配电网接地选线装置的研制

针对配电网中性点经可控消弧线圈接地电网单相接地故障选线困难的实际,提出接地选线新方法。给出了零序电流比幅接地选线法理论推导,得出了小电流接地系统在正常运行和发生单相接地故障时系统主要物理量的计算公式。搭建了试验模型,介绍了控制器的硬件结构及主要软件流程。硬件系统由CPU模块、模拟量采集模块、开关量输入/输出模块、液晶显示模块、电源模块和通信接口等模块组成。实验表明,该装置运算速度快、选线准确、抗干扰能力强。

Research on faulty line selection device of distribution network

The faulty line for the single phase grounding of the distribution network with neutral point earthed via controllable arc suppression coil can be selected by the zero-sequence-current-ratio method (ZSCR). The theoretical deduction of ZSCR is given and the calculation formulas for the main parameters of small current earthing system are presented for both normal and single-phase grounding conditions. Hardware structure and main software flow of the controller are introduced. The DSP chip TMS320LF2407 is used as hardcore, the system is made up of CPU module, analog data sampling module, switch input/output module, LCD display module, power module and communication interface module, etc. Experiments show that the equipment has fast calculation speed, good performance and high correctness.