BS EN 61000-3-11-2001 电磁兼容性.极限值.公共低压供电系统电压变化、电压波动和闪烁极限值.额定电流为75A有规定连接条件的设备.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 61000-3-11:2001 IEC 61000-3-11:2000 Incorporating Corrigendum No.1 ICS 33.100.10; 91.140.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Electromagnetic compatibility (EMC) Ð Part 3-11: Limits Ð Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems Ð Equipment with rated current # 75 A and subject to conditional connection 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 January 2001 BSI 02-2001 ISBN 0 580 36822 X BS EN 61000-3-11:2001 Amendments issued since publication Amd. No.DateComments 13042 corrigendum February 2001 Corrects typographical errors in title and normative references clause. National foreword This British Standard is the official English language version of EN 61000-3-11:2000. It is identical with IEC 61000-3-11:2000. The UK participation in its preparation was entrusted by Technical Committee GEL/210, Electromagnetic compatability, to Subcommittee GEL/210/8, EMC - Low frequency disturbances, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. 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 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. (8523($1?67$1$5(1? 1250(?(8523e(11( (8523b,6 emission limits for other phenomena such as harmonics, may also have to be satisfied. 3.4 service current capacity the current per phase which can be taken continuously by the user at the interface point without exceeding the plant ratings used by the supply authority in the design of its system NOTE In practice the service current capacity is the rating of the main service fuse or overcurrent protection setting of the circuit breaker at the interface point. In cases where supply authorities declare supply capacities in volt-amperes, the current per phase may be deduced for single phase supplies by dividing the volt-amperes by the declared phase voltage, and for three-phase supplies by dividing it by ?3 times the declared line voltage. 4 Requirements If equipment complies with the requirements of IEC 61000-3-3 and therefore is not subject to conditional connection, it may be declared so by the manufacturer in documentation made available to users before purchase. Equipment which does not meet the limits of IEC 61000-3-3, when tested or evaluated with reference impedance Zref, is subject to conditional connection, and the manufacturer shall either: a) determine the maximum permissible system impedance Zmax at the interface point of the users supply in accordance with 6.2, declare Zmax in the equipment instruction manual and instruct the user to determine in consultation with the supply authority, if necessary, that the equipment is connected only to a supply of that impedance or less, or Page 6 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 b) test the equipment in accordance with 6.3 and declare in the equipment instruction manual that the equipment is intended for use only in premises having a service current capacity ?100 A per phase, supplied from a distribution network having a nominal voltage of 400/230 V, and instruct the user to determine in consultation with the supply authority, if necessary, that the service current capacity at the interface point is sufficient for the equipment. The equipment shall be clearly marked as being suitable for use only in premises having a service current capacity equal to or greater than 100 A per phase. NOTE 1 In the case of option a), restrictions to connection may be imposed by the supply authority on the use of equipment if the actual system impedance at the interface point on the users premises, Zact , exceeds Zmax. NOTE 2 In the case of option b), a new symbol (IEC 60417-5855) is under consideration for the purpose of marking equipment. NOTE 3 For options a) and b), if the supply capacity and/or the actual system impedance Zact have been declared to, or measured by, the user, this information may be used to assess the suitability of equipment without reference to the supply authority. 5 Limits The limits shall be applicable to voltage fluctuations and flicker at the supply terminals of the equipment under test, measured or calculated according to clause 4 under test conditions described in clause 6. Tests made to prove the compliance with the limits are considered to be type tests. The following limits apply: the value of the short-term flicker indicator, Pst shall not be greater than 1,0; the value of the long-term flicker indicator, Plt shall not be greater than 0,65; the value of d(t) during a voltage change shall not exceed 3,3 % for more than 500 ms; the relative steady-state voltage change, dc, shall not exceed 3,3 %; the maximum relative voltage change dmax, shall not exceed: a) 4 % without additional conditions; b) 6 % for equipment with: ? manual switching, or ? automatic switching more frequently than twice per day and having a delayed restart (the delay being not less than a few tens of seconds) or, ? manual restart after a power supply interruption. NOTE The cycling frequency will be further limited by the Pst and Plt limit. For example: a dmax of 6 % producing a rectangular voltage change characteristic twice per hour will give a Plt of about 0,65. c) 7 % for equipment which is attended whilst in use (for example: hair dryers, vacuum cleaners, kitchen equip- ment such as mixers, garden equipment such as lawnmowers, portable tools such as electric drills); or is switched on automatically, or is intended to be switched on manually, no more than twice per day and has a delayed restart (the delay being not less than a few tens of seconds) or manual restart after a power supply interruption. Page 7 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 In the case of equipment incorporating multiple loads, limits b) and c) shall only apply if there is delayed or manual restart after a power supply interruption; for all equipment with automatic switching which is energised immediately on restoration of supply after a power supply interruption, limits a) shall apply; for all equipment with manual switching, limits b) or c) shall apply, depending on the rate of switching. Pst and Plt requirements shall not be applicable to voltage changes caused by manual switching. The limits shall not be applicable to emergency switching or emergency operations. 