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Flicker is generated by load changes. Only the amplitude of the load change is relevant, not the absolute value. A reduction in flicker can be attained through making less frequent load changes, or smaller load changes. If the load is changed gradually (for example, by the help of
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The IEC-flicker standard states that the EUT (Equipment Under Test) has to be operated during the test in a way which is the worst case state with respect to flicker. If the EUT is operated in a (relatively) constant fashion during the whole test,
230:(which are lower). The technical report IEC TR 61547-1 defines the functions and methodology of a light flickermeter. The report details perceptibility values measurements according to the luminous flux of different types of lamps.
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IEC 61000-3-3, Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 A per phase and not subject to conditional connection, Edition 2.0,
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motor in an office building, or if a rural residence has a large water pump starting regularly on a long feeder system. The likelihood of flicker increase as the size of the changing load becomes larger with respect to the
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The perceptibility value calculation and scaling algorithm were chosen such that a P value of 1.0 corresponds to a level at which 50% of test subjects found the flicker to be both noticeable and irritating.
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of the grid by the changing load current of an equipment or facility. These fluctuations in time generate flicker. The effects can range from disturbance to
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The requirements of a flicker measurement equipment are defined in the international electro-technical standard IEC 61000-4-15.
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IEC 61000-4-15, Testing and measurement techniques – Flickermeter – Functional and design specifications, Edition 1.1, 2003-03
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is calculated according to a statistical process over a standardized 10-minute observation interval. Long term flicker
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A flickermeter is composed of several function blocks which simulate a 230 V/60 W or a 120 V/60 W
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is a visible change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply. The
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IEEE Standard 519 Recommended
Practices and Requirements for Harmonic Control in Electrical Power Systems
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Visible change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply
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From the resulting momentary value of flicker the short term flicker "perceptibility" value
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is almost impossible. In the standard there are formulas which allow the estimation of the
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In the standard IEC 61000-3-3 the observation intervals and the limiting values for
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receivers or industrial processes relying on constant electrical power.
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persons. Flicker may also affect sensitive electronic equipment such as
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265:) instead of step fashion, this also makes flicker less perceptible.
97:(reference lamp) and the human perception system (eye-brain model).
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will result. If this state is feasible and realistic this means
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is linear, i.e. halving the switched load results in half the
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The relationship between amplitude of load changes and
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on a distribution network, or frequent starting of an
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FlickerSim open source flicker measurement simulator
289:is non-linear. A halving of load changes reduces
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296:by only about 20%. In order to have half the
82:available at the point of common connection.
125:values over a standardized two-hour period.
61:Flicker may be produced, for example, if a
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238:A purely analytical calculation of
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80:prospective short-circuit current
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388:Electromagnetic compatibility
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37:is generated over the source
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383:Electric power distribution
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252:values to be expected.
86:Measurement of flicker
114:is calculated as the
393:Electronics concepts
155:Observation Interval
256:Flicker mitigation
31:Power-line flicker
18:Power line flicker
263:power electronics
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95:incandescent lamp
43:epileptic attacks
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118:of several
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319:References
234:Estimation
116:cubic mean
63:steel mill
51:television
39:impedance
307:See also
75:elevator
355:2008-06
335:Flicker
171:10 min
57:Causes
190:0.65
152:Value
174:1.0
139:and
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