CAJ | 학술논문

对配电线路的感应过电压及耐雷性能进行研究。通过相模变换将Agrawal模型转换为模量的波动方程,根据特征线法对波动方程进行分析,得到感应过电压的等值计算电路,并对雷电电磁场的计算方法进行简化。建立感应过电压在PSCAD/EMTDC软件中的计算模型,与数值计算方法比较以验证模型的准确性,分析土壤电阻率对感应过电压的影响及避雷器、耦合地线降低感应过电压的效果。结果表明,应对土壤电阻率较高地区配电线路重点保护；线路绝缘水平较低时(l50 kv)要有效降低感应过电压,在土壤电阻率较低、较高时避雷器间距分别不宜大于400 m、200 m,绝缘水平较高(300 kv)且土壤电阻率较高时,避雷器间距不宜大于400 m；耦合地线与线路高度差越小,降低感应过电压效果越明显。
대배전선로적감응과전압급내뢰성능진행연구。통과상모변환장Agrawal모형전환위모량적파동방정,근거특정선법대파동방정진행분석,득도감응과전압적등치계산전로,병대뇌전전자장적계산방법진행간화。건립감응과전압재PSCAD/EMTDC연건중적계산모형,여수치계산방법비교이험증모형적준학성,분석토양전조솔대감응과전압적영향급피뢰기、우합지선강저감응과전압적효과。결과표명,응대토양전조솔교고지구배전선로중점보호；선로절연수평교저시(l50 kv)요유효강저감응과전압,재토양전조솔교저、교고시피뢰기간거분별불의대우400 m、200 m,절연수평교고(300 kv)차토양전조솔교고시,피뢰기간거불의대우400 m；우합지선여선로고도차월소,강저감응과전압효과월명현。
In Order tO study the lightning induced OvervOltage ( LIv ) and lightning perfOrmance Of distributiOn lines, the Agrawal mOdel was cOnverted tO mOdal expressiOn using the similarity transfOrmatiOn, and the expressiOn was analyzed with the methOd Of characteristics. An equivalent calculating circuit Of LIv was Obtained with the analysis with which a calculating mOdel in PSCAD/EMTDC was prOpOsed and verified fOr the accuracy Of the mOdel. The influences Of sOil resistivity, surge arrester and cOupling grOund wire On LIv were alsO analyzed. The results shOw that, distributiOn lines lOcated in high sOil re-sistivity regiOn shOuld be prOtected with particular emphasis; fOr lOw insulatiOn lines, the LIv is dramatically diminished when the sOil resistivity is lOw and arrester installatiOn interval is less than 400 m, Or the sOil resistivity is high and arrester installatiOn interval is less than 200 m;fOr high insulatiOn level lines, the arrester installatiOn interval shOuld be less than 400 m when the sOil resistivity is high;and lastly the smaller the altitude difference between line cOnductOrs and neutral cOnductOr is, the larger the lightning induced vOltages decrease.