condition monitoring of circuit breakers

... Condition Monitoring of Circuit Breakers INTERRUPTER DESIGN Breaker Operation Internal Details of Interrupter Typical Operating Links CB Operating ... Variations of Resistance values at the time of Arcing and main contact close/ trip Insertion of Arcing contact Insertion of Main Contact Contact travel Resistance during closed conditions ... inspection of CBs could help in rectification of CBs and hence avoiding major failures Conclusion    DCRM Test (non-invasive diagnosis) for CBs proved useful in indicating condition of main/...

Ngày tải lên: 01/03/2016, 22:22

... Background l Comparison of DC to AC Characteristics in Overcurrent Trip Units Comparison of DC to AC Ratings of Low Voltage Circuit Breakers l Field Testing of Low Voltage Circuit Breakers for DC Applications ... 1, Part 1, Circuit Breaker Maintenance, Low-Voltage Circuit Breakers, ABB K-Line Models, August 1992 EPRI NP-7410, Volume 1, Part 2, Circuit Breaker Maintenance, Low-Voltage Circuit Breakers, ... Inspection and Preventive Maintenance of Molded Case Circuit Breakers Used in Commercial and Industrial Applications 13 UL 489, Molded-Case Circuit Breakers and Circuit- Breaker Enclosures, 1988 Edition...

Ngày tải lên: 06/11/2019, 11:06

... degree of condition monitoring to enhance availability and plant safety Often, one such monitoring technique is vibration based, that is, decisions regarding the repair or replacement of a machine ... part, overhauls, and standard maintenance are made on the basis of the measured condition of the machine Proper machine condition monitoring procedures can result in lower maintenance costs and ... promise for the future of wireless smart vibration measurement based condition monitoring which are much cheaper alternatives It has a built-in signal conditioning unit The cost of MEMS accelerometer...

Ngày tải lên: 19/03/2023, 15:43

... http://respiratory-research.com/content/8/1/78 Page 2 of 11 (page number not for citation purposes) Today there are no established methods of direct continu- ous monitoring of the epithelial lining fluid of the lower respiratory ... for the diffusion of FD-4. The accuracy of bronchial microdialysis with a continuous FD-4 infusion was mean 0.09 ± 0.03 with a coefficient of variation of 65.2%. The accuracy of bronchial microdialy- ... a coefficient of variation of 54.8%. The reduction in the coefficient of variation was less than expected. Previ- ous knowledge of FD-4 analyses on the Fluoroskan II is Accuracy of bronchial microdialysis...

Ngày tải lên: 12/08/2014, 15:21

... mixed medico-surgical facility of 32 beds with a rate of admissions of approxi- mately 2,600 patients per year. The study was aimed at following the natural PK profiles of cefepime in ICU adult patients, ... Cr and the steepness of the slope of elimination of cefepime from the plasma (that is, the terminal slope of cefepime clearance, or K β , which follows the steeper slope of initial rapid drug ... according to the standard MIC cut-off values (Table 1) [7]. Cefepime PK profiles Seventeen first-dose and 11 steady-state PK profiles were determined, among which both profiles were obtained in seven...

Ngày tải lên: 13/08/2014, 20:21

... anal- ysis of different types of inactivation libraries, the sensitivity of the screen improves with the comprehensiveness of mutant representation (as shown by comparison of the results of the screens ... named MGK (Monitoring of Gene Knockouts), for genome-wide identification of conditionally essential genes. MGK identified bacterial genes that are critical for fitness in the absence of aromatic ... method, named MGK (Monitoring of Gene Knockouts), for the rapid identification of genes that contribute to bacterial fitness in various selective conditions. MGK uses flanking sequences of inserted...

