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1、BRITISH STANDARD BS 5685-4: 1986 Electricity meters Part 4: Specification for Class 3 var-hour meters UDC 621.317.78 + 681.138.87 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 This British Standard, having been prepared unde
2、r the direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1986 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PEL/14 Draft for comment 84/25634
3、 DC ISBN 0 580 14998 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/14, upon which the following bodies were represented: BEAMA Meter Association Depa
4、rtment of Energy (Electricity Division) Electricity Supply Industry in England and Wales Institution of Electrical Engineers Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
5、 5685-4:1986 BSI 09-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Units1 3Definitions1 4Classification1 5Mechanical requirements1 6Electrical requirements1 7Marking of meters2 8Accuracy2 9Starting and running with no-load2 10Adjustment2 Appendix A Graphical symbols
6、 for var-hour meters3 Table 1 Percentage error limits (single-phase meters and polyphase meters with balanced loads)2 Table 2 Percentage error limits (polyphase meters carrying a single-phase load with balanced polyphase voltages applied to the voltage circuits)2 Table 3 Symbols for var-hour meters3
7、 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 ii BSI 09-1999 Foreword This Part of BS 5685 has been prepared under the direction of the Power Electrical Engineering Standards Commit
8、tee. It supersedes BS 37-9, which is withdrawn. This Part should be read in conjunction with BS 5685-1:19791). The arrangement of format and relationship of subject to clause number is the same as in Part 1. This British Standard is related to IEC 145 but not equivalent in technical content. Other P
9、arts of BS 5685, published at the same time as this Part, are as follows: Part 2: Special requirements for single phase coin-operated prepayment flat rate and two-part tariff watt-hour meters of Class 2 and fixed charge collectors of Class 2; Part 3: Specification for meters having electro-mechanica
10、l maximum demand indicators of Class 1. Further Parts dealing with other types of meter and meter accessories are in preparation. 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. Compl
11、iance 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 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may hav
12、e had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) BS 5685:1979 has been renumbered BS 5685-1 by amendment. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 BSI 09-19991 1
13、 Scope This Part of BS 5685 specifies the mechanical and electrical requirements and type tests for single-phase and polyphase, single rate and multi-rate, var-hour (reactive volt-ampere-hour) meters of accuracy Class 3, for the measurement of alternating current electrical reactive energy of a freq
14、uency in the range 45 Hz to 65 Hz and having a voltage across connection terminals not exceeding 600 V (line-to-line for meters for polyphase systems). This Part of BS 5685 is not applicable to measuring devices such as those used for telemetering electrical energy, which are dealt with in other Bri
15、tish Standards, nor to maximum demand indicators, nor to meters for testing purposes, nor to special types of vat-hour meters such as excess meters (although it is applicable to multi-rate meters). NOTEThe titles of the publications referred to in this Part of BS 5685 are listed on the inside back c
16、over. 2 Units The units employed in this standard are in accordance with BS 5775-5. 3 Definitions For the purposes of this Part of BS 5685 the definitions given in 3.2 to 3.38 of BS 5685-1:1979 apply together with the following. NOTEFor convenience of reference the numbering of definitions in this c
17、lause and Part 1 is consecutive. For further definitions relating to measurement see BS 4727-1:Group 04. 3.39 class index 3.39.1 accuracy class index a number corresponding to the numerical value of the limits of percentage error of a meter under the reference conditions specified in this Part of BS
18、 5685 NOTESee clause 8. 3.39.2 phase displacement class index a number corresponding to the numerical value of the nominal phase displacement angle in degrees between the voltage and current magnetic fluxes in the principal air gaps when the voltage and current applied to a single driving element ar
19、e in phase 3.40 var-hour meter (reactive volt-ampere-hour meter) an integrating instrument which measures var-hours (reactive volt-ampere-hours) or decimal multiples thereof 4 Classification 4.1 Accuracy class Meters covered by this Part of BS 5685, the error limits for which are specified in clause
