scholarly journals Load Impact Analysis Towards Power Loss in Distribution Substation in Wlingi District

2019 ◽  
Vol 1 (1) ◽  
pp. 27
Author(s):  
Tony Agus Setyawan ◽  
Yuni Rahmawati

This research aimed to find: (1) the distribution substations configuration in Kesamben Feeder, Wlingi District, (2) how much was the loading in those distribution substations, (3) how much load imbalance in the distribution substation’s load, and (4) how much was the power loss towards the imbalance load. This research used descriptive analysis by analyzing the loading imbalance towards the power loss of distribution substation in one feeder. The results showed that the higher percentage of loading imbalance meant higher power loss. However, although an imbalance percentage was more significant than a smaller percentage, the power loss that occurred might be more substantial due to the probable higher loading percentage so that the power loss in the substation was also influenced by the loading value, apart from the load imbalance.

2019 ◽  
Vol 4 (2) ◽  
pp. 91
Author(s):  
Kastana Sapanli ◽  
Tridoyo Kusumastanto ◽  
Sugeng Budiharsono ◽  
Agus Sadelie

Marine economy is an economic activity carried out in the sea and land areas whose activities are still related to marine resources. The marine sector is defined as seven sectors, namely: fisheries, marine tourism, mining, marine industry, sea transportation (marine transportation), marine building, marine services. This study used descriptive and impact analysis in the national Input-Output Table in 2010. The total output of the marine sector accounted for 27.39% of total national output. The GDP value in the marine sector is able to contribute 30.32% of the total national GDP. From the results of calculations regarding the analysis of the multiplier numbers by output, the formation of new output in the economy was 1.4087 units. Analysis of multiplier numbers by job opportunities causes an increase in employment opportunities by an average of 0.1451 units. The majority of the sectors of maritime tourism show high distribution power. The largest sub-sector with a sensitivity index value is the trade service sub-sector, which is 1.4608. Key words: descriptive analysis, impact analysis, marine economy, I-O table


2016 ◽  
Vol 35 (4) ◽  
pp. 417-423 ◽  
Author(s):  
Xiaofei Niu ◽  
Xiansong Liu ◽  
Xin Huang ◽  
Kai Huang ◽  
Yuqi Ma ◽  
...  

AbstractZn0.5Ni0.5-xCoxFe2-yLayO4 ferrites (with x=0, 0.02 and y=0, 0.02) were prepared by an industrial method using the standard ceramic technique and sintered at 1,250°C in air. X-ray diffraction (XRD) was used to obtain the phase formation of the NiZn ferrites. The microstructure of ferrites was investigated by scanning electron microscopy (SEM). The XRD reveals that lattice parameter (a) is decreased and a secondary phase (LaFeO3) is formed in the La–Co co-substituted NiZn ferrite sample, meanwhile, the grain size (D) of this sample decreased obviously by observing SEM photographs. Vibrating sample magnetometry (VSM), B-H analyzer, impedance analyzer and electrometer were carried out in order to characterize some properties of the ferrites. This investigation indicates that, La–Co co-substituted NiZn ferrite sample has higher power loss (Pcv) than other samples at low frequency with an increase in coercive field (Hc) and magnetocrystalline anisotropy (K1), a decrease in initial permeability (μi) and saturation magnetization (Ms). However, at high frequency, the power loss of La–Co co-substituted sample is low, which is attributed to high resistivity (ρ), small grain size (D), less number of Fe2+ ions and low porosity (P).


2017 ◽  
Vol 2 (1) ◽  
pp. 13-41
Author(s):  
Mursid Lubis ◽  
Yuzwar Z. Basri ◽  
Tatik Mariyanti

