GB/T 7752-2025Test method for dielectric strength and voltage withstand of insulating adhesive tape at power frequency (English PDF)

Foreword

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

This document supersedes GB/T 7752-1987 "Test Method for Power Frequency Breakdown Strength of Insulating Adhesive Tapes" and is consistent with GB/T 7752-1987.

Aside from structural adjustments and editorial changes, the main technical changes are as follows.

— The scope of the file has been changed (see Chapter 1, Chapter 1 of the 1987 edition);

— Added terms and definitions (see Chapter 3);

— The principle has been changed (see Chapter 4, Chapter 2 of the 1987 edition);

— Added specifications for thickness gauges (see 5.1);

— Increased the boost rate under continuous uniform boost mode (see 7.4.2, 6.4 in the 1987 edition);

— A step-up voltage boost method has been added (see 7.4.3);

— Added penetration detection (see 7.5);

— A withstand voltage test has been added (see 7.7);

— The method of calculating the test results has been changed (see 8.1, Chapter 7 of the 1987 edition);

— The results of the withstand voltage test have been added (see 8.2);

— The test report has been amended (see Chapter 9, Chapter 8 of the 1987 edition).

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Petroleum and Chemical Industry Federation.

This document is under the jurisdiction of the National Technical Committee on Standardization of Adhesives (SAC/TC185).

This document was drafted by: Meixin New Materials Co., Ltd., Shanghai Rubber Products Research Institute Co., Ltd., and Jiangsu Sidike New Materials Technology Co., Ltd.

Technology Co., Ltd., Kaiping Qiyu Adhesive Products Technology Co., Ltd., Huizhou Meixin Electronics Co., Ltd., Zhejiang Fulai New Materials Co., Ltd.

Limited Liability Company, Crown New Material Technology Co., Ltd., Yung-Ta (Zhongshan) Co., Ltd., Fujian Provincial Institute of Product Quality Inspection, Guangdong Dongli New Material Technology Co., Ltd., Guangdong Xinzhiyuan Technology Co., Ltd., Fujian Nanxin Cable Co., Ltd., and Zhongshan New Asia Adhesive Products Co., Ltd.

Limited Liability Company, Fujian Huiyang Cable Technology Co., Ltd., Meiya Nissan Cable Co., Ltd., Foshan Nanhai Xinyongtai Adhesive Products Co., Ltd.

The company, Fujian Tongyu Cable Co., Ltd., and Foshan Shunde Yongchuang Xiangyi Electronic Materials Co., Ltd.

The main drafters of this document are: Chen Weibin, Shen Yan, Jin Chuang, Luo Jier, Lin Xuehao, Yang Zhiyong, Yang Xiaoming, Li Jianxiong, Chen Huachang, and Li Jie.

Ke Yuehu, Cai Junyun, Wu Weiqing, Chen Yunling, Yang Yongqiang, Liao Changchang, Liao Yanping, Pan Daman, Chen Da, Zeng Lijuan.

The release history of this document and the document it replaces is as follows.

— First published in 1987 as GB/T 7752-1987;

— This is the second revision.

Insulating adhesive tape power frequency dielectric strength and Test method for withstand voltage

1 Scope

This document describes the test methods for the power frequency dielectric strength and withstand voltage of insulating adhesive tapes.

This document applies to the determination and evaluation of the power frequency dielectric strength and withstand voltage of insulating adhesive tapes.

2 Normative references

GB/T 7125

GB/T 22396

3 Terms and Definitions

The terms and definitions defined in GB/T 22396 and the following terms and definitions apply to this document.

4 Principles

Apply power frequency voltage to the insulating adhesive tape sample using different voltage boosting methods until breakdown occurs, measure the breakdown voltage, and record the breakdown voltage.

Divide by the sample thickness to obtain the power frequency dielectric strength.

The voltage is rapidly increased to the specified value and maintained at that value for a period of time. If the sample does not break down, this voltage value is taken as the insulation voltage.

Voltage resistance of the adhesive tape.

5 Instruments and Equipment