Logical selectivity for medium voltage overcurrent protection and its verification via co-simulation tool for the responses of the power and communication network.

Abbas, Junaid (2018) Logical selectivity for medium voltage overcurrent protection and its verification via co-simulation tool for the responses of the power and communication network. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria dell'energia elettrica [LM-DM270], Documento ad accesso riservato.
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Abstract

This thesis deals with the modelling and simulation of MV network overcurrent protection using EMTP. Transmission lines 25 Km in length for both radial and loop network with constant parameters operates at 50 Hz and 66 kV line to line voltages are simulated using EMTP. The first part of the thesis discusses the simulation of Radial network with unearthed neutral for analysing the behaviour of the fault current making the comparison with healthy feeder. Second part is to use a Radial network with compensated neutral, Petersen Coil (PC) is used for compensation of the short circuit current making the similar comparison. Third step is to design a 67N directional replay protection in EMTP to trip the circuit breaker in the fault situation. Then using both Radial and Loop network, a comparison and response of the 67N protection in both situations is analysed. Several 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 the operation of the relay based on its protection scheme and its response time based on the fault location. Finally, delay between the blocking signals are inserted to see the behaviour of the protection system under loop network configuration.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Abbas, Junaid
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Electrical Engineering
Ordinamento Cds
DM270
Parole chiave
EMTP,67N protection,Radial network,Loop network,Simulation,Single Line to Ground Faults (SNGF),Circuit Breaker (CB),Distribution Generation (DG),Medium Voltage (MV)
Data di discussione della Tesi
16 Marzo 2018
URI

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