Assessment of external insulation problems related to pollution and climatic conditions in Ethiopia

Zelalem, B.; Mamo, Mengesha

doi:10.1109/mei.2020.9111098

Cited by 4 publications

(8 citation statements)

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“…Figure 2 depicts the variations in specific meteorological conditions for Group 1 (Addis Ababa), Group 2 (Assosa), Group 3 (Gode) and Group 4 (Semera). A detail description of climatic and meteorological information in Ethiopia and respective analyses of the conditions for pollution accretion in each grid region, including their estimated site pollution severity class, can be found in our previous works [4,10]. The descriptions of the environmental and meteorological conditions of each group are as follows:…”

Section: Classification Of Grid Regionsmentioning

confidence: 99%

“…They cover a large geographic area, and the major sources of pollution in these regions come from highways, construction sites, transportation, natural dust from local soils, and industrial as well as agricultural activities. These regions are characterized as having a mixture of desert, industrial, and agricultural environments with mainly type A pollution, and their estimated site pollution severity (SPS) class is medium to heavy, according to IEC 60815-1:2008 [10,11].…”

Section: Classification Of Grid Regionsmentioning

confidence: 99%

“…Group 2 comprises the Southwest and West grid region of EEP, stretching from the southwest through to the west of Ethiopia. The major sources of pollution in these regions are from agricultural and mining activities and are mainly of type A with the estimated site pollution severity (SPS) class of light to medium [10,11].…”

Section: Classification Of Grid Regionsmentioning

confidence: 99%

“…The major sources of pollution are mainly dust from semi-arid areas, highways, construction sites, mining, industrial, and agricultural sources. The regions are characterized as having mixture of agricultural and industrial types of environments [10], with type A pollution accumulation and have an estimated site pollution severity (SPS) class of medium to heavy [11].…”

Section: Classification Of Grid Regionsmentioning

confidence: 99%

“…These include various rainfall patterns, lightning intensity, pollution accretion severity, fire occurrence, and others. Lines that are adequately designed for a specific region may not fit well with the other region conditions, where different fault mechanisms dominate [1,9,10]. The pollution type and its severity also vary across the regions.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Pollution-Induced Flashovers of In-Service Insulators in Ethiopian Power Transmission Lines

Desta,

Wogari,

Gubanski

2024

Energies

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Power transmission lines in Ethiopia are experiencing an alarmingly high frequency of unexplained outages triggered by environmental factors, which significantly undermine the reliability of the country’s power system. This paper presents investigations aiming to identify those among the unexplained fault records that have been caused by pollution induced flashovers. An identification method is developed, which associates the contextual fault features, such as information about the characteristics of the fault, fault location, and time of day, as well as month of its occurrence with local meteorological/climatic and environmental conditions. A total number of 4231 unexplained faults, recorded between 2015 and 2022, were analyzed. Among them, 1045 faults (24.7%) were identified as being most likely caused by pollution induced flashovers. The entire network suffered from more than 130 pollution-induced flashovers annually with a frequency of about 0.8 faults/100 km/year. The fault frequency strongly differed among the grid regions, being highest in the Northeast and lowest in the Southwest region. Moreover, the performed analyses also concentrated on the evaluation of the pollution performance of various insulator types employed in the network. The results indicate that porcelain insulators have the highest pollution-induced flashover intensity of 1.47 faults/year/1000 units, followed by silicone rubber polymeric composite insulators and glass insulators with the respective intensities of 1.21 and 0.83 faults/year/1000 units. These results indicate that despite the high expectations towards the pollution performance of silicone rubber polymeric insulators, their use in the Ethiopian climatic and environmental conditions appears to be unsatisfactory.

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Section: Classification Of Grid Regionsmentioning

confidence: 99%

Section: Classification Of Grid Regionsmentioning

confidence: 99%

Section: Classification Of Grid Regionsmentioning

confidence: 99%

Section: Classification Of Grid Regionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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