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http://dx.doi.org/10.5762/KAIS.2021.22.5.22

A Study on Detection Algorithm of Open Phase Fault in Grid-Connected Transformer for PV System  

Kang, Kab-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
Tae, Dong-Hyun (Department of Electrical Engineering, Korea University of Technology and Education)
Lee, Hu-Dong (Department of Electrical Engineering, Korea University of Technology and Education)
Rho, Dae-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.5, 2021 , pp. 22-33 More about this Journal
Abstract
In the case of open phase faults caused by the disconnection of distribution feeders interconnected to a PV system, many problems can occur depending on the core type and wiring method of the grid-connected transformers. Moreover, open phase faults are difficult to detect because the open phase voltage of the existing protection relay (Open Phase Relay (47)) can be maintained, even though a disconnection fault occurred, depending on the wiring method and the iron core type of the grid-connected transformer for a PV system. Therefore, this paper proposes a novel algorithm to detect open phase faults by comparing the currents and phases between the primary and secondary sides of a grid-connected transformer. In addition, this paper presents the modeling of a distribution system and protection devices for detecting open phase faults using PSCAD/EMTDC S/W, and implements a test protection device for detecting open phase faults based on the above-mentioned modeling. The simulation and test results confirmed that the proposed algorithm is useful for detecting open phase faults according to the wiring method and iron core type of grid-connected transformer for a PV system because operation slope and unbalance rate of the primary current exceed the setting value (30[%]) of the protection device.
Keywords
Open Phase Fault; PV System; PSCAD/EMTDC; Reverse Power Flow; Grid-Connected Transformer;
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