1、EN*50*00b 75 W 3404563 0000985 L W EUROPEAN STANDARD NORME EUROPEENNE EUROPAbCHE NORM EN 50 006 May 1975 First edition UDC 621,316.1.015,2.018.3:621.31I .62-523.8 Key words: Domestic appliance, electrical equipment Semiconducting device, control device Electrical network, supply Electric al dist urb
2、ance Electrical potential, harmonic, voltage change, fluctuation Flicker Flicker dose Flickermet er English version The limitation of disturbances in electricity supply networks caused by domestic and similar appliances equipped with electronic devices Limitation des pertubat ions apportes aux rseau
3、x dalimentation par les appareils ectrodomestiques et analogues comportant des dispositifs lectroniques. nischen Steuerungen verursacht Begrenzung von Rckwirkungen in Stomversorgungsnetzen, die durch Elektrogerte fr den Hausgebrauch und hnliche Zwecke mit elektro- werden. This European Standard was
4、accepted by CENELEC on 13th May 1975. CENELEC members are committed in accordance with CEEELEC Internal Regulations to give this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtai
5、ned on application to the CENELEC General Secretariat or to any CENELEC member. This kiropean Standard exists in three versions (English, French and German) recognized by CENELEC as equivalent. Nationaiversions in other languages rank as translations, and in case of doubt should be checked against o
6、ne of the recognized versions. CENEL;EC members are the National Electrotechnical Committees of Austria, Belgium, Denmark, Finland, France, Germany, Ireland, Italy, Netherlands, Norway, Portugal, Sweden, Switzerland and United Kingdon. CENELEC European Committee for Electrotechnical Standardization
7、Comitb Europen de Normalisation Electrotechnique Europisches Komitee fr elektrotechnische Normung GENERAL SECRETARIAT : 5, Boulevard de lEmpereur - B-1000 Brussels Copyright reserved to National Members Organizations T 2 3 4 5 6 6. i 6.2 7 Preface Purpose Scope EN*50*00b 75 W 3401.1583 000098b 3-i E
8、N 50 006 Page 3 Con tents Terminology General considerations General requirements for appliances Test and calculation methods Voltage harmonics Voltage fluctuation Practi criai application of requirements Page 4 5 5 5 12 15 18 18 . 21 30 EN*50*006 75 3404583 0000787 5 EN 50 006 Page 4 Preface She ad
9、vantages resulting from the use of semiconducting devices for the supply and control of electrical household appliances have caused rapid development of such devices. However, such appliances are liable to cause distmbances that are physiologically uncomfortable to consumers or detrimental to the sa
10、tis- factory operation of electrical appliances and to supply networks. Collaboration between supply authorities and manufacturers therefore appeared necessary to find a basis of compromise acceptable to each of the parties concerned. In addition, it was necessary to avoid each CENELEC country layin
11、g down their own rules concerning these matters, as this would have been an impediment to trade. The present standard was developed without any prior basis, as there was no existing text available in this field, and is the result of studies begun in CENELCOM and continued in CENELEC, This document w
12、ill be re-examined within a period not exceeding three years from the date of its publication. EN 50 006 Page 5 1 Purpose Household and similar electrical appliances equipped with electronic devices for supply and/or control are liable to disturb low-voltage distribution networks, It has accordingly
13、 been deemed necessary to lay down a standard in order to limit disturbances. Essentially, this standard lays down, the values not to be exceeded for two main types of disturbance: voltage harmonics, and voltage fluctuations, for an appliance tested individually and under specified conditions. 2 Sco
14、pe This standard applies to household and similar electrical appliances that consumers can buy directly such as: electric cooking and heating appliances, thermal appliances, electric motor-operated or magnetic- ally driven appliances, portable tools, light dimmers, that are sup- plied from a low-vol
15、tage network and are equipped with electronic devices for supply and/or control by phase control or burst firing. This standard does not apply to: - appliances the installation of which requires the previous approval of the suFply authority, who may still require that this standard be observed. dist
