scholarly journals Validation of S-parameter Power Cable Joint Model on Two Cable Defect Sections

2018 ◽  
Vol 12 (1) ◽  
pp. 282
Author(s):  
Tze Mei Kuan ◽  
Suhaila Sulaiman ◽  
Azrul Mohd. Ariffin ◽  
Mohd Amjad Ridzuan Radhi
Keyword(s):  
Time Domain Reflectometry ◽  
Experimental Results ◽  
Power Cable ◽  
Scattering Parameter ◽  
Cable System ◽  
Power Utility ◽  
Matlab Simulink ◽  
S Parameter ◽  
Utility Companies ◽  
Reflected Signal

<p>Electricity disruption due to power cable failure is a major challenge to power utility companies worldwide. A technique which provides quick response with accurate result is needed to detect defects along the cable to reduce the disruption time. This paper discusses the application of time domain reflectometry (TDR) technique to identify and locate the defect along a cable. A cable system is modelled in MATLAB/Simulink to replicate the cable configuration with two joints using the scattering parameter (S-parameter). This research studies the fault identification for two degraded sections in a cable by analyzing the reflected signal from the TDR technique. The characteristics of the reflected signal which indicates the defect cable section are discussed in detail in this paper. Results from MATLAB/Simulink simulations are also compared to the experimental results of the same cable configuration. This study shows that the signal reflection characteristics from MATLAB/Simulink simulations are similar to the experimental results. This indicates that the cable model system built using MATLAB/Simulink replicates the actual cable system accurately which can be used for further analysis of cable fault localization.</p>

scholarly journals Verification of MATLAB/Simulink Power Cable Modelling with Experimental Analysis

2018 ◽  
Vol 11 (2) ◽  
pp. 622
Author(s):  
Tze Mei Kuan ◽  
Suhaila Sulaiman ◽  
Azrul Mohd. Ariffin ◽  
Wan Mohamad Shakir Wan Shamsuddin
Keyword(s):  
Assessment Method ◽  
Time Domain Reflectometry ◽  
Experimental Results ◽  
Power Cable ◽  
Cable Model ◽  
Cable System ◽  
Matlab Simulink ◽  
Xlpe Cable ◽  
Frequent Exposure ◽  
Insulation Condition

Cross-linked polyethylene (XLPE) power cable is commonly used as the medium for transmitting power supply in the power system network. However, frequent exposure of XLPE cable to the high voltage causes its insulation to degrade over time leading to electricity outages. Degradation of cable can be prevented if regular maintenance is performed using the accurate assessment method. This study models and simulates a cable system comprising of three cable sections connected by two un-degraded cable joints. This model aims to assess defect along the tested cable with the application of time domain reflectometry (TDR) technique. A series of simulations are conducted by varying the cable insulation condition to study its influence on the cable joint reflection. These simulation results from MATLAB/Simulink are validated against the actual TDR experimental results. The identical results shown between the simulation and experimental results indicate that the cable model is valid and can be used to assess the condition of a cable.

scholarly journals Power Cable with Two Joints Experimental Analysis for Defect Assessments

2018 ◽  
Vol 12 (1) ◽  
pp. 399
Author(s):  
Tze Mei Kuan ◽  
Azrul Mohd. Ariffin
Keyword(s):  
Experimental Analysis ◽  
Time Domain Reflectometry ◽  
Power Cable ◽  
Power Utility ◽  
Utility Companies ◽  
Long Time ◽  
Stage 1 ◽  
Two Stages ◽  
Reflection Characteristics ◽  
Disruption Time

<span>Time domain reflectometry (TDR) is an easy technique that provides quick response which is ideal for power utility companies to conduct cable diagnostics on-site. Electricity disruption due to power cable failure is a major challenge for power utility companies due to the long length of cable installed with joints. The long time taken to diagnose the defect along the cable before electricity can be restored has not only jeopardized the reputation of power utility companies but also brings losses to the economy. Hence, this study conducts experimental analysis on cable with two joints with the application of TDR technique to reduce the electricity disruption time. This research is divided into two stages where stage 1 conducts experiments on cable with one degraded section while stage 2 looks into cable with two degraded sections. The TDR reflection characteristics are studied from stage 1 experiments and applied to stage 2 experiments to verify the consistency of the TDR reflection characteristics. The cable conditions of stage 2 experiments are predicted using the reflection characteristics from stage 1 observations and are then validated by comparing these predictions with the actual cable configuration. Results obtained from these experiments have proven that the TDR reflection characteristics are consistent and accurate which can be used to sectionalize the degraded cable section. Detail findings of all experiments conducted with the TDR application are discussed in part three of this paper.</span>

