Limits to Impedance Relaying

Thorp, James S.; Phadke, A.G.; Horowitz, Stanley H.; Beehler, J. E.

doi:10.1109/tpas.1979.319525

Cited by 63 publications

(8 citation statements)

References 9 publications

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“…phase angle) and will typically fill in missing or delayed values with an estimate or a default value [6] reducing accuracy. The response time of certain protection relays needs to be less than four milliseconds for power systems operating at 60Hz [9], [12]. In IEC 61850 deployments, signals measured by instrument transformers are sent via the sampled value (SV) packets.…”

Section: Background and Related Workmentioning

confidence: 99%

Estimating link availability and timing delays in ethernet-based networks

Nivethan

Papa

Hawrylak

2013

Proceedings of the Eighth Annual Cyber Security and Information Intelligence Research Workshop

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Section: Background and Related Workmentioning

confidence: 99%

Estimating link availability and timing delays in ethernet-based networks

Nivethan

Papa

Hawrylak

2013

Proceedings of the Eighth Annual Cyber Security and Information Intelligence Research Workshop

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“…The error in the computed phasor depends on the size of the sampling window, and the accuracy of an impedance estimate reduces with the increase in the speed. It is shown that, faster impedance relay inevitably makes for a less accurate impedance measurement because of the transient phenomena accompanying a fault [11]. Moreover, the distance relay reach settings are questionable for UHV transmission line because of high distributed shunt capacitance [12].…”

Section: Introductionmentioning

confidence: 99%

Support vector machine based high speed protection relay for EHV/UHV transmission line

Ravishankar

Thukaram

2012

2012 2nd International Conference on Power, Control and Embedded Systems

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This paper presents a fast and accurate relaying technique for a long 765kv UHV transmission line based on support vector machine. For a long EHV/UHV transmission line with large distributed capacitance, a traditional distance relay which uses a lumped parameter model of the transmission line can cause malfunction of the relay. With a frequency of 1kHz, 1/4th cycle of instantaneous values of currents and voltages of all phases at the relying end are fed to Support Vector Machine(SVM). The SVM detects fault type accurately using 3 milliseconds of post-fault data and reduces the fault clearing time which improves the system stability and power transfer capability. The performance of relaying scheme has been checked with a typical 765kV Indian transmission System which is simulated using the Electromagnetic Transients Program(EMTP) developed by authors in which the distributed parameter line model is used. More than 15,000 different short circuit fault cases are simulated by varying fault location, fault impedance, fault incidence angle and fault type to train the SVM for high speed accurate relaying. Simulation studies have shown that the proposed relay provides fast and accurate protection irrespective of fault location, fault impedance, incidence time of fault and fault type. And also the proposed scheme can be used as augmentation for the existing relaying, particularly for Zone-2, Zone-3 protection.Index Terms-UHV transmission line protection, Electromagnetic Transients program (EMTP), support vector machine (SVM)

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“…The impedance estimated by a digital distance relay reduces with the increase in the speed at which the estimate is obtained. Hence an impedance relay with a specified reach setting cannot operate at arbitrarily high speeds (Thorp et al, 1979). The first installation of digital computer for relaying began in 1960's which made it possible to store information so that the relay engineer can control the reach characteristics of a distance relay to suit the application and develop fault location algorithms (Gilcrest et al, 1972;Rockefeller et al, 1972;IEEE Std.37.114-2004.…”

Section: Introductionmentioning

confidence: 99%

Recent techniques used in transmission line protection: A review

Babu¹,

Tripathy²,

Singh³

2011

Int. J. Eng. Sci. Tech

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This article presents a survey of the developments in digital relays for protection of transmission lines. For a modern power system, selective high speed clearance of faults on high voltage transmission lines is critical and this survey indicates the efficient and promising implementations for fault detection, classification and fault location in power transmission line protection. The work done in this area favor computerized relays, digital communication technologies and other technical developments, to avoid cascading failures and facilitate safer, secure and reliable power systems. Efforts have been made to include almost all the techniques and philosophies of transmission line protection reported in the literature up to October 2010. The focus of this article is on the most recent techniques, like artificial neural network, fuzzy logic, fuzzy-neuro, fuzzy logicwavelet based and phasor measurement unit-based concepts as well as other conventional methods used in transmission line protection.

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Limits to Impedance Relaying

Cited by 63 publications

References 9 publications

Estimating link availability and timing delays in ethernet-based networks

Estimating link availability and timing delays in ethernet-based networks

Support vector machine based high speed protection relay for EHV/UHV transmission line

Recent techniques used in transmission line protection: A review

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