Research On DC Solid State Power Controller With Arc Detection

Solid State Power Controller (SSPC) is the important equipment in advanced aircraft power distribution system, which plays the role of both switch and protection. However, in applying to reality, it is found that, except malfunctions such as over current, short circuit, arc fault is also a insecure key factor of aircraft. Therefore, to improve the aircraft security, adding the function of arcing fault detection is a develop direction of SSPC.Firstly, this paper introduces the arc's principle, characteristic property and its model development. Then, the Cassie arc model is chosen to simulation, and the waves, which are used to guide the experiment, are got.Secondly, in the laboratory condition, the experiments of series arc and parallel arc are done, and the current waves and data are got. Then, this paper makes the FFT analysis and TCA analysis with data of the arc experiments, and compares the results with normal and other faults. Then, this paper designs an algorithm to detect arcing fault, and then proves this algorithm with these data of experiments.Then, this paper describes the hardware and software design of the SSPC with arc detection. In the part of hardware, this paper describes the design of digital part and power part. In the part of software, this paper describes the main program, data process program, arcing fault detection program and communication program. During these software, this paper emphasizes on the software of arcing fault detection.Finally, the prototype of SSPC with arc fault detection is established. The experiment results are obtained on this prototype, which prove that the theories and analysis are correct.