Bao Guanghai, Gao Xiaoqing, Jiang Run, Huang Kai
College of Electrical Engineering, Fuzhou University, Fuzhou 350108, China.
Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou 350108, China.
Sensors (Basel). 2019 Aug 22;19(17):3649. doi: 10.3390/s19173649.
Fault arc detection is an important technology to ensure the safe operation of electrical equipment and prevent electrical fires. The high-frequency noise of the arc current is one of the typical arc characteristics of almost all loads. In order to accurately detect arc faults in a low-voltage alternating-current (AC) system, a novel differential high-frequency current transformer (D-HFCT) sensor for collecting high-frequency arc currents was proposed. The sensitivity and frequency band of the designed sensor were verified to ensure that the acquisition requirements of the high-frequency current were satisfied. A series arc fault simulation experiment system was built, and resistive, inductive, and non-linear load and high-power shielding load experiments were carried out. Experiments showed that the sensor output signal was close to zero in the non-arc state, and the sensor output response was a high-frequency glitch in the arc state. The results were consistent for different loads, and the discrimination between normal and fault states was obvious, which proved that the sensor is suitable for series arc fault detection.
故障电弧检测是确保电气设备安全运行和预防电气火灾的一项重要技术。电弧电流的高频噪声是几乎所有负载典型的电弧特征之一。为了准确检测低压交流（AC）系统中的电弧故障，提出了一种用于采集高频电弧电流的新型差分高频电流互感器（D-HFCT）传感器。对所设计传感器的灵敏度和频带进行了验证，以确保满足高频电流的采集要求。搭建了串联电弧故障模拟实验系统，并进行了电阻性、电感性、非线性负载以及大功率屏蔽负载实验。实验表明，传感器在非电弧状态下输出信号接近零，在电弧状态下传感器输出响应为高频毛刺。不同负载的实验结果一致，正常状态与故障状态之间的判别明显，这证明该传感器适用于串联电弧故障检测。
