Klasifikasi dan Interpretasi Partial Discharge Akibat Kecacatan Internal Isolasi pada Stator Generator Tegangan Tinggi

Mahardhika, Defazh (2024) Klasifikasi dan Interpretasi Partial Discharge Akibat Kecacatan Internal Isolasi pada Stator Generator Tegangan Tinggi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Isolasi pada belitan stator generator merupakan aspek penting yang mempengaruhi keandalan operasi dan umur dari generator. Penelitian ini berfokus pada karakteristik partial discharge (PD) akibat cacat internal isolasi bar stator generator. Pengujian dilakukan dengan menginjeksikan tegangan AC pada stator bar generator. Tegangan ini divariasikan berdasarkan inception voltage, 4 kV, dan 6,6 kV untuk melihat pengaruh besar tegangan terhadap pola dan distribusi PD. Selain variasi tegangan, stator bar juga divariasikan berdasarkan cacat internal isolasi stator dengan volume tertentu untuk melihat pengaruh volume pada tingkat keparahan isolasi dan pola distribusi pulsa PD. Adapun cacat yang akan divariasikan yaitu void kecil, void besar, delaminasi, multi void, dan kombinasi delaminasi dengan multi void. Sinyal PD akan ditangkap menggunakan High Frequency Current Transformer ( HFCT ) lalu disimpan dan ditampilkan pada osiloskop. Metode Phase Resolved Partial Discharge (PRPD) dengan Heatscatter akan digunakan untuk menginterpretasikan karakteristik PD yang dihasilkan. Dari hasil eksperimen, Pada pengujian insulation resistance (IR) tes menggunakan megger didapati bahwa semakin besar volume defect pada stator bar, maka nilai polarization index (PI), dielectric absorption ratio (DAR), dan nilai resistansi isolator semakin menurun. Nilai PDIV pada variasi cacat memiliki nilai yang berbeda. Semakin besar volume defect maka nilai inception voltage akan semakin rendah. Semakin tinggi tegangan injek maka jumlah pulsa PD dan peak magnitude juga akan semakin besar. Namun, sudut fasa dari peak magnitude akan semakin rendah atau mengalami pergeseran fasa ke kiri. Pola PD yang dihasilkan dari semua variasi internal discharge ini memiliki pola yang simetri pada siklus positif maupun siklus negatifnya. Penelitian ini dapat dijadikan sebagai langkah investigasi pada pemeliharaan generator serta sebagai acuan pada penelitian selanjutnya.
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Insulation of the generator stator windings is an important aspect that affects the operating reliability and life of the generator. This research focuses on the partial discharge (PD) characteristics due to internal defects in generator stator bar insulation. Tests were conducted by injecting AC voltage on the generator stator bar. This voltage was varied based on inception voltage, 4 kV, and 6.6 kV to see the effect of voltage magnitude on PD pattern and distribution. In addition to voltage variations, the stator bar is also varied based on internal stator insulation defects with a certain volume to see the effect of volume on the severity of insulation and PD pulse distribution patterns. The defects that will be varied are small voids, large voids, delamination, multi-voids, and a combination of delamination with multi-voids. The PD signal will be captured using a High Frequency Current Transformer (HFCT) and then stored and displayed on an oscilloscope. Phase Resolved Partial Discharge (PRPD) method with Heatscatter will be used to interpret the resulting PD characteristics. From the experimental results, the insulation resistance (IR) test using megger found that the larger the defect volume on the stator bar, the polarization index (PI), dielectric absorption ratio (DAR), and insulator resistance values decrease. The PDIV value in the defect variation has a different value. The larger the defect volume, the lower the inception voltage value. The higher the inception voltage, the greater the number of PD pulses and peak magnitude. However, the phase angle of the peak magnitude will be lower or have a phase shift to the left. The PD pattern generated from all internal discharge variations has a symmetry pattern in the positive cycle and negative cycle. This research can be used as an investigative step in generator maintenance and as a reference for further research.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Partial Discharge, Void, Delaminasi, Cacat Isolasi, Pola PD, PRPD, Partial Discharge, Delamination, Insulation defect, Stator Bar, PD Pattern
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK201 Electric Power Transmission T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1322.6 Electric power-plants T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK152.A75 Electrical engineering--Safety measures
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Defazh Mahardhika
Date Deposited:	29 Jul 2024 04:13
Last Modified:	29 Jul 2024 04:13
URI:	http://repository.its.ac.id/id/eprint/109652

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