1、BRITISH STANDARD BS 6182-1: 1994 Intrinsically safe power supplies for use in coal mines Part 1: Specification for d.c. power supplies UDC 622.33.005:621.3.031:621.311.4.024BS6182-1:1994 This British Standard, having been prepared under the directionof the Mining RequisitesStandards Policy Committee
2、, was published underthe authority of the Standards Board and comes into effect on 15 March 1994 BSI 08-1999 First published September 1982 Second edition March 1994 The following BSI references relate to the work on this standard: Committee reference MRE/25 Draft for comment 90/77414 DC ISBN 0 580
3、22662 X 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/25, upon which the following bodies were represented: Association of British Mining Equipment Compani
4、es British Coal Corporation Council for Electrical Equipment for Flammable Atmospheres (BEAMA) Health and Safety Executive Amendments issued since publication Amd. No. Date CommentsBS6182-1:1994 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References
5、1 3 Definition 1 4 Information and requirements to be agreed and to be documented 1 5 Design and construction 1 6 Marking 5 7 Routine tests 5 Annex A (informative) Guidance on interconnection with other equipment 6 Figure 1 Circuit arrangement for intrinsically safe d.c. power supply 3 Table 1 Outpu
6、t characteristics 2 Table 2 Component specifications 4 Table A.1 Maximum inductance of cables and load for connection to the output of the power supply 6 List of references Inside back coverBS6182-1:1994 ii BSI 08-1999 Foreword This revision of this Part of BS 6182 has been prepared under the direct
7、ion of the Mining Requisites Standards Policy Committee and takes account of experience gained since this standard was first published in1982. It supersedes BS 6182-1:1982, which is withdrawn. In this revision the specification to provide intrinsically safe outputs suitable for use in coal mines has
8、 been developed to allow for alternatives to constant voltage transformers and for alternative power sources to mains. BS 6182 is published in three Parts and specifies a range of d.c. and a.c. power supplies and rechargeable battery units to give a power output ensuring both a minimum acceptable pe
9、rformance with connected apparatus and a maximum power output dictated by the requirements of intrinsic safety. BS 6182-2:1982 specifies requirements for power supplies providing a.c. outputs. Two output voltages are specified for the following purposes: a) a 12 V r.m.s. output to supply intrinsical
10、ly safe apparatus where maximum power availability is the predominant requirement; b) a 15 V r.m.s. output to supply intrinsically safe apparatus where a higher operating voltage is more important than available power. BS 6182-3:1982 specifies requirements for a range of rechargeable battery units t
11、hat are to be charged from the power supplies specified in Parts1 and2. 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 im
12、munity 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 Bye-laws. These place responsibility for complying with specific safe
13、ty requirements on the manufacturer and the user. The address of the recognized certification authorities in the UnitedKingdom for intrinsic safety aspects are: Health and Safety Executive, Mining Equipment Certification Service, Harpur Hill, Buxton, Derbyshire, SK17 9JN. SIRA Certification Service
14、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 6, 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 ind
15、icated in the amendment table on the inside front cover.BS6182-1:1994 BSI 08-1999 1 1 Scope This Part of BS 6182 specifies requirements for the construction and testing of a range of power supply units intended to be certified intrinsically safe for use in coal mines and which provide an intrinsical
16、ly safe d.c. output as follows: a) an 18 DC type power supply provides a nominal18V output that may be used, for example, to float charge an intrinsically safe battery with a nominal discharge end-point voltage of12V; b) a 12 DC type power supply provides a nominal12V output for use where battery st
17、andby is not required, or to float charge an intrinsically safe battery with a nominal discharge end-point voltage of7.5V; c) a 7.5 DC type power supply provides a nominal7.5V output that may be used, for example, with equipment using logic circuits requiring5V for operation. It is intended that the
18、 components forming the power supply circuit be assembled on to a chassis that may be incorporated within either a flameproof enclosure or, where the power supply is located outside a potentially explosive atmosphere, within some other suitable enclosure. Requirements for these enclosures are not gi
19、ven in this standard. Guidance on interconnection with other apparatus is given in Annex A. In addition to the definitive requirements, this standard also requires the information detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the docum
20、ented item has to be satisfied. 2 References 2.1 Normative references This Part of BS 6182 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 the inside bac
21、k cover. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS6182 only when incorporated in it by updating or revision. 2.2 Informative references This Part of BS 6182 refers to other publications that provide information or guidance. Editions of these public
