1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22037-2 SANS 474:2009 Edition 1.1 NRS 057:2009 Edition 1.1SOUTH AFRICAN NATIONAL STANDARD Code of practice for electricity metering This n
4、ational standard is the identical implementation of NRS 057:2009 and is adopted in terms of a Memorandum of Agreement between the Electricity Suppliers Liaison Committee and the SABS Standards Division. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001
5、Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS. SANS 474:2009 Edition 1.1 NRS 057:2009 Edition 1.1 Table of changes Change No. Date Scope Amdt.1 2009 Amended to add normative refere
6、nces, definitions and a note with regard to the design template, to align the calibration intervals for electronic and electromechanical metering equipment, to exclude prepayment meters from comparisons with meters and meter registers to the billing systems, to change the requirements for meter numb
7、ering format, to add items to the design checklist and to the glossary of terms. National foreword This South African standard was prepared by a working group of the Electricity Suppliers Liaison Committee and adopted by National Committee SABS TC 62, Electrical measurements, in accordance with proc
8、edures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. The adoption has been done in terms of a Memorandum of Agreement between the Electricity Suppliers Liaison Committee and the SABS Standards Division. This SANS document was published in March 2009. This SANS
9、document supersedes SANS 474:2006 (edition 1). A vertical line in the margin shows where the text has been technically modified by Amendment No. 1 .This standard may only be used and printed by approved subscription and freemailing clients of the SABS. CODE OF PRACTICE FOR ELECTRICITY METERING N R S
10、 NRS 057:2009Edition 1.1 SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. This specification is issued by the Standardization section, Eskom, on behalf of the User Group given in the foreword Table of changes Change No. Date Text a
11、ffected Amdt 1 2009 Amended to add normative references, definitions and a note with regard to the design template, to align the calibration intervals for electronic and electromechanical metering equipment, to exclude prepayment meters from comparisons with meters and meter registers to the billing
12、 systems, to change the requirements for meter numbering format, to add items to the design checklist and to the glossary of terms. Correspondence to be directed to Printed copies obtainable from The NRS Projects Manager SABS Standards Division The Industry Association Resource Centre Private Bag X1
13、91 Eskom Pretoria 0001 Private Bag X13 Halfway House 1685 Telephone: (012) 428 7911 Telephone : (011) 651 6842 Fax : (012) 344 1568 Fax : (011) 651 6827 E-mail : salessabs.co.za E-mail : nrseskom.co.za Website: http:/www.nrs.eskom.co.za Website : http:/www.sabs.co.za COPYRIGHT RESERVED Printed in th
14、e Republic of South Africa by the SABS Standards Division 1 Dr Lategan Road, Groenkloof, Pretoria SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. NRS 057:2009 Foreword This code of practice was prepared on behalf of the Electricit
15、y Suppliers Liaison Committee (ESLC). This code of practice was prepared by a working group which, at the time of preparation of amendment 1, comprised the following members: E Louw (Chairman) Eskom (Distribution) J Belgrove Eskom PTM (Witbank) H Essop City of Cape Town F Fryer Ekurhuleni Municipali
16、ty H Groenewald Eskom (IARC) P Johnson (Project Leader) Eskom (NRS Project Management Agency) H Wouda City Power Johannesburg S Makhathini National Energy Regulator of South Africa E Makwarela Eskom (IARC) MG Mashinini eThekwini Electricity SJ van den Berg CENTLEC C van der Westhuizen CENTLEC An Int
17、erest Group (IG) was consulted on the contents of this code of practice and the comments were incorporated where the working group was in agreement. The IG comprised the following members: H Hayes Landis and Gyr S.A. (Pty) Ltd D Henriksen Elster Kent Metering G Mellis Power Meter Technics I Mohamed
18、Actaris Measurement C Nell IST OTOKOV (Pty) Ltd M Phaloane SANAS M Pillay SANAS V Rengecas Valucal Test customers; licensees; metering service providers; auditors; testing and calibration laboratories; The South African National Accreditation Service (SANAS). The National Energy Regulator (NERSA) Th
19、e NERSA is the statutory body that oversees the electricity market and the regulations that control it. The NERSA has issued a distribution metering code and a transmission code grid code which contain the regulations that require compliance with NRS 057. NERSA has declared compliance with NRS 057 t
