Analisis Fenomena Very Fast Transient Overvoltage pada Disconnecting Switch di Gas Insulated Switchgear 150 kV Kedinding

Hakim, Moh. Gufron (2025) Analisis Fenomena Very Fast Transient Overvoltage pada Disconnecting Switch di Gas Insulated Switchgear 150 kV Kedinding. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini meneliti fenomena Very Fast Transient Overvoltage (VFTO) yang terjadi pada Gas Insulated Switchgear (GIS) 150 kV Kedinding akibat operasi Disconnecting Switch (DS). VFTO adalah tegangan lebih transien yang sangat cepat dengan frekuensi antara 30 kHz hingga 100 MHz dan amplitudo hingga 2,5 p.u., yang dapat merusak isolasi peralatan dan transformator dengan isolasi gas. Fokus penelitian adalah memodelkan sistem GIS, menganalisis pengaruh lokasi DS terhadap karakteristik VFTO, dan mengidentifikasi pengaruh muatan terperangkap pada DS yang signifikan terhadap VFTO. Penelitian ini menggunakan simulasi berbasis Electromagnetic Transient Program (EMTP) dengan data simulasi pada DS yang mengalami switching. Setiap komponen GIS yang disimulasikan akan dimodelkan berupa kapasitansi terhubung ke ground dan saluran transmisi parameter terdistribusi. Hasil penelitian menunjukkan bahwa fenomena VFTO paling signifikan terjadi pada DS yang terletak setelah transmisi, namun tegangan pada transformator daya paling signifikan terjadi pada DS yang terletak paling dekat dengan transformator daya. Amplitudo VFTO yang dihasilkan berbanding lurus dengan nilai muatan terperangkap baik pada DS maupun tegangan pada PT. Variasi nilai muatan terperangkap 2 p.u. menghasilkan amplitudo VFTO terbesar. Studi ini memberikan kontribusi penting dalam memahami karakteristik VFTO dan dapat digunakan sebagai referensi untuk mitigasi serta pengembangan teknik deteksi VFTO pada DS di GIS.
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This research investigates the Very Fast Transient Overvoltage (VFTO) phenomenon that occurs in the 150 kV Kedinding Gas Insulated Switchgear (GIS) due to Disconnecting Switch (DS) operations. VFTO is a very fast transient overvoltage with frequencies ranging from 30 kHz to 100 MHz and amplitudes up to 2.5 p.u., which can damage the insulation of equipment and gas-insulated transformers. This study focuses on modeling the GIS system, analyzing the influence of DS location on VFTO characteristics, and identifying the significant impact of trapped charges on the DS on VFTO. The research employs electromagnetic transient program (EMTP)-based simulations with simulation data on a switching DS. Each simulated GIS component is modeled as a capacitance connected to ground and a distributed parameter transmission line. The results show that the most significant VFTO phenomenon occurs at the DS located after the transmission line, but the voltage on the power transformer is most significant at the DS located closest to the power transformer. The amplitude of the generated VFTO is directly proportional to the value of trapped charges both on the DS and the voltage on the PT. A variation in trapped charge value of 2 p.u. produces the largest VFTO amplitude. This study provides a significant contribution to understanding the characteristics of VFTO and can be used as a reference for mitigation and development of VFTO detection techniques on DS in GIS.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Disconnecting Switch (DS), Gas Insulated Switchgear (GIS), Very Fast Transient Overvoltage (VFTO), Disconnecting Switch (DS), Gas Insulated Switchgear (GIS), Very Fast Transient Overvoltage (VFTO)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3226 Transients (Electricity). Electric power systems. Harmonics (Electric waves).
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Moh. Gufron Hakim
Date Deposited:	27 Jan 2025 06:02
Last Modified:	27 Jan 2025 06:02
URI:	http://repository.its.ac.id/id/eprint/116954

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