Ngày tải lên: 14/08/2014, 07:21

... biofilms [29], and RscB, another known regulator of growth during biofilm formation [30], are indeed overrepresented in 'biofilm' conditions but may also play a role in alterations of ... sented in the biofilm related conditions present in our compendium, but mainly during pH shifts [32]. Condition dependency of the regulatory modulesFigure 1 Condition dependency of the regulatory ... in the same conditions or act independently of each other in different conditions [6,7]. Bicluster strategies are well suited to map both the condition dependency and the modularity of the transcriptional...

Ngày tải lên: 14/08/2014, 21:20

... of TSSs with conditions can give insight into the utilization and organization of TF binding sites in core promoters. For this reason, we characterized the condition associations of the set of ... GC-poor profile [20]. With this analysis, we show that the GC content is not only characteristic of core promoter elements, but also of initiation patterns of tran- scription. Conservation of sequence ... curation of ESTs and is of a similar magnitude to our previous study [38]. Here, we continue the tradition of using ESTs for TSS identification, but with the goal of identifying all of the consistently...

Ngày tải lên: 14/08/2014, 21:20

... analyzing and monitoring the rapid transient of small amplitude of cutting force signal 1.3 Objectives and scope of work The aim of the study is to develop model- based tool condition monitoring ... Lab of NUS for their support and assistance. I am deeply indebted to Professor Jerry Fuh Ying Hsi, Professor Seah Kar Heng, Professor Rahman Mustafizur, Associate Professor Lee Kim Seng, Professor ... sections: 2.2 Tool condition monitoring system Firstly, commercial tool condition monitoring systems are introduced in this section Secondly, tool condition monitoring methods...

Ngày tải lên: 09/09/2015, 10:11

... wear of a cutter after a period of cutting Therefore, the tool wear of each cutter is measured after a period of cutting for a number of times using Olympic microscope. National University of ... is not achieved, regardless of the accuracy of the result 1.3 Objectives The purpose of a tool condition monitoring system (TCM) is primarily to provide tool condition information for ... Shirakashi et al., “Analytical prediction of flank wear of carbide tools in turning plain carbon steel. Part 2. Prediction of flank wear,” Bulletin of the Japan Society of Precision Engineering, vol. 23,...

Ngày tải lên: 09/09/2015, 10:14

... effect of substrate roughness and its moisture conditions on the development of early age shrinkage of a new concrete layer cast on top of old concrete substrate. In addition, the assessment of ... the issue of TZV for early age shrinkage monitoring, an improved image analysis technique capable of monitoring early age shrinkage strains with respect to the depth from the top surface of cementitious ... various underlying and influencing factors arising from the adoption of a specific size of specimen, duration of monitoring, exposure conditions, mixture properties (w/c ratios, aggregate volume,...

Ngày tải lên: 10/09/2015, 15:52

... ii TABLE OF CONTENTS Acknowledgements i Table of contents iii Summary vi Nomenclature viii List of Figures x List of Tables xi Chapter Introduction Chapter Review of Control Loop ... example 65 Figure 5.1: An example of a variance tradeoff curve 68 Figure 5.2: Variance tradeoff curve for example 72 Figure 5.3: Comparison of tradeoff curve obtained from exact G and identified ... mind, before any kind of restructuring of control system, is whether the new control strategy will offer significant benefits than the current strategy and if the extent of performance enhancement...

Ngày tải lên: 16/09/2015, 12:35

... influence the ability of a network to generalize: the size and efficiency of the training set; the architecture of the network; the physical complexity of the problem. Of these three factors, ... optimality conditions will hold at some α iff blow ≤ bup + 2τ (E.15) where τ is a positive tolerance parameter. Correspondingly, violation is defined at α if one of the following sets of conditions ... function K ( x i , x j ) . The mapping of ϕ( x ) from X is implicit, which is not proportional to the number of the dimension of ϕ( x ) . Thus, the use of the kernel functions makes it possible...

