GB/T 22077-2023Test method for creep of overhead conductors (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 22077-2008 "Creep test method for overhead conductors". Compared with GB/T 22077-2008, except for structural adjustment In addition to rectification and editorial changes, the main technical changes are as follows:

--- Deleted the normative references (see Chapter 2, Chapter 2 of the 2008 edition);

--- Changed the definition of loading time (see 3.5, 3.5 of the 2008 edition);

--- Deleted the terms and definitions of creep testing machine and end (see 3.7 and 3.8 of the 2008 edition);

--- Increased the terms and definitions of creep, normal temperature creep test and high temperature creep test (see 3.7, 3.8 and 3.9);

--- Changed the requirements for test equipment (see Chapter 4, Chapter 4 of the 2008 edition);

--- Changed the method of sample selection and preparation (see 5.1 and 5.2, 5.1 and 5.2 of the 2008 edition);

--- Added the test temperature and heating method of the high temperature creep test (see 6.1);

--- Added the temperature change of the high temperature creep test (see 6.2);

--- Deleted the temperature compensation (see 6.3 of the 2008 edition);

--- Changed the test load requirements (see 7.1, 7.1 of the 2008 edition);

--- Increased high temperature creep test steps [see Chapter 8 c)];

--- Changed the data record (see Chapter 9, Chapter 9 of the 2008 edition);

--- Increased test report (see Chapter 11).

This document is modified to adopt IEC 61395:1998 "Creep Test Procedure for Stranded Aerial Conductors".

Compared with IEC 61395:1998, this document has made the following structural adjustments.

---6.1 corresponds to the suspension section in Chapter 6 of IEC 61395:1998, and 6.2 corresponds to 6.1 of IEC 61395:1998;

--- Added Chapter 11 "Test Report".

The technical differences between this document and IEC 61395:1998 and their reasons are as follows:

--- Deleted the normative reference documents, this document is not limited to the overhead conductors specified in GB/T 1179, but also applies to standards in this field Stranded wire products involved in other product standards in the system;

---Changed the definition of the term "loading time", deleted the terms "creep tester" and "end", added the term "creep" and "normal temperature "creep test" and "high temperature creep test" to reflect the actual test operation and understanding of this revised content;

--- Changed the accuracy requirements for the load loading device and displacement measuring device of the test equipment to ensure the reliability of the test results;

--- Added the sample preparation method for crimping of fittings to reflect the actual test operation, making this document applicable to more overhead conductors product;

--- Added the requirements for high temperature creep test to meet the requirements of this type of test for standardized documents, which is also the main content of the revision of this document content one;

--- Added requirements for test reports, providing unified requirements for third-party testing agencies to issue test reports. The following editorial changes have been made to this document.

--- In order to coordinate with existing standards, change the name of the standard to "Creep Test Method for Overhead Conductors".

1 Scope

This document describes the test equipment, specimens, temperature and temperature changes, load and displacement measurements, test procedures, data recording, data processing and test reporting for creep tests on overhead conductors.

This document applies to the uninterrupted creep test of earth conductors for overhead transmission lines.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.