Fault section identification of a three terminal line during power swing,International Transactions on Electrical Energy Systems

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Fault section identification of a three terminal line during power swing
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2021-03-02 , DOI: 10.1002/2050-7038.12849
Himanshu Shekhar ₁ , Jitendra Kumar ₁

Affiliation

Unintentional malfunctioning of the distance relay and other protective relays is the main cause of cascading outage and leads to power system failure during power swing. During prevention from power swing, power swing block (PSB) blocks the protective relay where the power system remains unprotected against the faults. Protection challenges such as fault diagnosis with fault section identification for multi‐terminal lines are very complex during PSB operation or failure of protective schemes during power swing where conventional schemes are not able to resolve aforementioned issues. Such complex situations motivate to design the protection algorithm for a three terminal line which identifies the fault section. To deal with this challenge, a communication assisted superimposed positive sequence currents (SPSCs) based technique is proposed to identify the fault section and differentiate the internal and external faults in three terminal lines during power swing. This scheme compares the maximum of SPSCs recorded at three terminals with maximum of estimated SPSCs at T‐point. Estimated SPSCs at T‐point corresponding to each particular terminal are obtained using a long line model ABCD parameter method, which requires voltage and current data measured at respective terminals. The proposed technique has been found accurate and reliable. It works irrespective of types of faults, CT saturation, noise inclusion and reclosing operation of breakers. Its superiority over existing and commercially available schemes are also proven in this paper. It has been tested in a 400 kV double circuit three terminal system and a modified form of 400 kV multi‐machine 9‐bus system using EMTDC/PSCAD.

中文翻译：

动力摆幅期间三端子线的故障部分识别

距离继电器和其他保护继电器的意外故障是级联中断的主要原因，并导致电源摆幅期间的电力系统故障。在防止电源摆幅的过程中，电源摆幅块（PSB）会阻塞保护继电器，使电源系统在发生故障时仍未受到保护。在PSB操作期间，保护挑战（例如，针对多端子线路的故障部分识别的故障诊断）非常复杂，或者在功率波动期间保护方案失败（传统方案无法解决上述问题）时，保护挑战非常复杂。这种复杂的情况促使设计用于识别故障区域的三端线路的保护算法。为了应对这一挑战，提出了一种基于通信辅助叠加正序电流（SPSCs）的技术来识别故障区域并区分功率摆幅期间三个端子线的内部和外部故障。该方案将三个终端上记录的SPSC的最大值与T点处估计的SPSC的最大值进行比较。使用长线模型ABCD参数方法获得对应于每个特定端子的T点处的估计SPSC，该方法需要在各个端子处测量电压和电流数据。已经发现所提出的技术是准确和可靠的。无论故障类型，CT饱和度，噪声是否包含以及断路器的重合闸操作，它都可以工作。本文还证明了其相对于现有和可商购方案的优越性。

更新日期：2021-04-02

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