基于半波傅氏算法的小电流接地选线装置设计

为了解决小电流接地系统中单相接地故障选线困难的问题,经过现场调研分析了现有选线方法无法有效地检出和切除故障相的原因。然后对小电流接地系统单相接地故障的特征和选线原理进行了深入的理论分析,并对小电流接地选线方法进行了阐述。在此基础上提出了基于半波傅氏算法的接地保护原理,建立了基于半波傅氏算法的动作判据算法模型。根据动作判据,设计了小电流接地系统单相接地故障选线系统,并对系统的硬件部分进行了选型。

Design of a small current grounding line selection device based on a half-wave Fourier algorithm

Selecting single-phase ground faults in small current systems is difficult. To tackle this, first the reason why the existing line selection methods cannot effectively detect and remove the fault phase is analyzed after on-site investigation. The characteristics of the single-phase grounding fault and the principle of line selection of a small current grounding system are analyzed in depth. The method of grounding line selection for small current is described. On this basis, the principle of grounding protection based on a half-wave Fourier algorithm is proposed. An action criterion algorithm based on a half-wave Fourier algorithm is established. Given the action criterion, a single-phase ground fault line selection system for small current grounding system is designed, and the hardware part of the system is selected. This work is supported by National Natural Science Foundation of China (No. 5187070061).