Abstract
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.
Highlights
With the rapid development of China’s electric power industry, various types of electrical equipment have become indispensable in people’s living and production practices, but the problem of electricidal safety cannot be ignored
For the fault signal shielding problem of the low-power fault branch caused by the high-power branch, the sensor placed on the main line can extract the low-power arc current signal because of the attenuation effect of the high-frequency core material on the low-frequency signal and the offset effect of the differential threading method on the magnetic flux
For Sensor 3, the comparison of the inductive load waveforms with the resistive load waveforms showed that the differential high-frequency current transformer (D-high-frequency current transformer (HFCT)) sensor was consistent in the fault current high-frequency signal acquisition and can help us to detect the arc fault
Summary
With the rapid development of China’s electric power industry, various types of electrical equipment have become indispensable in people’s living and production practices, but the problem of electricidal safety cannot be ignored. A novel high-frequency current sensor based on the differential threading method was put forward and used in low-voltage series arc fault detection. The amplitude of the equivalent magnetic flux induced by the high-frequency magnetic core is reduced, so that the core material works in the linear working area, and the waveform is hardly distorted In this way, the sensor can acquire the high-frequency arc fault signal. For the fault signal shielding problem of the low-power fault branch caused by the high-power branch, the sensor placed on the main line can extract the low-power arc current signal because of the attenuation effect of the high-frequency core material on the low-frequency signal and the offset effect of the differential threading method on the magnetic flux.
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