GB/T 11026.1-2016Electrical insulating materials -- Thermal endurance properties -- Part 1: Ageing procedures and evaluation of test results (English PDF)

Foreword

GB/T 11026 Electrical insulating materials - Thermal endurance properties consists of

the following parts.

-- Part 1.Ageing procedures and evaluation of test results;

-- Part 2.Choice of test criteria;

-- Part 3.Instructions for calculating thermal endurance characteristics;

-- Part 4.Ageing ovens - Single-chamber ovens;

-- Part 5.Ageing ovens - Precision ovens for use up to 300 °C;

-- Part 6.Ageing ovens - Multi-chamber ovens;

-- Part 7.Determination of relative thermal endurance index (RTE) of insulating

material;

-- Part 8.Determination of thermal endurance indices (TI and RTE) of an

insulating material using the fixed time frame method;

-- Part 9.Instructions for calculating thermal endurance characteristics using

simplified procedures.

This Part is Part 1 of GB/T 11026.

This Part was drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 11026.1-2003 Electrical insulating materials - Properties of

thermal endurance - Part 1.Ageing procedures and evaluation of test results. As

compared with GB/T 11026.1-2003, the main technical changes are as follows.

-- DELETE all references in the Normative references, and ADD six references

including GB/T 21223.1-2015, IEC 60212, IEC 60216-2, IEC 60216-3.2006,

IEC 60216-4 (all parts) and IEC 60216-8 (see Clause 2; Clause 2 of the 2003

edition);

-- ADD the term "end point" (see 3.1.20);

-- DELETE "the 'Articles' column and the 'TEP' symbol in Sub-clause 3.2" (see

1 Scope

This Part of GB/T 11026 specifies the general ageing conditions and procedures to be

used for deriving thermal endurance characteristics and gives guidance in using the

detailed instructions and guidelines in the other parts of GB/T 11026.

Note 1.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.

Note 2.In the application of this Part, 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).

Note 3.For the valid application of the Part, no transition, in particular no first-order

transition shall occur in the temperature range under study.

Note 4.Throughout the rest of GB/T 11026 the term "insulating materials" is always

taken to mean "insulating materials and simple combinations of such

materials".

2 Normative references

The following documents, in whole or in part, are normatively referenced in this

document and are indispensable for its application. For dated references, only the

edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

GB/T 21223.1-2015 Guide for the statistical analysis of ageing test data - Part

1 Methods based on mean values of normally distributed test results (IEC

60493-1.2011, IDT)

IEC 60212, Standard conditions for use prior to and during the testing of solid

electrical insulating materials

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