Standard Briefing:Stadard ID: GB/T 12113-2023
Stadard Title: Methods of measurement of touch current and protective conductor current
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Methods of measurement of touch current and protective conductor current
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Basic Data: | Standard ID | GB/T 12113-2023 (GB/T12113-2023) | | Description (Translated English) | Methods of measurement of touch current and protective conductor current | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L09 | | Classification of International Standard | 35.020 | | Word Count Estimation | 54,537 | | Date of Issue | 2023-09-07 | | Date of Implementation | 2024-04-01 | | Older Standard (superseded by this standard) | GB/T 12113-2003 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Contents, Scope, and Excerpt:GB/T 12113-2023. Measurement methods of contact current and protective conductor current
ICS 35.020
CCSL09
National Standards of People's Republic of China
Replace GB/T 12113-2003
Methods of measurement of touch current and protective conductor current
(IEC 60990.2016,IDT)
Published on 2023-09-07
2024-04-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
Preface V
Introduction VI
1 range 1
2 Normative reference documents 1
3 Terms and Definitions 2
4 Test site 2
4.1 Environment of the test site 2
4.2 Test transformer 2
4.3 Grounded neutral 2
5 Measuring equipment 3
5.1 Selection of measurement network 3
5.2 Test electrode 5
5.3 Configuration 5
5.4 Connection of power supply during test 5
5.5 Mains voltage and frequency 9
6 Test procedure 9
6.1 General 9
6.2 Normal and fault conditions of equipment10
7 Result Evaluation11
7.1 Sensing current, startle response current and escape from braking current 11
7.2 Electrical burns12
8 Measurement of protective conductor current 12
8.1 General 12
8.2 Multiple devices12
8.3 Measurement methods 12
Appendix A (Normative) Equipment 13
Appendix B (normative) Use of conductive plates 14
Appendix C (Normative) Parts accidentally connected15
Appendix D (informative) Selection of current limit 16
Appendix E (informative) Network for measuring touch current18
Appendix F (informative) Limits and structure of measurement networks 19
Appendix G (Informative) Structure and Application of Touch Current Measuring Instruments 21
Appendix H (Informative) Analysis of Frequency Filtered Touch Current Circuit Test 24
Appendix I (informative) AC power distribution system (see 5.4) 31
Appendix J (informative) Routine tests and periodic tests of contact current of grid power supply equipment, and after repair or change
Tests for contact current 37
Appendix K (Normative) Network Performance and Calibration 38
Reference 42
Figure 1 Directly powered grounded neutral 3
Figure 2 Grounded neutral line 3 with isolation transformer
Figure 3 Unweighted contact current measurement network 4
Figure 4 Measurement network for weighted contact current (sensory current or startle response current) 4
Figure 5 Measurement network for weighted contact current (free from braking current) 4
Figure 6 Test configuration 6 for single-phase equipment connected to a star TN or TT system
Figure 7 Test configuration 6 for single-phase equipment connected to a centrally earthed TN or TT system
Figure 8 Test configuration 6 of the same single-phase equipment connected to a star TN or TT system
Figure 9 Test configuration for single-phase equipment connected between phase and neutral conductors of a star IT system 7
Figure 10 Test configuration of phase-to-phase single-phase equipment connected to a star IT system 7
Figure 11 Test configuration for three-phase equipment connected to a star TN or TT system 7
Figure 12 Test configuration of three-phase equipment connected to star IT system 8
Figure 13 Test configuration for three-phase equipment connected to an ungrounded delta distribution system 8
Figure 14 Test configuration for three-phase equipment connected to a center-grounded delta distribution system 8
Figure A.1 Equipment 13
Figure B.1 Equipment test bench 14
Figure F.1 Frequency factor of electrical burn current19
Figure F.2 Frequency factor of sensory current/startle response current19
