Furthermore, in many cases it is important to record the waveform signal itself before during and after the event. For instance, low cost PQAs will only record the U RMS(1/2) of the effected phase for a very short duration, while more advanced analyzers will record both the U RMS(1/2) and I RMS(1/2) of all phases (both phase to phase and phase to ground). When looking at manufacturersвЂ™ specification it is important to understand what the instrument recording capabilities are. The IEC 6 standard doesnвЂ™t specify what should be recorded when event happens or the recording duration before and after the event. Move the handle to see the influence of the resolution on the measurement outputs:Д®vents evaluation is made by two parameters: voltage deviation from the reference voltage and duration. In The example below: the left side shows 1/2 cycle RMS values (colored in red), the right side shows 10 cycles RMS values (colored in black). It is also important to note that this measurement method is used for quasi-stationary signals and not for the detection of power quality events such dips (Sags), swells, interruptions, transient and RVC (Rapid Voltage Changes).

Increasing the resolution to 10/12 cycle will shorten the recording period to a few minutes only. Therefore, recording of 1 week can be done only at 10min resolution. In a typical PQA ( Power Quality Analyzer) without a continuous waveform recording, the recording period depends on the recording resolution. Hence, it is highly important to look at the manufacturer specifications to verify its recording capability. It is important to note that the standard does not specify any requirement for the recording resolution. Measurement uncertainty is set to 0.1% of U din (the declared input voltage) over the range of 10 вЂ“ 150 % of U din. Aggregations of 150/180 cycles (~3sec), 10min and 2 hours are also required. The magnitude of the supply voltage is the RMS values over 10/12 cycles (~200msec) time interval for a 50/60 Hz power systems respectively. Since its introduction in 2003, the standard has been updated several times and is currently on its 3 rd Edition.

The standard is periodically updated as the industry evolves and new measurement scenarios are discovered or required. Additionally, the IEC 62586-1 defines EMC, safety and environmental requirement for power quality analyzers in different installation conditions and the IEC 62586-2 defines the test and uncertainty requirement to comply with IEC 6 class A. The IEC 6 standard defines the measurement method, accuracy and time aggregation to verity of power quality parameters in 3 performance classes to obtain repeatable and comparable results. This where the IEC comes in it standardizes the measurement methodologies and creates the ability to directly compare results from different analyzers. There are a large number of parameters involved in this, but surprisingly, many power quality parameters have not been well defined which forced leading power monitoring device manufactures to develop their own methodologies resulting in incomparable values and rules between different instruments. In order to achieve this aim it is necessary to constantly and vigilantly monitor the power conditions within an electrical network. Power quality refers to a set of electrical boundaries defined by various documented rules designed to allow electrical equipment to function in its intended manner without significant loss of performance or life expectancy, this includes the steady and stable supply of electricity delivered by the grid.

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