Analysis of temperature rise characteristics and overtemperature fault characteristic signal of electrical resistive circuit
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.
Electrical fireResistive electrical circuitsOvertemperature faultCharacteristic signal
NETL
NSTL
万方数据
