Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
In a polyphase electric power system comprising a plurality of conductors which have a certain inductance and are adapted to be energized by alternating current which may have both characteristic and noncharacteristic harmonic components, and a plurality of series resonance characteristic harmonic filters operatively coupled to said conductors, the improvement comprising: an additional filter comprising comprising impedance element operatively connected to said conductors and designed to damp the noncharacteristic harmonic component of system voltage produced by the interaction of the noncharacteristic harmonic component of current and a high impedance resulting from a condition in which said inductance and the impedance of said harmonic filters resonate.
Claim 2
Dependent Claim
105 words
In a polyphase electric power system comprising a plurality of conductors which have a certain inductance and are adapted to be energized by alternating current which may have both characteristic and noncharacteristic harmonic components, and a plurality of series resonance characteristic harmonic filters operatively coupled to said conductors, the improvement comprising: an additional filter comprising comprising impedance element operatively connected to said conductors and designed to damp the noncharacteristic harmonic component of system voltage produced by the interaction of the noncharacteristic harmonic component of current and a high impedance resulting from a condition in which said inductance and the impedance of said harmonic filters resonate.
Claim 3
Dependent Claim
15 words
The power system improvement recited in claim 1 wherein said impedance element comprises a resistor.
Claim 4
Dependent Claim
27 words
The power system improvement recited in claim 2 wherein a blocking filter tuned to the fundamental frequency of said current is connected in series with said resistor.
Claim 5
Dependent Claim
22 words
The power system improvement recited in claim 3 wherein said blocking filter comprises an inductor and a capacitor connected in parallel relation.
Claim 6
Dependent Claim
77 words
In a harmonic filter for connection to the lines of a polyphase power system, the lines having an inherent inductance and being fed by a source of current having both characteristic and noncharacteristic components and wherein said harmonic filter comprises a plurality of shunt filters individually tuned to shunt certain predetermined characteristic harmonic frequencies, the improvement comprising an additional shunt filter operatively connected to said power lines to provide damping at resonant harmonic frequencies which are noncharacteristic.
Claim 7
Dependent Claim
77 words
In a harmonic filter for connection to the lines of a polyphase power system, the lines having an inherent inductance and being fed by a source of current having both characteristic and noncharacteristic components and wherein said harmonic filter comprises a plurality of shunt filters individually tuned to shunt certain predetermined characteristic harmonic frequencies, the improvement comprising an additional shunt filter operatively connected to said power lines to provide damping at resonant harmonic frequencies which are noncharacteristic.
Claim 8
Dependent Claim
43 words
The harmonic filter improvement recited in claim 5 wherein said additional shunt filter includes the series combination of a resistor and means for presenting high impedance to current of fundamental frequency and relatively low impedance to current of said resonant, noncharacteristic harmonic frequencies.
Claim 9
Dependent Claim
37 words
The harmonic filter improvement recited in claim 6 wherein said additional filter also comprises a capacitor and an inductor, the latter being connected in series relationship with said capacitor and in parallel relationship with said series combination.