16、ribution network. ( e. g . off ice machinery) . such apparatus is being considered. - appliances not directly connected to a low-voltage public - appliances intended exclusively for professional purposes - television receivers at the present stage, but its application to The typical values referred
17、to in this standard relate to appliances that can be connected to alternating current networks with 50 Hz frequency and nominal voltages of 220 V, 220/380 V and 240/415 V. 3 Termi nology The following definiions are given in the context of the present standard. However, where possible, these definit
18、ions have been re- produced without changes from international documents: publications of the International Electrotechnical Commission - (IEC) - International Electrotechnical Vocabulary - ( IEV) - International Union for Electroheat Vocabulary - (IUE) . 3.1 Phse contro 2 The process of varying the
19、 point within the cycle at which current conduction in a path begins (IEV 11-20-095). Variations of this point as given by the value of the delay angle (3.3) make it possible to vary the power supplied to the appliance. EN*50*006 75 W 3404583 0000789 9 W EN 50 006 Page 6 Figure 1 shows a theoretical
20、 example of the current supplied to a resistive single-phase load controlled by a reverse-parallel connected pair of thyristors in series with the load and operating according to this principle. t Figure 1 - Phase control. Theoretical cbrent graph 3.2 Burst firing A control method whereby the curren
21、t is allowed to flow for an integral number of consecutive half-cycles of the voltage and is then interrupted for another integral number of voltage half-cycles. The various combinations of time during-which the current flows or is cut off enable the average power input to be varied. Figure 2 shows
22、a theoretical example of the current supplies to a resistive single-phase load controlled by a reverse-parallel connected pair of thyristors in series with the load and operating according to this principle. 3.3 DeZay angle The time, in electrical angular measure, by which the starting point of comm
23、utation is delayed by phase control in relation to rectifier operation without phase contri1 (IEC Publication 146 - 121.30). This angle, which can vary between O the same for the positive and negative half-cycles. O and 180, is not necessarily 3.4 SymmetricaZ control Control by a device designed to
24、operate in an identical manner on the positive and negative half-cycles of an alternating voltage or current (see figure 2). EN 50 006 Page 7 3.5 3.6 3.7 3.8 3.9 Figure 2 - Burst firing. Theoretical current graph. Note: (k and k: integers) Phase control is symmetrical if the delay angle is the same
25、for the positive and negative half-cycles. Burst firing is symmetrical if the time during which the current flows includes an equal number of positive and negative half-cycles and does not produce a residual d.c. component. N.B.: The definition of tolerances to provide practical criteria of symmetry
26、 is being studied. AspnetrYical controi! Control by a device designed to act in a different manner on the positive and negative haif-cycles of an alternating voltage or current. Harmonics Sinusoidal quantities of which the frequency is a whole multiple of a frequency selected as fundamental (IEV 05-
27、02-070). Note: In the context of this standard the fundamental frequency is the frequency of the supply system, i,e. 50 Hz. Hannonio components Development terms of a periodic function in the Fourier series ( IEV 05-02-075). Hannonie order (n) The ratio between he harmonic frequency and the fundamen
28、tal frequency, Harmonic content For a voltage harmonic of value n, the ratio, expressed as a percentage, of the r.m.s. value,.of the harmonic to the r.m,s. value of the fundamental. EN*50*00b 75 E 3LiOi.1583 O000771 7 H EN 50 006 Page 8 U t Figure 3.a - Voltage change of magnitude AU 0 Notes: a) 6 v
29、oltage changes are shown on the figure b) AU (%) = relative voltage change U t k 0,ls . I Figure 3.b - Sinusoidal voltage fluctuation of magnitude alo. The figure corresponds to a regular voltage fluctuation of 10 Hz frequency. Figure 3 - Illustrations .of voltage fluctuations 3.10 3.11 3.12 3.13 3.
