IEC 60216-1 PDF
IEC. Fourth edition. Electrical insulating materials – +41 22 02 11 Telefax: +41 22 03 00 E-mail: [email protected] Web: 标准 IEC 电气绝缘材料 耐热性 第1部分：老化程序和试验结果的 评定_电力/水利_工程科技_专业资料。标准 IEC 电气. this publication, including its validity, is available in the IEC Catalogue of IEC Electrical insulating materials – Properties of thermal endurance.
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At the same time, the calculation procedures were made more comprehensive, enabling full statistical testing of data obtained isc a diagnostic property of any type, including the particular case of partially incomplete data. The common usage is employed throughout this standard. Plot these time-temperature pairs on the thermal endurance graph and draw a smooth curve passing through these points. A flow chart and decision table setting out the procedures and conditions are given in Annexes A and B of IEC A simplified procedure is available in IEC 602161- The intercept of this line with the end-point line gives the logarithm of the required time to end-point see Figure 4.
TC – Evaluation and qualification of electrical insulating materials and systems rss. The procedure is carried out numerically, ied appropriate statistical tests are introduced.
Failures at the end of the first ageing cycle cannot be accepted.
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In the 60126-1 way, calculate the temperature? There are two alternative ways in which the end-point may be defined: Physico-chemical models postulated for the ageing processes led to the almost universal assumption of the Arrhenius equations to describe the rate of ageing. Some test properties may require measurement at the oven temperature, in which case the ageing is continuous.
Licences can cover as few or as many users as you wish. This difference is dependent on the scatter of the data points, the deviations from linearity in the regression analysis, the number of data points and the extent of extrapolation. It may arise from inadequate experimental technique for example, oven temperature errors ; such non-linearity may be corrected by further testing. For some materials, it is not possible to achieve a time to end-point of less than h while retaining satisfactory linearity.
Such complications may arise, for example, if the thermal endurance relationship turns out to be non-linear, or if specimens are lost due to thermal runaway of an oven. Instructions for an adequate number of specimens are given in IEC Before determining the property value, these specimens shall be conditioned by exposure to the lowest level of ageing temperature of the test see 5.
This led to the concept of the “Thermal Endurance Ifc TEPincorporating the temperature index, its variation with specified ageing time, and a confidence limit.
The material specifications or the test standards will contain all necessary instructions for the preparation of specimens.
TEP was then abandoned, with the TI and HIC being reported in a way which indicated whether or not the statistical tests had been fully satisfied. For undated references, the latest edition of kec referenced document including any amendments applies. Determination of thermal endurance properties of electrical insulating materials — Choice of test criteria IEC After a few cycles, the remaining specimens can be placed in the oven and the points on the ageing curve property variation curve see Figures 2, 3 and 4which are deemed necessary, determined.
However, there is often a need for such information related to other longer or shorter times.
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For the determination of the initial value, see 5. Particular care will be needed for very short specification times, since the higher ageing temperatures may lead into temperature regions which include transition points, for example, glass transition temperature or partial melting, with consequent non-linearity.
In such cases, it may be possible to obtain an acceptable result by further testing at a lower temperature. It was felt to be much more important that assurance could be given that the difference between the calculated TI and its lower confidence limit was less than a specified value. The large statistical scatter of test data which was found, together with the frequent occurrence of substantial deviations from the ideal behavior, demonstrated the need for tests to assess the validity of the basic physico-chemical model.
Establish the exposure temperatures and times in accordance with the instructions of 5.
Either a new group, possibly with a shorter cycle time, should be started, or the first cycle failure ignored and the nominal size of the group reduced by one for example, a temperature group of 21 would be treated in the mathematical process as 20; see 6. Instructions for calculating thermal endurance characteristics using simplified procedures. In order to carry out valid calculations, 602161- or more further group s of specimens shall be aged at such a lower temperature as will enable the conditions to be met.
标准 IEC 电气绝缘材料 耐热性 第1部分：老化程序和试验结果的评定_百度文库
On the same graph, plot the ageing temperatures, the times to end-point measured or hypotheticaland the mean times. This will have the effect of decreasing the extrapolation, which is one of the influences in determining the size of the confidence interval, and also make the errors associated with the non-linearity less serious.
The format of the TI is then: This publication does not purport to include all the necessary provisions of a contract. Five of the test groups are placed in the oven at the beginning of the sequence.
Relevant and detailed instructions on how to proceed using non-destructive, proof or destructive test criteria are provided in 5. These values are intended solely as illustration and may be changed as the work requires.
In this way, any required ageing of additional specimens in case of unforeseen complications will introduce a minimum risk of producing systematic differences between groups of specimens. Test the specimens and plot the results and the arithmetic mean of the results or a suitable transform thereof against the logarithm of exposure time as given in IEC General procedures for the determination of thermal endurance properties, temperature indices and thermal endurance profiles withdrawn ISOPlastics — Standard atmospheres for conditioning and testing ISO NOTE 1 It is suggested that individual specimens be identified to simplify their return to the correct oven after each test.
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A simplified procedure, requiring a limited subset of the following tests is reported in IEC For graphical derivation and in some other cases the treatment of data may be simpler if the number of specimens in each group is odd. In this case, cycle times of 56 days, or 62016-1 more, may be required. Related publications IEC It is necessary to ensure that the intercept of the regression line with the time axis gives the same value as the mean of the intercepts of the individual lines.