Interpretasi Karakteristik Partial Discharge pada Stator Generator Akibat Kecacatan Eksternal dan Internal Menggunakan Metode Pulse Sequence Analysis

Muzakki, Ahmad Raihan (2026) Interpretasi Karakteristik Partial Discharge pada Stator Generator Akibat Kecacatan Eksternal dan Internal Menggunakan Metode Pulse Sequence Analysis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Berdasarkan studi CIGRE, kegagalan isolasi stator menyumbang sekitar 56% dari total kerusakan generator, sehingga diperlukan metode diagnosis untuk mendeteksi degradasi isolasi sejak dini. Studi ini bertujuan menginterpretasikan karakteristik partial discharge (PD) pada stator generator akibat end-winding corona discharge, end-winding surface discharge, slot discharge, dan void discharge menggunakan metode Pulse Sequence Analysis (PSA) dan Weighted Pulse Sequence Analysis (WePSA). Pengujian dilakukan dengan menentukan Partial Discharge Inception Voltage (PDIV) dan menerapkan tegangan pada level PDIV, 1,3 PDIV, dan 1,5 PDIV. Data dianalisis berdasarkan magnitudo muatan, perubahan muatan antar-pulsa, interval waktu antar-pulsa, dan pola distribusi visual. Hasil menunjukkan bahwa slot discharge memiliki PDIV terendah, yaitu 5,10 kV dan - 5,43 kV, sedangkan End-winding surface discharge positif memiliki aktivitas tertinggi sebesar 636 pulsa/s pada polaritas posisitf dan end-winding corona negatif aktivitas tertinggi pada polaritas negatif sebesar 80 pulsa/s. Pola tipikal yang berhasil diidentifikasi menggunakan PSA berupa klaster bergelombang pada plot Qᵢ₊₁ vs Δtᵢ₊₁ untuk negatif end-winding corona discharge, klaster simetris pada plot Δtᵢ₊₁ vs Δtᵢ untuk positif end-winding surface discharge dan positif slot discharge, dua klaster memanjang pada plot Qᵢ₊₁ vs Δtᵢ₊₁ untuk negatif slot discharge, serta pola menyerupai huruf Y pada plot ΔQᵢ₊₁vs ΔQᵢ untuk positif void discharge. Namun, positif end-winding corona discharge, negatif end-winding surface discharge, dan negatif void discharge belum dapat diidentifikasi secara jelas menggunakan PSA. Penerapan WePSA berhasil meningkatkan pemisahan pola sehingga ketiga defect tersebut dapat dibedakan dengan lebih jelas. Selain itu, polaritas tegangan terbukti memengaruhi karakteristik PD pada setiap defect.
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According to a CIGRE study, stator insulation failures account for approximately 56% of all generator failures, highlighting the importance of early insulation diagnosis. This study investigates the characteristics of partial discharge (PD) in generator stator insulation caused by end-winding corona, end-winding surface, slot, and void defects using Pulse Sequence Analysis (PSA) and Weighted Pulse Sequence Analysis (WePSA). Partial Discharge measurements were conducted at PDIV, 1.3 PDIV, and 1.5 PDIV levels. The analysis was based on pulse charge magnitude, charge variation, inter-pulse time intervals, and visual pattern distributions. The results show that slot discharge exhibited the lowest PDIV values, reaching 5.10 kV and −5.43 kV under positive and negative DC polarities, respectively. In contrast, positive end-winding surface discharge showed the highest discharge activity under positive polarity, with a pulse repetition rate of 636 pulses/s, whereas negative end-winding corona discharge exhibited the highest activity under negative polarity, reaching 80 pulses/s. PSA successfully identified several typical patterns, including a wavy-tail cluster for negative end-winding corona discharge, a symmetrical cluster for positive end-winding surface and positive slot discharges, two elongated clusters for negative slot discharge, and a Y-shaped pattern for positive void discharge. However, positive end-winding corona discharge, negative end-winding surface discharge, and negative void discharge could not be clearly distinguished using conventional PSA. The application of WePSA improved pattern separation and enabled clearer identification of these defect types. Furthermore, voltage polarity was found to significantly affect the Partial Discharge characteristics of each defect.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Defect, Partial Discharge, PDIV, Pulse Sequence Analysis, Stator Generator, Generator Stator, Partial Discharge
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Ahmad Raihan Muzakki
Date Deposited:	24 Jul 2026 02:18
Last Modified:	24 Jul 2026 02:18
URI:	http://repository.its.ac.id/id/eprint/136778

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