【摘要】 阻性回路长时超温故障特征信号的有效识别与分析，是表征电气火灾的关键性技术手段之一。通过三相四线制低压AC 220 V配电端纯阻性负载温升实验，制造了阻性回路的故障温升过程，高频多点采集了线路超温故障形成过程中的温度、电流、电压信号，探究了不同电流强度下的阻性回路温度变化时空分布，分析了超温故障状态下温度与电压本征信号、电压谐波信号的关系。通过回路电位分析发现了超温故障状态下回路压降与温度的线性关系，通过傅里叶分析总结出了阻性回路超温故障的电压频谱特征。实验结果分析表明，阻性回路温升过程伴随着显著的温度时空分布信号特征、压降信号特征和电压谐波信号特征，具备对超温故障的表征能力，可以为电气火灾的预防提供一种新的技术手段。更多还原

【Abstract】 Effective identification and analysis of the characteristics of resistive electrical circuits overtemperature faults signals is one of the key technical methods to characterize electrical fires. This work examined the faulty temperature rise process of resistive electrical circuits based on the pure-resistive load temperature rise experiment in three-phase four-wire low-voltage AC 220 V distribution terminals. Temperature, current, and voltage signals during the temperature rise process were collected under high frequency with multi-points. The spatiotemporal distribution of temperature changes in resistive circuits under different current intensities was explored, and the relationship between temperature-voltage intrinsic signals & voltage harmonic signals under overtemperature fault conditions was analyzed. The linear relationship between voltage drop and temperature under overtemperature fault conditions was found by circuit potential analysis, and the voltage spectrum characteristics of resistive circuit overtemperature fault were also summarized based on Fourier analysis. The experiments showed that the temperature rise process of the resistive electrical circuits was accompanied by significant temperature spatiotemporal distribution signal characteristics, voltage drop signal characteristics, and voltage harmonic signal characteristics, which can characterize overtemperature faults and provide a new technical method for the prevention of electrical fires.更多还原