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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If the decision to extend the original test programme is taken after its completion, the duration of the complete procedure may become prohibitive. To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit bsigroup.
These may eic briefly expressed as follows see 3. Relevant and detailed instructions on how to proceed using non-destructive, proof or destructive test criteria are provided in 5. If such information is not available, preliminary screening tests may be performed to produce a forecast of the value of TI.
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
Unless otherwise specified, IEC shall apply. 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. If this is disregarded, any ifc to thermal endurance properties ceases to be meaningful since the properties of a material subjected to thermal irc may not all deteriorate at the same rate.
The value of its square is iiec 0 no correlation and 1 complete correlation. To reduce the uncertainties in calculating the appropriate thermal endurance characteristic, the overall temperature range of thermal exposure needs to be carefully selected, observing the following requirements if the required thermal endurance characteristics are for a projected duration of 20 A simplified procedure is given in IEC For undated references, the latest edition of the referenced document including any amendments applies.
It is not necessary ifc all groups to be equal in size or for equal numbers to have failed.
A simplified procedure is available in IEC It constitutes an editorial revision where the simplified method has been removed and now forms Part 8 of the IEC series: This value might be selected with respect to usual service requirements. 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.
Calculation procedures and suitable restrictions have been developed to meet these circumstances and are given in detail in IEC It is strongly recommended that the full evaluation procedure, as described below and in 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. In this case, cycle times of 56 days, or even more, may be required. Revisions Our British Standards and other publications are updated by amendment or revision.
These values are intended solely as illustration and may be changed as the work requires. Establish the exposure temperatures and times in accordance with the instructions of 5. Instructions for calculating thermal endurance characteristics using simplified procedures 1 1 ———————— To be published.
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The thermal endurance of an electrical insulating material is always given for a specific property and end-point. NOTE The ageing graph is formed by plotting the value of property or a suitable transform of its value against the logarithm of the exposure time.
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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. The row in table 1 corresponding to the estimated TI shows suggested ageing times in days at oven temperatures which appear at the head of the respective columns.
Ascending order in this standard implies that the data is ordered in this way, the first orderstatistic being the smallest. 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. The following test report forms are related: In such cases, it may be possible to obtain an acceptable result by further testing at a lower temperature.
The general calculation procedures outlined here and detailed in IEC are based on the principles set out in IEC However, for some materials very sensitive to the humidity in the ovens, more reliable results are obtained when the absolute humidity in the ageing oven room is controlled and equal to the absolute humidity corresponding to standard atmosphere B according to IEC 06216-2 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 602116-2 instructions and guidelines in the other parts of the standard.
Some test properties may require measurement at the oven temperature, in which case the ageing is continuous. However, further guidance will be found in IEC In the case of proof tests with incomplete data usually censored at the medianit may be possible to obtain a sufficient increase in data group size by continuing the exposure until further test specimens have failed the proof test. The correct usage is restricted to such a relationship between a reaction rate constant iev the thermodynamic temperature.
There are two alternative ways in which the end-point may be defined: Diagnostic procedures may be non-destructive or destructive determinations of a property or potentially destructive proof tests see 5. The end-point should be selected to indicate a degree of deterioration of the insulating material 06216-2 has reduced its ability to withstand a stress encountered in actual service in an insulation system. Ageing procedures and evaluation of test results IEC A sequential procedure may also be justified where the envisaged accuracy of the evaluation requires additional specimens to be aged, for example, in the case where the thermal endurance relationship turns out to be non-linear.