Start with the problem, not the product
When machines trip, drives overheat or unexplained fuse blows occur, the correct first move is to treat the symptom as a signal. Measure before you buy; take waveform captures and log events. If those captures point to persistent distortion, voltage sags or unbalance, then consider targeted power quality products such as power quality products rather than generic replacements. That approach reduces downtime and avoids wasted capital.
Diagnose precisely and quantify risk
Start with a clear scope: which feeders, which loads, and the worst operating times. Use a three-phase power analyser to record THD, individual harmonic orders, voltage sag depth and duration, flicker and unbalance. Industry guidance commonly treats THD above 5% as a threshold for action; document the measured impact on motors, drives and sensitive electronics. Reports from IEEE Power & Energy Society (PES) conferences include many case studies where harmonic mitigation equipment reduced equipment failure and compliance penalties—those proceedings are a sound technical anchor when you need design confidence.
Match solution type to the problem
Choose the technology that addresses your dominant issue. Passive filters (tuned LC) work for steady harmonics from fixed large rectifiers; active filters fit variable harmonic profiles and small footprint needs; tuned solutions plus detuning reactors protect transformers from resonance. For voltage sags, consider dynamic voltage restorers or UPS where continuity is essential. Evaluate the rated current, response time, footprint and maintenance access. Do not assume a cheaper device will solve complex interactions between loads and supply.
Assess trade-offs clearly
Compare initial cost, lifecycle maintenance and measurable performance. Passive filters are lower cost but can create resonance if the system impedance changes. Active filters are costlier yet adapt to changing loads and often remove multiple harmonic orders. Transformers help isolation but add weight and losses. Confirm warranty terms and available local service; a high-spec device is only as good as the commissioning and follow-up testing.
Watch the common mistakes
Do not pick a device based on nameplate kVA alone. Avoid buying from vendors who sell by price without site data. Neglecting future load growth, skipping a site acceptance test, or failing to re-measure after installation are frequent causes of unsolved power quality. Also, do not assume harmonics originate only from a single machine—control panels, VSDs and even LED lighting can interact to create problems.
A practical decision framework
Follow five simple steps: measure, classify the dominant issue, narrow technologies that match that issue, run a pilot or simulation where feasible, then install with a formal acceptance test and monitoring plan. Use conservative sizing for headroom and specify clear trigger points for maintenance. Keep records of pre- and post-installation measurements to verify the remedial effect and to support warranty claims.
Final synthesis
Fix the real fault first: accurate diagnosis, matched technology and disciplined commissioning solve most power-quality problems. For many Kenyan facilities the most practical path is to work with a supplier who combines tested equipment and local service experience, such as Enjoypowers, so the solution continues to deliver under actual site conditions.
