1、BRITISH STANDARD BS 5126-4: 1993 Mining type flameproof supply and control units for use systems up to 1100V Part 4: Specification for air-cooled transformers to power drilling machinesBS5126-4:1993 This British Standard, having been prepared under the directionof the Mining RequisitesStandards Poli
2、cy Committee, was published underthe authority of the Standards Board and comesintoeffect on 15December 1993 BSI 09-1999 First published November 1982 Second edition December 1993 The following BSI references relate to the work on this standard: Committee reference MRE/16 Draft for comment 92/76105
3、DC ISBN 0 580 22424 4 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 MRE/16, upon which the following bodies were represented: Association of British Mining Equ
4、ipment Companies British Coal Corporation Health and Safety Executive Amendments issued since publication Amd. No. Date CommentsBS5126-4:1993 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Information and requirements to b
5、e agreed and to be documented 2 5 Service conditions 2 6 Rated values 3 7 Design and construction 3 8 Verification and tests 9 9 Marking 10 Figure 1 Outline of enclosures showing arrangements for earthingterminalsand skid couplings 11 Figure 2 Busbar chamber end flange 12 Figure 3 Busbar interconnec
6、ting trunk with cover plate 13 Figure 4 650/1100 V busbar interconnecting adaptor trunk 14 Figure 5 650/1100 V skid coupling plate 15 Figure 6 End cover for busbar chamber 16 Figure 7 Example of outgoing cable fittings 17 Figure 8 Envelope dimensions for padlocks 18 Table 1 Creepage distance and cle
7、arance 8 List of references 20BS5126-4:1993 ii BSI 09-1999 Foreword This Part of BS 5126 has been prepared under the direction of the Mining Requisites Standards Committee. It supersedes BS 5126-4:1982, which is withdrawn. This revision updates the standard to reflect todays usage for1100V mining ty
8、pe 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 units in which the essential apparatus are air-cooled transformers to power drilling machines, whilst Parts 1, 2 and 3 cover direct-on-l
9、ine motor starter units, circuit breaker units, and lighting transformer units, 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 E
10、lectrotechnical Commission) criteria 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 immu
11、nity from legal obligations. Attention 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
12、 safety requirements on the manufacturer and the user. The addresses of the recognized certification authorities in the United Kingdom for Group I (Mines susceptible to firedamp) apparatus are: Health and Safety Executive Mining Equipment Certification Service Harpur Hill, Buxton, Derbyshire, SK17 9
13、JN SIRA Certification Service Saighton 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 inc
14、orporated. This will be indicated in the amendment table on the inside front cover.BS5126-4:1993 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 on1100V three-phase a.c. circuits containi
15、ng three-phase transformers intended for supplying electrically operated drilling machines. 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
16、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 uniformity of clause arrangements is maintained. At subclause level, because of the different purp
17、oses 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. NOTE 2The figures in this standard show only those features and dimensions essential for
18、 function and interchangeability. Dimensions are in millimetres. Untoleranced values less than100mm are 0.15mm and those greater than100mm are 0.25mm. 2 References 2.1 Normative references This Part of BS 5126 incorporates, by reference, provisions from specific editions of other publications. These
19、 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 BS 5126 only when incorporated in it by updating or revision. 2.2 Informative references This P
20、art 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 reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS 5
21、126, 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 gear, designed primarily for use underground NOTE 1In this Part of BS 5126, the term “unit” has
22、 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 a three-phase air-cooled transformer with associated equipment to provide a supply for drilling and other similar low voltage machines. 3.2
23、 switch disconnector (isolating switch) a switch which isolates a circuit and is capable of breaking not less than its rated current at rated voltage 3.3 cable half coupler (flit plug) a detachable cable sealing box utilizing contact tubes and pins to facilitate ready connection to, or disconnection
24、 from, a similar unit or other apparatus 3.4 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 3.5 cab
25、le 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 cable gland for attaching the cable to the box, together with any terminals provided for connection to
26、 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 3.6 detachable cable sealing box a cable sealing box which can be detached from associated apparatus without disturbing the sealing of the cable 3.7 restrained plug
27、 and socket a plug and socket in which the two portions are engaged, retained and disengaged by means of a manually operated device 3.8 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
28、 disengaged from the socket without the use of a tool 1) The terms in brackets are those commonly used in practice.BS5126-4:1993 2 BSI 09-1999 3.9 overcurrent protection a device that causes the circuit being protected to be automatically disconnected from the supply when the current exceeds a prede
