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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Instructions for calculating thermal endurance characteristics IEC all Parts 4Electrical insulating materials — Thermal endurance properties — Part 4: A flow chart and decision table setting out the procedures and conditions are given in Annexes A and B of IEC It is advisable to distinguish between: Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
If you need international and foreign standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team. 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. The degree of degradation indicated as the end-point of the test should be related to the allowable safe value for the material property which is desired in practice.
The regression analysis for slope and intercept of the thermal endurance graph and the tests for deviations from linearity shall be as in 6. Consequently, a material may be assigned more than one temperature index, derived, for example, from the measurement of different properties and the use of different end-point times.
Where there is no risk of ambiguity, either temperature groups or test groups may be referred to simply as groups. Diagnostic procedures may be non-destructive or destructive determinations of a property or potentially destructive proof tests see 5. Our prices are in Swiss francs CHF. The IEC series has been developed to formalize these procedures and the interpretation of their results.
An approximately linear region of the ageing graph is selected Figure 3 and a line parallel to the mean ageing graph drawn through each time, property point. About us We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.
Out of this arose the concept of the temperature index TI as a single-point characteristic based upon accelerated ageing data.
The 602161- experimental and evaluation procedures are given in Clause 5 and as far as 6. Plot these time-temperature pairs on the thermal endurance graph and draw a smooth curve passing through these points. A simplified 62016-1 is available in IEC Continue the cycles of temperature exposure, cooling and application of the test until the average measured value for the specimens in the group has reached the end-point specified and provided at least one point beyond the end-point.
A time to end-point within the first ageing period shall be treated as invalid. In this case, either a start again with a new group of specimens, or b ignore the specimen and reduce the value ascribed to the number m i of specimens in group i by one. For further information, email bsmusales bsigroup. This standard is concerned only with type 2. Organizations of all sizes and across all sectors choose standards to help them achieve their goals. The value of 660216-1 square is between 0 no correlation and 1 complete correlation.
A simplified calculation procedure is described in IEC 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 A simplified procedure is given in 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.
The abscissa is usually graduated in a non-linear Celsius temperature scale oriented with temperature increasing from left to right. This sixth edition cancels and replaces the fifth edition, published in NOTE 2 600216-1 above definition is not strictly compatible with the figure and also differs slightly from the definition in the second edition of IEC If, for example, Group C has reached end-point nine cyclesGroups G, H and I would have received respectively six, seven and eight cycles at testing.
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Unless otherwise stated in the method for determining the diagnostic property for example, parts of material specifications dealing with methods of test, or a method listed in IECthe initial value is the arithmetic mean of the test results.
The general calculation procedures outlined here and detailed in IEC are based on the principles set out in IEC Some physical properties are sensitive even to minor variations of specimen thickness. Except as permitted under the Copyright, Designs and Patents Act no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means — electronic, photocopying, recording or otherwise — without prior written permission from BSI.
Copyright All the data, software and documentation set out in all British Standards and other BSI publications are the property of and copyrighted by BSI, or some person or entity that owns copyright in the information used such as the international standardization bodies and has formally licensed such information to BSI for commercial publication and use.
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 The temperature extrapolation again shall not exceed 25 K. In cases of longer times, for example, the times given as requirements or recommendations in the text of this standard for example, 5 h for the minimum value of the longest time to end-point shall be increased in the ratio of the actual specification time to 20 h.
It constitutes an editorial revision where the simplified method has been removed and now forms Part 8 of the IEC series: The characteristic has now been made the subject of a new, independent standard in preparation.
However, there is often a need for such information 6016-1 to other longer or shorter times. Throughout the rest of this standard the term “insulating materials” is always taken to mean “insulating materials and simple combinations of such materials”.
A number of recommendations and suggestions, useful in establishing times and temperatures, will be found in Annex B. Instructions for an adequate number of specimens are given in IEC These tests have been designed to lec all important aspects of the data which might invalidate derivation of thermal endurance characteristics, as well as to decide whether a failure to satisfy the statistical requirements is of practical significance.
For dated references, only the edition cited applies. Early results of the ageing test may motivate an adjustment of ageing cycles or additional ageing temperatures. However, in many cases, the deviations arise from the ageing behavior of the material; this happens with many thermoplastic materials or other materials where the ageing temperature range includes, or is close to, a transition temperature of some kind, or where there is more than one ageing mechanism at work.
Although originally developed for use with electrical insulating materials and simple combinations of such materials, the procedures are considered to be of more general applicability and are widely used in the assessment of materials not intended for use as electrical insulation.
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To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit bsigroup. Consequently, a material may be assigned more than one temperature index or halving interval derived, for example, from the measurement of different properties.
The first assumption is tested by the so-called Fisher test F -test. Calculation procedures and suitable restrictions have been developed 60216–1 meet these circumstances and are given in detail in IEC