1、BRITISH STANDARD BS 5126-2: 1993 Mining type flameproof supply and control units for use on systems up to1100 V Part 2: Specification for circuit breaker unitsBS5126-2:1993 This British Standard, having been prepared under the directionof the Mining RequisitesStandards Policy Committee, was publishe
2、d underthe authority of the Standards Board and comesintoeffect on 15 December 1993 BSI 09-1999 First published November 1976 Second edition December 1993 The following BSI references relate to the work on this standard: Committee reference MRE/16 Draft for comment 89/79378 DC ISBN 0 580 22422 8 Com
3、mittees responsible for this BritishStandard The preparation of this British Standard was entrusted by the Mining Requisites Standards Policy Committee (MRE/-) to Technical Committee MRE/16, upon which the following bodies were represented: Association of British Mining Equipment Companies British C
4、oal Corporation Health and Safety Executive Amendments issued since publication Amd. No. Date CommentsBS5126-2:1993 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword 2 1 Scope 1 2 References 1 3 Definitions 1 4 Information and requirements to be agreed and to be document
5、ed 2 5 Service conditions 3 6 Rated values 3 7 Design and construction 3 8 Verification and tests 10 9 Marking 10 Figure 1 Outline of enclosures showing arrangements for earthing terminals and skid couplings 12 Figure 2 Busbar chamber end flange 13 Figure 3 Busbar interconnecting trunk with cover pl
6、ate 14 Figure 4 650/1100 V busbar interconnecting adaptor trunk 15 Figure 5 650/1100 V skid coupling plate 16 Figure 6 End cover for busbar chamber 17 Figure 7 Example of outgoing cable fittings 18 Figure 8 Envelope dimensions for padlocks 19 Table 1 Circuit breaker performance 7 Table 2 Creepage di
7、stance and clearance 10 List of references 20BS5126-2:1993 ii BSI 09-1999 Foreword This Part of BS 5126 has been prepared, under the direction of the Mining Requisites Standards Policy Committee. It supersedes BS 5162-2:1976 which is withdrawn. This revision updates the standard to reflect todays us
8、age of 1100 V mining type flameproof supply and control units (commonly known in the UK as“gate-end boxes”) and takes account of expected future development. This Part of BS 5126 covers circuit breaker units, whilst Parts 1, 3 and 4 cover direct-on-line motor starter units, lighting transformer unit
9、s and units to power drilling machines, respectively. All have standard busbar and other fixing dimensions, enabling the different units to be fastened together to form a switchboard. This standard is arranged to be in close alignment with IEC (International Electrotechnical Commission) criteria for
10、 various electrical features. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Attention i
11、s drawn to the Health and Safety at Work etc. Act 1974 1, the Mines and Quarries Act 1954 2, the Regulations made under these Acts, and also any other appropriate statutory requirements or byelaws. These place responsibility for complying with certain specific safety requirements on the manufacturer
12、 and the user. The addresses of the recognized certification authorities in the United Kingdom for Group I (for mines susceptible to firedamp) apparatus are: Health and Safety Executive Mining Equipment Certification Service Harpur Hill, Buxton, Derbyshire, SK17 9JN SIRA Certification Service Saight
13、on Lane Saighton Chester, CH3 6EG Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated i
14、n the amendment table on the inside front cover.BS5126-2:1993 BSI 09-1999 1 1 Scope This Part of BS 5126 specifies requirements for flameproof supply and control units designed primarily for use in the coal mining industry on1100 V three-phase a.c. circuits and dual-voltage1100 V/550 V units with ci
15、rcuit breakers for the control and protection of power circuits. Provision is also made for operation on other voltages, where required. In addition to the definitive requirements, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both th
16、e definitive requirements and the documented items have to be satisfied. NOTE 1To facilitate cross-reference and subject location recall between the Parts of this standard, a uniformity of clause arrangements is maintained. At subclause level, because of the different purposes and individual technic
17、al features of the four types of control unit, some differences in title and/or subclause arrangements have been unavoidable, but have been made without disturbing the general pattern. NOTE 2The figures in this standard show only such features and dimensions essential for function and interchangeabi
