GB/T 4074.6-2024Test methods of winding wires - Part 6: Thermal properties (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 is part 6 of GB/T 4074 Winding Wire Test Methods: GB/T 4074 has been published in the following parts:

--- Part 1: General provisions;

--- Part 2: Dimensional measurement;

--- Part 3: Mechanical properties;

--- Part 4: Chemical properties;

--- Part 5: Electrical properties;

--- Part 6: Thermal properties;

--- Part 7: Test method for determining the temperature index of enameled winding wire;

--- Part 8: Test method for determination of temperature index of enameled winding wire - Rapid method;

--- Part 21: High frequency pulse voltage resistance:

This document replaces GB/T 4074.6-2008 "Winding wire test methods Part 6: Thermal properties" and is consistent with GB/T 4074.6-2008:

In addition to structural adjustments and editorial changes, the main technical changes are as follows:

--- Added an overview of thermal shock test (see 4.1);

--- Added an overview of the softening breakdown test (see 5.1);

--- Changed the test procedure in the softening breakdown test (see 5.3, see 4.2 of the:2008 edition);

--- The test method of temperature index test has been changed: The "temperature index test" for all winding wires shall be carried out in accordance with IEC 60172 (see Chapter 6, Chapter 5 of the:2008 edition);

--- Added an overview of weight loss test (see 7.1):

This document is equivalent to IEC 60851-6:2012 "Winding wire test methods Part 6: Thermal properties":

A new chapter "Terms and Definitions" has been added to this document:

The following minimal editorial changes were made to this document:

--- In order to coordinate with the existing standards, the name of the standard is changed to "Winding Wire Test Methods Part 6: Thermal Properties":

Introduction

Winding wire is one of the main raw materials for power, motor, electrical appliances, home appliances, electronics, communications, transportation, power grid, aviation and other fields:

It has a wide range and covers many fields, and has become an important mechanical industrial product:

GB/T 4074 Winding Wire Test Methods is the only test method standard for measuring winding wire products in China: It is very important for product testing and market regulation:

It plays an important role in both market and product improvement:

GB/T 4074 aims to establish the test method standards for the performance of different types of winding wire products and is intended to consist of the following 9 parts:

--- Part 1: General provisions: The purpose is to establish the terms, definitions and general test principles for winding wire test methods:

--- Part 2: Dimensional measurement: The purpose is to establish test methods for measuring the dimensions of different products of winding wire:

--- Part 3: Mechanical properties: The purpose is to establish test methods for the mechanical properties of different types of winding wire products:

--- Part 4: Chemical properties: The purpose is to establish test methods for the chemical properties of different types of winding wire products:

--- Part 5: Electrical properties: The purpose is to establish test methods for the electrical properties of different types of winding wire products:

--- Part 6: Thermal properties: The purpose is to establish test methods for the thermal properties of different types of winding wire products:

--- Part 7: Test method for determining the temperature index of enameled winding wire: The purpose is to establish a method for determining the temperature index of enameled winding wire:

Test procedures:

--- Part 8: Test method for determining the temperature index of enameled winding wire: Rapid method: The purpose is to establish the determination of the temperature index of enameled winding wire:

Rapid test procedure for the sensitivity index:

--- Part 21: High-frequency impulse voltage resistance performance: The purpose is to establish the test method for the high-frequency impulse voltage resistance performance of winding wires:

Winding wire test methods Part 6: Thermal properties

1 Scope

This document describes the following test methods for winding wires:

--- Test method 9: Thermal shock;

--- Test method 10: Softening breakdown;

--- Test method 15: Temperature index;

--- Test method 21: Weight loss;

For terms, definitions, general principles for test methods and a catalogue of test methods for winding wires, see IEC 60851-1:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document:

GB/T 4074.3-2024 Winding wire test methods Part 3: Mechanical properties (IEC 60851-3:2023, IDT) Note: There is no technical difference between the referenced content of GB/T 4074.3-2024 and the referenced content of IEC 60851-3:2009:

GB/T 4074.5-2024 Winding wire test methods Part 5: Electrical properties (IEC 60851-5:2019, IDT) Note: There is no technical difference between the referenced content of GB/T 4074.5-2024 and the referenced content of IEC 60851-5:2008:

3 Terms and definitions

There are no terms or definitions that require definition in this document:

4 Test method 9: Thermal shock (applicable to enameled wire and film wrapped wire)

4.1 Overview

Thermal shock reflects the ability of a specimen to withstand temperature after being stretched and/or rolled or bent on a round bar:

4.2 Sample preparation

4.2.1 Round wire

The test specimens shall be prepared as follows:

--- For enameled wire with a conductor nominal diameter less than or equal to 1:600 mm, according to 6:2:1:2 of GB/T 4074.3-2024 Regulation;

--- For enameled wire with a nominal conductor diameter greater than 1:600 mm, in accordance with 6:3 of GB/T 4074.3-2024;

--- For film-wrapped wire with a conductor nominal diameter less than or equal to 1:600 mm, according to 6:2:1:5 of GB/T 4074.3-2024