Experimental Study of the Leakage Current in Coated Insulators Under Salt-Fog Conditions

2019 ◽  
Vol 2 (3) ◽  
pp. 2
Author(s):  
Hugo Linhares Dias Espinola ◽  
Ivan José da Silva Lopes
Keyword(s):  
Experimental Study ◽  
Leakage Current ◽  
Preventive Measures ◽  
Harmonic Distortion ◽  
Relevant Information ◽  
Timely Manner ◽  
Hydrophobic Coatings ◽  
Glass Insulator ◽  
Salt Fog ◽  
Insulation Condition

The accumulation of contaminants in electrical insulators reduce their performance and may lead to failures. Estimating the degree of pollution of in-service equipment is not a trivial task as the process of contamination depends on several factors. It is necessary to monitor the insulators so that preventive measures can be taken in a timely manner. In this context, this paper aims to study how the amplitude, angular phase and total harmonic distortion (THD) of the leakage current can be used to monitor insulators and how these parameters are affected by the application of hydrophobic coatings. For this purpose, standard uncoated and coated glass insulator samples were subjected to electrical tests in a salt-fog chamber while the leakage current was monitored. The results show that the analyzed parameters provide relevant information about the insulation condition and how the application of hydrophobic coatings results in improvements in the insulator performance.

Nowcasting global trade in goods and services

2020 ◽  
pp. 1-19
Author(s):  
Fernando Cantú-Bazaldúa
Keyword(s):  
Real Time ◽  
Relevant Information ◽  
Global Trade ◽  
Dynamic Factor ◽  
Timely Manner ◽  
Short Term ◽  
Dynamic Factor Models ◽  
Significant Information ◽  
Goods And Services ◽  
World Economic

World economic aggregates are compiled infrequently and released after considerable lags. There are, however, many potentially relevant series released in a timely manner and at a higher frequency that could provide significant information about the evolution of global aggregates. The challenge is then to extract the relevant information from this multitude of indicators and combine it to track the real-time evolution of the target variables. We develop a methodology based on dynamic factor models adapted for variables with heterogeneous frequencies, ragged ends and missing data. We apply this methodology to nowcast global trade in goods in goods and services. In addition to monitoring these variables in real time, this method can also be used to obtain short-term forecasts based on the most up-to-date values of the underlying indicators.

Is Parent Education Tool Effective in Improving Awareness among Parents of a Wheezing Child? A Pre-Experimental Study

2021 ◽  
Vol 8 (06) ◽  
pp. 298-301
Author(s):  
Keerthi K ◽  
Gireeshan V.K ◽  
Deepthi K
Keyword(s):  
Experimental Study ◽  
Parent Education ◽  
Childhood Asthma ◽  
Tertiary Care ◽  
Relevant Information ◽  
Dose Inhaler ◽  
Educational Tool ◽  
Tertiary Care Centre ◽  
Common Chronic Disease ◽  
Education Tool

BACKGROUND Asthma is a common chronic disease in childhood. Globally, more than 339 million people are estimated to have asthma. The prevalence of childhood asthma in India is about 6 %. Even though childhood asthma is highly prevalent, the knowledge level among parents / caregivers about the disease, its risk factors, prevention and management is poor. Currently, in India there are no national or state level bodies to provide relevant information about the disease. The rationale of this study is to create a parent education tool that will provide the necessary details about the disease and to check the effectiveness by assessing the improvement in knowledge about childhood asthma among parents of wheezers after implementation of this self-prepared educational tool through a structured teaching programme. METHODS A pre-test post-test pre-experimental study was conducted among parents of children admitted to paediatric ward and intensive care unit of a tertiary care centre in North Kerala. A self-prepared questionnaire was used to assess the knowledge of parents before intervention. Intervention was done using an educational tool prepared by the researcher with the aid of power point presentation and hands on training on technique of using metered dose inhaler. Effectiveness of the tool was assessed after 10 days of intervention using the same questionnaire. Statistical analysis of collected data was done using Statistical Package for the Social Sciences (SPSS) version 26. RESULTS 51 parents were included in the study. The scoring of questionnaire before and after educational intervention was done as poor (< 10 score), average (11 - 20 score) and good (21 - 31 score). The mean score before intervention was 9.98 (SD = 3.14) and after intervention the score became 17.73 (SD = 2.562), and the difference was statistically significant (P = 0.00). Mean score of the knowledge regarding treatment and prevention of asthma improved to 10.18 (SD = 2.133) from 4.29 (SD = 2.212). CONCLUSIONS A well-developed parent education tool is a requirement for minor adjustments needed in the lifestyle of a child with asthma, which ensures proper prevention and treatment. KEYWORDS Childhood Asthma, Wheezing Child, Parent Education, Asthma Education Tool, Asthma Awareness

scholarly journals Utilization of WhatsApp for sharing livestock related information: An Experimental Study

2017 ◽  
Vol 13 (01) ◽  
Author(s):  
Devesh Thakur ◽  
Mahesh Chander
Keyword(s):  
Experimental Study ◽  
Animal Health ◽  
Relevant Information ◽  
Himachal Pradesh ◽  
Animal Breeding ◽  
Multiple Forms ◽  
Related Information ◽  
Dairy Processing ◽  
Extension Agencies

