IEC 60990-2016 Methods of measurement of touch current and protective conductor current《接触电流和保护导体电流的测量方法》.pdf
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1、 IEC 60990 Edition 3.0 2016-05 REDLINE VERSION Methods of measurement of touch current and protective conductor current IEC 60990:2016-05 RLV(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of
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9、hnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002. Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Centre - webstore.iec.ch/csc If you wish to give us
10、your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 60990 Edition 3.0 2016-05 REDLINE VERSION Methods of measurement of touch current and protective conductor current INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.220, 35.020 ISB
11、N 978-2-8322-3449-5 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 60990:2016 RLV IEC 2016 CONTENTS FOREWORD . 6 INTRODUCTION . 8 1 Scope 11 2 Normative references . 11 3
12、Terms and definitions. 12 4 Test site 13 4.1 Test site environment 13 4.2 Test transformer . 13 4.3 Earthed neutral conductor . 13 5 Measuring equipment . 14 5.1 Selection of measuring network . 14 5.1.1 General . 14 5.1.2 Perception and startle-reaction (a.c.) 1 6 5.1.3 Letgo-immobilization (a.c.)
13、. 16 5.1.4 Electric burn (a.c.) . 16 5.1.5 Ripple-free d.c. 16 5.2 Test electrodes . 17 5.2.1 Construction 17 5.2.2 Connection 17 5.3 Configuration 17 5.4 Power connections during test . 17 5.4.1 General . 17 5.4.2 Equipment for use only on TN or TT star power distribution systems . 22 5.4.3 Equipme
14、nt for use on IT power distribution systems including unearthed delta systems . 22 5.4.4 Equipment for use on single-phase centre-earthed power supply systems or on centre-earthed delta power supply systems . 22 5.5 Supply voltage and frequency 22 5.5.1 Supply voltage . 22 5.5.2 Supply frequency . 2
15、3 6 Test procedure 23 6.1 General . 23 6.1.1 Touch current measurements . 23 6.1.2 Control switches, equipment and supply conditions 23 6.1.3 Use of measuring networks 24 6.2 Normal and fault conditions of equipment 24 6.2.1 Normal operation of equipment 24 6.2.2 Equipment and supply fault condition
16、s 24 7 Evaluation of results 26 7.1 Perception, startle-reaction and letgo-immobilization . 26 7.2 Electric burn 26 8 Measurement of protective conductor current . 26 8.1 General . 26 8.2 Multiple equipment 26 8.3 Measuring method . 27 IEC 60990:2016 RLV IEC 2016 3 Annex A (normative) Equipment . 28
17、 Annex B (normative) Use of a conductive plane 29 Annex C (normative) Incidentally connected parts . 30 Annex D (informative) Choice of current limits 31 D.1 General . 31 D.2 Limit examples 31 D.2.1 Ventricular fibrillation . 31 D.2.2 Inability to letgo-immobilization . 31 D.2.3 Startle-reaction 31
18、D.2.4 Perception threshold 31 D.2.5 Special applications . 31 D.3 Choice of limits . 32 D.4 Electric burn effects of touch current . 33 Annex E (informative) Networks for use in measurement of touch current . 34 E.1 General . 34 E.2 Body impedance network Figure 3 34 E.3 Perception, Startle-reaction
19、 (and body impedance) network Figure 4 . 34 E.4 Letgo-immobilization (and body impedance) network Figure 5 . 35 Annex F (informative) Measuring network limitations and construction 36 Annex G (informative) Construction and application of touch current measuring instruments . 38 G.1 Considerations fo
20、r selection of components . 38 G.1.1 General . 38 G.1.2 Power rating and inductance for R S and R B38 G.1.3 Capacitor C S38 G.1.4 Resistors R1, R2 and R3 39 G.1.5 Capacitors C1, C2 and C3 39 G.2 Voltmeter 39 G.3 Accuracy . 39 G.4 Calibration and application of measuring instruments . 40 G.5 Records
21、40 G.6 Confirmation systems 41 Annex H (informative) Grippable part . Annex H (informative) Analysis of frequency filtered touch current circuit measurements 44 Annex I (informative) AC power distribution systems (see 5.4) 52 I.1 Introduction General 52 I.2 TN power systems . 53 I.3 TT power systems
22、 . 56 I.4 IT power systems 57 Annex J (informative) Routine and periodic touch current tests, and tests after repair or modification of mains operated equipment . 59 Annex K (normative) Network performance and calibration . 60 K.1 Network or instrument performance and initial calibration 60 K.2 Cali
23、bration in a confirmation system 62 K.2.1 General . 62 K.2.2 Measurement of input resistance 62 K.2.3 Measurement of instrument performance . 62 4 IEC 60990:2016 RLV IEC 2016 Annex M (informative) Bibliography . 65 Figure 1 Example of earthed neutral, direct supply 14 Figure 2 Example of earthed neu
24、tral, with transformer for isolation . 14 Figure 3 Measuring network, unweighted touch current . 15 Figure 4 Measuring network, touch current weighted for perception or startle-reaction 15 Figure 5 Measuring network, touch current weighted for letgo-immobilization 16 Figure 6 Test configuration: Sin
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