Standards Development
This document specifies the test method of stress -strain for stranded conductors, including the sample length, test temperature, sample preparation, requirements, test set -up, test loads, stress-strain curves etc., This document is applicable to stress-strain test for overhead electrical conductors specified in IEC 63559.
In the existing standard system of IEC TC7, stress -strain tests exist as Appendix in different standards, including IEC 61089:1991 and IEC 62219:2002. These two standards are currently going to be merged by TC7/MT2 in the Project IEC 63559 ED1, a document that is going to refer to stranded conductors made up with any combination of conductive and reinforcing/supporting wires specified in IEC 62641:2022 and IEC 63248:2022.
As IEC 63559 ED1 is going to describe also to the so-called “High Temperature Low Sag” (HTLS) conductors, new tests have been found to be necessary to correctly describe their thermos -mechanical behaviour. In order to simplify and accelerate the time for r edaction and comments of the standard (as for future maintenance), experts from TC7/MT2 agreed to leave within IEC 63559 ED1 only the tests finalized to assess the compliancy of conductors to general constructive prescriptions and to their specific datasheet, leaving all the other tests (intended to define a specific behaviour, not related to the correct production) in specific external standards, as the existing standards IEC 61395:1998 for creep test and IEC 62567:2013 for self-damping test, etc.
Under this general approach, a new standard is needed for the stress -strain test presently described in IEC 61089:1991 and IEC 62219:2002 but absent in the future IEC 63559 ED1.
A Task Force from TC7/MT2 already started an analysis for the updates necessary to the existing method in order to upgrade the standard to the present quality needs, harmonize it with other existing standards (when possible) and improve it with a section o n data processing of the results for an elastoplastic modelling to be used in overhead lines’ design software.
As a starting point, the attached draft is based on the original method for stress -strain test from IEC 61089:1991. NCs are requested to provide comments and proposals for the revision of the stress -strain test method or improvements (e.g. better descripti on of purpose of the test or use of data).
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