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.
| Author: | Majinn Malagrel |
| Country: | Finland |
| Language: | English (Spanish) |
| Genre: | Personal Growth |
| Published (Last): | 10 November 2011 |
| Pages: | 470 |
| PDF File Size: | 15.40 Mb |
| ePub File Size: | 10.27 Mb |
| ISBN: | 684-4-22420-180-2 |
| Downloads: | 45864 |
| Price: | Free* [*Free Regsitration Required] |
| Uploader: | Mijora |
It is good practice to prepare additional specimens, or at least to provide a reserve of the original material batch from which such specimens may subsequently be prepared.
This standard is concerned only with type 2. Instructions for calculating thermal endurance characteristics IEC all Parts 4Electrical insulating materials — Thermal endurance properties — Part 4: Five of the test groups are placed in the oven at the beginning of the sequence. Note 2 to entry: A simplified procedure, requiring a limited subset of the following tests is reported in IEC In cases of shorter specification times, the related times may be decreased in the same ratio if necessary.
For undated references, the latest edition of the referenced document including any amendments applies. A number of recommendations and suggestions, useful in establishing times and temperatures, will be found in Annex B. Groups are tested as indicated in the table. Return specimens which have withstood the proof test to the oven from which they came, at the same temperature as before, and expose for a further cycle.
Ageing data of materials with different thicknesses are not always comparable. This, or other specified conditions, shall then be reported.
Search results | IEC Webstore
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 Determination of thermal endurance properties of electrical insulating materials Choice of test criteria Electrical insulating materials – Thermal endurance properties Part 3: Further guidance will be found in IEC In the case of destructive tests 6. In the same way, the ageing cycle durations should be changed in approximately the same ratio.
If the decision to extend the original test programme is taken after its completion, the duration of the complete lec may become prohibitive. Throughout the rest of this standard the term “insulating materials” is always taken to mean “insulating materials and simple combinations of such materials”.
These tests have been designed to test 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. It may arise from inadequate experimental technique for example, oven temperature errors ; such non-linearity may be iiec by further testing.
Diagnostic procedures 60216–1 be non-destructive or destructive determinations of a property or potentially destructive proof tests see 5. It is strongly recommended that the full evaluation procedure, as described below and in 5.
The temperature extrapolation again shall not exceed 25 K. Revisions Our British Standards and other publications are updated by amendment or revision. Instead, the trend of the thermal endurance relationship may be roughly estimated after 602116-1 first or second failure at the lowest ageing temperature of the original programme.
Search results for “”
The IEC series has been developed to formalize these procedures and the interpretation of their results. A flow chart and decision table setting out the procedures and conditions are given in Annexes A and B of IEC Ageing ovens – Single-chamber ovens Electrical insulating materials – Thermal endurance properties Part 8: The size of the confidence interval is roughly proportional to the square root of the reciprocal of the total number of data values.
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. 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. 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.
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. Avenue Marnix 17, B – Brussels? There are two alternative ways in which the end-point may be defined: If a time different from 20 h has been used for deriving the TI, the relevant time expressed in kh shall be stated, followed by kh.
The reference level may for example, be a mean value one parameter or a line two parameters, slope and intercept. In addition to the above-mentioned basic assumption, some general assumptions regarding the chemical mechanisms of the thermal ageing need to be satisfied: It is identical to IEC NOTE 2 When extending the test program by submitting additional specimens to ageing at temperatures below the lower of the originally planned ageing temperatures, a temperature interval of 10 K and a cycle duration of 42 days for TI determination should be considered.
It is not necessary for all groups to be equal in size or for equal numbers to have failed. For some materials, it is not possible to achieve a time to end-point of less than h while retaining satisfactory linearity.