Ngày tải lên: 16/09/2015, 17:13

... the quality and precision of the product The idea of continuous tool condition monitoring is to monitor the health condition of the tool at each time step in terms of a continuous metric based ... maintenance of the machinery systems [1] As the name of condition based maintenance implies the decision of maintenance in this system is based on the condition and the subsystem performing the condition ... is based on the condition and the subsystem performing the condition monitoring is usually named tool condition monitoring (TCM) in the literature This subsystem is responsible of assessing the...

Ngày tải lên: 08/09/2015, 18:19

... ADAPTIVE FAULT DETECTION AND CONDITION MONITORING OF INDUCTION MOTOR LU WENJING (B.ENG NUS) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING ... research area of condition monitoring and fault diagnosis of induction motor [2]-[4] Various techniques utilized differ from each other in terms of the following four aspects: 1) Choice of measurement ... operating conditions because of the dependency of motor fault feature on the operating condition Most of the papers limit their scopes to specific motor fault detection under one constant operating condition...

Ngày tải lên: 26/09/2015, 10:59

... LIST OF TABLES Table 1.1: Summary of percentage of each of the failure mode Table 1.2: Fault statistics on surveyed articles (*MC denotes Most Common fault) Table 1.3: Percentage of each of ... classification of vibration signatures result summary 88 Table 6.1: Similarity measures of same-indexed pair of machine current IMFs at 20Hz 98 Table 6.2: Similarity measures of same-indexed pair of machine ... strategy for M-SVM P: number of pole-pairs P0: average air-gap permeance r: distance between the centre of rotation and the centre of gravity of the rotor Rr: resistance of rotor phase winding s:...

Ngày tải lên: 03/10/2015, 21:57

... LIST OF TABLES Table 1.1: Summary of percentage of each of the failure mode Table 1.2: Fault statistics on surveyed articles (*MC denotes Most Common fault) Table 1.3: Percentage of each of ... classification of vibration signatures result summary 88 Table 6.1: Similarity measures of same-indexed pair of machine current IMFs at 20Hz 98 Table 6.2: Similarity measures of same-indexed pair of machine ... strategy for M-SVM P: number of pole-pairs P0: average air-gap permeance r: distance between the centre of rotation and the centre of gravity of the rotor Rr: resistance of rotor phase winding s:...

Ngày tải lên: 04/10/2015, 07:58

... variations of cutting conditions Hence, cutting tests were conducted at different conditions to evaluate the performance of the proposed method Table 15.1 shows the tool parameters and cutting conditions ... capture important features of the sensor signal that are sensitive to the change of process condition (such as tool wear) but are insensitive to the variation of process working condition and various ... Equation 15.37, the RMS of continuous AE signal is proportional to vc ap, tool flank wear VB, but it is independent of feed rate For the purpose of eliminating the effects of cutting conditions on features,...

Ngày tải lên: 23/01/2014, 01:20

... the geometry of combustion chamber of IDI Diesel Engine – Combustion, Emissions and Condition Monitoring Figure a Mesh of the Lister 8.1 indirect injection diesel engine; b Top view of the mesh; ... showed that split injections take care of reducing of PM without increasing of NOx level As mentioned, the effect of split injection on combustion and emission of DI Diesel engines has been widely ... sides of cylinder wall This leads to the formation of the two eddies occupying each one-half of the main chamber and staying centered with respect to the two half of the bowl The start of the...

Ngày tải lên: 08/03/2014, 19:20

... detect many aspects of the phenology of vegetation, such as date of onset of new vegetation growth, rate of greening up, date of maximum greenness, onset of senescence and length of growing season ... Appendix - Summary of results of Statistical Power Analysis 74 List of figures 1.1 Diagram to illustrate the trade-off between detail and coverage in monitoring programmes and the lack of intermediates ... soil phosphorus monitoring in view of need to reduce costs and lack of a generally accepted method Add dry deposition of sulphate and sulphur dioxide and total S deposition to list of measurements...

Ngày tải lên: 23/03/2014, 00:20