20、 8, shall be classified according to accuracy class index as Class 3. 4.2 Phase displacement class Meters covered by this Part of BS 5685 shall be classified according to phase displacement class index in Classes 0, 60 or 90. 5 Mechanical requirements The meter shall comply with the requirements giv
21、en in 5.1 to 5.8 of BS 5685-1:1979 except that in 5.7 the units kilovar hour (kvar h) and megavar hour (Mvar h) shall apply instead of kilowatt hour and megawatt hour respectively, and the unit kilovar (kvar) shall apply instead of kilowatt. 6 Electrical requirements 6.1 Standard currents The standa
22、rd and maximum currents for var-hour meters shall comply with Table 2 of BS 5685-1:1979. 6.2 Standard reference voltages The standard reference voltages for var-hour meters shall comply with Table 3 of BS 5685-1:1979. 6.3 Power losses 6.3.1 Voltage circuits. The loss in each voltage circuit of the m
23、eter at reference voltage, reference temperature and reference frequency shall not exceed 5 W and 10 VA. 6.3.2 Current circuits. The apparent power taken by each circuit of a direct connected meter at basic current, reference frequency and reference temperature shall not exceed 5 VA. In a transforme
24、r-operated meter this value shall not be exceeded at a current value that equals the rated secondary current of a transformer to which the meter is to be connected. 6.3.3 Auxiliary circuits. Auxiliary circuits shall comply with 6.3.3 of BS 5685-1:1979. 6.4 Heating The meter shall comply with 6.4 of
25、BS 5685-1:1979. 6.5 Dielectric properties The meter shall comply with 6.5, 6.5.1, 6.5.2 and 6.5.3 of BS 5685-1:1979. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 2 BSI 09-1999 7 Marking of meters Each meter shall bear a nam
26、eplate marked with the information listed in 7.1 of BS 5685-1:1979 except that the constant of the meter item h) shall be in the form x var h/r or x r/(kvarh) and the class index of the meter item i) shall be in the form of the number g in a circle or as “CI.3”. In addition to the marking required b
27、y Part 1 the nameplate shall bear the phase displacement class index, either in the form of the number 0, 60 or 90 as appropriate, or in the form of a symbol as shown in Appendix A of this Part of BS 5685. 8 Accuracy 8.1 Test conditions Tests shall be carried out in accordance with the conditions of
28、 8.1 of BS 5685-1:1979 for Class 2 watt-hour meters except that the term “sin ” shall be applicable whenever reference is made to “power factor”, where is the phase angle between the supply voltage and the corresponding current, or the average of the phase angles on a polyphase system. 8.2 Limits of
29、 error When the meter is under the reference conditions given in 8.1 of BS 5685-1:1979, the percentage errors shall not exceed the limits given in Table 1 and Table 2 of this Part of BS 5685. The difference between the percentage error when the meter is carrying a single-phase load at basic current
30、and sin = 1 and the percentage error when the meter is carrying a balanced polyphase load at basic current and sin = 1 shall not exceed 2.5 %. When the meter is tested for compliance with the limits given in Table 2, the test current shall be supplied to each element in sequence. Table 1 Percentage
31、error limits (single-phase meters and polyphase meters with balanced loads) 8.3 Test of meter constant The requirements of 8.3 of BS 5685-1:1979 shall apply. Table 2 Percentage error limits (polyphase meters carrying a single-phase load with balanced polyphase voltages applied to the voltage circuit
32、s) 8.4 Interpretation of test results NOTECertain test results may fall outside the limits given in Table 1 and Table 2 of this Part of BS 5685 owing to uncertainties of measurement and other parameters capable of influencing the measurements. If by one displacement of the zero line parallel to itse
33、lf by no more than 1 % all the test results are brought within the limits given in Table 1 and Table 2, the meter type shall be deemed to comply with this Part of BS 5685. 8.5 Effect of influence quantities The requirements of 8.5, 8.5.1 and 8.5.2 of BS 5685-1:1979 for Class 2 watt-hour meters shall
34、 apply, except that “sin ” shall be applicable instead of “power factor”, and that limits of variation in percentage error for a 5 % variation in frequency at 0.5Imax, sin = 0.5 shall be 2.5 %. 8.6 Short-time overcurrents The requirements of 8.6, 8.6.1 and 8.6.2 of BS 5685-1:1979 for Class 2 watt-ho
