scholarly journals Lightning trip-out risk assessment and differential lightning protection of 35 kV transmission lines in mountain wind farm

2022 ◽  
Vol 8 ◽  
pp. 581-588
Author(s):  
Ying Yang ◽  
Sen Wang ◽  
Shoufu Wang ◽  
Qijiang Wang ◽  
Wei Xie ◽  
...  
2018 ◽  
Vol 180 ◽  
pp. 05006
Author(s):  
Zofia Wróbel

The valuation of the risk of losses makes easy the correct estimation of resulted threats as a result of atmospheric discharges and harms connected to them. Qualifying the need of lightning protection use for the object, we ought to take into account the risk R for the object and for the public services devices. In every case of examining risks we ought to fulfill: the identification of components RX forming the risk, counting the identified components of the risk RX, the entire risk R, identify the tolerated risk RT and compare the risk R with the tolerated value RT. As a result of such analysis we can come to a decision about the use of protection resources. In the report was realized the risk analysis of devices damages for a chosen object - the signal box with installed station - relaying devices of the railway traffic controlling with a computer adjustable control panel. From the realized analysis results that DEHN Risk Tool is a useful tool for the risk analysis of lightning losses in buildings, making possible the improvement of the calculations process, especially in the range of the choice of proper protection resources.


Author(s):  
Taowei Chen ◽  
Ling Zhu ◽  
Qiao Xia ◽  
Honglei Deng ◽  
Chen Zhou

Fire Safety ◽  
2021 ◽  
Vol 38 ◽  
pp. 24-31
Author(s):  
Yu. Rudyk ◽  
O. Nazarovets ◽  
I. Golovatchuk ◽  
N. Beznos

Introduction. Today requires the introduction and arrangement of modern enterprises automation of the technological process using various electronic and electrical equipment. The breakdown of one sensor leads to a stoppage of the technical process and thousands of losses. This equipment is sensitive to impulse overvoltages that occur for various reasons, as well as when hit by lightning. There is a misconception that the danger of lightning arises only when struck directly, forgetting about the socalled secondary phenomena, namely electromagnetic and electrostatic pulses. Pulse overvoltage is a short-term increase in voltage above the allowable value. Lightning protection systems are designed and designed to protect objects from dangerous lightning.Purpose. Given the automation of the process and the saturation of boilers with electronic and electrical equipment, there is a high risk of lightning and high potentials, which can lead to large-scale accidents. The purpose of this article is to validate the risk indicators for the boiler environment that occur during a thunderstorm.Methods. The use of various methods of calculation, assessment and ordering of risks during the design and layout of the system allows to implementation system lightning protection of buildings, equipment and people. General principles of risk assessment for the boiler environment must take into account: risk and determine the need for protection; the contribution of various risk components to the overall risk; the effect of various protection measures to reduce risk; selection of protection measures taking into account their economic efficiency.Results. Neglecting the high risk of a dangerous event leads to excessive damage and m irreparable losses, with which a person or community will not be able to achieve sustainable development. Therefore, it is a comprehensive, systematic approach to achieving safety, starting from the assessment stage, should take into account both the characteristics of the hazard, including a fire in the relevant facilities, and personal, the individual risk of death or injury. Lightning is an unpredictable natural event, no one in the world fully understands the mechanism of lightning and it is impossible to provide 100% protection under any circumstances under any standardization. For this purpose, the following calculations are given: loss of human life, including injuries; loss of the ability to provide public services; losses of cultural heritage and economic value of the building (structure) and economic losses required for the installation and operation of the system. Based on the obtained data, it is seen how the reduction of each risk is achieved depending on the proposed solution and the economic effect in general.Conclusion. Statistics on deaths and injuries from lightning hazards, losses from damage to property, buildings and struc-tures confirm that in risk assessment, which is standardized in DSTU EN 62305-2, it is necessary to introduce a methodology that would meet the conditions of Ukraine. The arrangement of the lightning protection system depends on the risk assessment, the reaction of the owner, the influence of control bodies. Therefore, it is important to decide on fire protection measures in lightning risk assessment procedures, but it can also be taken regardless of the results of the risk assessment where there is a desire to avoid unacceptable risk. Equipment that is often associated with two different services, e.g. power lines and data lines suffer a lot of surge damage. This case is not covered by the RX risk component. However, appropriate protection measures can be selected and established (see IEC 62305-4).


Fire Safety ◽  
2020 ◽  
Vol 35 ◽  
pp. 54-62
Author(s):  
Yu. Rudyk ◽  
V. Shunkin

Introduction. Thunderstorms in general is produced by atmospherically (climatic) processes, combined with additional hazardous effects. Thus, strong wind, flash flooding and hail causes a long time consequences including damages and injuries. Lightning protection systems are designed and projected in accordance with the requirements of the normative documents, which not always included measures of personal safety and guaranteed absences of injuries. Improving the state of life safety and loss prevention are based on standards and rules, which depend on the results of risk assessment, and investigation of cause’s events. Purpose. The purpose of this article is to analyze this problem in several areas concerning the situation with a systematic approach to the technical regulation in Ukraine of such a sector of life safety as the lightning protection. Methods. Methods of research: calculations using a mathematical model; comparison of the results of the calculation, forecasting of the boundary parameters of the technical condition and monitoring of the lightning location systems properties; examination, qualification, definition of indicators of lightning location system in the composition of the geographical informational system, taking into account laying conditions. Also comparison of different methods for calculating positioning coordinates is given. Results. One of the components of the system lightning protection - the parameters of positioning coordinates of the lightning location system is investigated. The location of lightning strike points is not specified in the applicable fire safety regulations, although this criterion is often used precisely to set fire safety requirements: for buildings, utilities, fire alarm systems, and more. Measures are proposed for implementing test methods and means and incorporating them into standardized technical solutions. In this respect, there can be no claim to the International Electrotechnical Commission and its publications. It is suggested to take into account a number of identified gaps in regulatory documents, relationships between regulators and supervisors, user requests. The analysis of the current normative and technical requirements for the accuracy of coordinates positioning in lightning location systems. On this basis, methods of investigating the causes of events are supplemented, which simplifies the application of impact analysis and the development of protective measures. Conclusion. Determination of the positioning coordinates of lightning stroke is not regulated in the current normative documents on fire safety, although this criterion is often used precisely when establishing requirements for fire safety: to buildings, cable installations, to the installation of fire automatics systems and to others. It is proposed to take advantage of the accuracy in determining the location using mapping geoinformation systems and services in the analysis of indicators of the system of thrust. Conducted theoretical studies of indicators of the lightning location systems have established their relevance for risk assessment methods, measures to prevent losses and to investigate the causes of death, injury to living creatures and other property damage events.


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