EN61000-3-3 and flicker meter measurement

By: Thurlby Thandar Instruments  09-12-2011

 EN61000-3-3  European standard regulating mains voltage fluctuations - a brief summary.
Flicker and voltage fluctuations measurement - use of a FlickermeterMost people will be aware of the dimming and flickering of lights. In general, the main cause of these effects is switching operations of industrial processes and electrical appliances connected to the supply systemThe IEC standard 61000-3-3 imposes limits on the voltage changes and fluctuations induced by a given appliance connected to the mains supply. This standard requires that electrical appliances be type tested to ensure that they meet the requirements in the standard. It is applicable to all electrical and electronic equipment having an input current up to and including 16 amps per phase and intended to be connected to the public low-voltage mains distribution systems of between 220V and 250V at 50Hz line to neutral.  Tests do not need be made on equipment that is unlikely to produce significant voltage fluctuations or flickerThe limits are based on the subjective severity of the flicker imposed on the light from a 230V/60W filament lamp.Measurement of flicker is undertaken with a ‘Flickermeter’ which complies with EN60868 .
The flickermeter measures the voltage changes imposed on a specified impedance in series with
the mains supply input due to EUT current demand changes.Limits are then applied to the following parameters: 
Short term flicker severity, Pst. Long term flicker indicator, Plt. Relative steady state voltage change, dc. Maximum relative voltage change, dmax . Relative voltage change characteristic, d(t).

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