Privatization is one of the government’s programs in restructuring State-Owned Enterprises (SOEs). Other than restructuring SOE, privatization is also source of state budget funds (APBN). By privatizing SOE, government expected healthy corporation that will contribute larger tax payments, dividend payments, and additional paid-in capital. So it is expected that SOEs are always in a healthy condition, high competitive and produce goods quality products and services.In order to invite Islamic foreign investors. Now also available public listed SOEs that is according to Islamic sharia. SOE sharia shares are expected to be an example of implementing business in accordance to sharia, will benefit better financial performance and better share price. Eight SOEs who are members of the Jakarta Islamic Index, those are WSKT, WIKA, PTPP, SMGR, TLKM, PTBA, ANTM and PGAS, will be evaluated in this research regarding their financial performance and stock performance during the period 2000 to 2016.This research is included in descriptive research method that is ex post facto. The researcher evaluated the company's financial performance and stock performance during the 17-year period, from 2000 to 2016, financial performance measured is profitability performance (NPM, ROA and ROE), solvency (Total Asset Turnover) activity (Debt to Equity Ratio). The measurement of stock performance those are EPS. PER and PBV. Data analysis used in this research is descriptive analysis, trend analysis and Test t test.Based on the results of the study, the variable condition before the regression, NPM, ROA, ROE, DER, DR, DI, S / TA, EPS, PER and PBV variables have scattered residues normally. However, when tested for heteroscedasticity using scatter diagrams these variables such are NPM, ROA, ROE and PER free from heteroscedasticity. But variables such as DER, DR, DI, S/TA, EPS and PBV variables tend to contain heteroscedasticity. NPM variable data, tends to increase every year, as well as ROA, ROE. However, DER, DR, DI, S / TA, EPS, PER and PBV variables tend to be stable from year to year.Through a simultaneous equation method that reflects the existence of circular causation, it gives an idea of all variables being independent and dependent. Variable net profit margin on each SOE member JII, influenced significantly by the variable ROE, DER, DR, PER, PBV. The variable return on asset is influenced by ROE and DER variables significantly. The return on equity variable is significantly influenced by NPM, ROA, DER, PER and PBV variables. Debt To Equity Ratio (DER) variables are influenced significantly variables of NPM, ROA, ROE, DER, PER and PBV. Days Receivable (DR) variables influenced by NPM variables significantly.Days Inventory variables are not affected by any variable. Variable of Asset Turn Over (S / TA) is influenced by one variable only that is EPS. Variable Earning per Share (EPS) influenced significantly by variable DER and S / TA. Price Earning Ratio (PER) variables are significantly influenced by NPM, ROE, DER, and PBV. Price to Book Value (PBV) variables are significantly influenced by NPM, ROE, DER and PER variables.


Author(s):  
Lia Muliawaty

The main problem in this research is the effectiveness of the service of motor vehicle registration number at the offices of Single Administrative System Single Roof Pandeglang Banten Province low, allegedly caused by the coordination between each unit or part has not run optimally. The method used in this research is descriptive analysis by using path analysis (path analysis) that is by seeing how big influence and independent variable to dependent variable, either influence directly or indirect influence. With this design will be measured directly or indirectly the coordination influence expressed in 7 (seven) dimensions, namely the existence of agreement and unity of understanding, the existence of agreement on the activities, the existence of obedience, the exchange of information, the presence of coordinators who can lead, the existence of information from Various parties, and the mutual respect for the effectiveness of service at the Office of Pandeglang Area Manunggal One Roof Administration System of Banten Province.The results of the research can be found that the effectiveness of Motor Vehicle Tax Service is influenced by the coordination at the office of Pandeglang Area Manunggal One Roof Administration System of Banten Province, with the percentage is 98.0%. This means that the coordination is very dominant and decisive towards the increase of tax service on the Pandeglang Area Manunggal One Roof Administration System of Banten Province. However there are also other factors that are not examined (epsilon) but determine against the tax service on Pandeglang Area Manunggal One Roof Administration System of Banten Province of 2.0%.


2020 ◽  
Vol 15 (1) ◽  
pp. 242-249
Author(s):  
Basanta Pancha ◽  
Rajendra Shrestha ◽  
Ajay Kumar Jha

 The modern power distribution network is constantly being faced with an ever-growing load demand resulting into increased burden and reduced voltage, which leads to find alternative source of energy to meet it. In Nepal, the electricity supply is based on hydropower primarily, which are situated very far from load centers and hence the generated power are to be transmitted through transmission and distributed system. Among the systems, radial distribution system is popular because of low cost and simple design, but it has power quality issues like low voltage profile and higher loss. In response to the problem of increased load demand, efforts have been made to decentralize this infrastructure through the use of distributed generators. However, the improper sizing and placement of DG unit may lead to higher power loss and power instability. The optimization problem of DG unit placement and its capacity determination were performed in this research. The study has been carried out for Thimi-Sallaghari Feeder and this feeder has low voltage profile and higher power loss. The IEEE 33 bus test system was examined as a test case to demonstrate the effectiveness of the proposed approach. The study has been carried out in MATLAB using “Backward and Forward Sweep Method” for load flow analysis and Genetic Algorithm for optimization. The number of DG unit of different size integrated was varied from one to ten. The result of this study showed that the voltage at minimum voltage node, maximum active and reactive loss reduction of Thimi-Sallaghari feeder have been improved by 3.69% (from 0.942 p.u. to 0.976 p.u), 75.88 % and 75.88 % respectively with placement of DG units at three bus locations of total 658.2019 kW and 395.873 kVAR capacity. Likewise, the voltage at minimum voltage node, maximum active and reactive loss of IEEE- 33 bus system have been improved by 6.88 %, 90.11% and 89.9% respectively with placement of DG units of total 2215.488 kW and 1176.059 kVAR at 6 different locations of the network.  