22、ations 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 Definition For the purposes of this Part of BS 6182, the following definition applies. power supply unit An assembly of components forming a power supply c
23、ircuit mounted on a metal chassis. 4 Information and requirements to be agreed and to be documented Information on the a.c. or d.c. electrical supply to the power units to be supplied by the purchaser shall be fully documented (see5.4). Both the definitive requirements specified throughout the stand
24、ard and this documented item shall be satisfied before a claim of compliance with the standard can be made and verified. 5 Design and construction 5.1 General The power supply unit shall conform to BS 5501-7:1977 for GroupI category “ia” apparatus. The power supply unit shall be designed for incorpo
25、ration within one of the following: a) a purpose-designed flameproof enclosure housing only a power supply unit(s); or b) a flameproof enclosure containing other apparatus, in which case the power supply unit shall be fitted with covers to give a degree of protection not less than IP20 as defined in
26、 BSEN60529:1992; or c) a non-flameproof enclosure where the power supply unit is located outside a potentially explosive atmosphere. NOTEIt is intended in each case that power supply units will be separately certified. 5.2 Power supply unit output Each type of power supply unit, i.e. 18 DC, 12 DC an
27、d 7.5 DC, shall conform to the appropriate output values given in columns3, 4, 5 and6 of Table 1. 5.3 Minimum output voltage The output voltage shall not fall below the nominal value shown in column1 of Table 1 at the current stated in column3 under all combinations of input supply and component tol
28、erances.BS6182-1:1994 2 BSI 08-1999 Table 1 Output characteristics 5.4 Input supply voltage Power supply units shall be designed to operate from an a.c. or d.c. source stated by the purchaser on the enquiry and/or order, provided the input circuits are galvanically separated from the output circuits
29、. Mains-fed power supply units shall be designed to operate from single phase a.c. voltages at a specified mains frequency within the range48Hz to62Hz. The tolerance on mains input voltages shall be+10% to 25%. For other types of supply the input voltage tolerances shall be as nominated by the manuf
30、acturer. NOTEThe value of the mains voltage is not specified as a requirement of this standard. The preferred values are120V and/or240V, or 550V and/or 1100V. 5.5 Working temperature When enclosed in the manner of 5.1 a) or 5.1 c), the power supply unit shall be capable of operating continuously whe
31、re the enclosure is subject to an ambient temperature in the range of 5 C to+40 C. NOTEWhen the power supply unit is intended for enclosure in the manner of 5.1 b), the operating temperature range should be agreed between the purchaser and the manufacturer. The preferred range is 5 C to + 70 C. 5.6
32、Power supply circuit 5.6.1 General The power supply circuit shall be as shown in Figure 1. Circuit components shall be mounted on a metal chassis having facilities for making a connection to earth. Any covers required by 5.1 b) shall be fixed in a manner to prevent unauthorized interference and, if
33、made of metal, shall be electrically connected to the metal chassis. 5.6.2 Creepage distances and clearances to earth The device providing galvanic separation, and all components connected to its output side, shall be so mounted that any conducting parts of the circuit, other than the negative line,
34、 shall be infallibly separated from earthed metal parts by the appropriate creepage and clearance distances specified in BS5501-7:1977. 5.6.3 Insulation from earth In addition to the requirements of BS5501-7:1977, the insulation resistance between all parts of the circuit on the output side of the g
35、alvanic separation and earth shall be not less than1 M7 when tested at500V d.c. 5.7 Circuit requirements 5.7.1 General All components shall conform to the relevant requirements specified in BS5501-7:1977, and shall also conform to Table 2 of this Part. 5.7.2 Input connections Effective means shall b
36、e provided to prevent the input connections to any adjustable voltage tappings being easily changed. NOTEFor example, soldered connections are acceptable. The input connections shall be clearly and unambiguously identified so as to avoid incorrect connection. 5.7.3 Reservoir capacitor voltage (C1) 5
37、.7.3.1 With the circuit as in Figure 1, the voltage including ripple across the reservoir capacitor shall not exceed the value given in Table 2 over the range of input voltages specified (see5.4) and an ambient temperature range of 5 C to + 40 C. Type of power supply unit 1 2 3 4 5 6 Nominal output
38、voltage Nominal output current Minimum output current to maintain nominal output voltage (see5.3) Output voltage range at nominal output current level Output voltage range at no load Maximum output voltage under any conditions of service (see note) V mA mA V V V 18 DC 18 140 125 17.48 to 19.04 18.8
39、to 22.4 22.4 12 DC 12 500 466 11.77 to 13.13 12.4 to 14.4 14.4 7.5 DC 7.5 1400 1430 7.64 to 8.6 7.7 to 9 9 NOTEThese values are used when assessing the intrinsic safety of connected apparatus.BS 6182-1:1994 BSI 08-1999 3 NOTESee also Table 2. Figure 1 Circuit arrangement for intrinsically safe d.c.