35、ur meters shall apply, except that “sin ” shall be applicable instead of “power factor”. 8.7 Influence of self-heating The requirements of 8.7 of BS 5685-1:1979 for Class 2 watt-hour meters shall apply except that “sin ” shall be applicable instead of “power factor”. 9 Starting and running with no-l
36、oad The requirements of clause 9, 9.1 and 9.2 of BS 5685-1:1979 for Class 2 watt-hour meters shall apply except that “sin ” shall be applicable instead of “power factor”. 10 Adjustment The requirements of clause 10 of BS 5685-1:1979 for Class 2 watt-hour meters shall apply except that “sin ” shall b
37、e applicable instead of ”power factor”. CurrentSin Limit of error A% From 0.1Ib to 0.2Ib1 4.0 Over 0.2Ib to Imax1 3.0 From 0.2Ib to Imax0.5 lagging 0.8 leading 3.0 3.0 Current Sin of the relevant element Limit of error A% From 0.2Ib to Imax1 4.0 From 0.5Ib to Imax0.5 lagging 0.8 leading 4.0 4.0 Lice
38、nsed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 BSI 09-19993 Appendix A Graphical symbols for var-hour meters In the symbols shown in Table 3 each voltage circuit is represented by a line and each current circuit by a dot or a sma
39、ll circle. The dot at the end of each line representing a voltage circuit represents a current circuit arranged to have a point of common connection with that voltage circuit. If a current circuit and a voltage circuit having such a common point of connection are not part of the same electro-magnet,
40、 the dot representing the current circuit is joined to the mid-point of the line representing the voltage circuit by a guide-line not more than half the width of the line representing the voltage circuit. If an electro-magnet carries two current circuits then the diameters of the representative dots
41、 are in the same ratio as the ratio of the respective number of turns in each circuit. The angle between two lines of a symbol represents the phase angle between the corresponding voltages provided the positive direction is accepted as that going towards the common point in two line symbols (e.g. sy
42、mbols (i) and (j) in Table 3), and in the trigonometrical direction in the case of triangular symbols (e.g. symbol (b) in Table 3). In order to distinguish the direction of the voltage acting on each current, a current influenced by a positive direction of voltage is indicated by a dot, and a curren
43、t influenced by a negative direction of voltage is indicated by a circle. Table 3 Symbols for var-hour meters SymbolExplanation Phase displacement Class 0 (a)Indicates that the meter has one current winding and one voltage winding (for one-phase, two-wire circuits). (b)Indicates that the meter has o
44、ne voltage winding and two current windings (for one-phase, two- or three-wire circuits when the voltage winding is connected across the outers). (c)Indicates that the meter has two elements, each with a voltage winding and a current winding. The current windings are connected in the outers of a one
45、-phase, three-wire circuit. The corresponding voltage windings are connected between the outers and the mid-wire. (d)Indicates that the meter has two elements, each with a voltage winding and a current winding. The current windings are inserted in a phase conductor of a three-phase circuit. The volt
46、age winding of each element is connected between the neutral and the phase conductor in which its current winding is inserted. (e)Indicates that the meter has two elements, each having a voltage winding and a current winding, and connected for the “two-wattmeter” method (for three- phase, three-wire
47、 circuits). (f)Indicates that the meter has three elements, each having a voltage winding and a current winding, and connected for the “three-wattmeter” method (for three-phase, four-wire circuits). (g)Indicates that the meter has two elements, each having a voltage winding and a current winding. Th
48、e current windings are connected in the two-phase conductors of a two-phase, three-wire circuit. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:21:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5685-4:1986 4 BSI 09-1999 Table 3 Symbols for var-hour meters SymbolExplanation Three-phase m
49、eters, phase displacement Class 90 (h)Indicates that the meter has three electro-magnets with a voltage circuit and a current circuit, each of which is arranged to have a common point with the voltage circuits of the two other electro-magnets. The voltage circuit of each electro-magnet is fed by the voltage between the phase conductors which do not contain its current circuit. The symbol is applicable to three-phase, three- or four-wire circuits, e.g. (i)Indicates that the meter has two electro-magnets each having a volt