Figure F.3 Frequency factor 20 to get rid of braking current
Figure H.1 Triangular waveform contact current, startle response 24
Figure H.2 Triangular waveform contact current, getting rid of braking reaction 25
Figure H.3 1ms impulse response, startle response25
Figure H.4 1ms impulse response, getting rid of braking 26
Figure H.5 Point diagram of contact current and rise time, 20ms square wave 26
Figure H.6 PFC switching power supply contact current waveform 27
Figure H.7 50Hz square wave, 0.1ms rise time, startle response 27
Figure H.8 50Hz square wave, 0.1ms rise time, getting rid of braking 27
Figure H.9 Escape threshold 28 for IEC 60479-2AC DC combination (enhanced additional data)
Figure H.10 Display valid value window 29
Figure H.11 Display valid value window 29
Figure I.1 Example of TN-S distribution system 32
Figure I.2 Example of TN-CS power distribution system 33
Figure I.3 TN-C power distribution system example 33
Figure I.4 Single-phase three-wire, TN-C power distribution system example 34
Figure I.5 Example of TT power distribution system with three-phase line plus neutral line 34
Figure I.6 TT distribution system with three-phase lines 35
Figure I.7 TT power distribution system with three-phase line (plus neutral line) 35
Figure I.8 Example of three-phase line TT power distribution system 36
Table H.1 Comparison of triangular waveform responses 25
Table H.2 Square wave contact current response 26
Table H.3 Square wave single-phase contact current impulse response 28
Table H.4 Hybrid ACnDC waveform equation 29
Table H.5 Hybrid ACnDC waveform equation 29
Table K.1 Calculated values of input impedance and transmission impedance of the unweighted contact current measurement network (Figure 3)38
Table K.2 Calculated values of input impedance and transmission impedance for sensing current/startle response contact current measurement network (Figure 4)39
Table K.3 Calculated values of input impedance and transmission impedance without braking current measurement network (Fig. 5) 39
Table K.4 Ratio of output voltage to input voltage of the unweighted contact current measurement network (Figure 3)40
Table K.5 Ratio of output voltage to input voltage of the sensory current/startle response current measurement network (Figure 4) 41
Table K.6 Ratio of output voltage and input voltage without braking current measurement network (Fig. 5) 41
Preface
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 replaces GB/T 12113-2003 "Measurement methods of contact current and protective conductor current" and is consistent with GB/T 12113-2003
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
---Deleted the reference to the condition of use of "gripable parts" based on the understanding of the current effect (see.2003 version
3.4, Appendix H).
This document is equivalent to IEC 60990.2016 "Measurement method of contact current and protective conductor current".
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed and administered by the Ministry of Industry and Information Technology of the People's Republic of China.
This document was drafted by. China Electronics Technology Standardization Institute, Vertiv Technology Co., Ltd., Beijing Xiaomi Mobile Software Co., Ltd., Vertiv
Wo Mobile Communications Co., Ltd., Zhongshan Baolijin Electronics Co., Ltd., Ziguang Hengyue Technology Co., Ltd., Qingdao Haier Multimedia Co., Ltd.,
Shenzhen Skyworth Digital Technology Co., Ltd., Ningbo Bull Digital Technology Co., Ltd., Hisense Group Holdings Co., Ltd., China Conformity Assessment
National Accreditation Center, OPPO Guangdong Mobile Communications Co., Ltd., Shenzhen Saixi Information Technology Co., Ltd., Dongguan Aohai Technology Co., Ltd.
Company, Guangzhou Saixi Standard Testing Research Institute Co., Ltd., Xiamen Hanyin Electronic Technology Co., Ltd., and Honor Terminal Co., Ltd.
The main drafters of this document. Li Yuzhen, Chen Di, Wang Ying, He Penglin, Liu Yunzhu, Matan Xiaoxiao, Zhang Guanghui, Wang Houxue, Lin Junrong, Wang Zongqiang,
Wang Qingwang, Liu Fenglei, Yu Mouzhan, Cui Zhilong, Song Wenping, Chen Shaoyi, Liu Nianfeng, Guo Xiugen, Zhou Hui, Bai Zhongtao, Huang Junying, Wu Chunyu,
Lin Jinyi, Li Jianmin.
