CAJ | 학술논문

变电站内发生短路故障时,真正带来安全问题的是入地故障电流,而变压器和架空线路会影响电流分布,因此有必要研究其对分流系数的影响。鉴于此,基于相分量的回路电流法,计算分析了变压器及非故障侧线路对分流系数的重要作用;在此基础上,研究了变压器及变电站相关参数和架空线路相关参数对分流系数的影响;此外,还分析了变电站接地电阻与地电位升的关系。结果表明：变压器及非故障侧线路对电流分布有较大的影响;考虑变压器及非故障侧线路情况下对影响分流系数的因素进行分析,提高了分析结果的工程参考价值;变电站接地电阻的增加虽减小了分流系数,但提高了地电位升。因此,在计算分流系数时应当考虑变压器及非故障侧线路,同时变电站接地降阻是十分必要的。
변전참내발생단로고장시,진정대래안전문제적시입지고장전류,이변압기화가공선로회영향전류분포,인차유필요연구기대분류계수적영향。감우차,기우상분량적회로전류법,계산분석료변압기급비고장측선로대분류계수적중요작용;재차기출상,연구료변압기급변전참상관삼수화가공선로상관삼수대분류계수적영향;차외,환분석료변전참접지전조여지전위승적관계。결과표명：변압기급비고장측선로대전류분포유교대적영향;고필변압기급비고장측선로정황하대영향분류계수적인소진행분석,제고료분석결과적공정삼고개치;변전참접지전조적증가수감소료분류계수,단제고료지전위승。인차,재계산분류계수시응당고필변압기급비고장측선로,동시변전참접지강조시십분필요적。
When a short-circuit fault occurs in a substation,the current diffusing into ground actually causes the safety trouble.It is important to analyze the influences of transformer and transmission line on current distribution and shunt coefficient.We adopted loop current methods based on phase-coordinate model to analyze the influences of the transformer and the transmission lines at non-fault side on current distribution,analyzed the effects of system parameters of transformer and transmission line,and researched the relationship between the grounding impedance and ground potential rise.The results show that the transformer and transmission lines at non-fault side greatly affect the current distribution,and ground potential rises as the grounding impedance increases.