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General requirements for residual current operated protective devices (RCD)

General requirements for residual current operated protective devices

GB / T 6829-2017

Issuing Department: The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China The China National Standardization Administration Release Date: November 01, 2017 Implementation Date: May 01, 2018

Foreword

This standard was drafted in accordance with the rules given in GB / T 1.1-2009.
This standard replaces GB / Z 6829-2008 "General requirements for residual current operated protective appliances". Compared with GB / Z 6829-2008, the main technical changes are as follows:
——Add the paragraph “Any standard that can only complete one or two of the three functions mentioned above, or can not fully meet all the parts of this standard, the standard of accessories, devices or equipment can not be called RCD standard, ...” Chapter 1);
——Added the type of F-type residual current protector (see 4.7);
——Added the characterization of F-type RCD (see 5.2.9.3.3);
——Modified the description of the characteristics of the B-type RCD (see 5.2.9.4, 5.2.9.3 of the 2008 edition);
——Added F-type RCD mark and modified B-type RCD mark (see Chapter 6);
The "AC or pulsating DC residual current superimposed smooth DC" has been modified one by one to give the requirements for F-type RCD and B-type RCD (see 8.3.1.8.3, 8.3.1.4, 2008 version 8 .3.1.3,8.3.1.4);
——Modified the requirements for composite frequency residual current and increased the component values of different frequencies in the test current in Table 11 and the initial value (I ) to verify correct operation when the residual current is stably increased; 8.3.1.5, 8.3.1.5 of the 2008 edition);
——The number of poles corresponding to the smooth DC in Table 14 is increased by 2 (see Table 14);
Modified the possible load currents and fault currents in Appendix B (using 13 waveforms in the latest draft of IEC 60755) (see Appendix B, Appendix B of the 2008 edition);
--- Removed Appendix C "Supplementary Requirements for Automatic Recloser Residual Current Protection Appliances".
This standard adopts the redrafting method to modify and adopt IEC / TR 60755: 2008 "General requirements for residual current operated protective appliances".
There are technical differences between this standard and IEC / TR 60755: 2008. The terms involved in these differences have been marked by vertical single lines (|) on the outer margins. The technical differences and their causes are as follows:
—— Regarding the normative reference documents, this standard has made adjustments with technical differences to suit China's technical conditions. The adjustments are reflected in Chapter 2 “Regulatory Reference Documents”. The specific adjustments are as follows:
● Replaced IEC 60038 with GB / T 156-2007 which adopted the international standard (see 5.3);
● Replaced IEC 60364-4-41 with GB / T 16895.21-2011 equivalent to the international standard (see 5.3);
● Replaced IEC 60364-5-53 with GB / T 16895.4-1997 equivalent to the international standard (see Chapter 1);
● Replaces IEC 60998-1 with GB / T 13140.1-2008 equivalent to the international standard (see Chapter 3, 8.5);
● Replaced IEC 61140 with GB / T 17045-2008 equivalent to the international standard (see Chapter 1).
——IEC / TR 60755: 2008 stipulates that it can be used as a guide for residual current protection appliances with a rated voltage not exceeding 1000V AC. This standard can be used to guide residual current protection appliances with a rated voltage not exceeding 1200V AC;
——Add the paragraph “Any standard that can only complete one or two of the three functions mentioned above, or can not fully meet all the parts of this standard, the standard of accessories, devices or equipment can not be called RCD standards, ...” (see section Chapter 1);
—— Added classification according to action mode, IEC / TR 60755: 2008 stipulates according to relevant product standards (see 4.1.1);
-Increase the type of F-type residual current protector (see 4.7);
-Further refine the classification with time delay [see 4.9b)];
One by one classification based on the presence or absence of automatic reclosing (see 4.11);
——Added the characterization of F-type RCD (see 5.2.9.3.3);
—— 220V and 380V grades are added to the rated voltage priority value, and 800A grades are added to the rated current priority value (see 5.4.1 and 5.4.2);
——In 5.4.21.2, it is clearly stipulated that the time-delay type is only applicable to residual current protection appliances with I △ n > 0.03A, so corresponding modifications have been made in other relevant parts;
——Increased the classification, requirements and markings of type F RCDs and modified the requirements and markings of type B RCDs (see Chapter 6);
——Modified the “AC or pulsating DC residual current superimposed smooth DC” to give the requirements for F-type RCD and B-type RCD (see 8.3.1.8.3, 8.3.1.1.4);
The requirements of the composite frequency residual current have been modified one by one, and the component values of different frequencies in the test current in Table 11 have been increased, and the initial value (I ) to verify correct operation when the residual current is stably increased, and the operating current range of the composite residual current in Table 12 (see 8.3.1.5);
——This standard adds additional requirements for RCDs whose operating functions are related to power supply voltage, and stipulates that for household and similar use residual current protection appliances with I △ n ≤ 0.03A, the power supply voltage is reduced to 50V (relative to ground voltage) When the residual current is greater than or equal to the rated residual operating current, it should be able to act automatically (see 8.3.3);
——Modified the possible load current and fault current of Appendix B (see Appendix B).
This standard was proposed by the China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the National Low-Voltage Electrical Standardization Technical Committee (SAC / TC 189).
This standard was drafted: Shanghai Electric Research Institute, Zhejiang Zhengtai Electric Co., Ltd., Schneider Electric (China) Co., Ltd. Shanghai Branch, Shanghai Liangxin Electric Co., Ltd., Siemens (China) Co., Ltd., Zhongshan Kaipu Electric Co., Ltd. , Huanyu Group Zhejiang Hi-Tech Co., Ltd., Guizhou Taiyong Long March Technology Co., Ltd., Fat Thai Electric (Jiangsu) Co., Ltd., Zhejiang Pepsi Power Co., Ltd., Sanxin International Electric Shanghai Co., Ltd., Shenzhen Lianghui Technology Co., Ltd., Shanghai Nuojia Electric Co., Ltd., Shanghai Electric Co., Ltd. People's Electric Factory, Beijing ABB Low Voltage Electric Co., Ltd., Xiamen Hongfa Switchgear Co., Ltd., Eaton Electric Co., Ltd.
The main drafters of this standard: Zhou Jigang, Liu Jinzhang, Li Renjie, Si Yingge, Zhou Lei, Fan Jianguo, Xiong Houyu, Zou Jianhua, Liu Guoxing, He Guibing, Song Cheng'ai, Shi Hongwei, Su Hanlin, Zhang Jianmin, Xu Yongfu, Zhang Guorong, Wang Nong , Li Xin, Wang Xingyang.
The previous versions of the standards replaced by this standard are:
——GB 6829-1986, GB 6829-1995, GB / Z 6829-2008.

