Afanda, Muhammad Daniyal (2021) Analisis Transien Pada Kerusakan Generator Step-Up Transformer Di Unit 7 PLTU Paiton Akibat Gangguan Tanah Di Jaringan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Gangguan tanah atau ground fault merupakan salah satu gangguan yang dapat menginisiasi terjadinya fenomena transien. Fenomena transien inilah yang dapat menimbulkan kerusakan pada peralatan listrik seperti transformator. Saat terjadi transien peralatan-peralatan tersebut dapat mengalami kerusakan akibat tegangan lebih maupun tegangan yang berosilasi pada rentang frekuensi yang lebar. Penelitian ini akan menganalisis penyebab terjadinya kegagalan pada Generator Step-Up Transformer di Unit 7 PLTU Paiton dengan memperhatikan rekaman Digital Fault Recorder yang terpasang pada sistem. Untuk menguatkan analisis tersebut dilakukan juga simulasi terjadinya kegagalan pada perangkat lunak ATP-EMTP untuk mengetahui bentuk dan besaran tegangan transien pada terminal sisi tegangan tinggi transformator serta bentuk fouriernya. Setelah disimulasikan, tegangan transien yang terjadi menunjukkan osilasi yang tinggi sehingga memiliki tegangan puncak yang besar di beberapa ordo harmonisa fasa B. Besarnya tegangan puncak di beberapa ordo harmonisa tersebut menyebabkan rusaknya coil 27 & 28 pada belitan tegangan tinggi fasa B trafo karena melebihi nilai tegangan per coil yang diizinkan. Dari simulasi yang dilakukan didapatkan bahwa tegangan transien yang terjadi akibat gangguan tanah mengakibatkan rusaknya coil pada belitan salah satu fasa trafo karena ketidakmerataan tegangan pada belitan.
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Ground fault is one of the disturbances that can initiate the occurrence of transient phenomena. This transient phenomenon can cause damage to electrical equipment such as transformers. When the transient occurs, the equipment can be damaged due to overvoltage or oscillating voltage over the wide frequency range. This study will analyze the failure of the Generator Step-Up Transformer at Unit 7 PLTU Paiton by observing the recording of the Digital Fault Recorder installed on the system. To clarify the analysis, a failure simulation was carried out in the ATP-EMTP software to determine the shape and magnitude of the transient voltage at the high-voltage side of the transformer and its fourier shape. After being simulated, the transient voltage that occurs shows high oscillations so that it has high peak voltage in several harmonic orders on phase B. The magnitude of the peak voltage during the transient causes damage to coils 27 & 28 in the high-voltage winding phase B of the transformer because it exceeds the allowable voltage per coil value. From the simulation, it was found that the transient voltage that occurs due to ground faults causes damage to the coil in the winding of one phase of the transformer because of non-uniform voltage distribution in the windings.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Resonance Overvoltage, Transient Phenomenon, Power Transformer, Ground Fault, Fenomena Transien, Transformator Daya, Gangguan Tanah |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2551 Electric transformers. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3226 Transients (Electricity). Electric power systems. Harmonics (Electric waves). |
| Divisions: | Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Daniyal Afanda |
| Date Deposited: | 14 Aug 2021 02:05 |
| Last Modified: | 11 Oct 2024 05:34 |
| URI: | http://repository.its.ac.id/id/eprint/86512 |
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