Adaptive power system protection can be used to improve the performance of existing protection schemes under certain network conditions. However, their deployment in the field is impeded by their perceived inferior reliability compared to existing protection arrangements. Moreover, their validation can be problematic due to the perceived high likelihood of the occurrence of failure modes or incorrect setting selection with variable network conditions. Reliability (including risk assessment) is one of the decisive measures that can be used in the process of verifying adaptive protection scheme performance. This paper proposes a generic methodology for assessing the reliability of adaptive protection. The method involves the identification of initiating events and scenarios that lead to protection failures and quantification of the probability of the occurrence of each failure. A numerical example of the methodology for an adaptive distance protection scheme is provided
The rate of change of frequency during transmission system disturbances in UK will increase in incoming years. This is due the decreasing system inertia and increasing maximum generation loss in the system. Therefore, ROCOF protection will require higher setting to prevent unwanted operation while still ensuring correct detection of LOM condition. This paper proposes risk assessment analysis as a technique to find optimum setting which aims to minimise the risk of protection malfunction. The analysis use predicted Great Britain power system generation mix for year 2020 with gone green scenario. The study has successfuly found the optimum setting of the ROCOF protection which provides minimum overall risk under specific assumptions. The recomended setting is 0.5 Hz/s with operating time-delay 500ms.
Abstrak-Pemasangan Pembangkit Tersebar (PT) di jaringan distribusi dapat mengubah arah aliran arus saat kondisi normal dan kondisi gangguan. Hal ini dapat menyebabkan relai-relai proteksi yang sudah ada sebelum pemasangan PT tidak bekerja sebagaimana seharusnya. Relai dapat mengalami maloperasi ataupun tidak berhasil mendeteksi adanya gangguan di daerah proteksinya. Untuk itu, perlu dilakukan pengkajian ulang terhadap kerja dan koordinasi relai-relai setelah penambahan DG. Pada tulisan ini, dilakukan upaya rekonfigurasi dan resetting relai-relai proteksi setelah penambahan PT di bagian yang sensitif dari jaringan distribusi, yaitu bagian paling hilir. Perbaikan dilakukan dengan menambahkan relai arus lebih berarah untuk mengantisipasi sumber arus gangguan dari grid dan PT yang berbeda arah, serta setting ulang relai-relai akibat perubahan yang disebabkan oleh pemasangan PT. Selanjutnya, dilakukan pengujian koordinasi relai yang telah direkonfigurasi dan diresetting tersebut menggunakan software ETAP. Untuk mengantisipasi kondisi PT yang dapat berubah dilakukan variasi kapasitas PT yaitu kapasitas penuh, setengah kapasitas dan kondisi PT terlepas dari jaringan. Pengujian urutan kerja relai ini dilakukan pada berbagai titik gangguan dan untuk setiap titik gangguan disimulasikan 3 jenis gangguan yaitu gangguan tiga fasa, antar fasa dan satu fasa ke tanah. Dari pengujian tersebut didapatkan bahwa rekonfigurasi dan resetting yang sudah dilakukan berhasil memberikan koordinasi relai yang benar untuk ketiga macam kapasitas PT tersebut. Kata Kunci :, Pembangkit Tersebar , Relai arus lebih berarah, Koordinasi proteksi.Abstract-Installation of distributed generation (DG) on a distribution network can change the direction of electrical current during normal and faulted condition. This change can cause failures to operate of the existing relay protection. The failures are including unwanted operation and protection blinding. Therefore, evaluation of the existing protection after DG installation is needed. This paper proposes a method for reconfiguration and resetting of the relays after installation of a DG on the sensitive part of a distribution network i.e. the very downstream of the distribution network. The reconfiguration suggests the application of directional overcurrent relay in order to distinguish the sources of fault current: from the grid and from the DG. The reconfiguration and the resetting results then are simulated in ETAP software. The simulation is carried out for several variation i.e. DG capacity, type of fault and fault position on the network. From the simulation can be concluded that the reconfiguration and resetting of the protection relays after installation of the DG have provided a correct operation of protection coordination as intended to.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.