IEC 61000-4-15 pdf download

IEC 61000-4-15 pdf download.Electromagnetic compatibility (EMC) – Part 4-15: Testing and measurement techniques – Flickermeter – Functional and design specifications
1 Scope and object
This part of IEC 61 000 gives a functional and design specification for flicker measuring apparatus intended to indicate the correct flicker perception level for all practical voltage fluctuation waveforms. Information is presented to enable such an instrument to be constructed. A method is given for the evaluation of flicker severity on the basis of the output of flickermeters complying with this standard. The flickermeter specifications in this part of IEC 61 000 relate only to measurements of 1 20 V and 230 V, 50 Hz and 60 Hz inputs. Characteristics of some incandescent lamps for other voltages are sufficiently similar to the values in Table 1 and Table 2, that the use of a correction factor can be applied for those other voltages. Some of these correction factors are provided in the Annex B. Detailed specifications for voltages and frequencies other than those given above, remain under consideration. The object of this part of IEC 61 000 is to provide basic information for the design and the instrumentation of an analogue or digital flicker measuring apparatus. It does not give tolerance limit values of flicker severity.
3 Parameters and symbols
3.1 Directly measured parameters and characteristics 3.1.1 General The examples in Figure B.2a, Figure B.2b, Figure B.2c and Figure B.2d are intended to assist flickermeter manufacturers with the correct implementation for the determination of the parameters specified in this clause. 3.1.2 Half period rms value of the voltage U hp Is the rms voltage of the mains supply voltage, determined over a half period, between consecutive zero crossings of the fundamental frequency voltage. 3.1.3 Half period rms value characteristics U hp (t) Are the characteristics versus time of the half period rms value, determined from successive U hp values, see also the examples in Annex B. 3.1.4 Relative half period rms value characteristics d hp (t) The characteristics versus time of the half period rms values expressed as a ratio of the nominal voltage U n 3.1.5 Steady state voltage and voltage change characteristics This subclause defines the evaluation of half cycle rms voltage values over time. Two basic conditions are recognized, being periods where the voltage remains in steady state and periods where voltage changes occur. A steady state condition exists when the voltage U hp remains within the specified tolerance band of ±0,2 % for a minimum of 1 00/1 20 half cycles (50 Hz/60 Hz) of the fundamental frequency. At the beginning of the test, the average rms voltage, as measured during the last second preceding the test observation period, shall be used as the starting reference value for d c , and d hp (t) calculations, as well as for the purpose of d max , and d(t) measurements. In the event that no steady state condition during given tests is established, the parameter d c shall be reported to be zero. As the measurement during a test progresses, and a steady state condition remains present, the sliding 1 s average value U hp_avg of U hp is determined, i.e. the last 1 00 (1 20 for 60 Hz) values of U hp are used to compute U hp_avg . This value U hp_avg is subsequently used to determine whether or not the steady state condition continues, and it is also the reference for d c and d max determination in the event that a voltage change occurs. For the determination of a new steady state condition “ d ” after a voltage change has i occurred, a first value d start_i = d hp (t = t start ) is used. Around this value a tolerance band of ±0,002 U n (±0,2 % of U n ) is determined. The steady state condition is considered to be present if U hp (t) does not leave the tolerance band for 1 00 half consecutive periods (1 20 for 60 Hz) of the fundamental frequency.