20、o be a licence condition for all licensees. Customers Customers rights and obligations have been defined in the distribution metering code and the transmission code. Procedures for customers to follow in cases of complaints of the level of service provided by a licensee are covered in NRS 047. Licen
21、sees Licensees, as part of their licence conditions, are required by the NERSA to comply with either the metering code of the transmission code grid code or the distribution code. These codes require compliance with NRS 057. Metering service providers A Metering Service Provider (MSP) is a legal ent
22、ity that has been contracted by one or more licensees to perform specific work on the licensees metering installations. It is envisaged that the industry might maintain a register of MSPs that have demonstrated their competence to perform specific work in compliance with NRS 057. MSPs are required t
23、o employ staff who have been appropriately trained, as set out in this code of practice. SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. NRS 057:2009 Auditors The NERSAs distribution metering code covers the requirements for audit
24、ing of customers metering installations. The South African National Accreditation System (SANAS) SANAS has been established by Government as the single national accreditation body that gives formal recognition that laboratories, certification bodies, inspection bodies, proficiency testing scheme pro
25、viders and good laboratory practice (GLP) test facilities are competent to carry out specific tasks. SANAS certificates are a formal recognition that an organization is competent to perform specific tasks. SANAS is responsible for the accreditation of certification bodies to ISO/IEC Guides 62, 65 an
26、d 66 (and the International Accreditation Forum interpretation thereof) and the accreditation of laboratories (testing and calibration) to SANS 17025. Inspection bodies are accredited to SANS 17020. The process of registering laboratories either as accredited test laboratories (involving manufacture
27、rs and their testing agents), or as accredited calibration laboratories (involving licensees or their calibration agents) will need to be agreed upon with SANAS. Such an agreement will involve all stakeholders, including the relevant local authorities. This will be an integral part of the progressiv
28、e implementation of NRS 057. For more information concerning SANAS accreditation, visit the SANAS website www.sanas.co.za. Keywords code of practice, current transformers, electricity billing, electricity metering, electricity metering installations, electricity meters, instrument transformers, volt
29、age transformers. SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 1 NRS 057:2009 Contents Page 1 Scope 3 2 Normative references 3 3 Terms, definitions and abbreviations 4 4 Requirements of metering installations . 11 4.1 Equipment
30、 standards . 11 4.2 Metering system . 11 4.3 General requirements 11 4.4 Requirements of metering equipment. 12 4.5 Metering installation design . 17 4.6 Metering equipment installation . 19 4.7 Compliance of the entire metering installation 20 4.8 Automated meter reading (AMR) for large power users
31、 . 23 4.9 Sealing of metering equipment 24 4.10 Time offset 24 5 Billing data collection and transmission . 24 5.1 Frequency of meter reading 24 5.2 Meter data retention period . 24 5.3 Data to be downloaded 24 5.4 Data validation . 25 5.5 Data transmission 26 5.6 Confidentiality and security 27 Ann
32、ex A (normative) Meter numbering format . 29 Annex B (normative) Design checklist for recording of information during design, installation and commissioning 33 Annex C (normative) Categories of metering installations and classification of meter worker qualifications 39 Annex D (informative) Glossary
33、 of terms for metering . 42 Bibliography . 63 SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.NRS 057:2009 2 CODE OF PRACTICE FOR ELECTRICITY METERING 1 Scope 1.1 This code of practice specifies the procedures and standards to be a
34、dhered to by electricity licensees and their agents in operating and servicing new and existing metering installations which are to be used for billing purposes. The code of practice is applicable to metering installations in their entirety, including all measuring transformers, wiring, cabling, met
