Accurate and stable power analyser

07 July 2015

Yokogawa has enhanced its WT3000 precision power analyser with the introduction of the WT3000E which is said to be the most accurate and stable power analyser currently available.

“The focus on renewable energy and the need to optimise efficiency and comply with international power quality standards is placing greater emphasis on the importance on high-quality measurements”, said Terry Marrinan, Yokogawa’s vice president, Test & Measurement, for Europe & Africa: “The WT3000E provides the necessary levels of precision to carry out these measurements, giving R&D engineers a tool that is not only the benchmark for energy efficiency measurement but also a reference for calibrating power measuring instruments in standards laboratories.”
The specified 45 to 65 Hz accuracy for the WT3000E is 0.01% of reading plus 0.03% of range. These figures are based on RMS values rather than waveform peak values. Because power ranges are the multiple of the voltage and current ranges, the actual power measurement error due to an uncertainty of 0.03% of range in a WT3000E is less than 0.01% of range for a power meter based on peak values.
These accuracy levels are said to be important for testing devices such as solar inverters, which are already working at overall efficiencies of 90-96%. To increase the efficiency, even by a few decimal points, is a challenging and important goal and the WT3000E provides the necessary levels of precision to truly confirm even the smallest improvements in efficiency.
The WT3000E has a variety of alphanumeric and graphic display formats, including the ability to display the input signal as waveforms for easy analysis. It also offers high-speed data updating which allows users to capture fast-changing transient signals with high precision. Further analysis can then be performed using the captured data.The WT3000E also includes as standard two features previously only available as options: delta calculation and cycle-by-cycle analysis. The delta calculation function allows users to calculate individual phase voltages from the line voltage measured in a three-phase/three-wire system: an important feature for determining the phase voltage in applications such as motor testing where there are no neutral lines.

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