Calculation of single event burnout failure rate for high voltage devices under satellite orbit without fitting parameters

2019 ◽  
Vol 100-101 ◽  
pp. 113396
Author(s):  
M. Sudo ◽  
T. Nagamatsu ◽  
M. Tsukuda ◽  
I. Omura
Keyword(s):  
Failure Rate ◽  
High Voltage ◽  
Satellite Orbit ◽  
Single Event ◽  
Fitting Parameters

Reducing failure rate at high voltage (HV) testing of insulator using Six Sigma methodology

2018 ◽  
Vol 67 (5) ◽  
pp. 791-808 ◽  
Author(s):  
Darshak A. Desai ◽  
Aurangzeb Javed Ahmed Shaikh
Keyword(s):  
Failure Rate ◽  
High Voltage ◽  
Six Sigma ◽  
Manufacturing Industry ◽  
Small Scale ◽  
Case Study Methodology ◽  
Content Type ◽  
Sigma Level ◽  
Ceramic Manufacturing

PurposeThis paper, a case study, aims to illustrate the application of Six Sigma in a small-scale ceramic manufacturing industry. The purpose of this paper is to demonstrate the empirical application of DMAIC methodology to reduce failure rate at high voltage (HV) testing of one of the most critical products, insulator.Design/methodology/approachThe case study is based on primary data collected from a real-life situation prevailing in the industry. The case study methodology adopted here is at one small-scale unit wherein the authors have applied DMAIC methodology and observed and recorded the improvement results, especially, reduction in failure rate at HV testing of insulator and, thus, increase in Sigma level.FindingsThe results found after implementation of the solutions are very significant. The rejection percentage has been reduced from 0.5 to 0.1 percent and consequently the Sigma level has been improved from 4.4 to 5.0.Research limitations/implicationsThis success story can be a guiding roadmap for other such industries to successfully implement Six Sigma to improve quality, productivity and profitability.Practical implicationsThis case study will serve as one of the resource bases for the industries which have till not implemented Six Sigma and benefited from the same.Social implicationsImproved quality and productivity leads to better economy. This case will help industries to serve the society with better economy with improved quality and productivity.Originality/valueThough ceramic industries in India are having enormous potential for growth, majority of them, especially, small and medium industries are either not aware of or not implementing Six Sigma to reap its multidimensional benefits of improving quality, productivity and profitability. This study highlights the benefits reaped by small-scale ceramic manufacturing industry opening up the avenues for its application at other such organizations.

LATERAL ARM FREE FLAPS IN THE DEFECTS OF THE UPPER EXTREMITY — A REVIEW OF 72 CASES

Hand Surgery ◽  
2005 ◽  
Vol 10 (02n03) ◽  
pp. 177-185 ◽  
Author(s):  
M. Akinci ◽  
Ş Ay ◽  
S. Kamiloglu ◽  
Ö. Erçetin
Keyword(s):  
Venous Thrombosis ◽  
Upper Extremity ◽  
Failure Rate ◽  
High Voltage ◽  
Free Flaps ◽  
Perforator Flaps ◽  
Operative Duration ◽  
Anastomosis Site ◽  
Extended Approach ◽  
Forearm Skin

Lateral arm flaps are versatile in the use of upper extremity moderate-sized defects with little morbidity and with acceptable cosmesis. The conditions are outlined in a series of 74 lateral arm flaps performed on 72 patients and the results are given. Five patients were operated on as emergencies, 12 were operated within the first 72 hours of injury and 57 patients were treated electively. Skin defects were between 6 × 4 cm and 20 × 9 cm . Five (7%) flaps were lost due to venous thrombosis, three that sustained a high-voltage electric burn. Two other patients that were treated for a high-voltage electric burn had a successful revision of the anastomosis site in the early post-operative duration. One flap was abandoned due to very thin pedicle and obesity of the patient. A higher failure rate is encountered most frequently with the cases of high-voltage electric burn. To deal with this problem, a modified approach such as an extended approach and/or including the forearm skin to the flap is recommended during the flap harvest. For a longer pedicle to be anatomized more proximally, perforator flaps with longer pedicles may be used as an alternative.

Assessment of surge arrester failure rate and application studies in Hellenic high voltage transmission lines

2010 ◽  
Vol 80 (2) ◽  
pp. 176-183 ◽  
Author(s):  
C.A. Christodoulou ◽  
L. Ekonomou ◽  
G.P. Fotis ◽  
I.F. Gonos ◽  
I.A. Stathopulos
Keyword(s):  
Failure Rate ◽  
High Voltage ◽  
Transmission Lines ◽  
High Voltage Transmission

scholarly journals Single-Event Burnout of SiC Junction Barrier Schottky Diode High-Voltage Power Devices

2018 ◽  
Vol 65 (1) ◽  
pp. 256-261 ◽  
Author(s):  
A. F. Witulski ◽  
R. Arslanbekov ◽  
A. Raman ◽  
R. D. Schrimpf ◽  
A. L. Sternberg ◽  
...  
Keyword(s):  
Schottky Diode ◽  
High Voltage ◽  
Single Event ◽  
Power Devices

scholarly journals Failure Rate and Economic Cost Analysis of Clamped-Single Submodule with DC Short Current Protection for High Voltage Direct Current System

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 993
Author(s):  
Yun-Gi Kwak ◽  
Feel-Soon Kang ◽  
Sung-Geun Song
Keyword(s):  
Failure Rate ◽  
High Voltage ◽  
Direct Current ◽  
Current System ◽  
Short Circuit ◽  
Fault Tree ◽  
Economic Cost ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Circuit Components

Clamped-single submodule (CSSM) has DC short circuit current protection function to improve the safety and stability of high voltage, direct current (HVDC) system. In order to carry out the protection, it needs an additional number of insulated gate bipolar transistors (IGBTs) and diodes compared to the conventional half-bridge submodule (HBSM). In general, the failure rate tends to increase in proportion to the number of circuit components. Also, complex operation of the submodule may increase the failure rate, so accurate reliability analysis considering these points is required to apply CSSM in a practical HVDC system. We estimate the failure rate and the mean time between failures (MTBF) of CSSM using a fault tree. Fault-tree analysis (FTA) is possible to analyze the failure rate more accurately than the prior part count failure analysis (PCA) that considers only the number of parts, the type of parts, and the connection status of each circuit component. To provide guidelines for submodule selection under various conditions, we compare the economic cost of a CSSM with HBSM, FBSM, and clamped-double submodule (CDSM), and analyze the failure rate according to the voltage margin of the parts.

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