insulation top shall be maintained at 50 C5 C (Method A) or 60 C5 C (Methods B and C). Measure this temperature by the use of a thermometer in a drilled aluminium block (see Figure 2, page 20). The surfaces of this block, other than tha
40、t against the upper surface of the heating device, are protected by suitable thermal insulation of nominal 4 mm thickness. The thermal characteristics of this insulation shall be such as to permit the specified temperatures to be achieved. This block should be placed as near to the holes as practica
41、ble and within the area of the upper surface covering the heating device.EN 61125:1993 4 BSI 28 July 2004 When using an aluminium heating block, the oxidation tubes are inserted into the holes to an overall depth of 150 mm. The depth of the holes in the heating part of the block shall be at least 12
42、5 mm and short aluminium alloy collars, passing through the insulating cover and surrounding each oxidation tube, will ensure heating over the 150 mm length of the tube. In the case of oil baths, the oxidation tubes shall be immersed to a depth of 137 mm in the oil and to an overall depth of 150 mm
43、in the bath (see Figure 3, page 20). For both types of heating device, the height of the oxidation tubes above the upper surface shall be 60 mm and the diameter of the holes shall be just sufficient to allow insertion of the specified tube. In the case of slackness a 25 mm internal diameter O-ring m
44、ay be placed around the tube and pressed against the thermal insulation top or inserted into the annular space between the tube and the thermal insulated top. The heating bath should be equipped with supports to hold the absorption tubes. When in use the heater shall be shielded from direct sunlight
45、 and air draughts. NOTE When oil baths are used, for safety reasons, it may be advisable to place them in a fume hood. 1.4.2 Test vessels Test tubes of borosilicate or neutral glass provided with a 24/29 ground joint (see ISO 383), of the following dimensions: The test tube is fitted with a Drechsel
46、 head to which is attached the inlet tube which extends to within 2,5 mm 0,5 mm from the bottom and has its end ground at an angle of 60 to the horizontal axis (see Figure 4, page 21). 1.4.3 Absorption tubes (only required for methods B and C) These are identical to the test vessels and the distance
47、 between the axes of the two tubes shall be 150 mm 50 mm (see Figure 4 and Figure 4 bis, pages 21 and 22). Connections between the test and absorption tubes should be as short as possible, of glass tubing butt-jointed to the vessels by means of short flexible sleeves (silicone rubber sleeving has be
48、en found suitable for this purpose). These tubes are mounted outside the heating device. 1.4.4 Filtering crucibles Gooch-type crucibles with fused-in fritted glass disk according to ISO 4793 grade P 10 porosity (po r esi z ei nde x4 4m and k 10 4m) of, for example, 35 ml capacity. NOTE 1 Maximum dia
49、meter of the pores can be determined in accordance with the method described in Annex A. NOTE 2 Alternatively polymeric membrane filters may be used, provided they are compatible with oil and solvents. Suitable membranes consist of mixture of cellulose esters (cellulose nitrate + cellulose acetate) with the following characteristics: The filtration is improved by impregnating the membrane with a suitable wetti
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