一种复合型微机小电流接地选线装置

考虑到单一的选线方法具有局限性,将几种利用零序电流基波选线并可用同一硬件平台实现的方法结合在一起,构成复合型小电流接地选线装置。对零序电流群体比幅比相法、有功分量法和电流增量法分别进行了应用分析,并给出了选线装置的软硬件设计。实验室模拟电网试验和现场挂网结果表明,装置运行稳定,选线准确。

A Composite Ground Faulted Line Detection Device in Small Current Neutral Grounding Network

Several ground faulted line detection methods based on zero-sequence current of fundamental wave were synthetically adopted to conquer the limitation of single method application.And all these methods were achieved with the same hardware structure.Amplitude and phase comparative methods of zero-sequence currents,zero-sequence current active components method and zero-sequence current increment method were analyzed.Then the hardware and software designs of the device were given.The experimental results and the field operating results show that the device operates steadily and detects faulted line accurately.