Analisis Karakteristik Partial Discharge Akibat Gabungan Defect Eksternal pada Stator Generator Tegangan Tinggi

Prihatina, Puput Putri (2025) Analisis Karakteristik Partial Discharge Akibat Gabungan Defect Eksternal pada Stator Generator Tegangan Tinggi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Stator merupakan komponen penyumbang kerusakan terbesar pada generator, yaitu lebih dari dua pertiga dari total 56% kerusakan menurut studi CIGRE, dengan salah satu penyebab utamanya adalah peluahan sebagian (Partial Discharge, PD). Penelitian ini bertujuan untuk mengkaji karakteristik PD pada lembaran stator generator 6,6 kV akibat kombinasi cacat eksternal, yaitu peluahan korona, peluahan permukaan, dan peluahan slot. Pemodelan dilakukan dengan merekayasa kombinasi cacat berupa cacat slot pada permukaan stator, penambahan serbuk besi pada ujung belitan sebagai cacat permukaan, dan cacat korona pada lapisan cat grading. Objek uji terdiri dari satu stator full dan dua potongan stator yang masing-masing memiliki bagian bar dan ujung belitan . Pengukuran resistansi isolasi dilakukan menggunakan MegaOhm Meter dengan metode Polarization Index (PI) dan Dielectric Absorption Ratio (DAR), sedangkan pengujian tegangan tinggi dilakukan menggunakan HV Transformer dengan metode step voltage berdasarkan nilai Partial Discharge Inception Voltage (PDIV). Deteksi PD dilakukan dengan metode Phase Resolved Partial Discharge (PRPD) menggunakan PD detector, osiloskop digital, dan perangkat lunak MATLAB. Hasil pengujian menunjukkan bahwa kombinasi cacat korona-slot menghasilkan nilai resistansi isolasi, PI, DAR, dan PDIV terendah, diikuti oleh kombinasi slot-permukaan dan korona-permukaan. Setiap kombinasi cacat juga menunjukkan karakteristik pola PRPD, distribusi PD, dan fasa puncak amplitudo yang berbeda. Temuan ini diharapkan dapat menjadi referensi untuk penelitian lanjutan dan mendukung kegiatan pemeliharaan peralatan listrik guna mencegah kegagalan stator pada generator tegangan tinggi.
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The stator is the largest contributor to generator failures, accounting for more than two-thirds of the total 56% of generator-related issues, according to a study by CIGRE. One of the primary causes of stator failure is Partial Discharge (PD). This study aims to analyze the characteristics of PD on 6.6 kV generator stator laminations caused by a combination of external defects, including corona discharge, surface discharge, and slot discharge. The stator model was constructed by introducing slot defect on the stator surface, applying iron powder on the end winding to simulate surface discharge, and inducing corona discharge on the grading coating layer. The test objects consisted of one full stator and two stator segments, each containing a bar section and an end winding . Insulation resistance measurements were carried out using a MegaOhm Meter with the Polarization Index (PI) and Dielectric Absorption Ratio (DAR) methods. High-voltage testing was conducted using an HV transformer with the step voltage method, based on the Partial Discharge Inception Voltage (PDIV). PD detection was performed using the Phase Resolved Partial Discharge (PRPD) method, with data acquisition through a PD detector, digital oscilloscope, and MATLAB software. The results showed that the corona-slot combination produced the lowest values of insulation resistance, PI, DAR, and PDIV, followed by the slot-surface and corona-surface combinations. Each defect combination exhibited distinct PRPD characteristics in terms of PD distribution, phase peak magnitude, and PRPD pattern shape. These findings are expected to serve as a reference for future research and support electrical equipment maintenance practices to help prevent stator failures in high-voltage generators.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Partial Discharge, Stator, Generator Tegangan Tinggi, Phase Resolved PD,Partial Discharge, Stator, High Voltage Generator, Phase Resolved PD
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7 Turbogenerators. Steam-turbines
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Puput Putri Prihatina
Date Deposited:	24 Jul 2025 03:09
Last Modified:	24 Jul 2025 03:09
URI:	http://repository.its.ac.id/id/eprint/120939

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