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1、BRITISH STANDARD BS 5126-2: 1993 Mining type flameproof supply and control units for use on systems up to 1100 V Part 2: Specification for circuit breaker units Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5126-2:1993 This British Stan
2、dard, having been prepared under the direction of the Mining Requisites Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 December 1993 BSI 09-1999 First published November 1976 Second edition December 1993 The following BSI references r
3、elate to the work on this standard: Committee reference MRE/16 Draft for comment 89/79378 DC ISBN 0 580 22422 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Mining Requisites Standards Policy Committee (MRE/-) to Technical Committee M
4、RE/16, upon which the following bodies were represented: Association of British Mining Equipment Companies British Coal Corporation Health and Safety Executive Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:19 GMT+00:00 2006, Unc
5、ontrolled Copy, (c) BSI BS 5126-2:1993 BSI 09-1999i Contents Page Committees responsibleInside front cover Foreword2 1Scope1 2References1 3Definitions1 4Information and requirements to be agreed and to be documented2 5Service conditions3 6Rated values3 7Design and construction3 8Verification and tes
6、ts10 9Marking10 Figure 1 Outline of enclosures showing arrangements for earthing terminals and skid couplings12 Figure 2 Busbar chamber end flange13 Figure 3 Busbar interconnecting trunk with cover plate14 Figure 4 650/1 100 V busbar interconnecting adaptor trunk15 Figure 5 650/1 100 V skid coupling
7、 plate16 Figure 6 End cover for busbar chamber17 Figure 7 Example of outgoing cable fittings18 Figure 8 Envelope dimensions for padlocks19 Table 1 Circuit breaker performance7 Table 2 Creepage distance and clearance10 List of references20 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:
8、19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5126-2:1993 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 It supersedes BS 5162-2:1976 which is withdrawn.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
9、usage of 1 100 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
10、units 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
11、 for 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. Attenti
12、on is 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 manufact
13、urer 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 Sa
14、ighton Lane Saighton Chester, CH3 6EG Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 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 indica
15、ted in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5126-2:1993 BSI 09-19991 1 Scope This Part of BS 5126 specifies requirements for flameproof supply and control units designed primarily
16、for use in the coal mining industry on 1 100 V three-phase a.c. circuits and dual-voltage 1 100 V/550 V units with circuit 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, th
17、is standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the 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 uniformi
18、ty of clause arrangements is maintained. At subclause level, because of the different purposes and individual technical 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
19、. NOTE 2The figures in this standard show only such features and dimensions essential for function and interchangeability. Dimensions are in millimetres. Untoleranced values less than 100 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
20、5126 incorporates, by reference, provisions from specific editions of other publications. These normative references are 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
21、BS 5126 only when incorporated in it by updating or revision. 2.2 Informative references This Part of BS 5126 refers to 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 refer
22、ence should be made to the latest editions. 3 Definitions For the purposes of this Part of BS 51126, the following definitions 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 g
23、ear, designed primarily for use underground NOTE 1In this Part of BS 5126, the term “unit” has in many instances been 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
24、 equipment. 3.2 circuit breaker a mechanical switching device, capable of making, carrying and breaking currents under 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 circu
25、it breaker is usually intended to operate infrequently, although some types are suitable for frequent operation. 3.3 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 c
26、able sealing box utilizing contact tubes and pins to facilitate ready connection to, or disconnection from, a similar 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 hal
27、f coupler, it may either be separate from, or be integral with, the enclosure of the apparatus 3.6 cable sealing box a 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
28、cable gland for attaching the cable to the box, together with any terminals provided for connection to the conductors 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
29、be detached from associated apparatus without disturbing the sealing of the cable 1) The terms in brackets are those commonly used in practice. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5126-2:1993 2 BSI 09-1999 3.8 dual-voltage uni
30、t a unit capable of operating from either of two selected supply voltages, the preferred values of which are 1 100 V and 550 V 3.9 restrained plug and socket a plug and socket in which the two portions are engaged, retained and disengaged by means of a manually operated device 3.10 bolted cable plug
31、 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 means by which operation is made dependent on the fulfilment of other pre
32、scribed 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 “overcurrent” is used throughout this standard, but in certain other British Standa
33、rds 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 upon the magnitude of the overcurrent 3.14 undervoltage release a device
34、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 independent of the circuit in which the circuit breaker is connected 4 Informat
35、ion 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 specified throughout the standard and the following documented items shall be s
36、atisfied 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) information relating to the circuit breaker to be controlled, where known:
37、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 the performance of the unit; e) whether the unit is to have dual-voltage
38、 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 (see 6.4); i) whether two or more units are to be coupled together (see
39、 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, if any, of the auxiliary cable fittings needed and the control and int
40、erlock circuit for the restrained plug and socket of the outgoing cable, if other than one conforming to BS 3101:1986 and BS 7202:1989 (see 7.6.2); l) whether provision is necessary for the fitting of auxiliary cable glands (see 7.6.3); m) whether short circuit protection is to be omitted (see 7.10.
41、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 7.11.2); p) the type of earth fault protection (see 7.10.6); Licensed C
42、opy: sheffieldun sheffieldun, na, Mon Dec 04 12:23:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5126-2:1993 BSI 09-19993 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 rem
43、ote closing function is to be omitted 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
44、 are to be used for control (see 7.21); v) the testing authority for type tests, if other than the manufacturer (see 8.1.2); w) the certifying authority, if other than a UK authority (see foreword). 4.2 Items to be agreed between the contracting parties The following items to be agreed between the c
45、ontracting parties, which are specified 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) addition
46、al protection to take account of overloading (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 diagra
47、ms (see 9.5). 5 Service conditions Within 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) Ambi
48、ent temperature: a peak value not exceeding 40 C with an average value not exceeding 35 C over 24 h periods. The lower limit of the ambient temperature is 5 C. b) Altitude: an altitude at the site of installation not exceeding 2 000 m (6 600 ft) above sea-level. 6 Rated values 6.1 Supply voltage The
49、 maximum rated supply voltage shall be 1 100 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 see 4.1 e). In this case, unless otherwise specified by the purchaser, the rated supply voltages shall be 1 100 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