Power Quality Problems

The most common power quality problems, their consequences and measures are summarized in the table below.
ceramic ball bearings of silicon nitride Si3N4 and zirconium dioxide ZrO2
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.