JPS4919533B1 -
专利汇可以提供JPS4919533B1 -专利检索，专利查询，专利分析的服务。并且1,262,184. Harmonic filters for A.C. power lines; static converters. GENERAL ELECTRIC CO. 13 May, 1969 [16 May, 1968], No. 24276/69. Heading H2F. A harmonic filter for an A.C. power system particularly where connected to static converters in an H.V.D.C. link, comprises LC shunt filters 8, 9, 10, 11 (Fig. 1) to suppress individual characteristic harmonics i.e. harmonics at N times the fundamental frequency where N = 6KŒ1 for six phase converter operation and K is a positive integer, e.g. 5th, 7th etc. respectively, and an additional filter 12 to suppress non-characteristic harmonics i.e. all the remaining harmonics which can arise and produce parallel resonance. The shunt filters 8, 9, 10, 11 are tuned to provide a low impedance for predetermined frequencies to be suppressed. However, at frequencies below that for which a filter is tuned the dominant impedance will be that of the capacitive element. This impedance together with that of power factor correction capacitors 32, 33 etc. may interact with the system inherent inductance 2 to produce parallel resonance. If this occurs at a non-characteristic harmonic frequency even a small current can produce a large harmonic distortion of the system voltage. The filter 12 includes a series LC circuit 26, 25 (selected to provide a low impedance to a specific non-characteristic harmonic e.g. 4th at which parallel resonance may be expected) in which R27 represents the resistance of L26, a blocking filter 29 tuned to the fundamental f and a resistor 28 to damp the non-characteristic component of system voltage. In another embodiment, Fig. 2 (not shown), the filters are connected to the A.C. lines by way of tertiary windings of a transformer which couples a rectifier bridge to the A.C. lines. The converter bridges may be controllable valves or solid state semi-conductors.，下面是JPS4919533B1 -专利的具体信息内容。
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