Power Quality Problems
The most common power quality problems, their consequences and measures are summarized in the table below.
| Type of disturbance | Sources | Consequences | Actions |
|---|---|---|---|
| Rapid voltage variations | Cyclical loads, pumps, spot welds | Protection triggers, productivity limitation | Dynamic compensation, series compensation |
| Transients | Connection of capacitor banks, cables, transformers, Disconnection of inductive loads, Lightning, short circuits, earth faults | Breakdowns, protective trips, loss of production | Synchronized switches, damping circuits |
| Commutation dips | Rectifiers, frequency converters | Production stoppages, equipment failures | Power converter filters, linear reactors |
| Voltage dips | Thunder, ground fault, engine starter | Safety triggers, production stoppages, equipment breakdowns | DVR, power limiter |
| Harmonic | Rectifiers, FRO, lighting, computers, electronics | Thermal overload, equipment failures, protective trips | Harmonic filters |
| Ferroresonance | Connecting and disconnecting large loads | Transformer failures, protective trips | Damping circuits |
| Supratones | PWM converters and inverters, wind and solar power | functional failure | Broadband filters |
| Flicker | Electric arc furnaces, welding, wind power | Rapidly varying lighting intensity | Dynamic compensation |
HARMONIZER has many years of experience in measuring, analyzing and developing measures for existing power quality problems and can therefore always propose optimal technical/economic solutions.