scholarly journals ROOT CAUSE ANALYSIS OF MARINE COLLISION ACCIDENTS BY USING FAULT TREE METHOD

2021 ◽  
Author(s):  
Ali TÖZ ◽  
Müge BÜBER ◽  
Burak KÖSEOĞLU ◽  
Cenk ŞAKAR
Keyword(s):  
Fault Tree ◽  
Root Cause Analysis ◽  
Cause Analysis ◽  
Root Cause ◽  
Tree Method

Fault Tree-Based Root Cause Analysis Used to Study Mal-Operation of a Protective Relay in a Smart Grid

2022 ◽  
pp. 348-367
Author(s):  
Hamid Bentarzi
Keyword(s):  
Digital Filters ◽  
Fault Tree ◽  
Root Cause Analysis ◽  
Mitigation Measures ◽  
Cause Analysis ◽  
Root Cause ◽  
Protective Relay ◽  
Protective Relays ◽  
The Impact ◽  
Overall Reliability

This chapter presents how root cause analysis based on fault tree technique can be used to study mal-operation of protective relay in a smart power grid. This approach is used to identify disturbances first and root cause of mal operation of protective relays which may lead to unnecessary tripping and hence to blackout. Once the critical root causes are identified, mitigation measures first such as blocking protection functions and digital filters may be used in view of increasing the reliability of the considered protection system. The proposed approach has many advantages as it allows obtaining an important quantitative figure (security). These permits to strongly strengthen the elements of the protecting system which are most likely appropriate to failure and hence the impact on the overall system's cost is significant. Another main advantage is that it takes into account the reliability of the software part of the system which is considered to have a significant contribution in the overall reliability of the protecting system.

scholarly journals Analisa dan Evaluasi : Akar Penyebab dan Biaya Sisa Material Konstruksi Proyek Pembangunan Kantor Kelurahan di Kota Solo, Sekolah, dan Pasar Menggunakan Root Cause Analysis (RCA) dan Fault Tree Analysis (FTA)

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Kristanto Wibowo ◽  
Sugiyarto Sugiyarto ◽  
Setiono Setiono
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Root Cause Analysis ◽  
Cause Analysis ◽  
Tree Analysis ◽  
Root Cause

<p>Sisa material merupakan hasil sisa yang pasti muncul dalam sebuah proyek konstruksi berupa bahan atau material yang sudah tidak dapat difungsikan sebagaimana fungsinya dalam perencanaan dan berpeluang besar merugikan kontraktor apabila tidak dimanajemen dengan benar. Kerugian kontraktor yang dimaksudkan, salah satunya adalah membengkaknya biaya pelaksanaan proyek konstruksi. <em>Root Cause Analysis (RCA)</em> merupakan suatu metode analisis yang dipakai untuk menentukan penyebab utama suatu permasalahan dengan mengidentifikasi masalah paling umum atau paling terlihat kepada persoalan khusus yang merupakan akar dari masalah tersebut. <em>Fault Tree Analysis (FTA) </em>merupakan suatu metode analisis yang dipakai untuk menentukan seberapa berpengaruh penyebab-penyebab persoalan yang ada menyebabkan suatu kejadian penting ‘<em>top event</em>’ dalam satuan persen, menggunakan bantuan diagram ilustrasi berbentuk seperti cabang-cabang pohon, dan dihitung dengan rumus-rumus tertentu. Hasil analisa didapat jenis material yang paling banyak menjadi sisa material adalah besi dan genting keramik dengan persentase biaya sisa material berkisar dari 12,40 % - 14,50 %. Solusi untuk mengurangi sisa material antara lain : memberikan arahan kepada tenaga kerja agar lebih berhati-hati, dan menggunakan pekerja pembesian yang lebih efisien serta berpengalaman.<strong></strong></p>

scholarly journals Identifikasi Kegagalan Moving Bridge System Dermaga Penyeberangan Roro Air Putih Kabupaten Bengkalis

Kapal ◽  
2017 ◽  
Vol 14 (2) ◽  
pp. 40
Author(s):  
Edy Haryanto
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Root Cause Analysis ◽  
Cause Analysis ◽  
Tree Analysis ◽  
Root Cause ◽  
Bridge System