30、14 3. i5 3.16 3.17 Voltage change A single variation of the r.m.s. value r the peak value of the supply voltage unspecified with respect to form and duration (see figure 3,s). 4agnitude of a voltage change The difference of r.m.s. or peak value of the voltage resulting from a change of voltage. When
31、 expressed as a percentage of the nominal r.m.6. or peak value of the fundamental voltage it is called relative voltage change (see figure 3.a). Number of voltage changes per minute The number of changes per minute is defined by the expression: _B T r- where N is the total number of changes occuring
32、 during the observation period T, in minutes (see 6.2.1.4). N.B.: The term “fluctuations per minute“ should not be used. Voztage fluctuatwn A series of voltage changes regular or irregular (see figure 3.b). N.B.: This term should not be confused with “flicker“. Fluctuation urne form The form of the
33、variation of the r.m.s. or peak value of the voltage as a function of time (see figure 3.b). 14agnitude of the uoltage fluctuation The difference between maximum and minimum r.m,s. or peak values of the voltage (see figure 3.b). It may be expressed as a percentage of the corresponding value of the u
34、ndisturbed voltage. Light f ticker Impression of fluctuating luminance occuring when the frequency of the variation of the light stimulus lies between a few hertz and the fusion frequency of the images (IEV 45-25-275). Note: The present standard does not express the actual changes of luminance but t
35、he magnitude of the voltage changes which, when applied to an ordinary incandescent lamp, would bring about those changes of luminance. Threshold of flicker perceptibitity The minimum luminance fluctuation perceptible by a large majority of the population subjected to this fluctuation, EN*50*00b 75
36、3YOq583 0000993 O EN 50 006 Page 10 3.18 Threshold of flicker irritability The maximum luminance fluctuation that can be tolerated by a large majority of the population subjected to this fluctuation without discomfort. 3.19 Flicker dose The notion of flicker dose is based on the experimental fact th
37、at a sinusoidal voltage fluctuation of magnitude af and of frequency f can be replaced by a sinusoidal voltage fluctuation with magnitude alo and frequency 10 Hz that will bring about the same visual discomfort during the same period of time. The amplitude a, of the equivalent voltage fluctuation ma
38、gnitude is given by the F ormula: where : gf is a coefficient taken from the curve (figure 4) which shows af is the magnitude of the actual sinusoidal voltage fluctuation the variation of gffj with respect to frequency; with frequency f. f- a Figure 4 - Curve g(f) = - lo for equal feeling of irritat
39、ion at “f any frequency f EN*50*00h 75 W 3LIOLI583 0000994 2 EiN 50 006 Page 11 Where the actual voltage fluctuation is in the form of repeated voltage changes with magnetude and frequency more or less variable such a fluctuation can be considered to be the resultant of sinusoidal fluctuations of ma
40、gnitudes a, a2, .) a frequencies f , f2, . y fn. In such case the magnitude a fluctuation is given by the %mula: and of n of the equivalent 10 Hz sinusoidal The discomfort brought about by flicker resulting from a sinusoidal fluctuation of magnitude a and frequency f during a period of time 8 is giv
41、en by the expression: f g2 * e = alOe 2 Of f From a more general point of view, the discomfort brought about by a flicker resulting from any fluctuation equivalent to a 10 Hz sinusoidal fluctuation of magnitude a,0 at time t is given for a period of time, 8 y by the following expression defined as t
42、he flicker dose: 8 O 2 The unit of flicker dose in the (%) -mir. (per cent squared minute): an observer submitted for one minute to a flicker produced by a voltage fluctuation of 1% magnitude and 10 Hz frequency will there- fore receive a unit dose of flicker. The curve of flicker dose as a function
43、 of time is drawn by summing the partial flicker doses corresponding to the consecutive integration intervals of one minute. Note: It has been proved experimentally that a sinusoidal modulation at 10 Hz of the 50 HZ voltage of a constant magnitude of 0,3% corresponds to the threshold of perceptibili
44、ty of flicker, The corresponding dose curve is a straight line. The dose curve of the flicker arising from a given appliance can be compared to this straight line, and it may be concluded that if the curve has a greater slope than the straight line, the flicker will be perceptible . EN*50*00b 75 W 3
45、404583 0000775 4 EN 50 006 Page 12 4 General considerations 4 . 1 The growing use of appliances with phase control and burst firing is causing a substantial increase in harmonics and voltage fluctuations in low-voltage distribution networks. These disturbances may have detrimental effects particular
46、ly on the operation of electrical machines, capacitors, meters, centralized telecontrol systems, lighting, television receivers and electronic equipment. 4.2 Phase control devices cause distortion of the current taken by the appliance which in turn gives rise to voltage harmonics in the network. In
47、some cases, especially when varying the delay angle for exsunple,.the variations of the current input may cause voltage fluctuations resulting in flicker. There is also an increased consumption of reactive energy. 4.3 The use of burst firing causes variations of the current supplied to the appliance
48、 which in turn result in voltage changes. These variations may give rise to flicker to an extent depending on their magnitude and frequency. Electricd appliances equipped with electronic control devices for supply and/or control, particularly those equipped with devices that are intentionally made a
49、symmetrical, can give rise: a) under fault conditions, to a d.c. component in the leakage current which may affect the operation of differential earth- leakage circuit-breakers. b) under normal operating conditions, to a d.c. component in the input current which may cause a saturation effect in transformers if a certain value is exceeded. 4.4 Note: A precise relationship does not necessarily exist between the value of the d.c. component in the input current under normal conditions and the value of the d.c. component which may exist in the leakage current under fault
