Single-phase grounding line selection method suitable for resonant grounding system

• Main Authors: CAO WENSI, LU GAIFENG, ZHU XUELING, YIN JUN, HUANG HUI, XU MINGMING, ZHANG KUI, ZHANG CHI, MIN CHAO
• Format: Patent
• Language: Chinese; English
• Published: 27.08.2021
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention aims to provide a single-phase grounding line selection method suitable for a resonant grounding system, which is used for improving the single-phase grounding fault line selection capability of a resonant grounding power distribution network, reducing the influence range of a fault and improving the reliability of power supply, and can decompose a transient zero-sequence current based on an EEMD algorithm to obtain IMF components with frequencies from high to low. Research on each component finds that the first three IMF components obtained through decomposition contain most of information of an original signal transient process. According to the method, the transient zero-sequence current is subjected to signal reconstruction by using the first three IMF components, and finally line selection is performed by comparing the difference of the reconstructed signals, so that high-frequency information reflecting the main components of the signals can be extracted from the transient zero-sequence cu