The paper is based on the use of WhatsApp in sharing of livestock related information among the farmers. A WhatsApp group of randomly selected 96 farmers from eight different districts of the Himachal Pradesh, India was created under the study. In a period of six months, information was shared in multiple forms among the farmers. A total of 62 queries during six months to seek information and advice on various livestock related problems were posted by the farmers. Maximum number of queries pertained to animal health followed by animal breeding, feeding, government programmes and dairy processing .The livestock extension agencies have the opportunity to explore and develop relevant information which can be disseminated through WhatsApp to the farmers.

scholarly journals You Can’t See What You Can’t See: Experimental Evidence for How Much Relevant Information May Be Missed Due to Google’s Web Search Personalisation

2020 ◽  
Author(s):  
C Lai ◽  
Markus Luczak-Roesch
Keyword(s):  
Experimental Study ◽  
Public Sector ◽  
Web Search ◽  
Potential Problem ◽  
Knowledge Work ◽  
Relevant Information ◽  
Web Search Engine ◽  
Online Searches ◽  
Potential Impact ◽  
Web Research

© 2019, Springer Nature Switzerland AG. The influence of Web search personalisation on professional knowledge work is an understudied area. Here we investigate how public sector officials self-assess their dependency on the Google Web search engine, whether they are aware of the potential impact of algorithmic biases on their ability to retrieve all relevant information, and how much relevant information may actually be missed due to Web search personalisation. We find that the majority of participants in our experimental study are neither aware that there is a potential problem nor do they have a strategy to mitigate the risk of missing relevant information when performing online searches. Most significantly, we provide empirical evidence that up to$$20\%$$ of relevant information may be missed due to Web search personalisation. This work has significant implications for Web research by public sector professionals, who should be provided with training about the potential algorithmic biases that may affect their judgments and decision making, as well as clear guidelines how to minimise the risk of missing relevant information.

Study of Fault Self-Recovery and Seal Improvement for Centrifugal Compressor

2010 ◽  
Author(s):  
Weimin Wang ◽  
Jinji Gao ◽  
Yan Li ◽  
Shuangxi Li
Keyword(s):  
Experimental Study ◽  
Centrifugal Compressor ◽  
Thrust Bearing ◽  
Mechanical Performance ◽  
High Reliability ◽  
Relevant Information ◽  
Axial Displacement ◽  
Oil Film ◽  
Dry Gas Seal ◽  
Low Leakage

For centrifugal compressor, discharge or suction pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing which may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow through balance drum seal can seriously affect the efficiency of compressor. Summarizing the characteristic of axial displacement fault about centrifugal compressor and analyzing the mechanical performance of tilt pads thrust bearing, theory of axial displacement fault self-recovery is presented and realized through experimental study. The method presented in this paper monitors the stiffness of oil film and identifies the reason of axial displacement increasing. Also the low leakage feature of Dry-Gas-Seal (DGS), high reliability of labyrinth, and the feasibility of upgrading existing structure are taken into account at the same time to design a combined labyrinth-dry gas seal system on the balancing drum. Based on the combined seal system, a Fault Self-Recovering (FSR) mechanism for the fault of rotor axial displacement is introduced to assure the minimum oil film thickness was ensured in real time. The modern Computational Fluid Dynamics (CFD) and experimental study were used to validate this concept. The result and relevant information indicate that the method can realize axial displacement fault self-recovering effectively and the combined sealing system could improve the efficiency of the centrifugal compressor about four percent.

Partial Discharge Characterization based on Leakage Current Pulses Waveform for Contaminated Glass Insulator String

2016 ◽  
Vol 6 (2) ◽  
pp. 835
Author(s):  
N. A. Othman ◽  
M. A. M. Piah ◽  
Z. Adzis ◽  
Nasir A. Al-geelani
Keyword(s):  
Corona Discharge ◽  
Monitoring System ◽  
Leakage Current ◽  
Partial Discharge ◽  
Surface Discharge ◽  
Performance Tests ◽  
Current Pulses ◽  
Glass Insulator

This paper deals with the analysis of partial discharge (PD) occurrences based on leakage current (LC) pulses distribution under different level of contamination. In this work, laboratory based contamination performance tests are conducted on four units of glass insulator string stacked in I-position. Results show that PD can be characterized (according to their occurrence with respect to the AC supply) as follows: corona discharge occurring dominantly in lightly contaminated insulators, surface discharge occurring dominantly in medium contaminated insulators and finally internal discharge occurring dominantly in heavily contaminated insulators. The ability to distinguish the type of PDs from the LC waveform could be used to monitor and predict the condition of the insulator. The outcome can be incorporated in a conditioning monitoring system.

An experimental study on the transformer coil leakage current

2006 ◽  
Vol 16 (3) ◽  
pp. 261-276
Author(s):  
Mohamed A. A. Wahab ◽  
M. M. Hamada ◽  
A. G. Zeitoun ◽  
G. Ismail
Keyword(s):  
Experimental Study ◽  
Leakage Current
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