Moving Bridge (MB) pada dermaga penyeberangan roro Air Putih Bengkalis yang berfungsi sebagai pengatur ketinggian car deck kapal tidak berfungsi dengan baik. Disaat air pasang surut dan naik, moving bridge tidak dapat mengatur ketinggian  untuk memudahkan keluar masuknya kendaraan, hal ini dapat menyebabkan kendaraan menubruk atau sangkut sehingga membuat kendaraan tersebut rusak dan bisa membahayakan keselamatan. Berdasarkan situasi yang ada, root cause analysis berguna untuk mencari akar permasalahan sehingga kerugian dapat diminimalkan. Penelitian ini bertujuan untuk mengetahui basic event komponen kritis. Dengan menggunakan metode Fault Tree Analysis dapat diketahui penyebab kerusakan sistem. Hasil penelitian menunjukkan bahwa terdapat 14 bentuk kegagalan fungsi peralatan hidrolik di demaga. penyebab terbesar kegagalan moving bridge sistem hidrolik ini terdapat pada komponen konduktor yakni berupa saluran pipa dan selang dengan nilai keandalan komponen 71.43 %, penyebab yang kedua adalah pada strainer dengan nilai keandalan sebesar 28.57 %, sedangkan yang terkecil adalah pada komponen pompa dengan nilai keandalan sebesar 92.86 %. Untuk mengantisipasi kegagalan maka diperlukan kegiatan perawatan pencegahan seperti jadwal perawatan berkala, pengecekan sistem sebelum operasi, melindungi komponen dari pengaruh luar,  pelumasan dan menjaga kebersihan.

Fault Tree-Based Root Cause Analysis Used to Study Mal-Operation of a Protective Relay in a Smart Grid

2021 ◽  
pp. 289-308
Author(s):  
Hamid Bentarzi
Keyword(s):  
Digital Filters ◽  
Fault Tree ◽  
Root Cause Analysis ◽  
Mitigation Measures ◽  
Cause Analysis ◽  
Root Cause ◽  
Protective Relay ◽  
Protective Relays ◽  
The Impact ◽  
Overall Reliability

This chapter presents how root cause analysis based on fault tree technique can be used to study mal-operation of protective relay in a smart power grid. This approach is used to identify disturbances first and root cause of mal operation of protective relays which may lead to unnecessary tripping and hence to blackout. Once the critical root causes are identified, mitigation measures first such as blocking protection functions and digital filters may be used in view of increasing the reliability of the considered protection system. The proposed approach has many advantages as it allows obtaining an important quantitative figure (security). These permits to strongly strengthen the elements of the protecting system which are most likely appropriate to failure and hence the impact on the overall system's cost is significant. Another main advantage is that it takes into account the reliability of the software part of the system which is considered to have a significant contribution in the overall reliability of the protecting system.

Root Cause analysis of SG tube ODSCC indications within the tube sheets of NPP biblis unit A

2011 ◽  
pp. 78-86
Author(s):  
R. Kilian ◽  
J. Beck ◽  
H. Lang ◽  
V. Schneider ◽  
T. Schönherr ◽  
...  
Keyword(s):  
Root Cause Analysis ◽  
Cause Analysis ◽  
Root Cause

Rule Construction and its Execution for Root Cause Analysis

2012 ◽  
Vol 132 (10) ◽  
pp. 1689-1697
Author(s):  
Yutaka Kudo ◽  
Tomohiro Morimura ◽  
Kiminori Sugauchi ◽  
Tetsuya Masuishi ◽  
Norihisa Komoda
Keyword(s):  
Root Cause Analysis ◽  
Cause Analysis ◽  
Root Cause

Root Cause Analysis Techniques Using Picosecond Time Resolved LADA

2014 ◽  
Author(s):  
Dan Bodoh ◽  
Kent Erington ◽  
Kris Dickson ◽  
George Lange ◽  
Carey Wu ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Picosecond Laser ◽  
Root Cause Analysis ◽  
Fault Isolation ◽  
Time Resolved ◽  
Cause Analysis ◽  
Root Cause ◽  
Design And Manufacturing ◽  
Multiple Interactions ◽  
Established Technique

Abstract Laser-assisted device alteration (LADA) is an established technique used to identify critical speed paths in integrated circuits. LADA can reveal the physical location of a speed path, but not the timing of the speed path. This paper describes the root cause analysis benefits of 1064nm time resolved LADA (TR-LADA) with a picosecond laser. It shows several examples of how picosecond TR-LADA has complemented the existing fault isolation toolset and has allowed for quicker resolution of design and manufacturing issues. The paper explains how TR-LADA increases the LADA localization resolution by eliminating the well interaction, provides the timing of the event detected by LADA, indicates the propagation direction of the critical signals detected by LADA, allows the analyst to infer the logic values of the critical signals, and separates multiple interactions occurring at the same site for better understanding of the critical signals.

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