18、lity. Dimensions are in millimetres. Untoleranced values less than100 mm are 0.15 mm and those greater than 100 mm are 0.25 mm. 2 References 2.1 Normative references This Part of BS 5126 incorporates, by reference, provisions from specific editions of other publications. These normative references a
19、re cited at the appropriate points in the text and the publications are listed on page 20. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS 5126 only when incorporated in it by updating or revision. 2.2 Informative references This Part of BS 5126 refers t
20、o other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS 51126, the following def
21、initions apply. 1) 3.1 supply and control unit (gate-end box) a flameproof enclosure containing electrical apparatus, such as transformer, control gear, switchgear and/or protective gear, designed primarily for use underground NOTE 1In this Part of BS 5126, the term “unit” has in many instances been
22、 used in abbreviation of “supply and control unit”. NOTE 2For the purposes of this Part of BS 5126, the enclosed apparatus is essentially an electrical circuit breaker with associated equipment. 3.2 circuit breaker a mechanical switching device, capable of making, carrying and breaking currents unde
23、r normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short circuit NOTEA circuit breaker is usually intended to operate infrequently, although some types are suitable for frequent operation. 3.3
24、disconnector (isolator) a mechanical device capable of opening or closing a circuit under conditions of no load or negligible current 3.4 cable half coupler (flit plug) a detachable cable sealing box utilizing contact tubes and pins to facilitate ready connection to, ordisconnection from, a similar
25、unit or other apparatus 3.5 cable coupler adaptor a device used to connect either a cable half coupler or other type of cable termination to apparatus. If used to connect a cable half coupler, it may either be separate from, or be integral with, the enclosure of the apparatus 3.6 cable sealing box a
26、 device designed to receive and protect the end of the cable, with provision for sealing the conductors and the insulating material of the cable with a filling compound and having a cable gland for attaching the cable to the box, together with any terminals provided for connection to the conductors
27、of the cable within the box. The box may form part of, or be detachable from, the apparatus with which it is associated 3.7 detachable cable sealing box a cable sealing box that can be detached from associated apparatus without disturbing the sealing of the cable 1) The terms in brackets are those c
28、ommonly used in practice.BS5126-2:1993 2 BSI 09-1999 3.8 dual-voltage unit a unit capable of operating from either of two selected supply voltages, the preferred values of which are 1100 V and 550 V 3.9 restrained plug and socket a plug and socket in which the two portions are engaged, retained and
29、disengaged by means of a manually operated device 3.10 bolted cable plug and socket a plug and socket designed to be held together by two or more bolts or screws, or studs and nuts in such a way that the plug cannot be disengaged from the socket without the use of a tool 3.11 sequence interlocking m
30、eans by which operation is made dependent on the fulfilment of other prescribed conditions 3.12 overcurrent protection a device that causes the circuit being protected to be automatically disconnected from the supply when the current exceeds the predetermined value NOTEThe preferred term “overcurren
31、t” is used throughout this standard, but in certain other British Standards to which reference is made, the term “overload” may be used when referring to these devices. 3.13 inverse time lag overcurrent release a device that retards the tripping of the circuit breaker by a time inversely dependent u
32、pon the magnitude of the overcurrent 3.14 undervoltage release a device that causes the circuit breaker to open the circuit if the voltage falls below a predetermined value 3.15 shunt release a device that causes the circuit breaker to open when energized from a source of voltage that may be indepen
33、dent of the circuit in which the circuit breaker is connected 4 Information and requirements to be agreed and to be documented 4.1 Information to be supplied by the purchaser The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specifi
34、ed throughout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified. a) the number and date of this British Standard, i.e. BS 5126-2:1993; b) the service conditions, if other than those specified in clause 5; c) inf
