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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7951:2000 ICS 17.220.2
2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Electricity meters Alternating-current single-phase static watt-hour telemeters of accuracy class 1 or 2 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00
3、 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 2000 BSI 05-2000 The following BSI references relate to the work on
4、 this standard: Committee reference PEL/13 Draft for comment 96/210564 DC ISBN 0 580 33159 8 BS 7951:2000 Amendments issued since publication Amd. No.DateComments Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/13,Ele
5、ctricitymeters,uponwhichthefollowingbodieswererepresented: BCEMA BEAMA Metering Association (BMA) Electricity Association Electricity Pool of England and Wales Energy Systems Trade Association Flag Association Institution of Electrical Engineers Office of Electricity Regulation (OFFER) Co-opted memb
6、ers Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7951:2000 BSI 05-2000i Contents Page Committees responsibleInside front cover Forewordii Introduction1 1Scope1 2Normative references1 3Terms and definition
7、s1 4Requirements1 4.1Rated electrical values1 4.2Mechanical requirements2 4.3Ambient conditions3 4.4Electrical requirements3 4.5Electromagnetic compatibility (EMC)4 4.6Accuracy4 4.7Radio teleswitch module4 4.8Other requirements5 5Tests5 5.1General5 5.2Interaction affecting accuracy5 5.3Interaction c
8、ausing emission of spurious pulses5 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 05-2000 BS 7951:2000 Foreword This British Standard has been prepared by Technical Committee PEL/13. As far as possible
9、, the clause numbering of this standard has been structured to correspond with that of BS EN 61036:1997. SI units in accordance with the relevant parts of BS 5775:1993 are used throughout this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users
10、of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 5 and a back cover. The BSI copy
11、right notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 05-20001 BS 7951:2000 Introduction BS 7647 describes a radio-controlled s
12、witch (radio teleswitch) which is used with an electricity meter to provide facilities for implementing a multiple-rate tariff. Technological development now allows the functions of a radio teleswitch to be integrated within a static electricity meter as specified in BS EN 61036. This obviates the n
13、eed for two separate devices. Such an integrated device is known as a (radio) telemeter. A telemeter may incorporate output switches and local communications facilities via an optical port, and is intended for use in those locations in domestic, industrial or commercial premises where it is custom a
14、nd practice to install electricity meters, and tariff and load control devices. The telemeter has energy registers associated with each metrological element for the registration of controlled and/or uncontrolled energy usage. Timing for effect of such registers is provided by an internal clock, sync
15、hronized from time signals decoded by the radio teleswitch module. 1 Scope This British Standard specifies requirements for alternating-current single-phase static watt-hour telemeters of accuracy class 1 or class 2, with one or two measuring elements. It applies to telemeters of protective class I
16、or class II. NOTE Accuracy classes and protective classes are as applied in BS EN 61036:1997. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments
17、 to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 7647:1993, Specification for radio teleswitches for tariff and load control. BS 7856:1996, Code of practice for design of alternating current, watt-hour
18、 meters for active energy (classes 1 and 2). BS EN 55022:1995, Limits and methods of measurement of radio disturbance characteristics of information technology equipment. BS EN 60068-2-6:1996, Environmental testing Test methods Test Fc Vibration (sinusoidal). BS EN 60068-2-27:1993, Environmental tes
