Some applications of phasor measurements to adaptive protection

Thorp, James S.; Phadke, A.G.; Horowitz, Stanley H.; Begović, Miroslav

doi:10.1109/59.192936

Cited by 91 publications

(28 citation statements)

References 13 publications

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“…The approach does not depend on the apparent impedance. It considers the three-phase voltage and current 60/50 Hz phasors at each end of the line to be obtained, with local synchronization [9]. Data from different ends are communicated to another processor to calculate the fault location.…”

mentioning

confidence: 99%

A new fault location technique for two- and three-terminal lines

Girgis

Hart

Peterson

1992

IEEE Trans. Power Delivery

322

109

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This paper presents a new method for the computation of fault location in two-and three-terminal high voltage lines. The method is based on digital computation of the three-phase current and voltage 60/50 Hz phasors at the line terminals. The method is independent of fault type and insensitive to source impedance variation or fault resistance. Furthermore, it considers the synchronization errors in sampling the current and voltage waveforms at the different line terminals. The method can be used on-line following the operation of digital relays or off-line using data transferred to a central processor &om digital transient recording apparatus. The paper starts with a twotefininal line to explain the principles and then presents the technique for a three-terminal line. The proposed technique was first tested using data obtained from a steady state fault analysis program to evaluate the convergence, observability and uniqueness of the solution. The technique was then tested using Em-generated transient data The test results show the high accuracy of the proposed technique. Lines INTRODUCIIONThe development of digital fault location techniques for transmission lines has been a subject of interest to researchers and power enginems tor the last decade. An accurate fault location technique is of special importance in improving postfault analysis for line inspection and routine maintenance. A fault location technique can be implemented as part of a digital distance relay, a stand-alone device, or an independent algorithm using data obtained by digital fault recorders for post-fault analysis. Many of the algorithms assume data to be available at one. terminal of the line. In this case, the apparent impedance and the prefault currents can be used to compute the fault location t1-41. Infeed currents and fault resistances are sources of errors in these fault location algorithms. Different approaches were implemented to reduce the effect of fault resistance. One approach considered the fault current flowing in the fault resistance for single-line-to-ground fault cases to be proportional to the zero-sequence current at the relay [2]. Therefore, the apparent impedance is considered to be 91 W 167-7 PURD by the IEEE Power System Relaying Committee of the IEEE Power Engineering Society for presentation at the IEEE/PES 1991 Winter Meeting, New York, New York, February -3, 1991. September 1, 1990; made available for printing December 18, 1990. A paper recommended and approved Manuscript submitted *M. W. L. Peterson is presently with err anti International control^ Corporation where Vr is the relay voltage signal Iris the relay current signal I, is the zero-sequence current at the relay D is the distance to the fault. RI and Xi are the line resistance and reactance per mile RF is the unknown fault resistanceUsing the real and imaginq components of equation (1) leads to two equations in two unknowns (D and RF). The equations are then solved for D. In case of interphase faults (bc fault for example), the current flowing in the fault ...

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mentioning

confidence: 99%

A new fault location technique for two- and three-terminal lines

Girgis

Hart

Peterson

1992

IEEE Trans. Power Delivery

322

109

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“…When a protection system detects instability, remedial action schemes can involve network separation or load shedding. Two approaches have been described to implement a network out-of-step application [18,19,20,21]:…”

Section: Special Protection Systems and Network Out-of-step Relayingmentioning

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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“…Phasors from several or even selected key places must be communicated to a central location where stability swing evaluation and prediction are to be carried out. A prediction algorithm has been developed by Thorp et al (1988) for detection of instability.…”

Section: Rotor Angle Swingmentioning

confidence: 99%

Comparison of microprocessor systems for real-time phasor measurements for large-scale power systems: a case study

El-Shal

1990

International Journal of Systems Science

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To cite this article: SHENDY M. EL-SHAL (1990) Comparison of microprocessor systems for real-time phasor measurements for large-scale power systems: a case studyRecent progress in microprocessor-based relaying systems and the technology involved in the new measurement systems lor assessment 01 on-line dynamic security 01 electric power systems are described. The technique 01 obtaining the measurements lrom selected locations on interconnected electric power systems is presented. The measurements require a number of algorithms that have been developed. A comparison 01 the diKcrent approaches has also k n conducted using a realistic system lor confirmation 01 the developed technique.

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Some applications of phasor measurements to adaptive protection

Cited by 91 publications

References 13 publications

A new fault location technique for two- and three-terminal lines

A new fault location technique for two- and three-terminal lines

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

Comparison of microprocessor systems for real-time phasor measurements for large-scale power systems: a case study

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