6 Test, measurement and evaluation procedures An overview in the form of a flow chart showing the evaluation and test procedures used in the assessment of equipment and the leading to connection is given in Annex B. In the calculations described in the following subclauses the modulus values of complex impedances shall be used. In order to evaluate equipment and determine the maximum permissible system impedance from a type test, some auxiliary quantities are necessary. These auxiliary quantities have been given suffixes to facilitate their application in formulae and calculations; see Table 1. Table 1 Suffixes and their applications SuffixRepresentingApplication sysSystemZsys is the modulus of the impedance of the system to which the equipment may be connected in order to meet a particular limit. A number after the subscript identifies a particular calculation. refReferenceZref is the reference impedance. actActualZact is the modulus of the actual impedance of the supply existing at the interface point. maxMaximumZmax is the modulus of the maximum value of the supply impedance at which equipment meets all the limits of this standard. testTest or measurement Ztest is the modulus of the test circuit impedance at which the emission test is performed and dctest, dmax test, Pst test and Pit test are measured values. 6.1 Test and measurement procedures The test conditions specified in Annex A of IEC 61000-3-3 shall be applicable to equipment rated ?16 A. 6.1.1 Test impedance Ztest The test impedance Ztest may be lower than Zref, particularly for equipment having a rated input current 16 A. To find the optimal test impedance, two conditions shall be met. firstly, the voltage drop, ?U, caused by the equipment shall be within the range 3 % to 5 % of the test supply voltage; Page 8 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 secondly, the ratio of inductive to resistive components of Ztest given by Xtest / Rtest shall be within the range 0,5 to 0,75 (i.e. similar to the ratio of the components of Zref). NOTE The 3 % to 5 % condition ensures that the relative current changes of the equipment in the real network situation will be nearly the same as those during the test. 6.1.2 Test of equipment against Ztest The test shall be made with the test circuit specified in Figure 1, except that the impedance Zref is replaced with Ztest. Four values dc test, dmax test, Pst test and Plt test shall be measured. The definitions of dc, dmax, Pst, and Plt are given in IEC 61000-3-3. 6.1.3 Evaluation against Zref If Ztest is not equal to Zref, the measured values shall be recalculated using the following formulae: test ref testcc Z Z dd? test ref testmaxmax Z Z dd? test ref teststst Z Z PP? test ref testltlt Z Z PP? The values dc, dmax, Pst, Plt are similar to those which would be obtained by measurements using Zref as the conditions placed on Ztest in 6.1.1 ensure that the modulus values of Z test and Z ref are approximately “in phase“ and that the measured voltage, Pst and Plt values can be converted to equivalent values with reasonable accuracy by multiplying them by the ratio test ref Z Z . Provided that the conditions for dc and dmax are met with Ztest, d(t) shall be deemed to be satisfied. 6.2 Evaluation and declaration by the manufacturer of the maximum permissible system impedance In the calculations described in the following sub-clauses, the modulus values of complex impedances shall be used. 6.2.1 Comparison of calculated and measured emission values with clause 5 limits to enable a declaration of compliance with IEC 61000-3-3 If all values calculated according to 6.1.3, or measured in accordance with IEC 61000-3-3, are less than or equal to the limits in clause 5, the manufacturer may declare that “the product meets the technical requirements of IEC 61000-3-3“. Page 9 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 6.2.2 Calculation of the maximum permissible system impedance The following evaluation procedure shall be applied if the equipment emissions cannot meet the technical requirements of IEC 61000-3-3 and therefore the equipment cannot be declared compliant by the manufacturer in accordance with 6.2.1. In such a case the equipment shall only be connected to a supply having a system impedance lower than Zref. To calculate the lower system impedance, Zsys, the values of dc, dmax, Pst and Plt calculated according to 6.1.3 shall be used in the following formulae. For manual switching: max max ref1sys EUT) the toeappropriat 5 clause in givenlimit (The d d ZZ? c 2 %3 , 3 d ZZ refsys ? 2 3 st ref3sys 1 ? ? ? ? ? ? ? ? ? P ZZ 2 3 lt ref4sys 65, 0 ? ? ? ? ? ? ? ? ? P ZZ The minimum of the four calculated values of Zsys is the maximum permissible system impedance, Zmax which the manufacturer shall declare in accordance with clause 4. In consideration of voltage changes caused by manual switching, it is only required to calculate Zsys1 and Zsys2; Zmax is the minimum of the two values. See annex A for further information. Provided that the conditions for dc and dmax are met with Ztest, d(t) shall be deemed to be satisfied. 6.3 Evaluation and declaration by the manufacturer of the minimum permissible service current capacity For single phase equipment intended to be connected to public low-voltage distribution systems having a nominal voltage of 230 V line to neutral by means of a single or three-phase service having a service current supply capacity ?100 A per phase, the test impedance, Ztest, shall be set in complex terms at 0,25 + j 0,25 ?; see figure 1. For three-phase equipment intended to be connected to public low-voltage distribution systems having a nominal voltage of 400 V line to line by means of a three-phase service having a service current capacity ?100 A per phase, the test impedance, Ztest, shall be set in complex terms at 0,15 + j 0,15 ? for each line, and 0,1 + j 0,1 ? for the neutral; see figure 1. Page 10 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 Equipment tested against the test impedances specified in the previous paragraphs shall meet the limits given in clause 5. The manufacturer shall declare the minimum service current capacity in accordance with 4 b). Page 11 EN 61000311:2000 w w w . b z f x w . c o m © BSI 01-2001 Annex A (informative) Explanation of flicker exponents A.1Explanation of 6.2.2 For harmonics or flicker, the permitted perturbation of the system voltage is decreased as the system impedance is reduced, because the number of consumers influenced by the disturbances is increased and there is less diversity. However, coincidence of voltage change disturbances is very unlikely, since two