Analisis Karakteristik Partial Discharge Eksternal Pada Implementasi Stator Generator Tegangan Tinggi

Negara, Fatih Kanza (2024) Analisis Karakteristik Partial Discharge Eksternal Pada Implementasi Stator Generator Tegangan Tinggi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Stator generator menjadi penyebab kerusakan terbanyak yaitu lebih dari 35% dari seluruh komponen generator, menurut studi dari EPRI (Electric Power Research Institute). Hal tersebut menjadi urgensi sebab keandalan stator sangat penting karena merupakan komponen utama yang mensuplai tegangan. Salah satu proses preventive maintenance untuk mencegah kegagalan pada stator adalah melakukan uji partial discharge (PD). Pada studi ini dipelajari karakteristik resistansi isolasi serta PD eksternal pada stator uji dengan rating 6.6kV. Stator uji yang digunakan terdiri dari stator full dan stator bar hasil potongan bagian bar dari satu set stator phase to phase. Resistansi isolasi dan PD eksternal yang diuji berupa surface discharge, corona discharge, dan slot discharge yang dibedakan dengan pengondisian kerusakan pada stator yang merupakan variasi pada pengujian ini. Pengujian dilakukan dengan tegangan tinggi AC yang bervariasi tergantung nilai PDIV (Partial Discharge Inceptionn Voltage), yaitu nilai pertama kali PD terdeteksi. Pengukuran resistansi isolasi pada studi ini menggunakan High Voltage Insulation Tester (Megger) dengan metode PI (Polarization Index) dan DAR (Dielectric Absorption Ratio) sedangkan proses deteksi PD menggunakan High Frequency Current Transformer dan diakuisi dengan Osiloskop digital serta Matlab. Data hasil osiloskop diolah menjadi pola PRPD menggunakan matlab untuk dianalisa sebaran PD pada tiap distribusi fasa dan besaran magnitude PD tiap kerusakan. Hasil pengujian menunjukan bahwa nilai resistansi isolasi jenis PD slot discharge berada pada nilai paling rendah, diikuti PD corona discharge, dan PD surface discharge. Hasil pengujian PDIV menunjukkan bahwa nilai PDIV terkecil didapat pada variasi defect slot, diikuti defect corona, dan defect surface. Pada pengujian PRPD, setiap variasi PD eksternal memiliki karakteristik masing – masing yang berbeda ditinjau dari distribusi PD, fasa peak magnitude, serta bentuk pola PRPD. Hasil pada penelitian ini dapat berkontribusi sebagai acuan dalam rancangan prosedur pengujian PD pada stator serta sebagai acuan dalam identifikasi awal penyebab kerusakan stator generator.
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According to a study from the Electric Power Research Institute (EPRI), generator stators cause the greatest damage to more than 35% of all generator components. This is an urgent issue because the reliability of the stator is very important because it is the main component that supplies the voltage. One of the preventive maintenance processes for preventing failure in the stator is to conduct a partial discharge (PD) test. In this study, the characteristics of the insulation resistance and external PD of a test stator with a rating of 6.6 kV were studied. The test stator consisted of a full stator and a stator bar cut from a set of phase-to-phase stators. The insulation resistance and external PD tested in the form of surface discharge, corona discharge, and slot discharge are differentiated by the conditioning damage to the stator, which is a variation in this test. The test is performed with an AC high voltage that varies depending on the partial discharge inception voltage (PDIV), which is the value at which the PD is first detected. The insulation resistance measurement in this study uses a high-voltage insulation tester (Megger) with PI (Polarization Index) and DAR (Dielectric Absorption Ratio) methods, whereas the PD detection process uses a high-frequency current transformer and is acquired with a digital Oscilloscope and Matlab. The oscilloscope data were processed into PRPD patterns using MATLAB to analyze the PD distribution in each phase and the PD magnitude of each damage. The test results show that the insulation resistance of the PD slot discharge type is at its lowest value, followed by the PD corona discharge and PD surface discharge. The PDIV test results showed that the smallest PDIV value was obtained in the slot defect variation, followed by corona and surface defects. In PRPD testing, each external PD variation had different characteristics in terms of PD distribution, peak magnitude phase, and PRPD pattern shape. The results of this study can serve as a reference for the design of PD testing procedures on the stator and for the initial identification of the cause of generator stator damage

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Partial Discharge, Stator, High Voltage Generator, Phase Resolved PD, Partial Discharge, Stator, Generator Tegangan Tinggi, Phase Resolved PD
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:	Fatih Kanza Negara
Date Deposited:	29 Jul 2024 08:39
Last Modified:	29 Jul 2024 08:39
URI:	http://repository.its.ac.id/id/eprint/109550

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