Partial Discharge Detection and Localization of Simulated Cable System

2015 ◽  
Vol 781 ◽  
pp. 337-340
Author(s):  
Cattareeya Suwanasri ◽  
Thanapong Suwanasri ◽  
Phanupong Fuangpian
Keyword(s):  
Partial Discharge ◽  
Standard Test ◽  
Time Domain Reflectometry ◽  
Measurement Tool ◽  
Power Cable ◽  
Cable System ◽  
Line Measurement ◽  
On Line ◽  
Detection And Localization ◽  
Discharge Detection

This paper presents the partial discharge detection and localization of degraded insulation within standard test objects and simulated power cable rated 6.2/7 kV. To verify a performance of on-line partial discharge diagnosis tool, the HFCT was used to compare with an off-line measurement tool based on IEC60270 standard. The Time Domain Reflectometry was also applied for partial discharge localization to identify partial discharge position of the simulated cable system in abnormal condition of insulation. The results show a good performance of on-line measurement tool. The methods for both partial discharge detection and localization are suitable for on-line condition monitoring. They can detect very small defects in the insulation, on time maintenance and repair, prevent failure and destruction, and prolong life expectancy of underground cable system.

Advanced Fault Isolation Technique Using Electro-Optical Terahertz Pulse Reflectometry (EOTPR) for 2D and 2.5D Flip-Chip Package

2012 ◽  
Author(s):  
Lihong Cao ◽  
Manasa Venkata ◽  
Meng Yeow Tay ◽  
Wen Qiu ◽  
J. Alton ◽  
...  
Keyword(s):  
Time Domain ◽  
Flip Chip ◽  
Time Domain Reflectometry ◽  
Fault Isolation ◽  
Experimental Results ◽  
Terahertz Pulse ◽  
Isolation And Identification ◽  
Isolation Technique ◽  
Non Destructive

Abstract Electro-optical terahertz pulse reflectometry (EOTPR) was introduced last year to isolate faults in advanced IC packages. The EOTPR system provides 10μm accuracy that can be used to non-destructively localize a package-level failure. In this paper, an EOTPR system is used for non-destructive fault isolation and identification for both 2D and 2.5D with TSV structure of flip-chip packages. The experimental results demonstrate higher accuracy of the EOTPR system in determining the distance to defect compared to the traditional time-domain reflectometry (TDR) systems.

Knowledge Management for Electric Power Utility Companies

2010 ◽  
pp. 97-122
Author(s):  
Campbell Booth
Keyword(s):  
Knowledge Management ◽  
Decision Support ◽  
Electric Power ◽  
Asset Management ◽  
Effective Practices ◽  
Power Utility ◽  
Utility Company ◽  
Utility Companies ◽  
Power Utilities ◽  
Behavioural Aspects

This chapter will present an overview of the challenges presented to modern power utility companies and how many organizations are facing particularly pressing problems with regards to an ageing workforce and a general shortage of skills; a situation that is anticipated to worsen in the future. It is proposed that knowledge management (KM) and decision support (DS) may contribute to a solution to these challenges. The chapter describes the end-to-end processes associated with KM and DS in a power utility context and attempts to provide guidance on effective practices for each stage of the described processes. An overview of one particular power utility company that has embraced KM is presented, and it is proposed that the function of asset management within power utilities in particular may benefit from KM. The chapter focuses not only on KM techniques and implementation, but, equally, if not more importantly, on the various cultural and behavioural aspects that are critical to the success of any KM/DS initiative.

scholarly journals Analysis of an application possibility of geopolymer materials as thermal backfill for underground power cable system

