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1、BRITISH STANDARD BS 6867:1987 Code of practice for Maintenance of electrical switchgear for voltages above 36 kV UDC 621.316.3.027.3.004.5 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 This British Standard, having been prepar
2、ed under the direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 October 1987 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PEL/92 Draft for comment 83
3、/26114 DC ISBN 0 580 16141 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/92, upon which the following bodies were represented: ASTA Certification Ser
4、vices Association of Supervisory and Executive Engineers British Railways Board Copper Development Association Department of the Environment, Property Services Agency Electrical Installation Equipment Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales ERA Technology L
5、td. GAMBICA (BEAMA) Ltd. Health and Safety Executive National Economic Development Office Transmission and Distribution Association (BEAMA) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Coal British Gas plc Amendments issued sin
6、ce publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 0Introduction1 1Scope1 2Definitions1
7、 Section 2. Safety 3Responsibility3 4Procedures for safe systems at work3 5Isolation and access for maintenance3 6Preparing for work4 7Fire extinguishing equipment4 8Testing5 9Disposal of scrap5 Section 3. Common requirements relating to maintenance 10Manufacturers instructions6 11Newly commissioned
8、 equipment6 12Frequency of maintenance6 13Records7 14Replacement parts7 15Cleanliness7 16Marking of covers and connections8 17Quality of connections8 18Maintenance and testing of insulation8 19Maintenance of safety earthing continuity9 20Shutters, locking devices etc.9 21Interlocks9 22Ventilation10
9、23Equipment heating and lighting10 24Lifting devices10 25Tripping and closing supplies10 26Equipment tools, spares and test instruments10 27Conclusion of maintenance10 Section 4. Additional requirements relating to the maintenance of specific items 28Circuit-breakers11 29Switches19 30Disconnectors a
10、nd earthing switches20 31Busbars and busbar chambers20 32Relays20 33Protective, measuring and control transformers21 34Cable boxes and terminations22 35Compressed air plant22 36Ancillary and auxiliary circuits22 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontro
11、lled Copy, (c) BSI BS 6867:1987 ii BSI 07-1999 Page Appendix A Typical example of safety rules23 Appendix B Graphical illustration of some of the terms and definitions given in clause 238 Appendix C Example of maintenance record card39 Appendix D General recommendations relating to personal hygiene
12、and safety at SF6 installations40 Appendix E Recommendations for the content of the switchgear manufacturers handbook42 Figure 1 Graphical representation of terms and conditions given in clause 238 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19
13、:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 BSI 07-1999iii Foreword This code of practice has been prepared under the direction of the Power Electrical Engineering Standards Committee. It is a revision of those clauses of CP 1011:1961 and BS 5405:1976 covering equipment rated above 3
14、6 kV. BS 6423:1983 covers voltages up to 650 V, and BS 6626:1985 covers the range from 650 V to 36 kV. Therefore CP 1011:1961 and BS 5405:1976 are withdrawn. This code of practice represents a standard of good practice and takes the form of recommendations. Attention is drawn to the following: The H
15、ealth and Safety at Work etc. Act 1974 The Health and Safety (First Aid) Regulations 1981 Code of Practice for the Health and Safety (First Aid) Regulations 1981 The Electricity Supply Regulations 1937 The Factories Act 1961 The Electricity (Factories Act) Special Regulations 1908 and 1944 The Mines
16、 and Quarries Act 1954 The Coal and other Mines (Electricity) Regulations 1956 The Quarries (Electricity) Regulations 1956 The Miscellaneous Mines (Electricity) Regulations 1956 The Coal and other Mines (Mechanics and Electricians) Regulations 1965 It is essential that all persons responsible for el
17、ectrical work or operation make themselves acquainted with the appropriate statutory requirements. It has been assumed in the drafting of this British Standard that the execution of its provisions will be entrusted to appropriately qualified and experienced people. Some factors that affect the perfo
18、rmance and safe operation of equipment are dependent on the initial design, associated equipment, environment, location and installation. These should be considered at the appropriate stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British S
19、tandards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 44, an inside back cover and a back cover. Th
20、is standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: shef
21、fieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 BSI 07-19991 Section 1. General 0 Introduction The purpose of this code of practice is to provide in a convenient form guidance on those matters which technical knowledge and experience have shown to
22、 be important in keeping equipment in an acceptable condition. It is intended for the guidance of those actually carrying out the maintenance work as well as for administrative personnel. It is therefore strongly recommended that this code, together with manufacturers instructions for each specific
23、item, be made readily available for all concerned. This code of practice can only draw attention to general issues and the definitive reference for any users particular equipment is the manufacturers handbook. The normally quiescent state of electrical switchgear and some controlgear does not automa
24、tically draw attention to incipient faults, deterioration or danger resulting from neglect and the consequent need for maintenance. It follows therefore that an organized system of routine maintenance will facilitate continued safe and acceptable operation of an electrical system with the minimum ri
25、sk of breakdown and consequent interruption of supply. The best rules and procedures are of no avail unless all persons operating or working on the equipment are thoroughly conversant with them and with the relevant statutory requirements and comply strictly with them. 1 Scope This code of practice
26、covers the maintenance of electrical switchgear having rated voltages above 36 kV. At these voltages the equipment is physically large and overhaul and maintenance is usually carried out on site. For similar reasons in the case of SF6 switchgear the volume of gas is relatively large. Recommended pro
27、cedures for maintenance of the principal components of equipment are included and guidance is also given concerning replacement parts. Particular emphasis is placed on the use of the manufacturers handbook as the definitive reference for any users particular equipment. Reference is made to the preca
