Variable-speed motors and drives are normally much more efficient than fixed-speed types, but even they don’t always work at peak efficiency. An analysis of VSDs at one drinking water pumping station helped save over 20% of energy costs – repaying many thousands of Euros every year.Load measurement at input and output of a VSD The main energy cost for water companies comes from pumping water up from the well and through the network. Variable-speed drives match output to demand and so help minimize...

Grid connected photovoltaic systems are growing in importance as sustainable energy sources.The DC power of the solar panels is converted into an AC power by inverters. These are transformerless and, besides generating AC current, also inject a small DC Current. Excessive DC current injection into an AC network can cause problems like transformer saturation, however, which will cause additional losses and reduce transformer lifetime. For measuring these DC components, we need a Power Quality Analyzer...

Harmonics can cause high neutral currents in three-phase systems — even ones that are balanced. They heat up cables, which can cause fires. Many installers now check their work using a multimeter, but multimeters can’t measure harmonics.Equipment installation needs a power quality analyzerResistive (linear) loads like heating elements and incandescent lights used to dominate electrical supply networks. The last 10 years has, however, seen many more non-linear loads. Examples are LED lights, variable-speed...

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——F435检测谐波，可以避免由于谐波导致的电容器被烧事故