Return of the dedicated DFR: how IEC 61850 process bus simplifies DFR installation

Oliveira, Lucas B.; Hunt, Richard

doi:10.1049/joe.2018.0240

Cited by 5 publications

(4 citation statements)

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“…The correlation coefficient and relative error between the reformulated SCC waveform expressed by Equation ( 21) and the original one by Equation ( 1) are respectively calculated by Equation ( 5) and (6), which are: cxy = 0.999 980 063 830 419, ε = 3.987 194 171 128 92 × 10 −5 The curve of the absolute errors of the reformulated SCC is shown in Figure 13, where the maximum absolute error in the first two periods (40ms) of the waveform is marked. It can be seen that the similarity between the reformulated waveform using the first two periods (40ms) of the SCC and the original one is also quite high.…”

Section: The Correlation Analysis Between the Reformulated Scc Wavefo...mentioning

confidence: 99%

“…for the safe and reliable operation of the systems [1] [2]. In fault recording acquired by the digital devices such as fault recorders or microprocessor-based protection there contained the variation of electrical physical quantities in abnormal or fault states of power systems [3][4] [5], which is applied to performance analysis of devices, fault detection, and protective setting [6] etc. In the fault recording, such as waveforms of currents and voltages, in addition to fundamental frequency components (FFCs) there are still dc, harmonic, and inter-harmonic components [7], etc.…”

Section: Introductionmentioning

confidence: 99%

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Study on Algorithm of fault recording analysis combining its time-domain waveforms and phase-domain trajectories

Ge,

Ren,

2023

Preprint

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When the period of a sinusoidal waveform is taken as a baseline, after sampling time of fault recording are transformed into polar angles and its instantaneous values are transformed into polar diameters, the recording is transformed from its time-domain waveform in a rectangular coordinate system into the phase-domain trajectory in a polar coordinate system. In the paper the recording is analyzed base on the combination of the time-domain waveform and the phase-domain trajectory of the fault recording to mine fault feature parameters for reformulating the recording, and then the reformulated recording is used to substitute the original one to achieve various fault analysis functions in power systems. A short-circuit current containing a dc component being taken as an example, the algorithm consisting of separating, reformulating and adjusting various components from the current waveform are researched. By the algorithm the programs are created in Matlab, after their running the post-adjustment reformulated waveforms with high accuracy are obtained, and their curves of absolute errors pre- and post-adjustment are plotted. The relational problems, such as the calculation of the phase angles of samples and their errors, the accuracy of the reformulated waveforms, etc., are discussed. The research results show that there is a high correlation between the reformulated waveform using the algorithm proposed in the paper and the original one for the fault recording with only dc components, and it can be used to substitute the origin one within an error range.

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Section: The Correlation Analysis Between the Reformulated Scc Wavefo...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Algorithm of fault recording analysis combining its time-domain waveforms and phase-domain trajectories

Ge,

Ren,

2023

Preprint

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“…Con el objetivo de describir un valor normal del ancho de banda (ancho del histograma de perfusión miocárdica) para la población estudiada; se calculó un intervalo de referencia del 90% usando la metodología de Wellek y col. 24,25 , así como el paquete estadístico R (Reference intervals) 26 ; lo cual consiste en la eliminación de valores extremos y estimación de los límites del 5 y 95%, en la distribución de datos, como los valores dentro de los cuales se encuentra la normalidad. Se utilizaron los datos de los pacientes sin enfermedad y con características normales, es decir: sin sobrepeso, sin obesidad, exentos de antecedentes de tabaquismo o diabetes, clase funcional NYHA I y II, sin antecedentes cardíacos (infarto agudo de miocardio, cateterismo y/o bypass coronario), ritmo sinusal, ancho del QRS <150 mseg, sin bloqueos de ramas del haz de His y parámetros del SPECT normales (Score isquémico de estrés <3, dilatación isquémica transitoria <1.12 y un ancho de banda <135°).…”

Section: Análisis Estadísticounclassified

Disincronía miocárdica en pacientes sometidos a estudio de Spect gatillado y análisis de fase

Cadavid Blanco,

Arriaza-Madrid,

Rosales-Morales

2023

Repert. Med. Cir.