19、ting Test methods Environmental testing procedures Tests Test Ea and guidance Shock. BS EN 60529:1992, Degrees of protection provided by enclosures (IP code). BS EN 61036:1997, Alternating current static watt-hour meters for active energy (classes 1 and 2). BS EN 61107:1996, Data exchange for meter
20、reading, tariff and load control Direct local data exchange. 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply, together with relevant definitions given in BS 7647:1993 and BS EN 61036:1997. 3.1 telemeter electricity meter incorporating a ra
21、dio teleswitch module for tariff and load control 3.2 radio teleswitch module part of the telemeter which receives and decodes the radio teleswitch signals and transmits appropriate information to its output circuits 3.3 local communication port infra-red input/output communications facility as spec
22、ified in BS EN 61107:1996 3.4 output switch switch controlled by information from the radio teleswitch module NOTE Output switches include physical switches, with outputs accessible externally, and internal logic switches, which set parameters such as tariff rate within the telemeter. 3.5 load switc
23、h physical output switch for controlling space-heating and/or water-heating equipment 3.6 auxiliary switch physical output switch for signalling changes of rate to external equipment 4 Requirements 4.1 Rated electrical values 4.1.1 Rated voltage (Un) The telemeter shall be rated for a nominal supply
24、 voltage of 230 V. 4.1.2 Rated current Measuring elements shall be rated at 20 A basic (Ib) and 100 A maximum (Imax). NOTE The total current which a two-element telemeter passes will not in practice exceed 120 A, irrespective of the sum of the Imaxrating of each measuring element. This is because th
25、e meter will be controlled by a suppliers fuse rated at up to 100 A, which will operate to break the circuit at about this level, depending on the fusing factor. 4.1.3 Standard frequency The telemeter shall be suitable for a standard supply frequency of 50 Hz. Licensed Copy: London South Bank Univer
26、sity, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 05-2000 BS 7951:2000 4.2 Mechanical requirements 4.2.1 General The telemeter shall conform to BS EN 61036:1997, 4.2.1. 4.2.2 Case The telemeter shall conform to BS EN 61036:1997, 4.2.2. 4.2.3 Win
27、dow If the cover is not transparent, one or more windows shall be provided for reading the display(s) and observation of the operation indicator(s), if fitted; see 4.2.11. The window(s) shall be made of a transparent material, which cannot be removed undamaged without breaking a seal. 4.2.4 Terminal
28、s and terminal block(s) Terminal block(s) shall conform to BS EN 61036:1997, 4.2.4. If the telemeter does not have double insulation, it shall have a protective earth terminal as specified in BS EN 61036:1997, 4.2.4. The dimensions of the telemeter and the spacing of fixing holes and terminals shall
29、 conform to BS 7856:1996, Table 1 and Figure 1. Terminals related to the primary measuring element(s), offering unrestricted supply, shall conform to BS 7856:1996, Figures 2 and 3 in respect of the arrangement of line and neutral. NOTE A telemeter may have terminals additional to those shown in BS 7
30、856:1996. 4.2.5 Terminal covers Terminal covers shall conform to BS EN 61036:1997, 4.2.5. 4.2.6 Clearance and creepage distances Clearance and creepage distances as described in BS EN 61036:1997, 4.2.6, shall conform to the values specified for indoor meters for a voltage phase-to-earth of 300 V in
31、BS EN 61036:1997, Table 3a or Table 3b as appropriate. 4.2.7 Supplementary insulation for insulating encased telemeters of protective class II Insulating encased telemeters of protective class II (see BS EN 61036:1997, 3.4.6) shall conform to BS EN 61036:1997, 4.2.7. 4.2.8 Resistance to heat and fir
32、e The telemeter shall conform to BS EN 61036:1997, 4.2.8. 4.2.9 Protection against penetration by dust and water When tested in accordance with BS EN 61036:1997, 5.2.5, the telemeter shall conform to the degree of protection IP51 as specified in BS EN 60529:1992, but without suction in the meter. 4.
