EN 60868-1993 en Flickermeter - Functional and Design Specifications《闪烁计 功能和设计规范(IEC 868-1986+A1-1990)》.pdf
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1、= 3404583 0075777 683 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60868 April 1993 UDC 621.317.7 Supersedes HD 498 S2 : 1992 Descriptois: Measuring instnment, flickennetei; design, performance, specification, test English version Flickermeter - Functional and design specifications (IEC 868
2、: 1986 + Al : 1990) Mickenntre - Spcifications fonctionnelles et de conception Auslegungsspezif ikation (CE1 868 : 1986 + Al : 1990) Flickermeter - Funktionsbeschreibung und (IEC 868 : 1986 + Al : 1990) This European Standard was approved by CENELEC on 1993-03-09. CENELEC inembers are bound to compl
3、y with the CENICENELEC Internal Regulations which stipulate the conditions for giving 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 obtained on application to the Central Secr
4、etariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as
5、the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electr
6、otechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fiir Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1093 Copyright reserved to CENELEC members Ref. No. EN 60868 : 1993 E 3qOq583 0075778 5LT Page 2 EN 60868: 1993 For
7、eword At the request of 72 Technical Board, HD 498 S2 : 1992 (IEC 868 : 1986 + Al : 1990) was submitted to the CENELEC voting procedure for conveision into a European Standard. The text of the International Standard was approved by CENELEC as EN 60868 on 9 March 1993, The following dates were fixed:
8、 - latest date of publication of an identical national standard (dp) 1994-03-01 - latest date of withdrawal of conflicting national standards (dow) - Aiinexes designated normative are pait of the body of the standard. In this standard, annex ZA is normative. m 3404583 0075779 4.56 Page 3 EN 60868 :
9、1993 CONTENTS Page INTRODUCTION . 4 Clause 1. Scope and object . 4 4 2. Description of the instrument . 3. Specification . 7 4. Type test specifications . 11 FIGURES 15 APPENDIX A - Evaluation of flicker severity on the basis of the output of the IEC ANNEX ZA - (normative) Other international public
10、ations quoted in this standard 17 21 flickermeter . with the references of the relevant European publications . m 3404583 0075780 178 m Page 4 EN 60868 : 1993 FLICKERMETER FUNCTIONAL AND DESIGN SPECIFICATIONS INTRODUCTION This report gives a functional and design specification for flicker measuring
11、apparatus intended to indicate the correct flicker perception level for all practical voltage fluctuation waveforms. Sufficient information is presented to enable such an instrument to be constructed. The method of flicker severity assessment from flickermeter output data will form the subject of ot
12、her publications. In its present form, this report is not intended to be an appendix to IEC Publications 555-3 : Disturbances in Supply Systems Caused by Household Appliances and Similar Electrical Equipment, Part 3 : Voltage Fluctuations. This report is based on specifications prepared by the Distu
13、rbances Study Committee of the Inter- national Union for Electroheat (UIE). 1. Scope aiid object The purpose of this report is to provide basic information for the design and the implementation It does not specify the method of calculating a flicker severity value, or give tolerable limit of an anal
14、ogue or digital flicker measuring apparatus. values. 2. Description of the instrument The description given below is based on an analogue implementation. A partly or completely digital meter is equally acceptable provided that it offers the same functional characteristics. The flickermeter architect
15、ure is described by the block diagram of Figure 1, page 29, and can be divided into two parts, each performing one of the following tasks : - simulation of the response of the lamp-eye-brain chain ; - on-line statistical analysis of the flicker signal and presentation of the results. The first task
16、is performed by blocks 2, 3 and 4 of Figure 1, whilst the second task is accom- plished by block 5. Although this last block is not mandatory, as flicker signal analysis can be performed off-line using a suitable recording medium, its inclusion is recommended because it will allow a more complete an
17、d efficient use of the instrument. 2.1 Block 1 - Input voltage adaptor and calibration checking circuit This block contains a signal generator to check the calibration of the flickermeter on site and a voltage adapting circuit that scales the mean r.m.s. value of the input mains frequency voltage do
18、wn to an internal reference level. In this way flicker measurements can be made independently from the actual input carrier voltage level and expressed as a percent ratio. Taps on the input 3404583 0075783 004 Page 5 EN 60868 : 1993 transformer establish suitable input voltage ranges to keep the inp
19、ut sigrial to the voltage adaptor within its permissible range. 2.2 Block 2 - Square law demodulator The purpose of this block is to recover the voltage fluctuation by squaring the input voltage scaled to the reference level, thus simulating the behaviour of the lamp. 2.3 Blocks 3 and 4 - Weighting
20、filters, squaring and smoothing or follow the selective filter circuit. demodulator output. Block 3 is composed of a cascade of two filters and a measuring range selector, which can precede The first filter eliminates the d.c. and double mains frequency ripple components of the The second does the s
21、haping of the flickermeter frequency response to the modulating fluctu- ation, as follows : the weighting filter block simulates the frequency response to sinusoidal voltage fluctuations of a coiled coil filament gas filled lamp (60 W - 230 V) combined with the human visual system. The response func
22、tion is based on the perceptibility threshold found for each frequency on 50% of the persons tested*. Block 4 is composed of a squaring multiplier and a first order low-pass filter. The human flicker sensation via lamp, eye and brain is simulated by the combined non-linear response of blocks 2,3 and
23、 4. Block 3 alone is based on the borderline perceptibility curve for sinusoidal voltage fluctuations ; the correct weighting of non-sinusoidal and stochastic fluctuations is achieved by an appropriate choice of the complex transfer function for blocks 3 and 4. Accordingly the correct performance of
24、 the model has also been checked with periodic rectangular signals as well as with transient signals. The output of block 4 represents the instantaneous flicker sensation. 2.4 Block 5 - On-line statistical analysis allowing direct calculation of significant evaluation parameters. methods of deriving
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