Following is the summary of how harmonics affect on power system components. GENERATOR: Production of pulsating or oscillating torques which involve torsional oscillations of rotor elements of TG set and rotor heating MOTOR: Stator and rotor copper losses increase due to harmonic current flow, leakage flux created by harmonic currents
Year: 2014
EFFECTS OF HARMONICS ON GENERATORS In comparison with utility power supplies, the effects of harmonic voltages and harmonic currents are significantly more pronounced on generators (esp. stand-alone generators used a back-up or those on the ships or used in marine applications) due to their source impedance being typically three to
a) Power factor correction capacitors are generally installed in industrial plants and commercial buildings. Fluorescent lighting used in these facilities also normally has capacitors fitted internally to improve the individual light fittings own power factor. The harmonic currents can interact with these capacitances and system inductances, and occasionally excite parallel
There are different causes for power system transients. For example, lightning strokes to the wires in the power system or to ground and component switching either of network components or end user equipment can produce transients. Nature of power system transients are very much event dependent. Short duration events can
In electrical power system, harmonics are not desirable in most of the applications and operations. Harmonics have adverse effect on power system equipment as well as on its operation. Harmonics can create resonance in power system network. Damping property may change due to the presence of harmonics. Also it has
IEEE Task Force on the Effects of Harmonics on Equipment has made a wide study on this matter. The result can be summarized as follows: 1. TELEVISION RECEIVERS: Harmonics changes in TV picture size and brightness. Inter-harmonics changes amplitude modulation of the fundamental frequency. For example, even a 0.5% inter-harmonic
Harmonics has effect on Capacitor Banks in various ways 1. DIELECTRIC LOSS: Harmonic voltage increases the dielectric loss in capacitors. 2. THERMAL STRESS: Harmonic voltage increases the stress on capacitor bank and the system connected to the bank. 3. RESONANCE: Harmonics cause series and parallel resonances between the capacitors and
1. Harmonics degrade the operating characteristics of protective relays. Effect of harmonics on relay depends on the design features and principles of operation. 2. Some digital relays and algorithms operate on sample data and zero crossing moment. Harmonic distortion creates error on such operation. 3. Harmonics make higher di/dt at
Harmonics has effect on measuring instruments in various ways 1. Error: Measuring instruments are calibrated on purely sinusoidal alternating current but they are used on a distorted electricity supply. This introduces error in measurement. 2. Sign of error: Sign of error depends on the magnitude and the direction of the
Harmonics has effect on transmission line in various ways. 1. Skin effect and Proximity effect: these effects depend on frequency. Harmonics increase these effects. As a result effective ac resistance increases in presence of harmonics. 2. Loss: Additional harmonic current increases copper loss of transmission system and reduce power transmitting
