Grounding grid breakpoint detection method based on frequency spectrum method

• Main Authors: YANG FENXIONG, CAO XIAOKE, JIANG MINGXUAN, HE DEPENG, LAN BO, WU HUIFENG, LI YOUJUN, WEI HONGTAO, ZUO GUOXING, LI RUNMIN, SUN FEI, YU GUIHUA, CAO ZHENGYU, ZHU JIANPING, WEI SHOUYI, LAN RIFENG, HUANG JIJIANG, PEI ZHEN, CAO XIAOBIN, KAN YOU
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a grounding grid breakpoint detection method based on a frequency spectrum method, belongs to the technical field of grounding grid breakpoint detection, and solves the technical problem that an existing grounding grid breakpoint detection method cannot effectively detect a fault area, and the method comprises the following steps: connecting an alternating-current variable-frequency voltage source, a non-inductive sampling resistor and a grounding grid into a series loop; measuring voltage values at two ends of the non-inductive sampling resistor by using an oscilloscope, and calculating a current value; voltage values at the two ends of the grounding grid are measured through an oscilloscope, and an impedance module value and an impedance angle of the grounding grid are calculated; drawing an impedance mode frequency spectrum curve of an impedance mode value of the grounding grid and an impedance angle frequency spectrum curve of an impedance angle, and respectively performing fitting