Case study

Electrical power quality survey

We established a quantitative baseline of the electrical power quality at the point of connection of an industrial site with the grid for future reference.

The challenge

Our client was planning to replace their existing on-site generation, by installing a Biomass Combined Heat and Power Plant (CHP) capable of generating 50MW of electrical power; part of which would be consumed by the plant with remainder exported to the National Grid.

Before doing so, our client needed to obtain a baseline of the existing (pre-CHP plant) power quality at the point of connection with the Distribution Network Operator (DNO).

Using this baseline as a reference, they could then ensure that the quality of the supply from the new commissioned plant would enable them to maintain the desired continuity of operation without any disruptions. Frazer Nash were asked to establish the power quality baseline.

Our solution

To define the existing power quality, we measured three key parameters of the electrical supply. First we measured the frequency, then we examined the voltage magnitude, and then we examined the voltage distortion, relating to the measurement of voltage harmonics.

These measurements took place at the point of connection, as well as various points within the industrial site, during typical operating conditions, in terms of power consumption, and over several days.

We then analysed these measurements in relation to the DNO statutory limits to establish an accurate and comprehensive definition of the current power quality.



Frazer-Nash managed to provide our client with an exhaustive and quantitative snapshot of the existing power quality at the main point of connection with the grid. This baseline will be used by our client as a reference following CHP plant commissioning to ensure that no degradation of their power quality occurs in this new configuration.


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