This document was first published in.1996, revised for the first time in.2003, and this is the second revision.
introduction
Electronic switching technology is widely used in power supply systems and equipment, thus producing high-frequency harmonic voltages and high-frequency harmonic currents. This document
The formulation is to solve the related problems arising from this.
How to measure leakage current
This section covers various aspects of what is known as "leakage current" in different types of equipment, both under normal conditions and under certain faults.
Method for measuring current under conditions related to physiological effects and installation situations.
The leakage current measurement methods described here are those described in GB/T 13870.1 and other publications, including descriptions of earlier measurement methods.
The above research was carried out.
The following conclusions were drawn from the study of leakage current effects.
---In terms of safety, the main consideration is the harmful current that may flow through the human body (this current is not necessarily equal to the current flowing through the protective conductor);
---It was discovered that the effects of electric current on the human body are more complex than was thought when early standards were being formulated, with several human effects to be considered.
For continuous waveforms, the most important human body effects on which the specified limits are based are.
● Perception;
● Startle reaction;
● Get rid of the brake;
● Electrical burns.
Each of these four body effects has a specific threshold, some of which vary significantly with frequency.
It has been identified that two types of current require separate measurement methods. contact current and protective conductor current.
Contact current only exists when a human body or manikin creates a current path.
Note also that the term "leakage current" has been used to express several different concepts, such as contact current, protective conductor current, insulation characteristics
properties, etc., so in this document, the term "leakage current" is not used.
Measurement of contact current
In the past, equipment standards used two traditional techniques for measuring touch current, either measuring the actual current in the protective conductor or using
A simple resistor-capacitor network (represented by a simple human body model) defines the contact current as the current flowing through the resistor.
This document uses a more representative human body model to provide measurement methods for the currents causing the four human body effects mentioned above.
This mannequin was chosen for use in delivering shocks in a general sense in most common situations. Taking into account the current path and contact conditions, use normal
A human body model with almost complete contact from hand to hand or from hand to toe under conditions. For small area contact (such as small area finger contact), select
Other models may be suitable, but are not included in this document.
Among the four effects, startle response and escape from immobilization are related to the peak value of contact current and vary with frequency. admiral of custom
The electric shock is treated as a sine wave, so it is most convenient to measure the effective value (rms). The peak measurement method is more suitable for non-sinusoidal waveforms (expected
to obtain the effective value of the contact current), but the same applies to sinusoidal waveforms. The network specified for measuring the startle response and breaking away from the braking current is
A network with frequency response characteristics. This weighted network specifies and serves as a benchmark for a single limit at power frequency.
However, electrical burns are related to the effective value of the contact current and have nothing to do with the frequency. For equipment that may cause electrical burns (see 7.2), separate
Two separate measurements are made, namely the peak value of the current for electric shock and the effective value of the current for electric burn.
The equipment committee determines which physiological effects are acceptable and which are not, and thus sets current limits for certain types of
The Equipment Committee, using this document as a basis, adopts a simplified procedure. A summary based on the early work of each equipment committee is provided in Appendix D.
Several limits are discussed.
Measurement of protective conductor current
In some cases, it is required to measure the protective conductor current of the equipment under normal operating conditions, including.
---Situation of selecting residual current protector;
---Situations requiring high integrity protective grounding circuit measurements;
---Prevent extreme overload of protective conductor current during electrical installation.
Measure the protective conductor current by connecting an ammeter with negligible internal resistance in series with the equipment protective earth conductor.
Methods of measurement of touch current and protective conductor current
1 Scope
This document describes measurement methods for the following currents.
---Direct current flowing through the human body or alternating current with sinusoidal or non-sinusoidal waveform, and
---The current flowing through the protective conductor.
