Design and experimental research of a distribution line electroscope based on electromagnetic induction

To solve traditional distribution line electroscopes’ flaws (over-reliance on manual judgment, low detection accuracy, and no safety linkage), this study designs and tests one based on electromagnetic induction. It analyzes the parallel-plate capacitive electric field sensor’s mechanism; deduces the quantitative relationship between its output voltage, line voltage, and detection distance; and simulates 10 kV three-phase line electric field via Maxwell software (electric field intensity decreases with distance; phase A’s max is slightly higher than that of phase B at 0.7 m). Integrating multi-sensors (voltage, pressure, and height) and BeiDou positioning realizes its intelligence (height error ≤100 cm; positioning accuracy 0–5 m), raising inspection compliance to 100%. A 4G ad hoc network linkage system with SM2 encryption (packet loss ≤0.1%) reduces illegal operations to 0. Experiments show it works stably in harsh environments (−20 to 50 °C; humidity ≤95%) with live judgment error of ≤1%, supporting the distribution network’s “five-in-one” intelligent control.