IEC 60216-2 PDF
IEC · IEC · IEC · IEC · IEC · IEC ; Show all». IEC Standard | Guide for the determination of thermal endurance properties of ekectrical insulating materials – Part 2: List of. IEC , Electrical insulating materials – Thermal endurance properties – Part 2: Determination of thermal endurance properties of electrical.
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An approximately linear region of the ageing graph 602162 selected Figure 3 and a line parallel to the mean ageing graph drawn through each time, property point. Where the derivation is by the simplified procedure see IEC the format is: Ageing procedures and evaluation of test results 1 Scope This part of IEC specifies the general ageing conditions and procedures to be used for deriving thermal endurance characteristics and gives guidance in using the ieec instructions and guidelines in the other parts of the standard.
The common usage is employed throughout this standard.
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Using Equations 46 to 50 60216- 6. To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit bsigroup. 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.
The reference level may for example, be a mean value one parameter or a line two parameters, slope and intercept. It is permitted for these conditions not 60216–2 be satisfied in specified circumstances either a small extrapolation or linearity test at significance level 0, may be permitted; see 6.
Consequently, a material may be assigned more than one thermal endurance characteristic derived from the measurement of properties at different thicknesses.
It is identical to IEC Some test properties may require measurement at the oven temperature, in which case the ageing is continuous. The IEC series has been developed to formalize these 660216-2 and the interpretation of their ieec. The application of conventional statistical tests, as set out in IECfulfilled this requirement, resulting in the “confidence limit”, TC of TI, but the simple, single-point TI was found inadequate to describe the capabilities of materials.
If necessary, determine the initial value of the property as specified in 5. In the case of destructive tests 6. The intercept of this line with the end-point line gives the logarithm of the required time to end-point see Figure 4. You ied keep in touch with standards developments and receive substantial discounts on the purchase price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member. For dated references, only the edition cited applies.
At the same time, the calculation procedures were made more comprehensive, enabling full statistical testing of data obtained using a isc property of any type, including 6021-62 particular case of partially incomplete data. Ageing at lower temperature s of one or two additional group s of specimens in case of suspected non-linearity can then be initiated immediately to produce the complete test data within a time limit which is still acceptable.
However, environmental conditioning, the influence of atmospheres other than air and immersion in liquids such as oil may be important, but these are not the concern of this standard. If either of these conditions is not met, the value of TI cannot be reported. 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.
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. Five of the test groups are placed in the oven at the beginning of the sequence.
NOTE 1 It is suggested that individual specimens be identified to simplify their return to the correct oven after each test.
IEC () (R) | Standards Council of Canada – Conseil canadien des normes
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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. 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 6026-2 of data values, i.
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Failures at the end of the first ageing cycle cannot be accepted. If end-point is reached in one of the Groups B — F, Groups G — I are immediately removed from the oven and tested after conditioning. Users are responsible for its correct application.
Instructions for calculating thermal endurance characteristics using simplified procedures 1 1 ———————— To be published. A simplified procedure is given in IEC The validity of the model is, therefore, not dependent on the more stringent condition of a linear relationship between the level of the diagnostic property and the degree of molecular change.
Instructions for an adequate number of specimens are given in IEC 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. End-points of proof tests are predominantly given in the form of fixed values of the property. This sixth edition cancels and replaces the fifth edition, published in The characteristic has now been made the subject of a new, independent standard in preparation.
Instructions for calculating thermal endurance characteristics using simplified procedures.