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Introducción: la perfusión miocárdica mediante SPECT gatillado (tomografía computarizada de emisión de fotón único) y análisis de fase permiten evaluar la disincronía mecánica y la fracción de eyección, indicando quienes podrían responder a la terapia de resincronización cardíaca. Objetivo: describir la frecuencia de disincronía miocárdica y su relación con los resultados del SPECT en el Hospital de San José de Bogotá entre mayo 2018 y febrero 2019. Metodología: estudio transversal en mayores de 18 años, con electrocardiograma de no más de 6 meses y SPECT gatillado. Para la información sociodemográfica, antecedentes cardíacos, parámetros de electrocardiograma y resultados del SPECT se empleó estadística descriptiva y análisis de correspondencias múltiples. Resultados: se incluyeron 539 pacientes con edad promedio de 68 años, 59.8% con sobrepeso y obesidad, 47.7% en clase funcional NYHA (New York Heart Association) III y IV, 48.4% fumadores y 26.9% diabéticos; 48.1% tenían cateterismo cardíaco y 45.3% infarto agudo de miocardio; en 31% la fracción de eyección del ventrículo izquierdo < 50%. La disincronía se determinó con un ancho de banda >135°; hubo disincronía en 202 pacientes (37.5%) que se relacionó con: género masculino, sobrepeso, diabetes, tabaquismo, infarto agudo del miocardio, colocación de stent, fracción de eyección del ventrículo izquierdo <40% o entre 40%-50% y dilatación isquémica transitoria (TID) >1.22 o entre 1.12-1.22. Discusión y conclusiones: el uso de la nueva herramienta del análisis de fase de medicina nuclear es factible y útil para determinar los pacientes respondedores a la terapia de resincronización cardíaca.

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“…Fault recording of electrical physical quantities acquired by digital fault recorders and microcomputer protection devices etc. is one of the sources of fault data, which is also used to achieve such functions as equipment performance analysis, disturbance analysis, and power system planning, etc 2 .…”

Section: Introductionmentioning

confidence: 99%

A research report on the phase-domain trajectories of fault recording and their mathematical models

Ge,

Ren,

2024

Sci Rep

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In currently known theories and algorithms of fault recording analysis and application, there is little literature where fault feature parameters are mined deeply from electrical physical quantities themselves. In this report the calculation method of the phase angles of the reference point and sample points is obtained, which ensures the correspondence of the time-domain waveform of digital fault recording with its phase-domain trajectory. The relationship between the initial phase angle of a sinusoid and the position of its trajectory, the characteristics of the trajectories of three-phase short-circuit currents containing dc components and the mathematical models of these trajectories are analyzed. Taking a rectangular wave current and a triangle wave current as example, the characteristics of the trajectories of non-sinusoidal and periodical waveforms containing harmonics are analyzed as well as their mathematical models. The research results show that the relationship between the initial phase angle of a sinusoid and the position of its circular trajectory is definite; the dc components have no impact on the positions of the trajectories of the short-circuit currents, but on their sizes and shapes; the harmonics have an impact on the shapes of the trajectories, and their positions are decided by the initial phase angles of the ac fundamental components in the waveforms. Subsequent study of the algorithm of fault recording analysis will be spread based on the contents in this report.

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Return of the dedicated DFR: how IEC 61850 process bus simplifies DFR installation

Cited by 5 publications

References 0 publications

Study on Algorithm of fault recording analysis combining its time-domain waveforms and phase-domain trajectories

Study on Algorithm of fault recording analysis combining its time-domain waveforms and phase-domain trajectories

Disincronía miocárdica en pacientes sometidos a estudio de Spect gatillado y análisis de fase

A research report on the phase-domain trajectories of fault recording and their mathematical models

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