Analisis Penyebab Vibrasi Abnormal Generator PLTG 4.1 PADA PT.PJB Unit Pembangkitan Muara Tawar
DOI:
https://doi.org/10.22441/jte.v10i2.008Abstrak
Pada PT. PJB Unit Pembangkitan Muara Tawar memiliki sistem pembangkit listrik PLTG (Pembangkit Listrik Tenaga Gas) mempunyai 2 komponen utama yaitu generator dan turbin. Turbin adalah suatu komponen yag merubah energi primer menjadi energi gerak. Generator adalah suatu komponen yang merubah energi gerak yang dihasilkan oleh turbin menjadi energi listrik. Pada PLTG menggunakan generator tiga phasa AC.Permasalahannya adalah ditemukan kondisi abnormal dimana pada saat menaikkan daya reaktif (MVAR) maka vibrasi pada generator ikut naik. untuk menjaga agar generator tidak terjadi kerusakan yang lebih fatal maka dilakukan thermal sensitivity test pada bulan oktober 2018. Dari hasil pengujian tersebut didapat kesimpulan. pada saat test dengan constant field current, vibrasi cenderung konstan. Sedangkan pada saat test dengan daya aktif konstan (base load), dengan variasi daya reaktif (increase-decrease) jika daya reaktif naik vibrasi juga ikut naik, dan sebaliknya jika daya reaktif diturunkan maka vibrasi juga ikut turunBerdasarkan hasil analisa dan beberapa pengujian berupa pengujian tahanan isolasi dengan nilai 4.42 GΩ,pengujian tahanan belitan dengan deviasi 0.167849%, pengujian impedansi rotor dengan nilai rata-rata 11.92 GΩ, pengujian RSO dan rotor ventilation di temukan ada 24 dari 2880 cooling hole rotor tertutup. Sehingga sirkulasi pendinginan pada rotor tidak merata. Tidak meratanya sirkulasi pendinginan sehingga distribusi panas di rotor tidak merata menyebabkan rotor bowing atau rotor membungkuk. Rotor bowing menyebabkan gaya axial dan gaya sentrifugal pada rotor tidak stabil sehingga terjadi peningkatan vibrasiUnduhan
Referensi
Report Siemens, “Generator Fact Finding Generator 4.1 Muara Tawar Generator Rotor Pole Balance Test”, Bekasi
Klemper, Geof and I. Kerszenbaum. “Handbook of Large Turbo-Generator Operation and Maintenance Second Edition”, California, 2008.
S. C. Bhuwana. “Turbo Generator Rotor and Stator Wedge Replacment Handbook”. Canada. 2008
R. J. Zawoysky and W. M. Genovese, “Generator Rotor Thermal Sensitivity—Theory and Experience”, GE Power System.
R. J. Zawoysky and T. C. Karl, “GE Generator Rotor Design, Operational Issues, and Refurbishment Options”, GE Power Systems Schenectady.
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