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Abstrak :
Metode Diagnosa Partial Discharge telah dipelajari lebih dari seratus tahun dan hingga sekarang metode diagnosa PD terus dikembangkan. Analisa Partial Discharge menjadi bagian penting didalam assessmen peralatan listrik, analisa partial discharge menentukan kondisi terkini dari peralatan listrik. Diagnosa data sinyal Partial Discharge menggunakan Metode Weibull terbukti tepat untuk mendiagnosa dan memisahkan sumber-sumber Partial Discharge yang berbeda, noise, dan gangguan (disturbances). Pengujian Goodness of Fit dilakukan dengan tujuan menentukan karakteristik distribusi data. Jenis data yang dipergunakan dalam studi ini adalah Distribusi Nilai Partial Discharge (Partial Discharge Height Distribution) yang diperoleh dari data pengukuran jurnal-jurnal Partial Discharge dan data pembimbing. Tujuan dari studi diagnosa ini adalah: menentukan akurasi dari prosedur diagnosa dengan membandingkan parameter statistik yang telah ada dengan hasil prosedur rancangan penulis, mengambil kesimpulan karakteristik sumber Partial Discharge dari nilai-nilai shape parameter dari beragam jurnal. Hasil akhir menyimpulkan bahwa parameter- parameter Weibull dapat menjelaskan karakter Partial Discharge dari sumber yang berbeda, sedangkan Pengujian Goodness of Fit belum dapat mendukung parameter-parameter Weibull untuk menjelaskan keragaman data distribusi. ......Partial discharge diagnosis methods have been studied for more than a century and until now its diagnosis method is still developing. Partial Discharge Analysis become an important part in electrical utility assessment, partial discharge analysis determine the actual condition of electrical utility. Partial Discharge signal data diagnosis using Weibull Method are proven proper to diagnose and separate among Partial Discharge origin sources, noises, and disturbances. Goodness of Fit Tests usage are practiced in order to determine characteristics of data distribution. Data type utilized in this study is Partial Discharge Height Distribution Data which acquired from Partial Discharge measurement data from journals and supervisor data. The purpose of this diagnosis study are : to determine diagnosis procedure accuracy by comparing existing statistical parameter result with the self-designed procedure, to take conclusion related to Partial Discharge source characteristics by shape parameter from various journals. Final results concludes that Weibull parameters are able to characterise Partial Discharge sources variety, while Goodness of Fit Tests have not yet been able to support the Weibull parameters to define data distributions variety.

Abstrak :
Fenomena partial discharge merupakan salah satu permasalahan dalam sebuah isolasi sistem tenaga listrik, bahkan termasuk salah satu indikator yang menentukan kegagalan isolasi. Fenomena ini terjadi karena adanya void atau celah-celah berkuran mikro yang diakibatkan kecacatan produksi maupun proses operasi. Partial discharge terjadi apabila beda potensial antar sisi pada void melebihi voltage breakdown pada medium perantara di dalam void. Terdapat tiga parameter yang diamati untuk mengetahui nilai suatu partial discharge yaitu PDI (Partial discharge Intensity) yang menunjukkan besarnya energi yang dilepaskan saat terjadi partial discharge dalam satuan mW, Qmax (magnitude of partial discharge) yang menunjukkan besarnya partial discharge dalam satuan mV, dan PPC (Pulse Per Cycle) yang menunjukkan banyaknya loncatan muatan yang terjadi dalam partial discharge dalam pulse per second. Sebuah penelitian dilakukan untuk menganalisis kondisi isolasi generator pada keadaan operasi tepat setelah proses minor overhaul generator unit 4 UBP Suralaya dimana terdapat penurunan nilai tekanan hidrogen dari kondisi idealnya (3 kg/cm2). Dalam kondisi tersebut, terindikasi kenaikan aktivitas partial discharge yang cukup signifikan yang menyebabkan penurunan kualitas isolasi serta peningkatan rugi daya. Pada penelitian ini, didapatkan nilai partial discharge yang tinggi pada lokasi sensor RTD7A, RTD10C dan RTD11B dan direkomendasikan untuk dilakukan inspeksi khusus pada lokasi-lokasi tersebut. Sangat direkomendasikan juga untuk membuat standar pengoperasian generator pada kondisi tekanan hidrogen yang ideal sesuai dengan desain generator.

Abstrak :
The book introduces the reader to the major components of a high voltage system and the different insulating materials applied in particular equipments. During a review of these materials, measurable properties suitable for condition assessment are identified. Analyses are included of some of the insulation fault scenarios that may occur in power equipment. The basic facilities for carrying out tests on the internal and external insulation structures at high and low voltages are described. Tests and measurements according to specifications, on-site requirements and research investigations are considered. Advances in the application of digital techniques for detection and analyses of partial discharges are discussed and methods in use, or under development, for service condition monitoring are described. These include the utilization of new sensors, the solution of online problems associated with noise rejection and the adaptation of artificial intelligence techniques for incipient fault diagnosis. The subject matter of the book is suitable for final year courses in electrical power engineering, short courses in insulation condition assessment and postgraduate programmes. Power system engineers associated with high voltage equipment should find the book of value in relation to fault investigations, maintenance requirements, insulation testing and condition monitoring.

Abstrak :
Condition monitoring of engineering plants has increased in importance as engineering processes are automated and manpower is reduced. However, electrical machinery receives attention only at infrequent intervals when plant is shut down and the application of protective relays to machines has also reduced operator surveillance. A first edition of Condition Monitoring of Electrical Machines, written by Tavner and Penman, was published in 1987. The economics of industry have now changed, as a result of the privatisation and deregulation of the energy industry, placing emphasis on the importance of reliable operation of plant, throughout the whole life cycle, regardless of first cost. The availability of advanced electronics and software in powerful instrumentation, computers, and digital signal processors (DSP) has simplified our ability to instrument and analyse machinery. As a result condition monitoring is now being applied to a wider range of systems from fault-tolerant drives of a few hundred watts in the aerospace industry, to machinery of a few hundred megawatts in major capital plant. In this new book the original authors have been joined by Ran, an expert in power electronics and control, and Sedding, an expert in the monitoring of electrical insulation systems. Together the authors have revised and expanded the earlier book, merging their own experience with that of machine analysts to bring it up to date.