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DTSTART;TZID=Asia/Kolkata:20240412T093000
DTEND;TZID=Asia/Kolkata:20240412T110000
DTSTAMP:20260525T083040
CREATED:20240409T063344Z
LAST-MODIFIED:20240409T063642Z
UID:241435-1712914200-1712919600@ee.iisc.ac.in
SUMMARY:Colloquium on  Estimation of flashovers in the EHV/UHV lines on the east  coast due to lightning produced by the Bay of Bengal cyclones
DESCRIPTION:Name of the Candidate:       Anirban Chatterjee \nTitle of the Thesis:              Estimation of flashovers in the EHV/UHV lines on the east coast due to lightning produced by the Bay of Bengal cyclones \nDegree Registered:                MTech (Res) in Electrical Engineering \nTime and date:                     9.30 AM\, 12th April 2024 \nVenue:                                   High Voltage Laboratory Seminar Hall of EE Department \nResearch Supervisor:           Professor Udaya Kumar \nAbstract \nThe Bay of Bengal produces a considerable number of cyclones. Many of them invade the east coast of India. They can cause structural damage to towers\, substation flooding\, conductor snapping\, etc. In many cases\, through lightning\, they cause several flashovers on the EHV/UHV grid. However\, there is no serious effort to estimate the possible number of flashovers caused by the lightning produced by such cyclones. The present work aims to fill this serious gap. \nThe estimation of such lightning-induced flashovers requires several aspects\, both electrical and cyclone-related. The lightning stroke could be intercepted by the tower/ground-wire\, or it can strike the phase conductor. The electro-geometric model(EGM)\, suggested in IEEE standards\, is employed for assessing the normalized number of strokes striking the phase conductor and intercepted by the tower/ground-wire. The associated probabilities are also estimated for typical EHV and UHV lines. \nThe relation between the peak stroke current and the rise time is made based on the literature. Then\, by modelling the lines in EMTP with a multi-story model for the tower\, simulations are carried out to deduce the corresponding voltage rise. Using this information and the BIL of the line\, the possibility of flashovers is assessed. \nThe trajectory of the cyclone and the speed\, along with the number of lightning flashes produced by them are assimilated from different sources. Modelling the cyclone as a disc above ground\, the line length shadowed as a function of time is calculated. In addition\, equivalent ground flash density per square km per hour is also calculated. Combining all these information\, the possible number of lighting-induced flashovers in the EHV/UHV grid along the east coast is estimated.  Within three to four days the number of such flashover incidents can range from a few to few tens of flashovers within a time span of two to four days.
URL:https://ee.iisc.ac.in/event/colloquium-on-estimation-of-flashovers-in-the-ehv-uhv-lines-on-the-east-coast-due-to-lightning-produced-by-the-bay-of-bengal-cyclones/
LOCATION:HV seminar Hall
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