Download - Schneider Electric

GlossarySymbols:Ccapacitance or, more generally, the capacitors themselvesD (or THD) total harmonic distortiondloss angle of a capacitorf 1fundamental frequencyf aranti-resonance frequencyf nfrequency of the n th harmonic componentf rresonance frequencyj nphase angle of the n th harmonic component when t = 0I nrms current of the n th harmonic componentj complex operator such as j 2 = -1Linductance or, more generally, the reactors, producing the inductanceLsc short-circuit inductance of a network, seen from a given point, as defined by Thevenin'stheoremnthe order of a harmonic component (also referred to as the harmonic number)n arthe order of anti-resonance, i.e. the ratio of the anti-resonance frequency to thefundamental frequencyn rthe order of resonance, i.e. the ratio of the resonance frequency to the fundamentalfrequencyka positive integerpnumber of rectifier arms (also referred to as the pulse number)p 1filter losses due only to the fundamental currentp nfilter losses due only to the n th harmonic currentP (W) active powerPB pass-band of a resonant shunt filterqquality factor of a reactorQquality factor of a filterQ (var) reactive powerrresistanceRresistance (or the real part of the impedance)spectrum the distribution, at a given point, of the amplitudes of the various harmonic componentsexpressed relative to the fundamentalSsc short-circuit power of a network at a given pointTperiod of an alternating quantityUphase-to-phase rms voltageV nphase-to-neutral rms voltage of the n th harmonic componentXreactanceX 0characteristic inductance or impedance of a filterXsc short-circuit reactance of a network, seen from a given point, as defined by Thevenin'stheoremY 0amplitude of the DC componentY nrms value of the n th harmonic componentZimpedanceAbbreviations:CIGRE Conférence Internationale des Grands Réseaux Electriques (International Conferenceon Large Electrical Networks)IEC International Electrotechnical CommissionCahier Technique Schneider Electric no. 152 / p.2