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008 220200s1999 th uu m rtt 00| a1eng d
035 _a.b11778386
099 9 _aAIT Thesis no.ET-99-17
100 1 _aPham Quang Huy
245 1 4 _aThe analysis of lightning risk for a 500KV GIS substation :
_ba case study in Vietnam
260 _aBangkok :
_bAsian Institute of Technology,
_c1999
300 _a86 leaves
490 1 _aThesis ;
_vno. ET-99-17
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Environment Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1999
520 _aThe major problem of insulation level of GIS substation is the overvoltages due to lightning, especially with high value of lightning current. This study concerned with electromagnetic transients to evaluate the failure risk of insulation of equipment. It is more importance because this study is applied for 500kV GIS substation, the new equipment with many advantages of small space requirement, low maintenance cost, low environmental impact, etc. In this study, modeling of the power system and lightning source has been done in the transient state. By using EMTP program, the overvoltages due to lightning have been calculated in various cases of changing lightning current, point of lightning impact, phase angle of power frequency voltage, i.e .. The overvoltage results inside the 500kV GIS are collected for evaluating the risk of failure. A method for estimating the risk of failure of an apparatus as a result of lightning strikes on the transmission lines has been developed to meet the requirements of quick and low-variability calculation. The results shown that with tower footing resistance is 10 ohms· or less, the risk due to lightning can be accepted. Otherwise, the solution to reduce the risk of failure for 500kV GIS substation could be carried out by installing surge anester, reducing tower surge impedance, re-arrange the spans, etc. The calculation can be used efficiently as a calculated process of substation design.
650 0 _aElectric substations
_zVietnam
650 0 _aLightning protection
_zVietnam
700 0 _aSurapong Chiraratananon,
_eChairperson
700 1 _aYu, Cun Yi,
_eExamination Committee
700 1 _aDhadbanjan, Thukaram,
_eExamination Committee
710 2 _aSida,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. ET-99-17
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B12781
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