scholarly journals Providing safety at the presence of arc flash hazard risk in the high voltage equipment

2018 ◽  
Vol 2 (2) ◽  
pp. 40-45
Author(s):  
Marinela Yordanova Yordanova
Keyword(s):  
Electric Power ◽  
High Voltage ◽  
Special Section ◽  
Thermal Power ◽  
Health And Safety ◽  
International Standards ◽  
Power Lines ◽  
Electrical Safety ◽  
Power Stations ◽  
Arc Flash

The hazards of electric arcs in Bulgarian norms, as the Regulations on Health and Safety at work in electrical installations of electrical and thermal power stations and electric power lines and Ordinance №9 on the technical operation of power stations and electric power lines mainly govern the safety at work with high-voltage equipment, are not subject to a special section. NFPA 70E Standards for electrical safety in the Workplace requires to assess whether there are arc-dangers; to calculate the energy released by the arc; to define the permissible arc protection boundaries; to provide adequate personal protective equipment and to label the equipment. The aim of the paper is to summarize the Bulgarian requirements connected somehow with the flash hazard, to compares similarities can be found in approaches to ensuring electrical safety with those of international standards.

scholarly journals Wind: generating power and cooling the power lines

2020 ◽  
Vol 17 ◽  
pp. 105-108
Author(s):  
Marko Kaasik ◽  
Sander Mirme
Keyword(s):  
Wind Speed ◽  
Electric Power ◽  
High Voltage ◽  
Transmission Lines ◽  
Power Transmission ◽  
Mixed Forest ◽  
Wind Farms ◽  
Power Line ◽  
Power Lines ◽  
Local Wind

Abstract. The electric power that can be transmitted via high-voltage transmission lines is limited by the Joule heating of the conductors. In the case of coastal wind farms, the wind that produces power simultaneously contributes to the cooling of high-voltage overhead conductors. Ideally this would allow for increased power transmission or decreased dimensions and cost of the conductor wires. In this study we investigate how well the wind speed in coastal wind farms is correlated with wind along a 75 km long 330 kW power line towards inland. It is found that correlations between wind speed in coastal wind farms at turbine height and conductor-level (10 m) are remarkably lower (R=0.39–0.64) than between wind farms at distances up to 100 km from each other (R=0.76–0.97). Dense mixed forest surrounding the power line reduces both local wind speed and the correlations with coastal higher-level wind, thus making the cooling effect less reliable.

scholarly journals Shaping Frontline Practices: A Scoping Review of Human Factors Implicated in Electrical Safety Incidents

Safety ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 76
Author(s):  
Tristan W. Casey ◽  
Hannah M. Mason ◽  
Jasmine Huang ◽  
Richard C. Franklin
Keyword(s):  
Human Factors ◽  
Health And Safety ◽  
Electrical Safety ◽  
Search Terms ◽  
Dynamic Forces ◽  
Quality Checks ◽  
Arc Flash ◽  
Critical Appraisal Skills ◽  
The Individual ◽  
Appraisal Tool

Injuries sustained while performing electrical work are a significant threat to the health and safety of workers and occur frequently. In some jurisdictions, non-fatal serious incidents have increased in recent years. Although significant work has been carried out on electrical safety from a human factor perspective, reviews of this literature are sparse. Thus, the purpose of this review is to collate and summarize human factors implicated in electrical safety events. Articles were collected from three databases (Scopus, Web of Science, and Google Scholar), using the search terms: safety, electri*, human factors, and arc flash. Titles and abstracts were screened, full-text reviews were conducted, and 18 articles were included in the final review. Quality checks were undertaken using the Mixed Methods Appraisal Tool and the Critical Appraisal Skills Program. Environmental, individual, team, organizational, and macro factors were identified in the literature as factors which shape frontline electrical worker behavior, highlighting the complexity of injury prevention. The key contributions of this paper include: (1) a holistic and integrated summary of human factors implicated in electrical safety events, (2) the application of an established theoretical model to explain dynamic forces implicated in electrical safety incidents, and (3) several practical implications and recommendations to improve electrical safety. It is recommended that this framework is used to develop and test future interventions at the individual, team, organizational, and regulator level to mitigate risk and create meaningful and sustainable change in the electrical safety space.

