Filtering for protective relays

Schweitzer, Edmund O.; Hou, D.

doi:10.1109/wescan.1993.270548

Cited by 122 publications

(51 citation statements)

References 5 publications

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“…10). In studies performed for the evaluation of digital filters [12] for the estimation of the fundamental component the Cosine filter presented good results in the rejection of the DC component during the fault period [12].…”

Section: Distance Relay Modelmentioning

confidence: 99%

“…Also, some frequency components as inter-harmonics and sub-harmonics generated by the wind power plant [6] are not filtered by the distance relays and this causes problems in fault detection [12]. The main focus of the analysis presented in this paper is to obtain a better estimate of fundamental frequency phasors of voltage and current signals required by distance relays, because due to non-filtered frequency components, the conventional digital N 3 filters generate an error in the fundamental frequency phasor estimation, and by consequence a fault detection problem.…”

Section: Introductionmentioning

confidence: 99%

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Error compensation in distance relays caused by wind power plants in the power grid

Guajardo

Enrı́quez

Leonowicz

2014

Electric Power Systems Research

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Section: Distance Relay Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Error compensation in distance relays caused by wind power plants in the power grid

Guajardo

Enrı́quez

Leonowicz

2014

Electric Power Systems Research

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“…The main reason for this inherent timing characteristic is that the speed of a microprocessor-based relay is dominated by the signal processing filter window [3]. As the filter window fills with fault samples, the phasor measurements transition from their prefault values to their fault values.…”

Section: Nonsevere = M2p and Not M1pmentioning

confidence: 99%

Design and testing of a system to classify faults for a generation-shedding RAS

Baskin¹,

Thompson²,

Lawhead³

2009

2009 62nd Annual Conference for Protective Relay Engineers

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The PacifiCorp Jim Bridger Power Plant has 2.2 GW of installed capacity and is connected to the main grid by three 345 kV series-compensated lines. These lines are, on average, over 200 miles long. In order to operate at full capacity and maintain stability during a system contingency, Jim Bridger requires a generation-shedding remedial action scheme (RAS). PacifiCorp is modernizing and upgrading this scheme. The design of the RAS requires inputs from the protection systems and a special RAS logic relay on critical lines near Jim Bridger. This relay communicates the severity of the fault so that the proper amount of generation is shed, maintaining stability without overshedding. The RAS logic relay must quickly and accurately classify the fault in one of three categories: three phase, multiphase, or single line to ground. It must also accurately classify the fault as severe or nonsevere, as determined by the distance from the Jim Bridger bus. This paper discusses the design of the RAS system, the challenges faced in designing the RAS logic relay, the novel method that was developed for classifying the fault type, and the validation and optimization of the RAS logic relay using a realtime digital simulator.

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“…Computation of synchronized phasors in real time occurs through the use of filtering systems [5,6,7,8]. In steady state, a phasor value is independent from the filtering system; different filtering systems provide the same output.…”

Section: Phasor Representation In Steady and Transient Statesmentioning

confidence: 99%

Synchronized phasor measurement in protective relays for protection, control, and analysis of electric power systems

Benmouyal¹,

Schweitzer²,

Guzmán³

2004

57th Annual Conference for Protective Relay Engineers, 2004

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The advent of satellite-based time-keeping systems and advances in computer technology have made possible protective relay sampling synchronization within 1 µs. These relays can now provide synchronized phasor measurements that eliminate the need to have different devices for protection, control, and electric power system analysis for system-wide applications and traditional protection applications. System-wide applications have different sampling and signal processing requirements than do traditional protection applications. These different requirements normally are addressed with different devices, one device for each specific function. This paper proposes combining the aforementioned applications in a single device with a flexible signal processing system. The addition of synchrophasor measurement in a protective relay results in increased power system reliability and provides easier disturbance analysis, protection, and control capabilities than do approaches with different information sources.

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Filtering for protective relays

Cited by 122 publications

References 5 publications

Error compensation in distance relays caused by wind power plants in the power grid

Error compensation in distance relays caused by wind power plants in the power grid

Design and testing of a system to classify faults for a generation-shedding RAS

Synchronized phasor measurement in protective relays for protection, control, and analysis of electric power systems

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