{"id":7898,"date":"2023-08-17T07:45:23","date_gmt":"2023-08-17T07:45:23","guid":{"rendered":"https:\/\/lhm-instrumentation.eu\/?p=7898"},"modified":"2023-11-21T10:56:03","modified_gmt":"2023-11-21T10:56:03","slug":"what-does-standard-iec-61000-4-30-class-a-mean-to-me","status":"publish","type":"post","link":"https:\/\/lhm-instrumentation.eu\/en\/kenniscentrum\/energie-power\/wat-betekent-de-standaard-iec-61000-4-30-klasse-a-voor-mij\/","title":{"rendered":"What does the IEC 61000-4-30 Class A standard mean for me?"},"content":{"rendered":"
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\"\"The IEC 61000-4-30 Class A standard eliminates guesswork when choosing a power quality instrument.<\/strong><\/span><\/p>\n

Grid power quality logging, measurement and analysis is still a relatively new and rapidly developing field. Whereas fundamental electrical measurements such as RMS (effective voltage) and current have well-defined measurement parameters, many mains power quality parameters have no such definition. This fact has forced leading manufacturers to develop their own algorithms for measuring these mains power quality properties, resulting in hundreds of unique, global measurement methods.<\/p>\n

With so much diversity between instruments, technicians often have to take the time to analyse and understand the capabilities and specific measurement algorithms of the instrument in question, rather than understanding the quality of the power supply itself. Standardising measurement methods allows direct comparison of results from different analysers.<\/p>\n

Standard IEC 61000-4-30 Class A defines the measurement methods, collection times, accuracy and evaluation for each mains power quality parameter, to obtain reliable, repeatable and comparable results. In addition, the IEC 62586 standard defines the minimum set of parameters to be implemented for mains power quality instruments used in both portable and fixed installations.<\/p>\n

As more manufacturers begin to design instruments for measuring and analysing mains power quality to Class A standards, technicians can be more confident in the measurements they take. All this increases accuracy, reliability, comparability and efficiency at work. The standard is updated periodically as the industry evolves and new measurement scenarios are discovered or required. Since its introduction in 2003, the standard has been updated several times and is currently in edition 3 (2015).<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

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Ask our experts for advice<\/span><\/a><\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

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\"\"Examples of requirements according to class A<\/h4>\n

The measurement uncertainty of the supply voltage<\/strong> is set at 0.1% of the specified input voltage Udin over the range from 10% to 150% of Udin. It is important to note that in many cases accuracy is only specified at full scale, and while 0.1% accuracy is relatively easy to achieve, it is more difficult to achieve over this wide range.<\/p>\n

In addition, the requirement states that measurements must be \u2018continuous and non-overlapping\u2019 over a 10\/12 cycle for a 50\/60 Hz electrical system. It is important to pay attention to this when looking at plant specifications, as units with a high degree of measurement uncertainty can lead to results that can be disputed by the utility or their customer.<\/p>\n

Cheap mains power quality measurement systems, for example, often have higher levels of uncertainty when measuring at the lower end of the scale (example: measuring on a potential transformer with phase-to-neutral voltage at 58 volts). In addition, variations can also go unnoticed if measurements are not taken contiguously. These errors can lead to defective equipment being thought to be working properly when in fact it is not. With a Class A certified instrument, a technician can rest assured that measurements have been classified with internationally accepted uncertainty values. This is especially important when checking compliance with regulations or comparing results between different instruments or batches. Functional test and uncertainty requirements for Class A equipment are detailed in IEC 62586-2.<\/p>\n

Voltage fluctuations and interruptions<\/strong>\u00a0should be measured on a full cycle and should be updated every half cycle so that the instrument can combine the high resolution of data points sampled on a half cycle with the accuracy of RMS calculations on a full cycle. Relying solely on full-cycle calculations could misidentify valid conditions, while using only half-cycle calculations may not provide the required accuracy to fully understand any problems.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n

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\"\"<\/h4>\n

Collection periods\u00a0<\/strong>are measurement data compressed by a mains power quality instrument at specified intervals. A Class A instrument shall display data in the following collection periods:<\/p>\n