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You searched for subject:(Capacitive voltage transformer). Showing records 1 – 2 of 2 total matches.

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Delft University of Technology

1. Hakim, A.R. ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:.

Degree: 2015, Delft University of Technology

The thesis deals with the modeling and simulation of distance relays in ATP - EMTP. Transmission line which is 125.6 miles long operates at 60 Hz and 115 kV line voltages are simulated in ATP - EMTP. The first part of the thesis discusses the implementation and simulation of the ATP - EMTP model for microprocessor based mho distance relay using angle comparator method in the network. The model includes the modeling of input filter, sample and Fourier fundamental frequency detector, which process the input for mho distance relay model. A number of simulations of single line to ground faults (SLGF) with different fault locations were carried out to verify the correct operation of the relay based on the developed protection scheme. The results of the simulation show the operation of the relay based on its protection scheme and its response time related to the fault locations. The study is also extended to the double line to ground fault for the same purpose. The second part of the thesis discusses the model for an electromechanical mho distance relay, which includes the modeling of current transformer (CT) and capacitive voltage transformer (CVT). A validated ninth-order mathematical model of the electromechanical Mho distance relay is constructed in ATP - EMTP to observe the dynamic behavior of the relay during a critical fault. For that purpose, SLGF were tested in critical locations which is very close to the relay. The results show how CT saturation and CVT transient influence the relay operation. The applied procedure can be used for testing of distance protection performance against single phase fault currents. Advisors/Committee Members: Popov, M..

Subjects/Keywords: ATP - EMTP; microprocessor based mho distance relay; electromechanical mho distance relay; current transformer (CT); capacitive voltage transformer (CVT)

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APA (6th Edition):

Hakim, A. R. (2015). ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:735c9c97-d04e-4caf-90d4-081b13a8e464

Chicago Manual of Style (16th Edition):

Hakim, A R. “ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:.” 2015. Masters Thesis, Delft University of Technology. Accessed February 17, 2020. http://resolver.tudelft.nl/uuid:735c9c97-d04e-4caf-90d4-081b13a8e464.

MLA Handbook (7th Edition):

Hakim, A R. “ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:.” 2015. Web. 17 Feb 2020.

Vancouver:

Hakim AR. ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2020 Feb 17]. Available from: http://resolver.tudelft.nl/uuid:735c9c97-d04e-4caf-90d4-081b13a8e464.

Council of Science Editors:

Hakim AR. ATP - EMTP Modeling of Distance Relays to Simulate Single Line to Ground Fault Performance in Transmission network:. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:735c9c97-d04e-4caf-90d4-081b13a8e464

2. Liu, Tian. Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux.

Degree: Docteur es, Energie (SPI), 2011, Supélec

Le transformateur de puissance est un équipement essentiel d’un réseau électrique et le plus coûteux dans les postes. Pour augmenter son degré de disponibilité et de fiabilité, il est nécessaire d’appliquer la manœuvre contrôlée afin de diminuer la saturation du noyau lors de l’enclenchement, et donc limiter les courants d’appel. Ces derniers sont asymétriques, d’amplitude élevée, et riches en harmoniques. Ils peuvent causer des effets indésirables comme le disfonctionnement des dispositifs de protections, l’endommagement mécanique des enroulements du transformateur et réduire en général la durée de vie et la qualité des systèmes. Une technique efficace pour réduire ces courants d’appel est de mettre sous tension le transformateur quand le flux dynamique généré par la source est égal à son flux rémanent. Un modèle simplifié du transformateur de puissance est adopté pour l’analyse des phénomènes physiques liés à l’application des manœuvres. Pour évaluer le degré de faisabilité de cette technique, des simulations sont effectuées en utilisant le simulateur de réseau EMTP. Les contraintes requises pour chacun des composants du système de manœuvre contrôlée comme les segments de ligne, les disjoncteurs sont étudiées en détail pour déterminer l’algorithme de calcul de l’instant optimal de manœuvres. Ensuite des tests de validation statistiques sont effectués afin d’évaluer les performances des différentes approches employées. Enfin une étude consacrée à la reconstitution du flux rémanent via un transformateur capacitif de tension (TCT) est menée pour appliquer l’algorithme de manœuvre contrôlée dans les postes en utilisant les équipements de mesure déjà existants.

Power transformers are vital equipment in electrical networks and are the most expensive ones in substations. In order to increase their availability and reliability, controlled switching must be applied for reducing cores saturation during its energization, called “inrush currents”. These inrush currents are asymmetrical, high-magnitude, harmonic-rich, and may cause many undesirable effects such as maloperation of protective relays and fuse, mechanical damage to the transformer winding and generally reduce the lifetime and quality of power systems. An efficient technique to reduce these inrush currents is to energize the transformer when the dynamic flux generated by the source is equal to its residual flux. A simplified model is adopted to analyze the physical phenomena related to the switching applications. In order to assess the feasibility of this technique, numerous simulations have been performed using EMTP simulator. The critical requirements for each component of the controlled switching system such as pieces of line, circuit breakers have been studied in detail in order to determine the best switching instant calculation algorithm. Then statistical validation tests have been conducted to evaluate the performances of its different approaches. Finally a study dedicated to the reconstitution of residual flux using a capacitive voltage transformer (CVT)…

Advisors/Committee Members: Siguerdidjane, Houria (thesis director).

Subjects/Keywords: Transformateur de Puissance; Manœuvre Contrôlée; Courant d’Appel; Flux Rémanent; EMTP; Transformateur Capacitif de Tension; Disjoncteur; Statistiques; Power transformer; Controlled switching; Inrush current; Residual flux; EMTP; Capacitive voltage transformer; Circuit breaker; Statistics; 378.242

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Liu, T. (2011). Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux. (Doctoral Dissertation). Supélec. Retrieved from http://www.theses.fr/2011SUPL0006

Chicago Manual of Style (16th Edition):

Liu, Tian. “Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux.” 2011. Doctoral Dissertation, Supélec. Accessed February 17, 2020. http://www.theses.fr/2011SUPL0006.

MLA Handbook (7th Edition):

Liu, Tian. “Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux.” 2011. Web. 17 Feb 2020.

Vancouver:

Liu T. Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux. [Internet] [Doctoral dissertation]. Supélec; 2011. [cited 2020 Feb 17]. Available from: http://www.theses.fr/2011SUPL0006.

Council of Science Editors:

Liu T. Manoeuvre contrôlée des transformateurs de puissance avec flux rémanent. : Controlled switching of power transformers with residual flux. [Doctoral Dissertation]. Supélec; 2011. Available from: http://www.theses.fr/2011SUPL0006

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