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1、BRITISH STANDARD BS 5685-1: 1979 Incorporating Amendment Nos. 1 and 2 Electricity meters Part 1: Specification for Class 0.5, 1 and 2 single-phase and polyphase, single rate and multi-rate watt-hour meters UDC 621.317.78:681.138.87 BS 5685-1:1979 This British Standard, having been prepared under the
2、 direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 March 1979 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PEL/14 Draft for comment 77/29500 DC I
3、SBN 0 580 10615 2 Cooperating organizations The Power Electrical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical
4、Committee Association of Short Circuit Testing Authorities British Electrical and Allied Manufacturers Association (BEAMA) British Railways Board British Steel Corporation Department of Energy (Electricity)* Electrical Contractors Association Electrical Contractors Association of Scotland Electrical
5、 Research Association Electricity Supply Industry in England and Wales* Engineering Equipment Users Association Institute of Purchasing and Supply Institution of Electrical Engineers* Ministry of Defence National Coal Board National Economic Development Office Trades Union Congress The organizations
6、 marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: BEAMA Meter Association Electrical Power Engineers Association Amendments issued since publication Amd. No.Date of issueComment
7、s 3061August 1979 4792May 1985Indicated by a sideline in the margin BS 5685-1:1979 BSI 09-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope and references1 2Units1 3Definitions1 4Classification5 5Mechanical requirements5 6Electrical requirements8 7Marking of meters11
8、8Accuracy13 9Starting and running with no-load17 10Adjustment17 Appendix A Graphical symbols for watt-hour meters20 Appendix B Flammability test20 Figure 1 Spacing of fixing holes and terminals for single-phase, two wire meters21 Figure 2 Diagram of connections for a single-phase, two wire, single r
9、ate meter22 Figure 3 Diagram of connections for a single-phase, two wire, two rate meter22 Figure 4 Connections for a two element meter used on three wire systems23 Figure 5 Connections for a two element meter used on a two-phase, four wire system24 Figure 6 Connections for a three element meter use
10、d on a three-phase, four wire system25 Figure 7 Arrangement for flammability test26 Table 1 Clearances and creepage distances6 Table 2 Standard basic currents8 Table 3 Standard reference voltages8 Table 4 Power loss9 Table 5 Apparent power loss9 Table 6 Heating9 Table 7 A.C. voltage tests12 Table 8
11、Voltage marking13 Table 9 Voltage and current balance13 Table 10 Reference conditions14 Table 11 Percentage error limits14 Table 12 Percentage error limits15 Table 13 Interpretation of test results15 Table 14 Temperature coefficient15 Table 15 Influence quantities16 Table 16 Variations due to short-
12、time overcurrents17 Table 17 Variations due to self-heating17 Table 18 Starting currents17 Table 19 Minimum range of adjustment18 Table 20 Dimensions and spacing of fixing holes and terminals18 Table 21 Graduation of circular scales or number drums19 Publications referred toInside back cover BS 5685
13、-1:1979 ii BSI 09-1999 Foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Committee. It closely follows IEC Publication 521 “Class 0.5, 1 and 2 alternating-current watt-hour meters”, although it has been necessary to put in additional c
14、lauses and consequent modifications to cater for British requirements already standardized. Significant technical additions and deviations are indicated by vertical lines in the margin. This standard is harmonized with HD 309.1 of the European Committee for Electrotechnical Standardization with rega
15、rd to Class 2 meters. BS 5685, in four Parts, will supersede all the various Parts of BS 37. BS 37-6, BS 37-8 and BS 37-10 were withdrawn in December 1983 without replacement. This Part of BS 5685 supersedes BS 37-2, BS 37-4, BS 37-7, BS 37-11 and BS 37-12, which have been withdrawn. BS 5685-2 will
16、supersede BS 37-3; BS 5685-3 will supersede BS 37-5 and BS 5685-4 will supersede BS 37-9. On completion of the four Parts of BS 5685, BS 37-1 will be withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for t
17、heir 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 26, an inside back cover and a back cover. This standard has been updated
18、(see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 5685-1:1979 BSI 09-19991 1 Scope and references 1.1 Scope. This standard specifies the mechanical and electrical requirements and type tests, for single-phase an
