A di/dt Detection Circuit for DC Unidirectional Breaker Based on Inductor Transient Behaviour

Jeziel Vázquez, Elias J. J. Rodriguez, Jaime Arau and Nimrod Vázquez
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Jeziel Vázquez: Computer Systems Department, Instituto Tecnologico Superior del Sur de Guanajuato, Uriangato 38980, Mexico
Elias J. J. Rodriguez: Electronics Department, Tecnologico Nacional de México en Celaya, Celaya 38010, Mexico
Jaime Arau: Electronics Department, Cenidet, Cuernavaca 62490, Mexico
Nimrod Vázquez: Electronics Department, Tecnologico Nacional de México en Celaya, Celaya 38010, Mexico

Sustainability, 2021, vol. 13, issue 16, 1-18

Abstract: In this paper, a di/dt detection circuit for DC breaker applications is proposed to provide faster short-circuit and overcurrent fault detection, where DC breakers are required to be designed for unidirectional fault current conditions, which is a challenge regarding DC microgrid applications due to some associated problems such as long periods of fault interruption, complex circuit structure, and low reliability. The proposal, which is based on measurement of di/dt, can detect fault current conditions for different distances from the point of failure, and is suitable to operation in both islanding and grid-connected conditions. The proposed circuit was studied theoretically and experimentally in steady state, as well as under load changes and short circuit conditions to ensure proper operation, making this solution a fast current fault detection solution, which is a significant advantage and requirement in DC microgrid applications.

Keywords: DC breaker; DC microgrid; di/dt detection; DC protection (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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