28、utions to be observed in order to secure safety of personnel whilst maintenance is in progress. A typical example of safety rules is included in Appendix A. Some comments are also made regarding safety features of equipment and measures to minimize hazards to plant and to ensure continuity of servic
29、e. In addition, notes are given on the subject of electrical testing as the means for detecting insulation weakness or the deteriorating condition of insulation. NOTEThe titles of the publications referred to in this code of practice are listed on the inside back cover. 2 Definitions For the purpose
30、s of this British Standard the following definitions apply. 2.1 switchgear a general term covering switching devices and their combination with associated control, measuring, protective and regulating equipment, and also assemblies of such devices and equipment with associated interconnections, acce
31、ssories, enclosures and supporting structures, intended in principle for use in connection with generation, transmission, distribution and conversion of electric power NOTEThis is identical with the definition given in BS 4727-2:Group 06, where other definitions relating to switchgear may also be fo
32、und. 2.2 high-voltage (HV) above 650 V 2.3 equipment electrical switchgear 2.4 item any part of equipment including a composite unit which can be individually considered 2.5 acceptable condition the condition in which an item is able to meet the requirements of the relevant specification and perform
33、 its required functions NOTESee also Appendix B. 2.6 failure (breakdown) the termination of the ability of an item to perform its required function; failure can be gradual, sudden partial or complete NOTESee also Appendix B. 2.7 maintenance a combination of any actions carried out to retain an item
34、in, or restore it to, an acceptable condition 2.8 routine maintenance maintenance organized and carried out in accordance with a predetermined policy or plan to prevent breakdown or decide the likelihood of an item failing to meet an acceptable condition Licensed Copy: sheffieldun sheffieldun, na, T
35、ue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 2 BSI 07-1999 2.9 non-routine maintenance unplanned maintenance which is not the result of a breakdown 2.10 preventive maintenance maintenance carried out with the objective of preventing breakdown and which may include routi
36、ne or non-routine maintenance NOTESee also Appendix B. 2.11 repair or corrective maintenance maintenance necessary to restore an item to an acceptable condition 2.12 emergency action action which must be taken immediately to avoid serious consequence 2.13 post-fault maintenance maintenance which may
37、 be necessary on switchgear after a specified number of fault clearance operations 2.14 inspection (inspect) a maintenance action comprising a careful scrutiny of an item carried out without dismantling and using all the senses as required to detect anything which causes the item to fail to meet an
38、acceptable condition. They may include an operational check NOTESee 2.18. 2.15 servicing work carried out to ensure that the equipment is kept in an acceptable condition, which usually does not involve any dismantling, and is typically limited to cleaning, adjustment and lubrication 2.16 examination
39、 (examine) an inspection with the addition of partial dismantling as required, supplemented by means such as measurement and non-destructive tests in order to arrive at a reliable conclusion as to the condition of an item 2.17 overhaul work done with the objective of repairing or replacing parts whi
40、ch are found to be below standard by examination, so as to restore the component and/or equipment to acceptable condition 2.18 operational check an action carried out to determine whether an item functions correctly 2.19 test a measurement carried out to determine the condition of an item 2.20 diagn
41、ostic test a comparative measurement carried out to monitor the condition of an item 2.21 manufacturers handbook written information issued by the manufacturer of the equipment which should include guidance and instructions concerning installation, commissioning, operation and maintenance of the equ
42、ipment NOTEThe content of this handbook is outlined in Appendix E. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:19:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6867:1987 BSI 07-19993 Section 2. Safety 3 Responsibility Electrical equipment should be regarded as being capable of givin
43、g rise to danger, not necessarily of an electrical nature, and it is essential that all persons responsible for electrical work make themselves acquainted with the relevant statutory requirements. A list of some relevant publications is included in the foreword. All persons concerned with the mainte
44、nance of equipment should conduct themselves in accordance with the provisions of the statutory requirements and take reasonable care for the health and safety of all those carrying out the work, and of others who may be affected by their acts or omissions at work. A notice giving instructions for t
45、he treatment of persons suffering from electric shock should be affixed in a prominent position in the vicinity in which work on electrical installations will be carried out. It is strongly recommended that all electrical maintenance personnel be trained in the application of resuscitation and know
46、how to summon medical help. 4 Procedures for safe systems at work It is recommended that in all premises, the employer or occupier should formulate and update as needed during the life of the equipment a set of safety rules or procedures, appropriate to the type of electrical installation, covering
47、the safe access for the purpose of maintenance to, and the operation of, the equipment on his premises. (See typical example in Appendix A.) Where the employer or occupier is not competent, the formulation of a set of safety rules may be contracted out to a competent authority. Where switching or ma
48、intenance work has to be done on equipment fed directly from a source of supply not under control of the employer or occupier or the persons actually carrying out the work, then special care is required. It will be necessary for all parties mutually to agree procedures and methods of work in order t
49、o ensure the safety of persons carrying out the work, and for these agreed procedures to be incorporated in the rules and procedures for the installation. Care should also be taken to prevent equipment being worked on becoming energized due to the automatic or inadvertent starting of standby or emergency generators. In addition, the employer or occupier should ensure that precise instructions exist, based on the manufacturers handbook, for the safe handling, maintenance and testing of the equipment. The employer or occupier should also make arrangements for monitoring