CAJ | 학술논문

山火条件下输电线路间隙的绝缘强度大幅下降,导致线路跳闸事故频发,给电网的安全稳定运行带来了严重影响. 文章选取了输电线路走廊易引发线路跳闸的3种典型植被,对其火焰的绝缘特性进行了试验测量,并分析了植被火焰绝缘强度的影响机制;研究结果表明,在植被燃烧强度较大时,3种植被的火焰电阻率均较小,其中,杉树枝的最小,为3 kΩ· m,杉树干的最大,也达到30 kΩ· m,远低于纯空气间隙的绝缘强度;植被火焰的绝缘特性与火焰高度、温度、烟尘浓度、灰分含量等因素有关,而当火焰温度较低时,火焰高度与燃烧强度对植被火焰的绝缘特性影响较大. 因此,控制输电线路走廊植被的高度和密度可以从根本上减少山火导致线路跳闸事故的发生.
산화조건하수전선로간극적절연강도대폭하강,도치선로도갑사고빈발,급전망적안전은정운행대래료엄중영향. 문장선취료수전선로주랑역인발선로도갑적3충전형식피,대기화염적절연특성진행료시험측량,병분석료식피화염절연강도적영향궤제;연구결과표명,재식피연소강도교대시,3충식피적화염전조솔균교소,기중,삼수지적최소,위3 kΩ· m,삼수간적최대,야체도30 kΩ· m,원저우순공기간극적절연강도;식피화염적절연특성여화염고도、온도、연진농도、회분함량등인소유관,이당화염온도교저시,화염고도여연소강도대식피화염적절연특성영향교대. 인차,공제수전선로주랑식피적고도화밀도가이종근본상감소산화도치선로도갑사고적발생.
The insulation strength of the transmission lines gap has a significant decline under the wildfire, then lead-ing to the frequent line tripping accidents, which has a serious effect on the safe and stable operation of the grid. Three kinds of typical vegetation which can easily lead to the line tripping were selected in this paper, and the insula-tion strength of the vegetation flames were measured, meanwhile, the influence mechanism of the insulation strength of vegetation flame has been analyzed.The results show that, the resistivity of the three vegetation flame is small under the large burning intensity.Among them, fir branch is minimum, for 3 kΩ· m, and fir body is largest, reached to 30 kΩ· m, the insulation strength of which are lower than pure air gap.The insulating properties of vegetation flame are related with the flame height, temperature,smoke concentration, ash content and other factors, while the flame height and burning intensity have a greater impact on the insulation characteristics of vegetation flame when the temperature is lower.Hence, controlling the height and density of vegetation in the transmission line corridor can reduce the acci-dents of line tripping under wildfire radically.