CAJ | 학술논문

在零序电压、电流中，暂态分量的衰减时间常数及频率与故障距离相关，其值可由象函数特征方程的根表示。分析了该函数与故障距离的关系，提出了一种基于特征根的单端测距方法。该方法结合拉氏变换与双曲函数线路模型，由零序电压、电流象函数的特征方程，得到了象函数测距方程，同时，利用特征频段(SFB)的性质，提出了该测距方程在SFB内的等效形式，通过 Prony 算法，从采样信息中提取 SFB内的特征根，采用搜索法求解超越方程，实现了故障测距。该单端测距方法可准确得到故障距离的解析表达式，且克服了传统双曲函数模型不能用于暂态计算的问题。大量的EMTP 仿真实验结果验证了该方法的正确性，不受过渡电阻、故障初始角、中性点运行方式的影响，能够满足实际工程需求。
재령서전압、전류중，잠태분량적쇠감시간상수급빈솔여고장거리상관，기치가유상함수특정방정적근표시。분석료해함수여고장거리적관계，제출료일충기우특정근적단단측거방법。해방법결합랍씨변환여쌍곡함수선로모형，유령서전압、전류상함수적특정방정，득도료상함수측거방정，동시，이용특정빈단(SFB)적성질，제출료해측거방정재SFB내적등효형식，통과 Prony 산법，종채양신식중제취 SFB내적특정근，채용수색법구해초월방정，실현료고장측거。해단단측거방법가준학득도고장거리적해석표체식，차극복료전통쌍곡함수모형불능용우잠태계산적문제。대량적EMTP 방진실험결과험증료해방법적정학성，불수과도전조、고장초시각、중성점운행방식적영향，능구만족실제공정수구。
In the zero-sequence voltage and current, the decay time constant and the frequency of the transient component associated with the fault distance and its value as a image function of the characteristic equation can be expressed in the root. It is analyzed the relationship between the function and the fault distance, and presented a single terminal location method based on characteristic roots. The method combines the Laplace transform with hyperbolic function line model, and obtain image function location equation. Meanwhile, using the nature of the special frequency band(SFB), it is presented the equivalent form of this equation in the SFB. By Prony algorithms to extract the eigenvalue in the SFB and use the search method of solving equations, to achieve the fault location. The single-Terminal fault location method can be obtained the analytical expressions accurately, and overcome hyperbolic functions of the traditional model which can not be used to calculate the transient problem. EMTP digital simulation results verify the correctness of the algorithm without the impact of transition resistance, fault inception angle, the neutral point operation mode, which can meet the needs of practical engineering.