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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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 The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our open consultation process. Figure 4 — Destructive tests — Estimation of time to end-point 6. In this case, either a start again with a new group of specimens, or b ignore the specimen and reduce 60216- value ascribed to the number m i of specimens in group i by one.
Do you need a multi-user copy? We continually improve the quality of our products and services to benefit your business. 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.
IEC () (R) | Standards Council of Canada – Conseil canadien des normes
For the determination of 06216-2 initial value, see 5. For graphical derivation and in some 60126-2 cases the treatment of data may be simpler if the number of specimens in each group is odd.
In such cases, it may be possible to obtain an acceptable result by further testing at a lower temperature. The reference level may for example, be a mean value one parameter or a line two parameters, slope and intercept. The 600216-2 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 the results do not show this, the period may be changed so that the median result may be expected in at least seven cycles preferably about 10 provided this change in cycle time is made before the fourth cycle. 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.
Licences can cover as few or as many users as you wish. In the same way, calculate the temperature? Diagnostic procedures may be non-destructive or destructive determinations of a property or potentially destructive proof tests see 5. To achieve this, select the cycle length so that the mean or median time to end-point is reached in about 10 cycles but not less than seven.
For dated references, only the edition cited applies. 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, 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 60216- or is close to, a transition temperature of some kind, or where there is more than one ageing mechanism at work.
In such cases, or if the value of HIC is known or expected 60261-2 be less than 10 K, the difference between the levels of ageing temperature may need to be reduced, but to not 602116-2 than 10 K so that oven temperature tolerance effects will be acceptable. NOTE 2 The above definition is not strictly compatible with the figure and also differs slightly from the definition in the second edition of IEC The row in table 1 corresponding to the estimated TI shows suggested ageing times in days at oven temperatures which appear at the head 06216-2 the respective columns.
It was subsequently found that the statistical confidence index included in the TEP was not widely understood or used.
However, for some materials very sensitive to the humidity in the ovens, more reliable results are obtained when the absolute humidity in the ageing 60126-2 room is controlled and equal to the absolute humidity corresponding irc standard atmosphere B according to IEC Instructions for calculating thermal endurance characteristics using simplified procedures 1 1 ———————— To be published. The common usage is employed throughout this standard. In all cases, ageing shall be continued until more than one-half of the test specimens in each group have failed to pass the proof test.
Evaluate the results, as listed in 6. Using Equations 46 to 50 of 6. After successive delays see footnote in Table B. Buying standards You can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at bsigroup. Five of the test groups are placed in the oven at the beginning of the sequence.
In this test, a test parameter F is calculated from the experimental data and compared with a tabulated value F 0.
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Where the derivation is graphical or the statistical conditions are not satisfied the format is as follows: 602116-2 such cases, the thickness uec each ageing period may need to be determined and reported if required in the relevant specification. In the application of this standard, it is assumed that a practically linear relationship exists between the logarithm of the time required to cause the predetermined property change and the reciprocal of the corresponding absolute temperature Arrhenius relationship.
Ageing procedures and evaluation of test results IEC However, ied is often a need for such information related to other longer or shorter times. IECStandard conditions for use prior to and during the testing of solid electrical insulating materials IECElectrical insulating materials — Thermal endurance properties — Part 2: TC – Evaluation and qualification of electrical insulating materials and systems rss.