08-30180629-DC.pdf
a Date: 19 December 2008 Origin: European Latest date for receipt of comments: 20 February 2009 Project no.: 2008/01168 Responsible committee: PEL/85 Measuring equipment for electrical and electromagnetic quantities Interested committees: Title: Draft BS EN 61557-13 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1 500 v d.c. equipment for testing, measuring or monitoring of protective measures Part 13: Hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 20 February 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email cservicesbsigroup.com. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: cscbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30180629 DC Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK took an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. Comment is particularly welcome on national legislative or similar deviations that may be necessary. 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Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 85/342/CD COMMITTEE DRAFT (CD) IEC/TC or SC: TC85 Project number TC85/IEC61557-13 Ed.1.0 Title of TC/SC: MEASURING EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES Date of circulation 2008-12-12 Closing date for comments 2009-03-13 Also of interest to the following committees Supersedes document 85/323/NP, 85/332/RVN Functions concerned: Safety EMC Environment Quality assurance Secretary: Mr. Bo CHEN, China THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT SHOULD NOT BE USED FOR REFERENCE PURPOSES. RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. Title: IEC 61557-13 Ed.1: Electrical safety in low voltage distribution systems up to 1 000 v a.c. and 1 500 v d.c. equipment for testing, measuring or monitoring of protective measures Part 13: Hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems (Titre) : Introductory note Copyright © 2008 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy or “mirror“ the file or printed version of the document, or any part of it, for any other purpose without permission in writing from IEC. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 61557-13 CD © IEC:2008 2 85/342/CD 1 CONTENTS 2 3 Introduction 4 1. Scope 5 2. Normative references 6 3. Terms and definitions 7 4. Requirements 8 5. Marking and operating instructions 9 6. Tests 10 11 Table 1 - Calculation of percentage operating uncertainty 12 Figure 1 - Percentage operating uncertainty in relation to operating class and external magnetic field for 13 measuring ranges equal to and below 10 mA 14 Figure 2 - Percentage operating uncertainty in relation to operating class and external magnetic field for 15 measuring ranges equal to and above 10 mA 16 Figure 3 - Reference position for two straight conductors (for differential method) 17 Figure 4 - Example of operating positions for differential method 18 19 Annex A (informative) Examples of application 20 21 Figure A.1 - Measurement of protective conductor current direct method 22 Figure A.2 - Measurement of leakage current differential method 23 24 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 61557-13 CD © IEC:2008 3 85/342/CD 25 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1 000 V 26 a.c. AND 1 500 V d.c. EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF 27 PROTECTIVE MEASURES 28 Part 13: Hand-held and hand-manipulated current clamps and sensors for 29 measurement of leakage currents in electrical distribution systems 30 31 32 33 INTRODUCTION 34 During periodical inspections of electrical installations, it is increasingly difficult to carry out 35 measurements of insulation resistances with devices according to IEC 61557-2 when the installations 36 cannot be switched off for long periods and when there are sensitive appliances connected. Therefore, 37 the measurement of leakage currents will provide additional information about the safe or unsafe situation 38 of an installation. 39 Furthermore, the user has the opportunity to place current clamps and sensors on different points of the 40 distribution system for troubleshooting nuisance tripping of RCDs, alarms of RCMs and other problems 41 caused by low frequency leakage currents. 42 Unfortunately, the presence of high external magnetic fields has a big impact on the performance of 43 commonly used current clamps and sensors. High uncertainty and non- repeatability of readings can lead 44 to unsafe interpretations. 45 This standard defines performance classes for current clamps and sensors in relationship to ranges of 46 high external magnetic fields and gives guidance to the user to choose the appropriate measuring device 47 for a given situation. 48 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 61557-13 CD © IEC:2008 4 85/342/CD 49 1. Scope 50 This standard defines special performance requirements for hand-held and hand-manipulated current 51 clamps and sensors for measurement of leakage currents in electrical distribution systems up to 1 000 V 52 a.c. and 1 500 V d.c. taking into account the influence of high external low-frequency magnetic fields and 53 other influencing quantities. This standard does not apply to current clamps or sensors which are used in 54 combination with devices for insulation fault location according to IEC 61557-9, unless it is specified by the 55 manufacturer. 