IEC TS 60216-7-1:2015

Electrical insulation materials - Thermal endurance properties - Part 7-1: Accelerated determination of relative thermal endurance using analytical test methods (RTEA) - Instructions for calculations based on activation energy

IEC TS 60216-7-1:2015(E) describes the procedure for the evaluation of the thermal endurance of electrical insulating materials, based on thermal analysis methods for the evaluation of the activation energy of the thermal degradation reaction and a conventional life test providing a life point in the thermal endurance graph. The purpose of the test procedure is to estimate the relative temperature index (RTE).

General Information

• Status: Published
• Publication Date: 29-Mar-2015
• ICS: 19.020 - Test conditions and procedures in general
• ICS: 29.020 - Electrical engineering in general
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: TC 112 - Evaluation and qualification of electrical insulating materials and systems
• Drafting Committee: WG 1 - TC 112/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jun-2015
• Completion Date: 30-Mar-2015

Standards Content (Sample)

IEC TS 60216-7-1 ®
Edition 1.0 2015-03
TECHNICAL
SPECIFICATION
Electrical insulation materials – Thermal endurance properties –
Part 7-1: Accelerated determination of relative thermal endurance using
analytical test methods (RTE ) – Instructions for calculations based on
A
activation energy
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IEC TS 60216-7-1 ®
Edition 1.0 2015-03
TECHNICAL
SPECIFICATION
Electrical insulation materials – Thermal endurance properties –

Part 7-1: Accelerated determination of relative thermal endurance using

analytical test methods (RTE ) – Instructions for calculations based on

A
activation energy
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.020; 29.020; 29.035.01 ISBN 978-2-8322-2430-4

– 2 – IEC TS 60216-7-1:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 9
4 General considerations . 9
4.1 Thermal degradation kinetics . 9
4.2 Thermal analysis . 10
4.3 Thermal endurance . 10
5 General basics . 11
5.1 Reaction rate, r . 11
5.2 Extent of reaction ξ . 12

5.3 Rate of conversion ξ . 12
5.4 Order of reaction, n . 12
5.5 Rate law . 13
6 Thermokinetic parameter estimation . 13
7 Analytical test methods . 16
7.1 General . 16
7.2 Isothermal methods . 16
7.3 Model-free methods . 16
7.4 Model-fitting methods . 17
7.5 Conventional reference point . 17
8 Calculation procedures . 17
8.1 Determination of the kinetic parameters . 17
8.2 Determination of analytical temperature endurance index, RTE , and halving
A
interval, HIC . 17
A
8.3 Determination of RTE . 17
A
8.3.1 General . 17
8.3.2 Calculation . 18
9 Test report. 19
Bibliography . 21

Figure 1 – Thermal endurance graph for the determination of the relative temperature
endurance (RTE) . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATION MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 7-1: Accelerated determination of relative thermal
endurance using analytical test methods (RTE ) –
A
Instructions for calculations based on activation energy

FOREWORD
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future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC TS 60216-7-1, which is a technical specification, has been prepared by IEC technical
committee 112: Evaluation and qualification of electrical insulation materials and systems.

– 4 – IEC TS 60216-7-1:2015 © IEC 2015
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
112/298/DTS 112/314/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60216 series, published under the general title Electrical insulating
materials – Thermal endurance properties, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

INTRODUCTION
The existing procedures of the IEC 60216 series for the evaluation of thermal endurance of an
electrical insulation material can be time consuming. These methods are therefore of limited
use during development of new materials or screening of existing products for use as a
material in an electrical insulation. There is an important demand from industry for a rapid test
method of relative thermal endurance (RTE) / temperature index (TI) and halving interval
(HIC) to reduce project times and cost. A short-term test procedure for conventional thermal
endurance characterization is proposed in IEC 60216-5 and a simplified approach to data
processing is described in IEC 60216-8. Non-conventional methodology for thermal
endurance characterization which can reduce further test times is considered in this technical
specification.
The basic procedure is based on thermal analysis methods (DSC and TGA in particular, but
not restricted to them) to evaluate the activation energy of the thermal degradation of the
materia
...