35、ormation relating to the circuit breaker to be controlled, where known: 1) the full load current rating of the circuit breaker; 2) any information concerning special conditions likely to affect the performance of the circuit breaker; d) any information concerning special conditions likely to affect
36、the performance of the unit; e) whether the unit is to have dual-voltage and, if so, the rated supply voltages (see 6.1); f) the rated frequency of the supply system and its deviation if greater than 2 Hz (see 6.2); g) the rated thermal load current (see 6.3); h) the rated thermal current of busbars
37、 (see 6.4); i) whether two or more units are to be coupled together (see 7.4); j) whether provision for incoming and throughgoing cable fittings is required at one or both ends of the unit, and the type of fitting required (see 7.6.1); k) the type of outgoing cable fittings, together with the number
38、, if any, of the auxiliary cable fittings needed and the control and interlock circuit for the restrained plug and socket of the outgoing cable, if other than one conforming to BS3101:1986 and BS 7202:1989 (see 7.6.2); l) whether provision is necessary for the fitting of auxiliary cable glands (see
39、7.6.3); m) whether short circuit protection is to be omitted (see 7.10.2); n) whether any auxiliary circuits are to be connected across the power circuit (see 7.10.4); o) whether provision for a remote opening function is to be omitted and whether a telemetry opening function is to be provided (see
40、7.11.2); p) the type of earth fault protection (see 7.10.6);BS5126-2:1993 BSI 09-1999 3 q) whether provision for a remote opening function is to be omitted and whether a telemetry opening function is to be provided (see 7.11.2); r) whether either the local or remote closing function is to be omitted
41、 and whether a telemetry closing function is to be provided (see 7.11.3); s) the instrumentation (see 7.14); t) live compartment indication in the switch disconnector chamber (see 7.16); u) whether voltage-free auxiliary contacts are to be fitted and whether they are to be used for control (see 7.21
42、); v) the testing authority for type tests, if other than the manufacturer (see 8.1.2); w) the certifying authority, if other than aUKauthority (see foreword). 4.2 Items to be agreed between the contracting parties The following items to be agreed between the contracting parties, which are specified
43、 in the clauses referred to, shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified. a) additional protection to take account of overlo
44、ading (see 7.10.1); b) the value of the prospective earth fault current (see 7.10.6); c) whether earth fault electrical lockout is to be omitted (see 7.10.7); d) the terminals to be marked and the information to be displayed (see 9.2); e) the form of the diagrams (see 9.5). 5 Service conditions With
45、in the limits of their ratings, units shall be suitable for use in installations operating under the intended service conditions. Unless otherwise specified by the purchaser see 4.1 b), the service conditions shall be not more severe than the following. a) Ambient temperature: a peak value not excee
46、ding 40 C with an average value not exceeding 35 C over 24 h periods. The lower limitof the ambient temperature is 5 C. b) Altitude: an altitude at the site of installation not exceeding 2000 m (6600 ft) above sea-level. 6 Rated values 6.1 Supply voltage The maximum rated supply voltage shall be 110
47、0 V. Units shall operate normally within the limits of 10 % and + 6 % of the declared rated supply voltage. The purchaser shall state on the enquiry and/or order whether the unit is to have dual-voltage see4.1 e). In this case, unless otherwise specified by the purchaser, the rated supply voltages s
48、hall be1100 V and 550 V. 6.2 Supply frequency Units shall have a rated supply frequency within the range 40 Hz to 62 Hz. The purchaser shall state the supply frequency required, and its deviation if greater than 2 Hz, on the enquiry and/or order see 4.1 f). NOTEThe standard frequency is 50 Hz. The n
49、ormal deviation is not greater than 2 Hz. 6.3 Thermal load current The maximum rated thermal load current of the unit, excluding outgoing cable fittings, shall be the current rating. Unless otherwise specified by the purchaser see 4.1 g), the rated thermal load current of the unit shall be 300 A. NOTEThe duty rated current may be less than the maximum rated thermal load current depending upon the lowest rated component fitted. 6.4 Thermal current of busbars The rated thermal current of busbars shall be stated. Unless otherwise s
