Topic
Power-system protection
About: Power-system protection is a research topic. Over the lifetime, 6353 publications have been published within this topic receiving 117961 citations.
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19 Apr 1993
TL;DR: In this article, an advanced static VAr compensator (SVC) using the world largest GTOs, that is a self-commutated SVC, has been developed for power system stabilization.
Abstract: For power system stabilization, an advanced static VAr compensator (SVC) using the world largest GTOs, that is a self-commutated SVC, has been developed. The series connection technique of many high power GTOs for realization of a high voltage power converter was established. The effectiveness of voltage stabilization in power systems was verified through field tests and these large capacity self-commutated converters offer prospects of application to power systems. This paper introduces essential techniques for development, present the state of field tests, and proposes a new overcurrent protection method for high voltage power converters composed of many series-connected devices. >
38 citations
01 Jan 1993
TL;DR: An algorithm has been developed which would set and coordinate directional overcurrent relays in an online mode to respond to the changing conditions, operational or structural, of the power system in a self-adaptive manner.
Abstract: The concept of adaptive protection has been applied to the problem of setting and coordinating directional overcurrent relays in an interconnected power system. An algorithm has been developed which would set and coordinate the relays in an online mode. The relays are made to respond to the changing conditions, operational or structural, of the power system in a self-adaptive manner.
38 citations
TL;DR: In this paper, the per phase impedance between the measurement and fault points on a transmission line is calculated based on a justifiable assumption of the fault path being purely resistive, implying that the unmeasured fault point voltage and fault path current are in phase with each other.
Abstract: This paper describes a new algorithm to calculate the per phase impedance between the measurement and fault points on a transmission line, featuring robustness to the uncertainties in load current and fault path resistance. The algorithm, which is ideal for distance relaying, is derived based on a justifiable assumption of the fault path being purely resistive, implying that the unmeasured fault point voltage and fault path current are in phase with each other. This paper illustrates the characteristics of the proposed algorithm and evaluates its performance by using PSCAD/EMTDC simulation.
38 citations
TL;DR: In this article, a detection and signaling system was proposed to identify and locate high impedance faults caused by broken conductors on distribution primary feeders, where the working principle of the proposed system consists on monitoring the voltage unbalance along a feeder.
Abstract: This paper presents a detection and signaling system designed to identify and locate high impedance faults caused by broken conductors on distribution primary feeders. Unlike conventional protection systems, which perform current sensing, the working principle of the proposed system consists on monitoring the voltage unbalance along a feeder. This allows the system to detect a fault occurrence even in cases when the conductor touches a high impedance earth surface (for instance asphalt). This system has an additional advantage of giving an indication of the location of a fault since it involves measurements at multiple points on a feeder. In order to detect the voltage unbalance produced by a broken conductor, a new sensor was developed which is sensitive to the electric field generated by primary feeders. A carrier communication channel is associated to each sensor allowing the high impedance fault occurrence information to reach the protection equipment located closer to or at the substation.
38 citations