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Reliability Assessment of the Distribution System in the Presence of Protective Devices
Published in Ramesh Bansal, Power System Protection in Smart Grid Environment, 2019
A recloser is a protective system equipped with a device that can close the circuit breakers upstream or downstream of the system after it has been opened owing to the fault current. It is used in the distribution system to detect and isolate momentary faults. A recloser is utilised with other protective devices to enhance the continuity of power supply at the load points by restoring power supply to the distribution system after a momentary fault. A recloser has the ability to detect a fault current in a power system by isolating the faulty section of the distribution system. It is designed by the manufacturer to break the circuit after the fault current continues for a programmed time. If the electrical fault that caused the operation of the recloser has not been cleared, the recloser will remain open until the fault is cleared. In order to prevent damage, each substation along the network is protected with a recloser that turns off power in the event of a short circuit. The recloser model is presented in Figure 16.8 for clearing of a fault in the distribution system.
A review of small-signal stability analysis of DFIG-based wind power system
Published in International Journal of Modelling and Simulation, 2023
N. R. Nkosi, Ramesh C. Bansal, T. Adefarati, R. M. Naidoo, Sanjay K. Bansal
The distribution system is equipped with transformers that are located at the load points to step down the medium voltage to the utilization voltage used for commercial, residential and industrial applications. The performance of the distribution network can be improved with the application of automated solution. The automated solutions provided by many manufacturers improve the system reliability, operational efficiency and asset utilization of the distribution systems that have been previously functioned autonomously. This makes the automated distribution system to respond to local signals and conditions without human intervention. The modern distribution system is automated with supervisory control and data acquisition (SCADA), fault detection, identification and recovery (FDIR), smart sensors, substation video monitoring, line switch automation, recloser controls, volt/var optimization, voltage regulator controls, substation automation and automated switchgear controls. The benefits of distribution system automation are stated as follows: reduction of line loss, improvement of power quality, reduction of capital expenses, reduction of cost of energy, optimization of energy usage and improvement of the reliability and compatibility.
Simultaneous placement of renewable DGs and protective devices for improving the loss, reliability and economic indices of distribution system with nonlinear load model
Published in International Journal of Ambient Energy, 2020
Masoud Alilou, Vahid Talavat, Hossein Shayeghi
Vieira Pombo, Murta-Pina, and Pires (2016) have proposed a multi-objective optimal placement of switching considering DG unavailability, network reliability and equipment cost. In the study done by Velasquez, Quijano, and Cadena (2016), optimisation the location of protective switches including a circuit breaker (CB) and recloser was done in the distribution system with DG units. The profit of the distribution system operator, system average interruption duration index, system average interruption frequency index and system costs are objective functions that are considered as a single-objective and multi-objective optimisation. Considered problems have been solved through implementing the differential evolution.