35、ering panel construction, active and reactive meters, data loggers, and associated test facilities. 1.2 This code of practice sets out best practices to be adopted by electricity licensees, wherever practicable. (See NOTES 1 and 2.) NOTE 1 Some requirements might be the subject of mandatory complian
36、ce through reference in codes regulated by the NERSA. In cases where compliance with mandatory requirements will not be practicable, the NERSA should be approached for exemption. NOTE 2 This code of practice should be interpreted as applicable to new and refurbished metering systems. Practices in pl
37、ace before the publication of this code of practice might be deemed to be acceptable for an agreed time frame. 1.3 This code of practice specifies requirements for the initial calibration and certification of metering equipment and compliance testing of metering installations. It describes procedure
38、s to ensure that metering installations continue to comply with standards and sets out steps to be taken to reconfirm compliance after any modifications to the metering installation or when certification of any equipment has expired. 1.4 This code of practice specifies procedures for the manipulatio
39、n and storage of metering data. Metering installations are categorized, and for each category the qualifications required for meter workers are specified. 1.5 This code of practice specifies a standard format for the unique numbering of meters. 1.6 This code of practice does not attempt to cover all
40、 possible variations in metering installations. Where features additional or alternative to those specified in this code of practice are required, they will be appropriately tested or inspected (or both) to confirm the integrity of the overall metering installation. 2 Normative references The follow
41、ing documents contain provisions which, through reference in this text, constitute provisions of this code of practice. All documents are subject to revision and, since any reference to a document is deemed to be a reference to the latest edition of that document, parties to agreements based on this
42、 code of practice are encouraged to take steps to ensure the use of the most recent editions of the documents listed below. Information on currently valid national and international standards and specifications can be obtained from the SABS Standards Division. NRS 047-1, Electricity supply Quality o
43、f service Part 1: Minimum standards. SANS 474:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. 3 NRS 057:2009 NRS 071, Automated meter reading for large power users. SANS 1524-1, Electricity Payment Systems Part 1: Prepayment meters. Amdt 1
44、 SANS 1799, Watt-hour meters AC electronic meters for active energy. SANS 7812-1/ISO/IEC 7812-1, Identification cards Identification of issuers Part 1: Numbering system. SANS 15417/ISO/IEC 15417, Information technology Automatic identification and data capture techniques Bar code symbology specifica
45、tion Code 128. SANS 60044-1/IEC 60044-1, Instrument transformers Part 1: Current transformers. SANS 60044-2/IEC 60044-2, Instrument transformers Part 2: Inductive voltage transformers. SANS 60044-3/IEC 60044-3, Instrument transformers Part 3: Combined transformers. SANS 60044-5/IEC 60044-5, Instrume
46、nt transformers Part 5: Capacitor voltage transformers. SANS 62051/IEC 62051(SABS IEC 62051), Electricity metering Glossary of terms. SANS 62052-11/IEC 62052-11, Electricity metering equipment (a.c.) General requirements, tests and test conditions Part 11: Metering equipment. SANS 62053-11/IEC 62053
47、-11, Electricity metering equipment (a.c.) Particular requirements Part 11: Electromechanical meters for active energy (classes 0,5, 1 and 2). SANS 62053-21/IEC 62053-21, Electricity metering equipment (a.c.) Particular requirements Part 21: Static meters for active energy (classes 1 and 2). SANS 62
48、053-22/IEC 62053-22, Electricity metering equipment (a.c.) Particular requirements Part 22: Static meters for active energy (classes 0,2 S and 0,5 S). SANS 62053-23/IEC 62053-23, Electricity metering equipment (a.c.) Particular requirements Part 23: Static meters for reactive energy (classes 2 and 3
49、). 3 Terms, definitions and abbreviations For the purposes of this code of practice, the terms, definitions and abbreviations given in SANS 62051 and the following apply. NOTE 1 Some terms or definitions from other standards or documents have been repeated in 3.1 for the sake of convenience. Reference to such publications is given in square brackets after the definition. NOTE 2 NRS 057-1:2001 included a glossary of metering terms. Terms and definitions from that glossary that have not been used normatively i