19、d polyphase, single rate and multi-rate, induction type watt-hour meters of accuracy Classes 0.5, 1 and 2, for the measurement of alternating current electrical active energy of a frequency in the range of 45 Hz to 65 Hz, and having a voltage across the connection terminals not exceeding 600 V (line
20、-to-line for meters for polyphase systems). The standard does not apply to measuring devices, such as those used for telemetering electrical energy, which are dealt with in other standards, nor to maximum demand indicators. The standard does not apply to meters for testing purposes, nor to special t
21、ypes of watt-hour meters such as excess meters (although it does apply to multi-rate meters). 1.2 References. The titles of the publications referred to in this standard are listed on the inside back cover. 2 Units The units employed in this standard are in accordance with BS 5775-5. 3 Definitions F
22、or the purposes of this British Standard the following definitions apply. For further definitions relating to measurement see BS 4727-1:Group 04. 3.1 watt-hour meter (active-energy meter) an integrating instrument which measures active energy in watt hours or in decimal multiples thereof 3.2 inducti
23、on meter a meter in which currents in fixed coils react with the currents induced in the conducting moving element, generally a disc or discs, which causes its movement 3.3 multi-rate meter a meter provided with a register consisting of more than one set of drums or dials, each set becoming operativ
24、e at times corresponding to different tariff rates 3.4 meter rotor the moving element of the meter upon which the magnetic fluxes of fixed windings and of braking elements act, and which operates the register 3.5 meter driving element a working part of the meter which produces a torque by the action
25、 of its magnetic fluxes upon the currents induced in the moving element. It generally comprises electromagnets with their control devices 3.6 meter braking element the part of the meter which produces a braking torque by the action of its magnetic flux upon the currents induced in the moving element
26、. It comprises one or more magnets and their adjusting devices 3.7 register of a meter (counting mechanism of a meter) the part of the meter which registers the energy, or more generally the value of the quantity measured by the meter BS 5685-1:1979 2 BSI 09-1999 3.8 meter base The back of the meter
27、 by which it is generally fixed and to which are attached the frame, the terminals or the terminal block and the cover; for a flush-mounted meter, it may include the sides of the case. 3.8.1 meter socket an enclosure with jaws to accommodate terminals of a detachable watt-hour meter and which has co
28、nnectors from the termination of the circuit conductors. It may be a single-position socket for one meter or a multiple-position socket for two or more meters 3.9 meter cover the enclosure on the front of the meter, made either wholly of transparent material or opaque material provided with window(s
29、) through which the movement of the rotor can be seen and the register can be read 3.10 meter case this comprises the base and the cover 3.11 meter frame the part to which are affixed the driving elements, the rotor bearings, the register, usually the braking element, and sometimes the adjusting dev
30、ices 3.12 accessible conducting part a conducting part which can be touched by the standard test finger1), when the meter is installed ready for use 3.13 protective earth terminal the terminal connected to accessible conducting parts of a meter, for safety purposes 3.14 terminal block a support made
31、 of insulating material on which all or some of the terminals of the meter are grouped together 3.15 terminal cover a cover which covers the meter terminals and, generally, the ends of the external wires or cables connected to the terminals 3.16 current circuit the winding of the driving element and
32、 the internal connections of the meter through which flows the current of the circuit to which the meter is connected NOTEWhen the meter incorporates a current transformer, the current circuit also includes the transformer windings. 3.17 voltage circuit the winding of the driving element and interna
33、l connections of the meter, supplied with the voltage of the circuit to which the meter is connected 1) See 6.1.1 of BS 5458:1977. BS 5685-1:1979 BSI 09-19993 3.18 auxiliary circuit the elements (windings, lamps, contacts, etc.) and connections of an auxiliary device within the meter case intended t
34、o be connected to an external device, i.e. clock, relay, or impulse counter 3.19 basic current2) (Ib) the value of current in accordance with which the relevant performance of the meter is fixed 3.20 rated maximum current2) (Imax) the highest value of current at which the meter purports to meet the
