What power quality analysis is
Power quality analysis, or grid quality analysis, examines the electrical supply to determine how far it deviates from the ideal. The aim is not academic: understanding these deviations lets operators keep equipment running efficiently and safely in everyday use.
The topic sits at the intersection of electrical safety, energy efficiency and reliable supply. A basic grasp of what is being measured, and why, is enough to act on the results without needing to master every technical detail first.
The parameters that define quality
Real supplies are never perfectly sinusoidal. The most relevant quantities are harmonics (distortion of the waveform by higher-frequency components), flicker (rapid fluctuations in voltage that can be seen as light changes), voltage unbalance between the three phases, and transients (short, fast voltage spikes).
These parameters are assessed against EN 50160, the European standard that defines the voltage characteristics a public supply network should provide. Measuring against a standard turns a vague impression of 'bad power' into concrete, comparable figures.
Measuring with a power analyzer
A mobile three-phase power analyzer such as the Chauvin-Arnoux CA8336 is used to run grid quality campaigns to EN 50160. For operators of combined heat and power (CHP), biogas and smaller generating plants, it delivers dependable data on harmonics, flicker, unbalance and transients.
The decisive factor is not the instrument alone but the campaign setup. Terminal selection, measurement duration and trigger settings determine whether the recorded data actually reflects the disturbances that matter. A poorly planned measurement can miss intermittent problems that a well-designed one captures.
Why it matters for plant operators
Generating and industrial plants both feed and draw current, so their power quality affects and is affected by the network around them. For a CHP unit, whose electrical efficiency is typically in the range of 38–43 percent and whose total efficiency with heat recovery can exceed 85 percent, stable, clean power is part of protecting that performance.
Poor power quality can stress equipment and complicate operation. Documented measurements also support technical assessments and compliance work, giving operators evidence rather than assumptions when discussing supply conditions with grid partners.
From measurement to continuous monitoring
A single campaign gives a snapshot; continuous monitoring shows how quality changes over time and under different load conditions. This matters as grids absorb more variable renewable generation, which has coincided with growing grid-stability challenges in Germany.
Stromfee combines measurement technology with ongoing monitoring so that harmonics, flicker, unbalance and transients can be tracked, not just captured once. Persistent visibility is what turns a diagnosis into lasting improvement of electrical energy quality.
FAQ
What is power quality?
It describes how closely a supply's voltage and current match the ideal sinusoidal shape. Deviations such as harmonics, flicker, voltage unbalance and transients reduce quality and can affect equipment and efficiency.
Which standard is used to assess it?
EN 50160 defines the voltage characteristics a public network should provide. Grid quality campaigns measure harmonics, flicker, unbalance and transients against this standard to produce comparable results.
What does a power analyzer measure?
A mobile three-phase analyzer like the CA8336 records harmonics, flicker, unbalance and transients. Good results depend on the campaign setup: terminal selection, measurement duration and trigger settings.
Why do CHP and generating plants need power quality analysis?
They both feed and draw current, so supply quality affects their operation and efficiency. Documented measurements support safe operation and technical assessments with concrete data instead of assumptions.