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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 622.33.005:621.3.031:621.311.4.024 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 This
2、 British Standard, 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 March 1994 BSI 08-1999 First published September 1982 Second edition March 1994 The following BSI refe
3、rences relate to the work on this standard: Committee reference MRE/25 Draft for comment 90/77414 DC ISBN 0 580 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 Com
4、mittee MRE/25, upon which the following bodies were represented: Association of British Mining Equipment Companies British Coal Corporation Council for Electrical Equipment for Flammable Atmospheres (BEAMA) Health and Safety Executive Amendments issued since publication Amd. No.DateComments Licensed
5、 Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 BSI 08-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Definition1 4Information and requirements to be agreed and to be documented1 5Design
6、and construction1 6Marking5 7Routine tests5 Annex A (informative) Guidance on interconnection with other equipment6 Figure 1 Circuit arrangement for intrinsically safe d.c. power supply3 Table 1 Output characteristics2 Table 2 Component specifications4 Table A.1 Maximum inductance of cables and load
7、 for connection to the output of the power supply6 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 ii BSI 08-1999 Foreword This revision of this Part of BS 6182 has been prepared under the d
8、irection of the Mining Requisites Standards Policy Committee and takes account of experience gained since this standard was first published in 1982. It supersedes BS 6182-1:1982, which is withdrawn. In this revision the specification to provide intrinsically safe outputs suitable for use in coal min
9、es has 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 accepta
10、ble performance 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 intri
11、nsically 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 u
12、nits that are to be charged from the power supplies specified in Parts 1 and 2. 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 c
13、onfer immunity 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 speci
14、fic safety requirements on the manufacturer and the user. The address of the recognized certification authorities in the United Kingdom for intrinsic safety aspects are: Health and Safety Executive, Mining Equipment Certification Service, Harpur Hill, Buxton, Derbyshire, SK17 9JN. SIRA Certification
15、 Service Saighton 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 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w
16、ill be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 BSI 08-19991 1 Scope This Part of BS 6182 specifies requirements for the construction and testing of a range of
17、 power supply units intended to be certified intrinsically safe for use in coal mines and which provide an intrinsically safe d.c. output as follows: a) an 18 DC type power supply provides a nominal 18 V output that may be used, for example, to float charge an intrinsically safe battery with a nomin
18、al discharge end-point voltage of 12 V; b) a 12 DC type power supply provides a nominal 12 V output for use where battery standby is not required, or to float charge an intrinsically safe battery with a nominal discharge end-point voltage of 7.5 V; c) a 7.5 DC type power supply provides a nominal 7.
19、5 V output that may be used, for example, with equipment using logic circuits requiring 5 V for operation. It is intended that the 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 loca
20、ted outside a potentially explosive atmosphere, within some other suitable enclosure. Requirements for these enclosures are not given 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 in
21、formation detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented 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 publicat
22、ions. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this Part of BS 6182 only when incorporated in it by updating or revision. 2.2 Info
23、rmative references This Part of BS 6182 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 Definition For the purpo
24、ses of this Part of BS 6182, the following definition applies. power supply unit An assembly of components forming a power supply circuit 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
25、to be supplied by the purchaser shall be fully documented (see 5.4). Both the definitive requirements specified throughout the standard 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
26、 supply unit shall conform to BS 5501-7:1977 for Group I category “ia” apparatus. The power supply unit shall be designed for incorporation 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 appar
27、atus, 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 BS EN 60529:1992; or c) a non-flameproof enclosure where the power supply unit is located outside a potentially explosive atmosphere. NOTEIt is intended in each case
28、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 and 7.5 DC, shall conform to the appropriate output values given in columns 3, 4, 5 and 6 of Table 1. 5.3 Minimum output voltage The output voltage shall not fall belo
29、w the nominal value shown in column 1 of Table 1 at the current stated in column 3 under all combinations of input supply and component tolerances. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 2 BSI 08-1999 Table 1 Output c
30、haracteristics 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. Mains-fed power supply units shall be designed to
31、operate from single phase a.c. voltages at a specified mains frequency within the range 48 Hz to 62 Hz. 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 manufacturer. NOTEThe value of the mains voltage
32、is not specified as a requirement of this standard. The preferred values are 120 V and/or 240 V, or 550 V and/or 1 100 V. 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 where the enclosure is subject to an amb
33、ient 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 Power supply circuit 5.6.1 General
34、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 made of metal, shall be electricall
35、y 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, shall be infallibly separated from
36、 earthed metal parts by the appropriate creepage and clearance distances specified in BS 5501-7:1977. 5.6.3 Insulation from earth In addition to the requirements of BS 5501-7:1977, the insulation resistance between all parts of the circuit on the output side of the galvanic separation and earth shal
37、l be not less than 1 M7 when tested at 500 V d.c. 5.7 Circuit requirements 5.7.1 General All components shall conform to the relevant requirements specified in BS 5501-7:1977, and shall also conform to Table 2 of this Part. 5.7.2 Input connections Effective means shall be provided to prevent the inp
38、ut 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) 5.7.3.1 With the circuit as in
39、 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 (see 5.4) and an ambient temperature range of 5 C to + 40 C. Type of power supply unit 123456 Nominal output voltage Nominal output current Mi
40、nimum output current to maintain nominal output voltage (see 5.3) Output voltage range at nominal output current level Output voltage range at no load Maximum output voltage under any conditions of service (see note) VmAmAVVV 18 DC1814012517.48 to 19.0418.8 to 22.422.4 12 DC1250046611.77 to 13.1312.
41、4 to 14.414.4 7.5 DC7.51 4001 4307.64 to 8.67.7 to 99 NOTEThese values are used when assessing the intrinsic safety of connected apparatus. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 BSI 08-19993 NOTESee also Table 2. Fig
42、ure 1 Circuit arrangement for intrinsically safe d.c. power supply Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 07:41:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6182-1:1994 4 BSI 08-1999 Table 2 Component specifications 5.7.3.2 With the circuit as in Figure 1, but with the zener diod
43、es 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 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 a
44、ccount for the possibility of an intermittent fault between the transformer and reservoir capacitor. This is a two countable fault condition as defined in BS 5501-7:1977 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 voltag
45、e 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 column 2 of Table 1. 5.7.4 Bridge rectifier The bridge rectifier shall be an encapsulated type. 5.7.5 Current limiting resistor (R1) The current limiting
46、 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 that the combination complies with the value given in Table 2. The inductance of the current limiting resistance shall not exceed 5 4H.
47、 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 mounted in its enclosure. 5.7.6 Zener diodes (D1, D2, D3) The zener diodes shall be mounted and wired such that if interconnecting
48、 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 of power supply unit 18 DC15 DC7.5 DC Maximum fuse rating FS1 and FS2A222 Constant voltage circuit (for input supply see 5.4) Volt
49、age across reservoir capacitor (C1) a)V24.72 max. (see 5.7.3.1) 16.64 max. (see 5.7.3.1) 14.42 max. (see 5.7.3.1) b)V29.00 max. (see 5.7.3.2) 18.75 max. (see 5.7.3.2) 17.5 max. (see 5.7.3.2) Peak-to peak ripple voltage across reservoir capacitor (C1) (see 5.7.3.3) V0.16 max.0.32 max.0.72 max. Bridge rectifier ratingMinimum peak reverse voltage V757575 Minimum r.m.s. forward current A135 Reservoir capacitor (C1) Minimum working voltageV402525 Current limiting resistor (R1) Current limiting resistance (see note 1) 7(41 1) %(7.1 1) %(4.2