Harmonics cause
ß Transformers to overheat
ß Transformer secondary voltage distortion
ß Increased power system losses
ß Telephone and wired communication systems
noise
ß Neutral overloads
Other harmonic issues
ß Watt-hour meters
ß May read high or low
ß Protective relays
ß May not sense RMS values
ß Nuisance trip or fail to trip
ß Digital clocks
ß May run fast
Solutions
ß Use full sized or oversized neutral conductors
ß Oversize or harmonic rate transformers
ß Detune system (move capacitors, install reactors)
ß Filter (install passive or active harmonic filters
Harmonics in Electric Power Systems