Introduction

Residual current operated protective appliances are mainly used to provide protection against dangerous and potentially fatal electric shocks, as well as to provide protection against fire hazards caused by continuous ground fault currents.
This standard specifies the operating characteristics of such appliances. In each part of GB 16895 series standard "Low Voltage Electrical Device", it is specified in detail how to install residual current operated protective appliances in order to achieve the required level of protection.
This standard is mainly used by technical committees and relevant organizations when drafting standards for residual current operated protective appliances. This standard is not used as a stand-alone standard, for example as a certification standard alone.
This standard is drafted in accordance with the guiding function of residual current action protective appliances.
There are two basic conditions for protection against electric shock: fault protection (indirect contact) and basic protection (direct contact).
Fault protection refers to the use of the appliance to prevent persistent dangerous voltages on accessible metal parts of electrical devices. These metal parts are grounded but will become live in the event of a ground fault.
In this case, the danger does not come from the user's direct contact with the live conductive part, but from the contact with the grounded metal part, and the grounded metal part itself comes into contact with the live conductive part.
The main function or basic function of residual current action protection appliances is to provide fault protection, but appliances with sufficient sensitivity (for example: residual current action protection appliances with residual action current not exceeding 30mA) have an added benefit: even if other protective measures fail The appliance can provide protection to users in direct contact with live conductive parts.
Therefore, the action characteristics given in this standard are based on the requirements, which are themselves based on the data contained in the national standard GB / T 13870 "Effects of electricity on people and livestock".
These appliances can also provide protection against fire hazards caused by long-term continuous ground fault currents that do not act as overcurrent protection appliances.