29、termined value NOTEThe preferred term “overcurrent” 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. 3.10 instantaneous short circuit protection a device that causes the circuit being
30、protected to be automatically disconnected from the supply without intentional time delay when the current exceeds a predetermined value 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 pu
31、rchaser 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) the number and date of this British Standard, i.e. BS 5126-4:1993; b
32、) the service conditions, if other than those specified in clause 5; c) information relating to the drill/motor to be controlled, where known: 1) full load current or rated output of the drill/motor in kilowatts; 2) any information concerning special conditions likely to affect the performance of th
33、e transformer and contactor; d) any information concerning special conditions likely to affect the performance of the unit; e) the voltage, if less than 1100 V (see 6.1); f) the rated frequency of the supply system and its deviation if greater than 2 Hz (see 6.2); g) the no-load output voltage (see
34、6.3); h) the rated kilovolt-ampere output (see 6.4); i) the rated thermal current of busbars (see 6.5); j) whether two or more units are to be coupled together (see 7.4); k) whether provision for incoming and throughgoing cable fittings is required at one or both ends of the unit, and the type of fi
35、tting required (see 7.6.1); l) the type of outgoing cable fittings, together with the number, if any, of the auxiliary cable fittings needed; the control and interlock 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
36、 7.6.2); m) whether secondary means of isolation are to be fitted (see 7.8.2); n) whether any auxiliary circuits are to be connected across the power circuit (see 7.10.4); o) live compartment indication in the switch disconnector chamber (see 7.14); p) whether voltage-free auxiliary contacts are to
37、be fitted and whether they are to be used for control (see 7.21); q) the testing authority for type tests, if other than the manufacturer (see 8.1.2); r) the certifying authority, if other than a UK authority (see foreword). 4.2 Items to be agreed between the contracting parties The following items
38、to be agreed between the contracting 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
39、 and verified. a) additional protection to take account of overloading (see 7.10.1.1 and 7.10.1.3); b) whether earth fault electrical lockout is to be fitted (see 7.10.3); c) pilot-to-earth test facility (see 7.10.6); d) the form of control, if other than specified in7.11; e) provision of a test fea
40、ture (see 7.14.2); f) the terminals to be marked and the information to be displayed (see 9.2); g) the form of the diagrams (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 oth
41、erwise specified by the purchaser see 4.1 b), these service conditions shall be not more severe than the following. a) Ambient 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 a
42、ltitude at the site of installation not exceeding 2000m(6600ft.) above sea-level.BS5126-4:1993 BSI 09-1999 3 6 Rated values 6.1 Supply voltage The maximum rated supply voltage shall be1100V. Units shall operate normally within the limits 10 % and +6 % of the declared rated supply voltage. Voltages l
43、ess than 1100V shall be specified by the purchaser see 4.1 e). 6.2 Supply frequency Units shall have a rated supply frequency within the range40Hz to62Hz. The purchaser shall state the supply frequency required, and its deviation if greater than 2Hz, on the enquiry and/or order see 4.1 f). NOTEThe s
44、tandard frequency is50Hz. The normal deviation is not greater than 2Hz. 6.3 Output voltage Unless otherwise specified by the purchaser see4.1 g), the rated no-load output voltage shall be125V. 6.4 Kilovolt-ampere output Unless otherwise specified by the purchaser see4.1 h), the rated kilovolt-ampere
45、 output shall be one of the following: a) 1.25 kVA for single circuit units; b) 2.5 kVA for double circuit units. 6.5 Thermal current of busbars Unless otherwise specified by the purchaser see4.1 i), the rated thermal current of busbars shall be one of the following: a) 300 A; b) 400 A. 7 Design and
46、 construction 7.1 General The flameproof parts of a unit supplied in accordance with this standard shall conform to one of the following standards: a) BS 4683-2:1971; b) BS 5501-5:1977; c) BS 6709:1986; for Group I enclosures, with fittings in accordance with 7.4, 7.5 and 7.6. However, units designe
47、d and certified before the date of publication of this standard, which have been certified as flameproof in accordance with BS229 for Group I gas (methane/firedamp), shall be deemed to conform to this standard provided that the requirements of all other clauses are met. The design and construction o
48、f units shall minimize the risk of inadvertent closure of relays or contactors arising from either: 1) pressure changes within the enclosure; or 2) changes in the parameters of electronic components or programmable electronic systems due to variations in temperature or electrical interference. Any c
49、ircuits required to be intrinsically safe shall conform to BS 1259:1958 appropriate to Class 1, or BS5501-7:1977 appropriate to Group I. NOTE 1Where a unit conforming to this standard and to BS5501 is to be directly connected to apparatus conforming to BS229 or BS1259 or BS4683, it may be necessary to construct the unit such that it conforms to BS6709. NOTE 2Where a unit is not to be connected as in note 1, in order to promote the increasing use of BS5501 in parallel with the progressive phasing out of Group I apparatus conformi