The recommended method of measuring contact current is based on the possible effects caused by current flowing through the human body. In this paper, convection flows through
The measurement of the current in the measuring network (representing the human body impedance) refers to the measurement of the contact current. These networks don't necessarily work for animals.
The specification and meaning of specific limits are outside the scope of this document. IEC 60479 (all parts) provides useful information on the effects of electric current passing through the human body.
information, based on which the current limit can be determined.
This document applies to various types of equipment defined by IEC 61140.
The measurement methods in this document are not considered for use in the following situations.
---Contact current lasting less than 1s;
---Patient current specified in IEC 60601-1;
---Alternating current with frequency lower than 15Hz;
---Current exceeding the selected electrical burn limit.
This basic safety standard is mainly provided to technical committees when formulating standards according to IEC Guide104 and ISO /IEC Guide51
use. This document may not be used by manufacturers or certification bodies independently of product standards.
Technical committees use basic safety standards when developing standards. The requirements for test methods and test conditions in this document are only applicable to relevant standards.
It applies when specifically cited or specified in the standards.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
sioninstandards
Note. GB/T 20002.4-2015 Drafting of specific content in the standard Part 4.Content related to safety in the standard (ISO /IEC Guide51.
2014,MOD)
IEC 60601-1 Medical electrical equipment Part 1.General requirements for basic safety and basic performance (Medicalelectrical
Note. GB 9706.1-2020 Medical electrical equipment Part 1.General requirements for basic safety and basic performance (IEC 60601-1.2012, MOD)
Note. GB/T 17045-2020 General parts of electric shock protection devices and equipment (IEC 61140.2016, IDT)
Note. GB/T 13870 (all parts) Effects of electric current on humans and livestock [IEC 60479 (all parts)]
IEC Guide104 Preparation and use of safety publications Basic safety publications and group safety publications (Thepreparation of
......
GB/T 12113-2003
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.220
K 04
GB/T 12113-2003 / IEC 60990:1999
Replacing GB/T 12113-1996
Methods of measurement of touch current and
protective conductor current
(IEC 60990:1999, IDT)
ISSUED ON: NOVEMBER 24, 2003
IMPLEMENTED ON: AUGUST 01, 2004
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC
Table of Contents
Foreword ... 4
IEC Foreword ... 6
Introduction ... 8
1 Scope ... 11
2 Normative references ... 12
3 Definitions ... 13
4 Test site ... 13
4.1 Test site environment ... 13
4.2 Test transformer ... 14
4.3 Earthed neutral conductor ... 14
5 Measuring equipment ... 15
5.1 Selection of measuring network ... 15
5.1.1 Perception and reaction (a.c.) ... 17
5.1.2 Let-go (a.c.) ... 17
5.1.3 Electric burn (a.c.) ... 17
5.1.4 Ripple-free d.c... 17
5.2 Test electrodes ... 18
5.2.1 Construction ... 18
5.2.2 Connection ... 18
5.3 Configuration ... 18
5.4 Power connections during test ... 18
5.4.1 General ... 18
5.4.2 Equipment for use only on TN or TT star power distribution systems ... 23
5.4.3 Equipment for use on IT power distribution systems including unearthed
delta systems ... 23
5.4.4 Equipment for use on single-phase centre-earthed power supply systems
or on centre-earthed delta power supply systems ... 23
5.5 Supply voltage and frequency ... 24
5.5.1 Supply voltage ... 24
5.5.2 Supply frequency ... 24
6 Test procedure ... 24
6.1 General ... 24
6.1.1 Control switches, equipment and supply conditions ... 25
6.1.2 Use of measuring networks ... 25
6.2 Normal and fault conditions of equipment ... 26
6.2.1 Normal operation of equipment ... 26
6.2.2 Equipment and supply fault conditions ... 26
7 Evaluation of results ... 28
7.1 Perception, reaction and let-go ... 28
7.2 Electric burn ... 28
8 Measurement of protective conductor current ... 29
8.1 General ... 29
8.2 Multiple equipment ... 29
8.3 Measuring method ... 29
Annex A (Normative) Equipment ... 30
Annex B (Normative) Use of a conductive plane ... 31
Annex C (Normative) Incidentally connected parts ... 32
Annex D (Informative) Choice of current limits ... 33
Annex E (Informative) Networks for use in measurement of touch current ... 37
Annex F (Informative) Measuring network limitations and construction ... 39
Annex G (Informative) Construction and application of touch current measuring
instruments ... 41
Annex H (Informative) Grippable part ... 46
Annex J (Informative) AC power distribution systems ... 49
Annex K (Informative) Routine and periodic touch current tests, and tests after
repair or modification of mains operated equipment ... 56
Annex L (Normative) Performance and calibration ... 57
Annex M (Informative) Bibliography ... 62
Foreword
This Standard is identical to the second edition (English edition) of IEC
60990:1999 "Methods of measurement of touch current and protective
conductor current".
