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Article Information:
Analysis of the Dependence of Power Outages on Lightning Events within the Ijebu Province, Nigeria
J.O. Adepitan and E.O.Oladiran
Corresponding Author: J.O. Adepitan
Submitted: July 21, 2012
Accepted: August 17, 2012
Published: September 20, 2012 |
Abstract:
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The study aimed at developing a model for lightning-induced outages in Nigeria from results obtained on
determining the proportion and rate of lightning-induced outages out of the total power outages experienced in Ijebu
province of Nigeria. Power outage records for Ijebu province, comprising Ijebu-Ode and Sagamu areas, Ogun state,
Nigeria for the years 2002-2006 were collected from Power Holding Company of Nigeria (PHCN). Unintentional
stochastic outages were separated from those due to deliberate load shedding. Lightning events records were
collected from Nigeria Meteorological Agency for the same period. The two sets of time series were superimposed.
Outages with time, t<1 min after lightning events were classified as ‘Lightning-Induced’ (LI). Those with 1≤t≤6 min
were classified as ‘Possibly Lightning-Induced’ (PLI) while those with t>6 min were classified as ‘Others’ (OT).
The two sets of data were analyzed in order to determine percentage of lightning-induced outagfes. Also,
thunderstorm days and power line parameters were used as input data for modified FLASH 1.7 software
(considering tropical region) to estimate the rate of lightning induced outages. The five-year period, 2002 to 2006,
experienced no significant difference (p<0.05) in the mean of percentage of LI outages for both areas, calculated as
8.6 for Ijebu-Ode and 9.5 for Sagamu. The corresponding values for PLI being 1 and 2%; whereas OT had values
90.4 and 88.5%. Where earth wires were available on the transmission lines, the mafn lightning-induced outage rate
was 1/100 km-year. The mean flashover rate for unshielded lines was 22/100 km-year. A linear relationship was
established between the annual lightning-induced outages and the annual lightning days for the province. Lightning
accounted for approximately 10% of the random outages experienced in Ijebu province. Lightning-induced outages
are linearly related to lightning days. Lightning-induced outage rate is much higher over unshielded than shielded
transmission lines.
Key words: Lightning-induced outage distribution, power outages, thunderstorm days, , , ,
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Cite this Reference:
J.O. Adepitan and E.O.Oladiran, . Analysis of the Dependence of Power Outages on Lightning Events within the Ijebu Province, Nigeria. Research Journal of Environmental and Earth Sciences, (09): 850-856.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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