| 摘要 |
A partial discharge detection system (100) for detecting partial discharge events in an electrical component (102) includes a transducer (110) configured to receive a signal from the electrical component (110) generated due to an occurrence of a partial discharge in the electrical component (110) and responsively provide a transducer output signal to a signal processing chain (112). The signal processing chain (112) comprises one or more of the following. A filter (202/204) coupled to the transducer (110) filters the transducer output signal and responsively generates a filtered output. An amplifier (208) coupled to the filter (202/204) amplifies the filtered output and responsively provide an amplified output. A detector (210) converts the amplified output to a detected baseband signal. A filter (212) removes elements of the baseband signal that are not characteristic of partial discharge and outputs a filtered baseband output. A peak hold system matches a time scale of partial discharge events to a timescale of an analog to digital conversion process, resulting in a sampled, filtered, baseband signal. A digital signal processor (214) performs a Discrete Fourier Transform (DFT) on the filtered baseband output and responsively generates a plurality of coefficients which correspond to a plurality of different modulation frequencies of the sampled, filtered, baseband signal. A controller (114) identifies an occurrence of a partial discharge in the electrical component (110) based upon the plurality of coefficients. |