2014 ◽  
Vol 620 ◽  
pp. 375-381 ◽  
Author(s):  
Jin Zhou Chen ◽  
Cun Yun Pan ◽  
Wen Min Li ◽  
Lei Zhang ◽  
Hu Chen

Compared with the conventional piston engines, the new rotary engine has many significant advantages, such as smaller volume and higher power density. Current studies at home and abroad are mainly focusing on aspects of its structural design, kinematics, dynamics analysis, except mechanical efficiency. In conventional piston engines, frictional loss of the piston group accounted for 65% of the total friction power loss[1]. In order to provide the scientific basis for designing low friction piston of the rotary engine, this paper combine the average two-dimensional Reynolds equation, the asperity contacts equation, viscosity-temperature equation and loads balance equation, proposing a method for calculating the friction power loss, and the applying the method to calculate the friction power loss of piston group of a new rotary engine.


2018 ◽  
Vol 5 (2) ◽  
pp. 310
Author(s):  
I Putu Gede Kartika ◽  
I Ketut Wijaya ◽  
I Made Mataram

Load imbalance will always occur in low voltage network systems (JTR), this is due to the uneven use of one phase load on customers coming from household elektrical appliances. The uneven use of loads will cause power losses in the network and drop in voltage. Load equalization on the network is one way to reduce power losses and voltage drop. This research was conducted by analyzing power losses and unbalanced load voltage drop and balanced load on the KL0005 transformer secondary distribution network on the Klungkung Feeder. Based on the result of the analysis, the power losses in the unbalanced load state obtained a result of 3.029 kW and the voltage drop in phase R was 6,1%, phase S was 3,5% and phase T was 0%, while the result of the power loss analysis balanced load obtained 2,9 kW and voltage drop in phase R is 2,6%, phasa S is 1,3% and phase T is 3% with difference in balanced load efficiency and unbalance load of 0,1%.


1981 ◽  
Vol 103 (3) ◽  
pp. 459-466
Author(s):  
D. F. Wilcock

Turbulence makes high speed conventionally designed bearings operate with higher power loss, higher temperature rise, and lower oil flow than would be predicted from conventional laminar analysis. The objective of this paper is to present a new concept for increasing the load/power efficiency of large thrust bearings by a hybrid design employing hydrostatic load support combined with hydrodynamic pads. Self-pressurization using a shaft-center feed to radial ducts in the runner provides reliability fully equal to conventional bearing-fed designs.


2021 ◽  
Vol 898 (1) ◽  
pp. 012007
Author(s):  
Hao Zhuang ◽  
Yashuai Jiang ◽  
Jing Wu ◽  
Xueliang Bai ◽  
Ronggang Gao ◽  
...  

Abstract High-density crystalline silicon modules have recently invoked large interest in PV industry due to its higher efficiency. However, high-density stacking of cells in this kind of module may have additional reliability problem, which might cause higher power loss during outdoor operation. Modules based on half-cut cells have been widely studied due to their higher power output compared with modules based on full cells. When a cell is half cut, its current level is half reduced. When it is 1/3 cut, its current level is decreased by 2/3. However, high-density modules based on 1/3-cut cells have rarely been studied. Therefore, in this work, damp heat (DH), thermal cycle (TC), UV irradiation and humidity freezing (HF) test were utilized to study the power degradation performance of these high-density modules fabricated with 1/3 cut cells. The obtained results show that these novel high-density modules with negative space between 1/3 cut cells have good reliability in various environmental conditions.


2021 ◽  
Vol 2 (4) ◽  
pp. 261-271
Author(s):  
Ali Sunandar ◽  
Kuncoro Bili Aszhari

In every construction project, there is always a change or what is commonly called a change order (CO). CO greatly affects the effectiveness of project work where its sustainability depends on three interrelated components namely quality, time and cost. The purpose of this study is to determine the causes, risks, impact of CO and risk management on costs. This research was conducted in the Bekasi area at the Tamansari Iswara project. This study uses descriptive analysis methods and direct interviews with the experts concerned by distributing questionnaires to 85 respondents and producing data for analysis. With the help of statistical analysis software that is SPSS researchers use several tests such as validity test, reliability test, descriptive analysis test, regression analysis, and risk analysis to determine the dominant variables and risk management. From the results of the analysis conducted there are 6 dominant variables namely X18, X19, X15, X28, X21, X9, X25, and the highest risk is found in variables X1 and X21.


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