This Standard is a revision of GB/T 12113-1996 "Methods of measurement of
touch-current and protective conductor current" (identical to IEC 60990:1990).
The revised "Methods of measurement of touch current and protective
conductor current" has further explained the measurement of touch current and
the calibration of measuring instruments and networks. For example, in order
to accommodate some test situations, provision of an earthing alternative for
testing; provision of a more detailed description of the design and calibration of
the measurement network. This allows deletion of component tolerances from
the network diagrams; provides the measurement network, instrument
performance and initial calibration, and calibration methods and criteria in the
confirmation system.
This Standard is a recommended standard developed in order to coordinate the
various equipment committees in formulating or revising the "leakage current"
measurement method, which includes the reason and purpose for the
development of this Standard and the basis for different measurement methods.
Therefore, using IEC 60990 identically has certain guiding significance for
implementing the safety standards of various equipment and formulating
corresponding leakage current measurement methods. In order to promote
international trade and communication, participate in international product
safety certification, and coordinate with international standards, this Standard
is identical to IEC 60990:1999.
This Standard, from the date of implementation, shall replace and repeal GB/T
12113-1996.
Annexes A, B, C, and L of this Standard are normative annexes.
Annexes D, E, F, G, H, J, K, and M of this Standard are informative annexes.
This Standard was proposed by Ministry of Industry and Information Technology
of the PRC.
This Standard shall be under the jurisdiction of China Electronics
Standardization Institute (CESI).
Drafting organization of this Standard: China Electronics Standardization
Institute (CESI).
Methods of measurement of touch current and
protective conductor current
1 Scope
This Standard defines measurement methods for
- d.c. or a.c. of sinusoidal or non-sinusoidal waveform, which could flow
through the human body, and
- current flowing through a protective conductor.
The measuring methods recommended for TOUCH CURRENT are based upon
the possible effects of current flowing through a human body. In this Standard,
measurements of current through networks representing the impedance of the
human body are referred to as measurements of TOUCH CURRENT. These
networks are not necessarily valid for the bodies of animals.
The specification or implication of specific limit values is not within the scope of
this Standard. IEC 60479-1 provides information regarding the effects of current
passing through the human body from which limit values may be derived.
This Standard is applicable to all classes of EQUIPMENT, according to IEC
60536.
The methods of measurement in this Standard are not intended to be used for
- TOUCH CURRENTS having less than 1 s duration,
- patient currents as defined in GB 9706.1,
- a.c. at frequencies below 15 Hz,
- a.c. in combination with d.c. The use of a single network for a composite
indication of the effects of combined a.c. and d.c. has not been investigated,
- currents above those chosen for ELECTRIC BURN limits.
This basic safety publication is primarily intended for use by technical
committees in the preparation of standards in accordance with the principles
laid down in IEC Guide 104 and ISO/IEC Guide 51. It is not intended for use by
manufacturers or certification bodies.
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