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首页> 外文期刊>International journal of electrical and power engineering >Instantaneous and Time-Overangle Protection Against Three-Phase Faults on Radial Electrical Power Systems
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Instantaneous and Time-Overangle Protection Against Three-Phase Faults on Radial Electrical Power Systems

机译：径向电力系统三相故障的瞬时和时间过大保护

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摘要

This study presents, a theoretical approach to develop a digital protection method against 3-phase short circuits on radial electrical power systems that decreases the fault clearance time and thus, increases the stability of the system. The criterion used in this proposed, protection method is the inclination angle of the envelope of the short-circuit current. The concept of the current envelope has been introduced and its change during 3-phase faults has been analyzed. The inclination angle has been calculated and its use as a criterion for protection against 3-phase faults on radial electrical power systems has been discussed. The suggested protection method has been developed with the use of mathematical modelling of the radial electrical power system. The mathematical model has been represented as a system of differential equations for currents and a system of algebraic equations for bus voltages. This model has been formulated in a rectangular coordinate system and has been developed for both steady-state and transient analyses. The curves of the envelope of the short-circuit currents during the first 2 milliseconds after the fault instant and the time grading diagrams of the proposed protection method have been illustrated.
机译：这项研究提出了一种理论方法，用于开发一种针对径向电力系统的三相短路数字保护方法，该方法可以减少故障清除时间，从而增加系统的稳定性。在此提出的保护方法的准则是短路电流的包络线的倾斜角。介绍了电流包络的概念，并分析了其在三相故障期间的变化。已经计算出了倾斜角，并讨论了其作为防止径向电力系统中的三相故障的准则。所建议的保护方法是利用径向电力系统的数学模型开发的。数学模型已表示为电流微分方程系统和总线电压代数方程系统。该模型已在直角坐标系中提出，并已针对稳态和瞬态分析进行了开发。给出了故障瞬间后的前2毫秒内短路电流的包络曲线，并给出了所提出的保护方法的时间等级图。

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