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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The common usage is employed throughout this standard. A choice of properties is given in IEC 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.
If not, the assumption is a priori rejected, but, since in special cases it is possible to detect a statistically significant non-linearity which is of little practical importance, the calculations may, under specified conditions, be continued in a modified way for details, see IEC Since processing conditions may significantly affect the ageing characteristics of some materials, it shall be ensured that, for example, sampling, cutting sheet from the supply roll, cutting of anisotropic material in a given direction, molding, curing, pre-conditioning, are performed in the same manner for all specimens.
It constitutes an editorial revision where the simplified method has been removed and now forms Part 8 of the IEC series: General procedures for the determination of thermal endurance properties, temperature indices and thermal endurance profiles withdrawn ISOPlastics — Standard atmospheres for conditioning and testing ISO In such cases, or if the value of HIC is known or expected to be less than 10 K, the difference between the levels of ageing temperature may need to be reduced, but to not less than 10 K so that oven temperature tolerance effects will be acceptable.
NOTE 1 It is suggested that individual specimens be identified to simplify their return to the correct oven after each test. Related publications IEC The first assumption is tested by the so-called Fisher test F -test. If either of these conditions is not met, the value of TI cannot be reported.
A procedure which has frequently been found very useful involves the delayed introduction of test groups following the sequence in the Table B. If the results do not show this, the period may be changed so that the median result may be ief in at least seven cycles preferably about 10 provided this change in cycle time is made before the fourth cycle.
Relevant and detailed instructions on how to proceed using non-destructive, proof or destructive test criteria are provided in 5. This publication does not purport to include all the necessary provisions of a contract. Place one group for exposure in each of the ovens complying with 5.
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Revisions Our British Standards and other publications are updated by amendment or revision. Where the derivation is graphical or the statistical conditions are not satisfied the format is as follows: If the data dispersion is not high through inadequate experimental technique, the effect of the high dispersion can be overcome by the use of a larger number of data values, i. A simplified calculation procedure is described in IEC 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 lec The temperature extrapolation again shall not exceed 25 K.
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Calculation procedures and suitable restrictions have been developed to meet these circumstances and are given in detail in IEC In the official version, for Bibliography, the following notes have to be added for the standards indicated: The format of the TI is then: Organizations of all sizes and across all sectors choose standards to help them achieve their goals. Throughout the rest of this standard the term “insulating materials” is always taken to mean “insulating materials and simple combinations of such materials”.
Instead, the trend of the thermal endurance relationship may be roughly estimated after the first or second failure at the lowest ageing temperature of the original programme. Times to end-point, x – and y -values General 6.
The cycles of temperature exposure may be continued until all specimens have failed, so that a more complete statistical analysis may be made see IEC In such cases it is often convenient to start by loading the ageing oven with one-half of the prepared specimens and performing measurements after the second or third exposure cycle of the recommended series. At the end of each cycle, remove all specimens from the oven.
The thickness is also important because the rate of ageing may vary with thickness.
The value of its square is between 0 no correlation and 1 complete correlation. If not, the thickness shall be reported. Generally, the following instructions 5.
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End-points of eic tests are predominantly given in the form of fixed values of the property. If these expedients are not successful, it will be necessary to test at a temperature low enough for extrapolation not to be required. For materials in which a significant variation of properties with temperature or humidity is expected, unless otherwise specified, condition the specimens overnight in standard atmosphere B of IEC However, the planned number of groups of specimens at each temperature see 5.
However, the statistical tests were considered essential, particularly after minor modifications to make them relate better to practical circumstances: Instructions for calculating thermal endurance characteristics using simplified procedures.