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Improving high voltage power system performanceusing arc suppression coils

机译:改善高压电力系统性能使用消弧线圈

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摘要

Arc suppression coils provide a low cost method of increasing both the reliability and safety of high voltage transmission and distribution systems. Although the concept is not new, the advent of modern control equipment allows fresh opportunities for them to be used to save lives and to decrease the cost and inconvenience to industry and the community in general that is caused by electricity supply interruptions without incurring large expenditure. Earth fault currents are reduced to almost zero, thus eliminating many short time power supply interruptions and preventing damage to the electricity supply system at the time of the initial fault. Because of the reduction in damage at the time of the fault, many longer duration interruptions are avoided. It is common for live high voltage conductors to be close to the ground and for the fault not to be detected by conventional power system protection equipment. Arc suppression coil systems can detect high impedance earth faults and broken conductors which cannot be detected by conventional protection systems.There are many system abnormalities which can cause neutral voltages in arc suppression coil systems. The appropriate action to be taken by the protection system depends on the type of system abnormality. The causes of neutral voltages in arc suppression coil systems are analysed and criteria are developed to differentiate between them based on the phase angle and magnitude of the neutral voltage. Fully computerised power system protection systems are now being implemented. These modern protection systems will be able to utilise the criteria developed in this research to take immediate appropriate action based on the neutral voltage caused by the system abnormality.In existing distribution systems there is a widespread use of two single phase pole mounted auto-transformers connected in open-delta configuration to provide economic in-line three phase voltage regulation. An original method of representing open delta regulators in symmetrical component analyses is developed. It is shown that when open-delta regulators are used in a power system equipped with an arc suppression coil very high voltages can occur. A solution is proposed whereby three single phase pole mounted auto-transformers connected in a closed-delta arrangement are used.One of the potential problems with these systems is cross country faults caused by the neutral voltage displacement combined with the transient voltages at the time of the initial earth fault. These transient over-voltages are analysed in detail and a method of testing the capability of existing system components to withstand the over-voltages is developed. Simple methods to estimate the transient voltages on overhead power systems are derived. A new method of minimising the transient over-voltages is proposed.
机译:消弧线圈提供了一种提高高压输配电系统的可靠性和安全性的低成本方法。尽管这个概念并不是什么新鲜事物,但是现代控制设备的出现允许人们利用新的机会来挽救生命,减少因电力供应中断而给工业和整个社区带来的成本和不便,而又不会产生大笔支出。接地故障电流几乎减小到零,从而消除了许多短时电源中断,并防止了发生初始故障时对供电系统的损坏。由于减少了故障时的损坏,避免了许多较长的中断时间。带电的高压导体通常靠近地面,而传统的电力系统保护设备无法检测到故障。消弧线圈系统可以检测到常规保护系统无法检测到的高阻抗接地故障和导体破损。许多系统异常会导致消弧线圈系统中性电压。保护系统要采取的适当措施取决于系统异常的类型。分析了消弧线圈系统中中性电压的原因,并根据中性电压的相角和大小,制定了区分中性电压的标准。现在正在实施完全计算机化的电力系统保护系统。这些现代保护系统将能够利用本研究中开发的标准,基于系统异常引起的中性电压,立即采取适当的措施。在现有的配电系统中,广泛使用了连接的两个单相极点安装的自耦变压器以开放三角形配置提供经济的在线三相电压调节。提出了在对称分量分析中表示开环增量调节器的原始方法。结果表明,在配备消弧线圈的电源系统中使用开三角稳压器时,可能会产生很高的电压。提出了一种解决方案,其中使用了三个以闭合三角形布置方式连接的单相极点安装的自耦变压器。这些系统的潜在问题之一是由于中性点电压位移与瞬时电压相结合而引起的越野故障。最初的接地故障。对这些瞬态过电压进行了详细分析,并开发了一种测试现有系统组件承受过电压的能力的方法。推导了估算架空电力系统上暂态电压的简单方法。提出了一种最小化瞬态过电压的新方法。

著录项

  • 作者

    Burgess Robert Thomas;

  • 作者单位
  • 年度 2011
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
  • 中图分类

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