40、power supplyBS6182-1:1994 4 BSI 08-1999 Table 2 Component specifications 5.7.3.2 With the circuit as in Figure 1, but with the zener diodes disconnected and no load on the output, the voltage including ripple across the reservoir capacitor shall not exceed the value given in Table 2, over the range
41、of input voltages specified (see 5.4) and an ambient temperature range of 5 C to+40 C. NOTEThis value of voltage has been included to account for the possibility of an intermittent fault between the transformer and reservoir capacitor. This is a two countable fault condition as defined in BS5501-7:1
42、977 and as such requires a factor of safety not less than one. 5.7.3.3 With the circuit as in Figure 1, the peak-to-peak ripple voltage at the reservoir capacitor shall not exceed the value specified in Table 2 at any output current between no load and the nominal figure given in column2 of Table 1.
43、 5.7.4 Bridge rectifier The bridge rectifier shall be an encapsulated type. 5.7.5 Current limiting resistor (R1) The current limiting resistor shall be connected in the positive line and shall be of the value given in Table 2. NOTEThe resistance may be made up from more than one resistor provided th
44、at the combination complies with the value given in Table 2. The inductance of the current limiting resistance shall not exceed54H. The resistance shall be capable of dissipating the power given in Table 2 without exceeding the manufacturers maximum rated hotspot temperature when the power supply is
45、 mounted in its enclosure. 5.7.6 Zener diodes (D1, D2, D3) The zener diodes shall be mounted and wired such that if interconnecting wiring becomes disconnected the output will be isolated. Stud-mounted zener diodes shall have the negative line of the power supply connected to their fixing stud. Type
46、 of power supply unit 18 DC 15 DC 7.5 DC Maximum fuse rating FS1 and FS2 A 2 2 2 Constant voltage circuit (for input supply see5.4) Voltage across reservoir capacitor (C1) a) V 24.72 max. (see 5.7.3.1) 16.64 max. (see 5.7.3.1) 14.42 max. (see 5.7.3.1) b) V 29.00 max. (see 5.7.3.2) 18.75 max. (see 5.
47、7.3.2) 17.5 max. (see 5.7.3.2) Peak-to peak ripple voltage across reservoir capacitor (C1) (see5.7.3.3) V 0.16 max. 0.32 max. 0.72 max. Bridge rectifier rating Minimum peak reverse voltage V 75 75 75 Minimum r.m.s. forward current A 1 3 5 Reservoir capacitor (C1) Minimum working voltage V 40 25 25 C
48、urrent limiting resistor (R1) Current limiting resistance (see note 1) 7 (41 1) % (7.1 1) % (4.2 1) % Power rating (seenote2) W 23 60 76 Capacitor discharge resistor (R2) Maximum resistance 7 10500 10500 10500 Zener diode (D1, D2, D3) Voltage (see 5.7.6) V (20 5)% (13 5)% (8.2 5)% Minimum power rati
49、ng (seenote 3) W 5 12 19 NOTE 1These values are calculated under the terms of paragraph2 of clause 9 of BS 5501-7:1977. NOTE 2The values shown include a two-thirds derating factor as required by BS 5501-7:1977 (see also 5.7.5) NOTE 3The values shown include a two-thirds derating factor as required by BS5501-7:1977 (see also 5.7.6). If higher ratings are used in the design then leakage current is an important factor in meeting the requirements of Table 1 and selection of the zener diode may be necessary.BS6182-1:1994 BSI 08-1999 5 T
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