Authors

Abstract

Agricultural power distribution networks operate in harsh environments that accelerate contact wear and degrade the accuracy of conventional loop resistance testers. This study develops an APP-based wireless three-phase synchronous loop resistance testing system featuring a UC3854-based multi-stage power factor correction architecture (0–100 A constant-current output, 82–83.17% efficiency, power factor 0.99) and a supercapacitor pulse-discharge module (16 V triggering, 230 V charging). The system achieves 0.01 μΩ measurement resolution and >10,000 MΩ insulation resistance, surpassing the typical 0.1 μΩ resolution of commercial loop resistance testers. Field tests on 110 kV GIS equipment reduced wiring time from 30 min to 10 min and measurement time from 3 min to 1 min (67% efficiency improvement, ≤1% deviation). For 500 kV GIL sections (1.2 km), five-segment testing was integrated into a single continuous measurement (80% efficiency improvement). The system provides an efficient, reliable solution with stable high-current output, strong anti-interference capability, and digital management.

Abstract in Chinese

农业配电网运行于潮湿、多尘、腐蚀性环境，加速接触磨损并降低传统回路电阻测试仪的精度。本研究开发了一种基于APP的无线三相同步回路电阻测试系统，采用基于UC3854的多级功率因数校正架构（0–100 A恒流输出，效率82–83.17%，功率因数0.99）和超级电容脉冲放电模块（16 V触发，230 V充电）。系统实现0.01 μΩ测量分辨率和>10,000 MΩ绝缘电阻，优于商用回路电阻测试仪典型的0.1 μΩ分辨率。现场测试表明：110 kV GIS设备接线时间由30 min缩短至10 min，测量时间由3 min缩短至1 min（效率提升67%，偏差≤1%）；500 kV GIL区段（1.2 km）将传统五段测试整合为单次连续测量（效率提升80%）。该系统为高电流稳定输出、强抗干扰、快速接线和数字化管理的农业配电网提供了高效可靠的测试解决方案。