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首页> 外文期刊>Power Engineering Review, IEEE >Distribution High Impedance Fault Detection Utilizing High Frequency Current Components
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Distribution High Impedance Fault Detection Utilizing High Frequency Current Components

机译：利用高频电流分量的配电高阻抗故障检测

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摘要

This paper describes work performed by Texas A&M University on the detection of high impedance faults on distribution primary conductors. Some grounded distribution primary conductors may exhibit a very low fault current such that they may not be cleared by over-current protection. These faults may persist indefinitely, possibly causing a fire hazard or a hazard to humans by contact with an energized line. The paper begins with an examination of the high impedance fault problem from the perspective of system protection. The fault detection theory is presented next. The system utilizes a fault-generated increase in the 2-10 kHz component of feeder current for fault detection. EPRI funding enabled the verification and demonstration of this fault detection concept. Measurements were made on several faulted and unfaulted feeders to develop a representative data base of signals to which a relay would be subject. Analysis of these data provided a time and frequency domain signature of these faults. A microcomputer-based prototype relay was constructed and installed on a typical utility feeder. It successfully detected most staged faults while not indicating a false trip during a three month demonstration.
机译：本文介绍了德州农工大学在检测配电一次导体上的高阻抗故障时所进行的工作。一些接地的配电初级导体可能会表现出非常低的故障电流，因此可能无法通过过电流保护将其清除。这些故障可能会无限期地持续存在，可能会因接触带电的线路而引起火灾或对人体造成危害。本文首先从系统保护的角度研究高阻抗故障问题。接下来介绍故障检测理论。该系统利用故障产生的馈线电流的2-10 kHz分量增加来进行故障检测。 EPRI的资助使该故障检测概念得以验证和演示。在几个有故障和无故障的馈线上进行了测量，以建立继电器将要经受的信号的代表性数据库。对这些数据的分析提供了这些故障的时域和频域特征。构建了一个基于微机的原型继电器，并将其安装在典型的公用电源馈线上。在为期三个月的演示中，它成功地检测到大多数阶段性故障，但未指示错误行程。

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