Kuncoro, Ahmad Anung Probo (2026) Analisis Kerusakan Ferroresonance Suppression Circuit Pada Capacitive Voltage Transformer. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Capacitive Voltage Transformer (CVT) merupakan transformator instrumen yang menurunkan tegangan sistem transmisi untuk kebutuhan pengukuran, proteksi, dan kontrol. Struktur CVT yang terdiri atas pembagi tegangan kapasitif, intermediate voltage transformer, reaktor kompensasi, burden, dan Ferroresonance Suppression Circuit (FRSC) menyebabkan respons transien yang lebih kompleks dibandingkan transformator tegangan elektromagnetik konvensional. Penelitian ini menganalisis anomali kerusakan FRSC pada CVT Fasa T Bay 150 kV Gedebage 1 di Gas-Insulated Switchgear (GIS) Kiaracondong melalui simulasi transien elektromagnetik menggunakan ATP-EMTP/ATPDraw.Model dikembangkan berdasarkan data nameplate CVT, parameter FRSC, dan histori gangguan di GIS Kiaracondong. Simulasi mencakup validasi keadaan tunak, gangguan KRCDG-BDSLN 1, KRCDG-BDSLN 2, dan Trafo 3, serta variasi resistansi, induktansi, kapasitansi, leakage, dan kondisi kegagalan FRSC. Pada keadaan tunak, tegangan sekunder sebesar 57,717 V root mean square (RMS) memiliki deviasi −0,030% terhadap nilai nominal 57,735 V RMS. Hasil ini menunjukkan bahwa rasio tegangan model sesuai sebagai dasar studi sensitivitas respons transien dalam batas asumsi rangkaian ekuivalen yang digunakan. KRCDG-BDSLN 1 menghasilkan respons tegangan paling berat dengan VSEC peak sebesar 708,01 V atau 8,67 p.u. terhadap baseline nominal. Namun, keterkaitan dengan anomali hotspot lebih tepat dianalisis melalui energi pada cabang R-FRSC. Energi meningkat ketika L-FRSC menyimpang dari nilai nominal. Skenario E0, yang merepresentasikan temuan lapangan C-FRSC sebesar 0,26 µF, menghasilkan energi redaman 1,048 J pada KRCDG-BDSLN 1 dan 1,232 J pada Trafo 3. Hasil tersebut menunjukkan bahwa perubahan parameter FRSC dapat meningkatkan energi dan rugi-rugi pada cabang redaman sehingga konsisten secara elektromagnetik dengan indikasi anomali termal. Simulasi digunakan sebagai dasar analisis mekanisme dan rekomendasi pemeliharaan, bukan sebagai bukti tunggal penyebab kerusakan fisik.
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A Capacitive Voltage Transformer (CVT) is an instrument transformer that reduces transmission-system voltage for measurement, protection, and control applications. Its internal components, including a capacitive voltage divider, intermediate voltage transformer, compensating reactor, burden, and Ferroresonance Suppression Circuit (FRSC), produce a more complex transient response than conventional electromagnetic voltage transformers. This study analyzes an FRSC damage anomaly in the phase-T CVT at the 150 kV Gedebage 1 bay of Kiaracondong Gas-Insulated Switchgear (GIS) using ATP-EMTP/ATPDraw electromagnetic transient simulations. The model was developed using CVT nameplate data, FRSC parameters, and recorded disturbance histories at Kiaracondong GIS. The simulations include steady-state validation, KRCDG-BDSLN 1, KRCDG-BDSLN 2, and TRF 3 disturbances, as well as variations in FRSC resistance, inductance, capacitance, leakage, and failure conditions. Under steady-state conditions, the simulated secondary voltage is 57.717 V root mean square (RMS), with a deviation of −0.030% from the nominal value of 57.735 V RMS. This result indicates that the model’s voltage ratio is suitable as a basis for transient-response sensitivity studies within the assumptions of the equivalent circuit. KRCDG-BDSLN 1 produces the most severe voltage response, with a VSEC peak of 708.01 V or 8.67 p.u. relative to the nominal baseline. However, the field hotspot anomaly is more appropriately evaluated through the energy dissipated in the R-FRSC branch. The dissipated energy increases when L-FRSC deviates from its nominal value. Scenario E0, representing the measured C-FRSC value of 0.26 µF, produces 1.048 J under KRCDG-BDSLN 1 and 1.232 J under TRF 3. These results demonstrate that FRSC parameter deviations can increase energy dissipation and losses in the damping branch, which is electromagnetically consistent with the observed thermal anomaly. The simulation supports mechanism analysis and maintenance recommendations but is not considered conclusive evidence of the physical failure cause.
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