35、accuracy requirements of this standard 3.21 reference voltage2) the value of voltage in accordance with which the relevant performance of the meter is fixed 3.22 reference frequency the value of frequency in accordance with which the relevant performance of the meter is fixed 3.23 basic speed the no
36、minal speed of rotation of the rotor expressed in revolutions per minute when the meter is under reference conditions and carries basic current at unity power factor 3.24 basic torque the nominal value of the torque on the rotor when at rest, when the meter is under reference conditions and carries
37、basic current at unity power factor 3.25 meter constant a constant expressing the relation between the energy registered by the meter and the corresponding number of revolutions of the rotor, either in revolutions per kilowatt hour or watt hours per revolution 3.26 reference temperature the ambient
38、temperature specified for reference conditions 3.27 clearance the shortest distance measured in air between conductive parts 3.28 creepage distance the shortest distance measured over the surface of insulation between conductive parts 3.29 type the designation used for defining a particular design o
39、f meter, manufactured by one manufacturer, having: a) similar metrological properties, b) the same uniform construction of parts determining these properties, 2) The terms voltage and current indicate r.m.s. values unless otherwise specified. BS 5685-1:1979 4 BSI 09-1999 c) the same number of ampere
40、 turns for the current winding at basic current and the same number of turns per volt for the voltage winding at reference voltage, d) the same ratio of the maximum current to the basic current. they may have several values of basic current and several values of reference voltage these meters are de
41、signated by the manufacturer by one or more groups of letters or numbers, or of a combination of letters and numbers. Each type has one designation only NOTE 1The type is represented by the sample meter(s) intended for the type tests, and whose characteristics (basic currents and reference voltages)
42、 are chosen from the values given in the tables proposed by the manufacturer. NOTE 2Where the number of ampere turns would lead to a number of turns other than a whole number, the product of the number of turns of the windings and the value of the basic current may differ from that of the sample met
43、er(s) representative of the type. It is advisable to choose the next number immediately above or below in order to have whole numbers of turns. Only for this reason may the number of turns per volt of the voltage windings differ, but by not more than 20 %, from that of the sample meters representati
44、ve of the type. NOTE 3The ratio of the highest to the lowest basic speed of the rotors of each of the meters of the same type should not exceed 1.5. 3.30 type test a test carried out under prescribed conditions to verify one of the characteristics of the type of the meter 3.31 type approval procedur
45、e the procedure according to which the series of type tests is carried out on one meter or on a small number of meters of the same type having identical characteristics, selected by the manufacturer, to verify that the respective type of meter complies with all the requirements of the standard for t
46、he relevant class of meters 3.32 qualification procedure the procedure according to which type tests are carried out on one meter or on a small number of meters of the same type having identical characteristics, selected at random, to verify that the meter type has no serious systematic abnormalitie
47、s. The precise tests and the number of meters to be tested are to be agreed between the parties NOTEIn practice, it is considered that no serious systematic abnormalities exist when two out of three meters tested comply with the relevant requirements of this standard for the test under consideration
48、. 3.33 percentage error the percentage error is given by the following formula: NOTESince the true value cannot be determined, it is approximated by a value with a stated uncertainty that can be traced to standards agreed upon between manufacturer and user or to national standards. 3.34 variation of
49、 error due to an influence quantity the difference between the percentage errors of the meter when only one influence quantity assumes successively two specified values 3.35 influence quantity or factor any quantity or any factor other than the measured quantity whose effects may modify the measured results 3.36 distortion factor the ratio of the r.m.s. value of the harmonic content (obtained by subtracting from a non-sinusoidal alternating quantity its fundamental term) to the r.m.s. value of the non-sinusoidal quant