33、2.10 Resistance to impact, shock and vibration 4.2.10.1 After testing in accordance with BS 7647:1993, 10.2.1, the case and terminal cover of the telemeter shall sustain no damage which could affect the function of the telemeter, and it shall not be possible to touch any live part. NOTE Slight damag
34、e which does not impair the protection against indirect contact or the penetration of solid objects, dust and water, is acceptable. 4.2.10.2 After testing in accordance with BS EN 60068-2-27:1993 under the conditions given in BS 7647:1993, 10.2.2, the telemeter shall show no damage and shall operate
35、 correctly, and the position of the switches shall be unchanged. 4.2.10.3 After testing in accordance with BS EN 60068-2-6:1996 under the conditions given in BS 7647:1993, 10.2.3, the telemeter shall show no damage and shall operate correctly, and the position of the switches shall be unchanged; com
36、ponents and wiring shall remain fastened and secure. 4.2.11 Display Display of the values measured by the telemeter shall conform to BS EN 61036:1997, 4.2.11. The display of a two-element telemeter shall indicate the consumption of both elements. NOTE The consumption of the two elements need not be
37、indicated simultaneously. 4.2.12 Output device(s) The telemeter shall have at least one test output device accessible from the front and capable of being monitored by suitable testing equipment. Operation indicator(s), if fitted, shall be visible from the front and shall indicate operation of each m
38、easuring element. If a local communications port is fitted, it shall conform to BS EN 61107:1996. 4.2.13 Output switches 4.2.13.1 General Up to two load switches shall be associated with each measuring element. 4.2.13.2 Indication of switch states The state of each load switch shall be indicated. 4.
39、2.13.3 Number of operations Switches shall conform to BS 7647:1993, 5.8.3, with respect to the number of operations. 4.2.13.4 Non-automatic operation of output switches For test purposes only, there shall be a safe means of setting each output switch to the on or off condition. 4.2.13.5 Acoustic noi
40、se levels Acoustic noise levels of the output switches shall conform to BS 7647:1993, 5.8.5. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:57:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 05-20003 BS 7951:2000 1) Marking BS 7951:2000 on or in relation t
41、o a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party cert
42、ification of conformity. 4.2.14 Marking 4.2.14.1 Nameplate The nameplate of the telemeter shall conform to BS EN 61036:1997, 4.2.13.1, with the addition of the following: 1) the designation Telemeter to BS 7951:20001); 2) the rated breaking currents of the output switches to which external access is
43、 possible; 3) the aerial position, A or B as indicated in BS 7647:1993, Figure 2, where a fixed aerial is fitted. If appropriate, the marking of the number of phases and the number of wires item c) of BS EN 61036:1997, 4.2.13.1 shall be presented in a manner which indicates that the telemeter has tw
44、o elements. The marking shall be indelible, distinct and readable from outside the telemeter. 4.2.14.2 Connection diagrams and terminal marking The telemeter shall be indelibly marked with a diagram of connections. If the terminals of the telemeter carry a marking, the corresponding marking shall ap
45、pear on the diagram. 4.3 Ambient conditions The telemeter shall conform to BS EN 61036:1997, 4.3 for an indoor meter. When tested in accordance with BS EN 61036:1997, 5.3.1 to 5.3.3, the telemeter shall show no damage or change of information and shall operate correctly. 4.4 Electrical requirements
46、NOTE The requirements given in 4.4.2 to 4.4.6 apply to each measuring element of the telemeter 4.4.1 Power consumption The total power consumption of the telemeter, including all measuring elements, electronic circuits and output switches, shall not exceed the values given in Table 1. Table 1 Power
47、consumption Number of elementsPower consumption WVA One310 Two415 The power consumption in each voltage circuit and in each current circuit shall conform to BS EN 61036:1997, 4.4.1, when tested in accordance with BS EN 61036:1997, 5.4.1. 4.4.2 Output switches 4.4.2.1 Rated voltage Output switches sh
48、all be designed for a rated voltage of 230 V. 4.4.2.2 Rated current Each switch shall be able to break under the values of current given in Table 2. Table 2 Switch breaking current Values in amperes Load conditionSwitch breaking current Switch rating 22580 100 Linear ohmic load cos u = 1: current 22
49、580100 Inductive load cos u = 0.4: current 1101010 4.4.3 Effect of supply variations 4.4.3.1 Voltage range A telemeter, including its output switches, shall have a specified operating range for supply voltage from 0.9Unto 1.1Un, where Unis the rated supply voltage (see 4.1). The limit range of operation shall be from 0 to 1.15Un. NOTE The terms specified operating range and limit range of operation are defined in BS EN 61036:1997. 4.4.3.2 Voltage dips and short interruptions When the telemeter is tested in accordance with BS EN 61036:1997, 5.4.2, t
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