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【摘要】：配电系统可划分为高压配电系统、中压配电系统和低压配电系统三部分。随着科技进步，人们提出了各种各样的配电网故障定位方法，有的理论上可行，但实用性不强，并未得到广泛应用，目前应用广泛的还是利用矩阵算法实现故障的分段定位和隔离。与这种方法形成对比的还有一种：单相接地故障行波定位方法。由于配电网发生单相接地故障时，故障信号本身非常微弱，难以识别，而且配电网线路分支多，结构复杂，一般多为树形拓扑结构，给故障测距带来了很大困难。基于行波的故障测距技术因不受系统参数、串补电容、线路不对称及互感器变换误差等因素的影响，在输电网获得了成功的应用，并取得了很好的效果。23964
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利用矩阵算法实现故障的分段定位和隔离：中低压配电系统中单电源辐射状配电网络为分析研究对象，利用数学拓扑学的原理对单电源辐射状系统进行信息矩阵建模，采用一种基于网基结构矩阵的配电网故障定位算法进行故障分析，这种新的算法优势在于从配电网络结构的基础上入手，利用故障发生时会引起的一些物理特征的变化量为信息量"对网络描述矩阵和故障信息矩阵进行一系列数学运算"进而得出定位判据"理论上的分析与实际配电网络故障区域完全吻合，进一步说明了该方法的有效性。论文网
S形注入法是利用故障时暂时闲置的电压互感器注入交流信号电流,通过检测故障线路中注入信号的路径和特征来实现故障测距和定位。在发生接 地故障后,通过电压互感器向接地线路注入特定频率的电流信号,注入信号 会沿着故障线路经接地点流入大地,用信号寻迹原理即可实现故障选线并可确定故障点。
【关键词】：中低压配电、矩阵算法、S形注入法
Research in low-voltage distribution network fault location method
【Abstract】：Distribution system can be pided into high-voltage power distribution systems, three-part medium voltage distribution systems and low-voltage distribution systems. As technology advances, it presents a wide variety of distribution network fault location method, some theoretically possible, but practicality is not strong, has not been widely used, widely used at present still using the matrix algorithm of fault segment positioning and isolation. This method of formation and there is a contrast: traveling wave single-phase ground fault locating methods. The influence of traveling wave fault location based technology in grid applications have been successful and achieved good results.
Using matrix algorithm segmentation fault location and isolation: the single supply low voltage distribution systems for the analysis of radial distribution network research object, the principle of mathematical topology for single-supply radial matrix modeling of information systems, the use of a species distribution network fault location algorithm based on network-based architecture for fault analysis matrix, this new algorithm advantage of the structure of the distribution network from the ground on the start, using some variation of the physical characteristics of the cause of failure is when the amount of information "description of the network matrix and fault information matrix math series," then come positioning criterion "theoretical analysis and practical regional distribution network fault entirely consistent, further illustrate the effectiveness of this method.
S-shaped fault injection method is the use of temporarily idle voltage transformer AC signal current injected to achieve fault location and positioning the injection characteristics of the signal path and by detecting a fault line. In the event of a ground fault, injected through the line voltage transformer to ground current signals at specific frequencies, the signal will be injected into the earth along the fault line through the ground, using the principle of signal tracing to achieve fault line selection can determine the point of failure.