1、BRITISH STANDARD BS 3101:1986 Specification for Control and interlock circuits primarily associated with flameproof restrained plugs and sockets for use in coal mines UDC 681.5:621.316.541-213.34:622.822.3BS3101:1986 This British Standard, having been prepared under the directionof the Mining and Qu
2、arrying Requisites StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffect on 31 December1986 BSI 08-1999 First published March 1959 First revision December 1986 The following BSI references relate to the work on this standard: Committee reference MQE/16 Draft f
3、or comment 85/74238 DC ISBN 0 580 15411 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Mining and Quarrying Requisites Standards Committee (MQE/-) to Technical Committee MQE/16, upon which the following bodies were represented: Associ
4、ation of British Mining Equipment Companies British Coal Health and Safety Executive Institution of Mining Electrical and Mining Mechanical Engineers National Union of Mineworkers Amendments issued since publication Amd. No. Date of issue CommentsBS3101:1986 BSI 08-1999 i Contents Page Committees re
5、sponsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Control circuit requirements 1 4 Control circuit connections 2 5 Component requirements 3 6 Control circuit requirements when a resistor proving system is provided 3 7 Interlock circuit requirements 3 Appendix A Associated controll
6、ed devices and systems 5 Appendix B Conditions under which the control and interlock circuitcanbeconsidered as intrinsically safe 5 Figure 1 Connections for remote control 2 Figure 2 Connections for local control 2 Figure 3 Connections for interlock circuits 4 Publication referred to Inside back cov
7、erBS3101:1986 ii BSI 08-1999 Foreword This revision of BS3101 has been prepared under the direction of the Mining and Quarrying Requisites Standards Committee and supersedes BS3101:1959, which is withdrawn. It continues to aid manufacturers in establishing standard characteristics and operating cond
8、itions for control circuits for use primarily in coal mines; it does this by specifying requirements for circuits and associated apparatus which are necessary to ensure that the components of the control units away from the supply and control unit (gate-end box) can be used with any such unit that h
9、as a circuit complying with this standard. This revision provides for local or remote control and now includes requirements for optional interlock circuits and resistor proving systems which will enhance the operational safety of the control circuit. This standard refers only to BS1259, since at the
10、 date of publication no comparable British Standard or European standard exists relative to control and interlock circuits. Attention is drawn to Appendix A, which recommends operational requirements for equipment using a control circuit complying with this standard. Attention is drawn to the Health
11、 2) 0.65V at125 C. d) The limits of forward voltage drop, specified inc) of this subclause, shall not be exceeded during the service life. NOTEThe service life will need to be the subject of agreement between the supplier and purchaser. e) At the ratings specified in a) and b) of this subclause, the
12、 rectifier shall be capable of continuous operation at any temperature between0 C and80 C and a relative humidity of up to100%, when enclosed in a robust, unventilated case. 6 Control circuit requirements when a resistor proving system is provided 6.1 General When a resistor proving system is provid
13、ed, the control circuit shall only operate when the control apparatus is connected in the correct sequence of OFFSTARTRUN. NOTE 1It is accepted that under certain conditions, e.g.restoration of power or operation of series connected contacts, it may only be necessary to move the switching device fro
14、m RUN to START and back to RUN to restore control circuit operation. NOTE 2For convenience the terms START and RUN will continue to be used. However, it is implicit with the resistor proving system that the START position does not complete the control circuit, but is used to prepare the circuit for
15、operation when the switching device is moved to the RUN position. The resistor proving system shall either be fail-safe, or means shall be provided to ensure that it has correctly detected the reduced resistance when the switching device is in the START position. The requirements of6.2 and6.3 shall
16、apply equally to remote and local control. 6.2 Circuit resistance The resistor proving system shall prevent operation of the control circuit if, at normal voltage, the lead and return resistance of the external cable and earth circuit is less than237. For all values of voltage between75% and120% of
17、the declared supply voltage, the value of resistance at which the remote control circuit ceases to operate shall not be less than107 below the minimum value of resistance at which the resistor proving system operates. 6.3 Timing The control circuit shall only operate if the resistor proving system d
18、etects that the switching device has returned to the RUN position in not more than5s after moving to the START position. 7 Interlock circuit requirements 7.1 General When provided, the interlock circuit (see Figure 3) is used for proving that remote apparatus is connected by cable and shall not be u
19、sed directly for starting purposes. The essential remote apparatus shall be a half-wave rectifier complying with5.2 and connected at the remote end of the circuit. 7.2 Intrinsic safety The interlock circuit shall be intrinsically safe in accordance with BS1259. NOTEAppendix B defines the conditions
20、under which the circuit can be considered as intrinsically safe. 7.3 Voltage limits for operation The interlock circuit shall operate at voltages down to75% of the rated input voltage 2)and shall continue to operate at voltages down to60% of the rated input voltage of the apparatus with which this c
21、ircuit is used, and under no condition shall it continue to operate at20% or less of the rated input voltage. 7.4 Operation under interlock circuit to earth fault conditions The interlock circuit shall not operate if the fault resistance is407 or less, and shall cease to operate if the fault resista
22、nce is157 or less. 2) It is permissible for input tappings to the primary of the control circuit transformer to be used, so that, when the corresponding rated input voltage is applied, the circuit control voltage has nominally the same value.BS3101:1986 4 BSI 08-1999 Irrespective of the magnitude of
23、 the fault, when the remote apparatus is in an open circuit condition, the interlock circuit shall not operate with the input voltage at any value up to and including120% of the rated input voltage of the apparatus with which this circuit is used. NOTEIn practice detection of the fault resistance wi
24、ll be at higher values than the stated limits. 7.5 Maximum current The maximum current, when an impedance of1.07 is connected between the terminal of the interlock circuit and earth, shall not exceed0.25A (r.m.s.) for voltages in the range0% to120% of the rated input voltage of the apparatus with wh
25、ich this circuit is used. 7.6 Inclination to normal direction The interlock circuit shall comply with all the requirements of this standard, with the components inclined in any direction at an angle of15 to their normal position. 7.7 Cable resistance All the requirements of clause7 shall be satisfie
26、d with any external cable having a lead and return resistance in the range07 to57. 7.8 Circuit resistance The interlock circuit shall not operate at the rated input voltage if the lead and return resistance of the external circuit is237 or greater. It shall cease to operate with as low a value of external resistance (excluding circuit components) as can be tolerated for stability, but this resistance shall not exceed707. Figure 3 Connections for interlock circuits
