Protective device for higher harmonic filter
专利汇可以提供Protective device for higher harmonic filter专利检索，专利查询，专利分析的服务。并且PURPOSE: To enable one to detect any small trouble and to protect the device exactly by comparing two signals, which are detected from currents flowing in the main circuit and auxiliary filters and are proportional to currents in the resonance frequency band of the respective filters, with each other.
CONSTITUTION: The auxiliary filters 8a to 10a of low voltage, which are designed such that these are corresponding to the main circuit filters 8 to 10 respectively and resonant in the same degrees, are connected to the main filter bus 7 through the auxiliary transformer 14 and auxiiary bus 15. Also the currents flowing in the respective filters, for example, 8 and 8a, are fed to the regulatable output devices 20, 20a, which convert the secondary current into an arbitrary output signal and regulate it, through the current transformers 19, 19a. Only signals of the n-th degree frequency band by which both filters resonate are taken in the band-pass filter 21, the fetched signals are compared with each other, and the protective relay 22 is operated to open the breaker 6 when the difference between both signals is over the setting range. By this way, and small trouble can be exactly detected.
COPYRIGHT: (C)1979,JPO&Japio，下面是Protective device for higher harmonic filter专利的具体信息内容。
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