56 2.Normative references 57 The following referenced documents are indispensable for the application of this document. For dated 58 references, only the edition cited applies. For undated references, the latest edition of the referenced 59 document (including any amendments) applies. 60 IEC 60359: Electrical and electronic measurement equipment - Expression of the performance 61 62 IEC 61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use - 63 Part 1: General requirements 64 65 IEC 61010-2-032: Safety requirements for electrical equipment for measurement, control and laboratory 66 use - Part 2-032: Particular requirements for hand-held and hand-manipulated current sensors for 67 electrical test and measurement 68 69 IEC 61557-1: Electrical safety in low voltage distribution systems up to 1000Va.c. and 1500Vd.c. - Part 1: 70 General requirement 71 72 IEC 61326-1: Electrical equipment for measurement, control and laboratory use - EMC requirements - 73 Part 1: General requirements 74 75 IEC 61326-2-2: Electrical equipment for measurement, control and laboratory use - EMC requirements - 76 Part 2-2: Particular requirements - Test configurations, operational conditions and performance criteria for 77 portable test, measuring and monitoring equipment used in low-voltage distribution systems 78 79 IEC 61000-4-8: Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques - 80 Power frequency magnetic field immunity test 81 3. Terms and definitions 82 For the purposes of this document, the definitions given in IEC 61557-1 and the following apply. 83 3.1 84 hand-held and hand-manipulated current clamps and sensors 85 portable or hand-held device for measurement, display or induction of currents or for indication of types of 86 currents in non-hazardous and hazardous circuits without interruption of this circuits including defined 87 attached equipment; in the following text only the expression “current sensors” is used 88 89 3.2 90 fixing device 91 device to fix the position of a conductor in relation to the current sensors 92 93 3.3 94 measurement category 95 coordination of maximum transients to the working voltage according to IEC 61010-1 96 97 3.4 98 variation E11 99 variations due to external low frequency magnetic fields. 100 101 102 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 61557-13 CD © IEC:2008 5 85/342/CD 3.5 103 variation E12 104 variation due to load current during measurement using the differential method (see Annex A Figure A.2) 105 106 3.6 107 variation E13 108 variation due to touch current caused by common mode voltage during hand-manipulation 109 110 3.7 111 variation E14 112 variation due to frequency 113 114 3.8 115 variation E15 116 repeatability of the measurement readings due to at least 10 open / close cycles 117 118 3.9 119 operating class 120 performance class defining the influence of external low frequency magnetic fields on the current sensors 121 (see 4.2) 122 123 3.10 124 leakage current 125 current driven by active conductors of a distribution system and/or loads to earth and/or protective 126 conductors 127 128 IEV 195-05-15, modified 129 130 3.11 131 load current 132 current flowing through the line conductor/s 133 134 3.12 135 rated burden 136 the value of the burden on which the accuracy requirements of a specification are based 137 138 IEV 321-01-26 139 140 Requirements 141 General 142 The following requirements as well as those given in IEC 61557-1 shall apply. 143 Current sensors shall comply with IEC 61010-2-032. 144 145 Current sensors according to this standard shall have the ability to measure leakage currents from 1 mA 146 to 10 A a.c. and/or d.c. as a minimum and shall be designed for a load current of at least 60 A. 147 148 The resolution shall be 0.1 mA a.c. and/or d.c or better. 149 150 The indicated current values shall be r.m.s. values. 151 152 The frequency range of the current sensors shall include the range beginning at 40 Hz up to the third 153 harmonic of the rated mains frequency at the minimum. 154 NOTE 1 For railway applications a frequency range beginning at 15 Hz is recommended. 155 NOTE 2 For industrial applications a frequency range up to 1 kHz is recommended. 156 NOTE 3 For testing the leakage current of appliances a measuring range starting at 0.1 mA with a resolution of 0.01 mA is recommended. 157 158 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:46, Uncontrolled Copy, (c) BSI 61557-13 CD © IEC:2008 6 85/342/CD Operating classes 159 General 160 According to their sensitivity for low frequency magnetic fields according to EN 61000-4-8 within the 161 range of 15 Hz up to 400 Hz current sensors are classified into 3 operating classes. 162 163 Operating cla