Application of Weibull Distribution in Calculating Ground Deformation

2012 ◽  
Vol 256-259 ◽  
pp. 15-18
Author(s):  
Shi Bo Li ◽  
Hong Jian Lu
Keyword(s):  
Weibull Distribution ◽  
Electric Power ◽  
High Voltage ◽  
High Power ◽  
Underground Mining ◽  
Ground Deformation ◽  
Power Line ◽  
Power Lines ◽  
Ground Subsidence ◽  
Matlab Program

Weibull distribution was applied to calculate the ground subsidence and deflection value, in order to analysis accurately the influence of ground subsidence caused by underground mining on high voltage electric power lines. The results showed that the effect of reducing surface subsidence was notable and the high power line was working normally. It was accurate enough to calculate ground deformation by using Weibull distribution, and Matlab program can be used to solve the function feasibly.

Evaluation of Proximity Warning Devices for Cranes

1989 ◽  
Vol 6 (2) ◽  
Author(s):  
J. Derald Morgan
Keyword(s):  
Electric Field ◽  
Electric Power ◽  
High Voltage ◽  
Relative Position ◽  
Power Lines ◽  
Testing And Evaluation ◽  
Warning Device

Extensive testing and evaluation of the proximity warning device (PWD) have clearly shown that the concept of using the measurement of the electric field to determine the relative position of a crane with respect to power lines to be flawed. PWDs tested are not dependable as their warning is, in many cases, nonrepeatable and, in some instances, totally unreliable. The devices depend entirely on a measurement of |E| to detect and warn of proximity to high voltage electric power lines. However, the typical |E| configuration produced by the presence of high voltage electric lines is subject to many variables, including but not limited to

scholarly journals Automatic Extraction of High-Voltage Power Transmission Objects from UAV Lidar Point Clouds

2019 ◽  
Vol 11 (22) ◽  
pp. 2600 ◽  
Author(s):  
Ruizhuo Zhang ◽  
Bisheng Yang ◽  
Wen Xiao ◽  
Fuxun Liang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Electric Power ◽  
High Voltage ◽  
Point Cloud ◽  
Power Transmission ◽  
Point Clouds ◽  
3D Models ◽  
Noise Removal ◽  
Power Lines ◽  
Cloud Data ◽  
Communication Signal

Electric power transmission and maintenance is essential for the power industry. This paper proposes a method for the efficient extraction and classification of three-dimensional (3D) targets of electric power transmission facilities based on regularized grid characteristics computed from point cloud data acquired by unmanned aerial vehicles (UAVs). First, a special hashing matrix was constructed to store the point cloud after noise removal by a statistical method, which calculated the local distribution characteristics of the points within each sparse grid. Secondly, power lines were extracted by neighboring grids’ height similarity estimation and linear feature clustering. Thirdly, by analyzing features of the grid in the horizontal and vertical directions, the transmission towers in candidate tower areas were identified. The pylon center was then determined by a vertical slicing analysis. Finally, optimization was carried out, considering the topological relationship between the line segments and pylons to refine the extraction. Experimental results showed that the proposed method was able to efficiently obtain accurate coordinates of pylon and attachments in the massive point data and to produce a reliable segmentation with an overall precision of 97%. The optimized algorithm was capable of eliminating interference from isolated tall trees and communication signal poles. The 3D geo-information of high-voltage (HV) power lines, pylons, conductors thus extracted, and of further reconstructed 3D models can provide valuable foundations for UAV remote-sensing inspection and corridor safety maintenance.

ACTIVE SCREENING MAGNETIC FIELD SYSTEMS SYNTHESIS FOR SINGLE-CIRCUIT HIGH VOLTAGE POWER LINES WITH VERTICAL CONDUCTORS WITH SINGLE COMPENSATING COIL

2017 ◽  
Vol 25 (101) ◽  
pp. 402-408
Author(s):  
Boris B., Kobyljanskij ◽  
◽  
Valery V., Kolomiec ◽  
Boris I., Kuznetsov ◽  
Tatyana B., Nikitina ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Voltage ◽  
Power Lines ◽  
Active Screening ◽  
Field Systems ◽  
High Voltage Power Lines
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