| 摘要 |
According to one embodiment of the present invention, in an abnormality detection method an arc signal and a tracking signal are detected using an ultraviolet sensor for detecting ultraviolet light generated in a switchgear and a current sensor for measuring a tracking current in order to perform sampling on the signals, digital filtering is performed on the sampled signals using a digital finite impulse response low pass filter, the digitally filtered signals are fast Fourier transformed in order to calculate peak sizes and peak frequencies, and unique detection elements for the arc signal and tracking signal are calculated using the peak sizes and peak frequencies. The calculated detection elements are compared with a set range in order to diagnose whether or not an arc and tracking occur, a self-diagnosis is performed by measuring the voltage level of a pulse transformer of the ultraviolet sensor and the voltage level of a signal inputted to the current sensor, and a diagnosis result is transmitted to a remote monitoring device. |
