Risk-based insulation coordination studies for protection of medium-voltage overhead lines against lightning-induced overvoltages

Mahmood, Farhan; Rizk, Mohammad E. M.; Lehtonen, Matti

doi:10.1007/s00202-019-00783-z

Cited by 20 publications

(9 citation statements)

References 22 publications

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“…Similarly, medium voltage distribution lines shall be protected by using surge arresters in every 200m span of the line, which shall limit the overvoltage stress leading risk of insulator flashover closest to strike point below the tolerable limit (10-1). As shown in Figure 11, by placing periodically grounded shield wires in the medium voltage distribution network, surge arrester can be placed in every 400m for risk factor below 10-1 [93]. Lightning surges might travel to the distribution board of household and industrial consumers and damage the equipment connected.…”

Section: Protection Issues and Their Solutionmentioning

confidence: 99%

Status of Micro/Mini-Grid Systems in a Himalayan Nation: A Comprehensive Review

et al. 2020

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Nepal is a Himalayan country with its 83% of its geography being composed of hills and mountains. Around 22% of the Nepalese population is not receiving electricity through the national power utility and is forced to identify alternative approaches to electrification. The Micro/Mini-Grid (MG) system is one of the promising approaches in terms of cost, reliability and performance for rural electrification, where electrification through national power utility is not techno-economically feasible. However, various issues must be identified and considered during the implementation of MGs in a rural community. In this paper, numerous technical, social and management issues are identified and discussed relating to the implementation and operation of reliable and stable MGs in the Himalayas. To our knowledge, this is the first scientific work that presents a comprehensive review of Himalayan MGs and their associated elements. This article reviews the available research articles, project documents, and Government reports on MG development, from which a clear roadmap is constructed. From the comprehensive study, it is observed that the existing MGs are not adequately designed for the specific area, considering the local resources and local information. Based on the identified issues, some practical and efficient recommendations have been made, so that future MG projects will address the possible problems during the design and implementation phase.

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Section: Protection Issues and Their Solutionmentioning

confidence: 99%

Status of Micro/Mini-Grid Systems in a Himalayan Nation: A Comprehensive Review

et al. 2020

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“…As the main channel for transmission of electricity from the west to the east and from cloud to Guangdong, it is necessary to analyze the causes of frequent lightning damage on the mountain lines. Literature [1] established a calculation model of tripping rate of mountain power transmission and distribution lines considering the impact of mountain terrain on lightning. In Reference [2], the lightning arrester is installed in the line to improve the lightning resistance level of the line.…”

Section: Introductionmentioning

confidence: 99%

Analysis and improvement of measures for lightning protection of 35kV transmission line in a mountainous area

Weng¹,

Li²,

Huang³

et al. 2022

J. Phys.: Conf. Ser.

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Lightning is an important factor affecting the safe and reliable operation of power transmission and distribution lines. As most power transmission and distribution lines are built in mountainous areas with complex terrain and changeable weather, the lightning accidents in mountainous areas are much higher than those in plain areas. Firstly, the mechanism of lightning damage and common measures of lightning protection are analyzed. Then, taking Lufeng line in Yunnan province as the object, taking the topographic and geomorphic characteristics of the line, the activity intensity of lightning strike and the line structure into consideration, three measures are compared by increasing the number of insulator string pieces, reducing the grounding resistance of poles and towers, and erecting lightning conductor across the line. Finally, erecting lightning conductor across the line is adopted to rectify the line. The feasibility and practicability of the rectification scheme are proved by calculation.

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“…The methods of protecting electric distribution networks against lightning discharges are essentially based on three criteria [3], which are: the increased insulation level of the equipment; the use of shielding cables [4,5]; and the use of lightning arresters, the last two being the most used in most cases [6] . In an ideal scenario, the combined solution of the three protection procedures such as the use of effectively grounded shielding conductors throughout the electric network extension, an increased insulation class of insulators, and insertion of lightning arresters at all distribution grid poles theoretically would protect the network from disruptive effects caused by overvoltages of atmospheric origin.…”

Section: Introductionmentioning

confidence: 99%

Methodology for Analysis of Electric Distribution Network Criticality Due to Direct Lightning Discharges

et al. 2020

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Direct lightning discharges in overhead distribution networks invariably cause serious insulation damage, frequently leading to the electric system’s partial or total shutdown. Installing lightning arresters can be very effective, and it is commonly used to minimize this problem; however, considering that typically, electric distribution grids exhibit a very large number of electrical nodes, the massive use of lightning arresters may not be economically viable. In this way, this article proposes a methodology for allocating lightning arresters that can significantly reduce the number of lightning arresters installed, but at the same time maintaining an adequate protection level for the distribution grid. The proposed methodology, named Direct Discharge Crossing (DDC), analyzes the network criticality based on two main factors, which are the overvoltage magnitudes and the number of flashovers provoked by lightning discharges, and defines a feeder lightning performance function that is used to indicate the recommended location for lightning arresters’ installation. The simulation studies are accomplished using the IEEE 34 bus distribution grid and ATP software to demonstrate the efficacy of the proposed solution, which is confirmed by the results presented.

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Risk-based insulation coordination studies for protection of medium-voltage overhead lines against lightning-induced overvoltages

Cited by 20 publications

References 22 publications

Status of Micro/Mini-Grid Systems in a Himalayan Nation: A Comprehensive Review

Status of Micro/Mini-Grid Systems in a Himalayan Nation: A Comprehensive Review

Analysis and improvement of measures for lightning protection of 35kV transmission line in a mountainous area

Methodology for Analysis of Electric Distribution Network Criticality Due to Direct Lightning Discharges

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