Circuit topology node monitoring device in low-voltage distribution area

The utility model discloses a low-voltage distribution area line topology node monitoring device, and relates to the field of line topology node monitoring. A capacitor charging and discharging reactive pulse current method and the like are adopted, the charging and discharging of the capacitor need time, the response speed is low, only power frequency signals can be formed, and the capacitor is extremely easy to submerge and not easy to recognize. A low-voltage distribution area line topology node monitoring device comprises a rectification voltage stabilizing circuit used for converting commercial power into direct current, and a switching circuit connected with the rectification voltage stabilizing circuit and used for generating constant current characteristic signals. The switching circuit comprises a switching resistor located between a phase line and a zero line of the low-voltage distribution line, and the switching circuit generates characteristic current signals through the switching resistor. Accor