2020 ◽  
Author(s):  
Paweł Ocłoń ◽  
Piotr Cisek ◽  
Marcelina Matysiak
Keyword(s):  
Thermal Conductivity ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Power Cable ◽  
Closed Cycle ◽  
Cable System ◽  
Material Costs ◽  
Cable Systems ◽  
Underground Power Cable ◽  
By Products

Abstract The circular economy is a closed cycle that allows one to reuse the industrial waste, as well as minimize the energy and resources losses during the production process. This paper presents an innovative idea of the application of a geopolymer cable backfill for underground power cable system installation. The closed cycle, in this case, is formulated as follows: the primary resource is the waste from the combustion of fossil fuels, i.e., fly ash that is utilized to form the geopolymer matrix. The geopolymer then is used as thermal backfill in underground power cable systems. Utilization of combustion by-products in the form of a geopolymer is a highly profitable solution since landfill waste disposal, in this case, generates considerable costs for the electrical energy producers. In typical applications, geopolymers are used as insulators. By adding individual components, the thermal conductivity of 2.0 W/(m K), higher than of typical thermal backfills (Fluidized Thermal Backfill), which value is close to 1.5 W/(m K), is reached. What is very important, geopolymers can absorb water better than typical sand–cement mixtures. As a result, a high thermal conductivity with the temperature increase is maintained. The application of geopolymers as thermal backfills has the potential to improve the flexibility of underground power cable systems, as well as to minimize the material costs of installation. The case study is presented to show the economic benefits of using the combustion by-products as a geopolymer thermal backfill. The finite element method model of an underground power cable system is developed, and optimization of backfill dimensions is provided to minimize the material costs using the geopolymer thermal backfill and to maximize the underground power cable system performance. The main result of this paper is that the application of geopolymers leads to a decrease in underground power cable system costs, compared to traditional backfill (sand–cement mixture). The reason is the higher value of thermal conductivity, which allows selecting a cable with a smaller cross-sectional area. Also, the environmental benefits of geopolymer application for cable bedding are discussed. Graphic abstract

scholarly journals Applications of Landsat-8 Data: a Survey

2018 ◽  
Vol 7 (4.35) ◽  
pp. 436 ◽  
Author(s):  
M. A. Ridwan ◽  
N. A. M. Radzi ◽  
W. S. H. M. W. Ahmad ◽  
I. S. Mustafa ◽  
N. M. Din ◽  
...  
Keyword(s):  
Review Paper ◽  
Short Wave ◽  
Landsat 8 ◽  
Infrared Sensor ◽  
Power Utility ◽  
Spectral Bands ◽  
Utility Companies ◽  
Infrared Spectral ◽  
Thermal Region ◽  
To Come

Landsat 8 was launched in 2013 by the National Aeronautics and Space Administration (NASA). On board of the Landsat 8 is the Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS). Data for visible, panchromatic band, short-wave infrared spectral bands are collected by the OLI while TIRS collect images in the thermal region. As data for Landsat 8 is available to be used for public, researchers have utilized the data for numerous applications. However, to the best of our knowledge, there is yet a review paper on the various applications of Landsat 8 data. Hence, this paper presented an innovative survey on Landsat 8 data in the application of agriculture and forestry, land use and mapping, geology, hydrology, coastal resources and environmental monitoring. The potential of utilizing Landsat 8 data for power utility companies is also discussed in this paper. As Landsat 8 data is predicted to be available for more years to come, this paper provides insight for researchers to utilize the data better for their research. 

Research on Photovoltaic Industry with the MPPT Algorithm in PV System

2013 ◽  
Vol 345 ◽  
pp. 359-363
Author(s):  
Shi Die Shen ◽  
Wei Yao
Keyword(s):  
Duty Cycle ◽  
Boost Converter ◽  
Experimental Results ◽  
Pv System ◽  
Maximum Power Point ◽  
Matlab Simulink ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Variable Step ◽  
Power Point

In this paper, photovoltaic industry is introduced briefly. For the shortcomings of the fixed-step perturbation and observation (P&O) method in the maximum power point tracking (MPPT) technology, a variable-step P&O method is proposed and the algorithm is further improved. In the PV system, the MPPT is realized by changing the duty cycle of switching tube in the Boost converter. The simulations were conducted in the Matlab/Simulink platform. At last, the experimental results on the 3kw prototype showed that the new MPPT algorithm is effective.

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