| 摘要 |
The present invention relates to a fault detection method of a distribution system and a fault detection device, which automatically detect failure through singular value decomposition and wavelet transformation of a phase voltage in a relay and determine the kind of the failure. The fault detection method of a distribution system according to an embodiment of the present invention comprises a step of obtaining phase-voltage data of a distribution system; a step of performing wavelet transformation for the phase-voltage data; a step of calculating a first fault detection index (SD) using a wavelet detail coefficient value to a value as a result of the wavelet transformation; a step of calculating a second fault detection index (SA) using a wavelet approximation coefficient value to the value as a result of the wavelet transformation; and a step of detecting the failure of the distribution system using the first fault detection index and the second fault detection index. [Reference numerals] (S10) Step of obtaining phase-voltage data of a distribution system;(S20) Step of performing wavelet transformation for the phase-voltage;(S30) Step of calculating a first fault detection index (SD) using a wavelet detail to a value as a result of the wavelet transformation;(S40) Step of calculating a second fault detection index (SA) using a wavelet approximation to the value as a result of the wavelet transformation;(S50) Step of detecting the failure of the distribution system using the first fault detection index and the second fault detection index;(S60) Step for detecting the kind of failure of the distribution system by using NSD, NSA, NSS, image voltage, and AR (SA Rank), which determines the ranking of NSA1 in an ascending order, with a differential value calculated by the first fault detection index and the second fault detection index |
