Abstract
The protection relay issues increase with the penetration of distributed generation (DG) units in distribution networks. Blind protection, sympathetic tripping and failure of reclosing are the frequent problems that are created by adding DG to the distribution networks. This research focuses on the impact of reclosers on overcurrent relay blind protection areas with DGs embedded in the distribution network. The protection blinding in overcurrent relays leads to a delay or non-tripping of the relay. The conventional solution for the blinding issue is to increase the sensitivity in the relay settings. The variation of relay settings may cause problems in the distribution network. This paper investigates the effect of reclosers on eliminating blind areas and improves the reliability in the presence of DG. In this way, possible blind points of the case study are detected, and recloser relays are then installed in appropriate locations. The case study is based on realistic data of a distribution network. The DG consists of two generators with a capacity of 4 MW. The simulation is performed in DIgSILENT software.
Highlights
IntroductionThere is an increasing demand for high-quality and reliable electrical energy, and protection systems play a significant role in the improvement of system reliability [1,2]
Nowadays, there is an increasing demand for high-quality and reliable electrical energy, and protection systems play a significant role in the improvement of system reliability [1,2].One challenge for integrating different energy resources, such as distributed generation (DG), is designing a proper protection scheme [3]
This paper investigates the impact of reclosers on blinding areas of OC relays with DG penetration and fault impedance in a realistic distribution network data
Summary
There is an increasing demand for high-quality and reliable electrical energy, and protection systems play a significant role in the improvement of system reliability [1,2]. One challenge for integrating different energy resources, such as distributed generation (DG), is designing a proper protection scheme [3]. Adding DG to the distribution network changes the electrical parameters of the power system and affects the relay protection, causing several types of problems in the protection coordination. The presence of DG can cause many challenges, such as protection blind spots, decreased fault levels and false tripping of feeders in the existing protection of distribution networks [4,5]. This research concentrates on the blinding problem of OC relays in the distribution network
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