CAJ | 학술논문

基于时频复合分析的行波故障定位方法依赖于固有频率法的测距可靠性.为进一步提高该方法的测距精度及可靠性,提出一种改进的时频复合分析行波杆塔故障定位方法.首先分析两侧故障信号,分别得到主固有频率,采用改进的固有频率法初步得到故障点位置;然后利用小波工具对信号进行时域分析,根据固有频率法得到的故障位置推导故障点反射波头到达母线的时间;最后由线路两端故障点反射波与初始行波的时间差之比进行杆塔故障定位.EMTP联合Matlab仿真分析表明,该方法提高了固有频率法测距稳定性,有利于时域分析.同时,对400 km线路的杆塔定位误差在400 m以内,耐受过渡电阻达350Ω,在线路长度变化3 km情况下不影响故障测距.
기우시빈복합분석적행파고장정위방법의뢰우고유빈솔법적측거가고성.위진일보제고해방법적측거정도급가고성,제출일충개진적시빈복합분석행파간탑고장정위방법.수선분석량측고장신호,분별득도주고유빈솔,채용개진적고유빈솔법초보득도고장점위치;연후이용소파공구대신호진행시역분석,근거고유빈솔법득도적고장위치추도고장점반사파두도체모선적시간;최후유선로량단고장점반사파여초시행파적시간차지비진행간탑고장정위.EMTP연합Matlab방진분석표명,해방법제고료고유빈솔법측거은정성,유리우시역분석.동시,대400 km선로적간탑정위오차재400 m이내,내수과도전조체350Ω,재선로장도변화3 km정황하불영향고장측거.
Fault location based on time-frequency analysis highly relies on the reliability of natural frequency method. A novel traveling wave fault location by tower based on time-frequency analysis is proposed for improving the fault location reliability and accuracy. First, the fault signals on both sides are analyzed and the natural frequencies are got and the initial fault point is acquired by using improved natural frequencies method. Then, the signal is analyzed by wavelet tools in time-domain. The time of reflection traveling wave from fault point to bus is calculated using the initial fault location result. Finally, the fault is located by the ratio of time spacing between the initial and the reflection wave on both sides. Simulations in EMTP combined with MATLAB show that, the proposed method improves the stability of natural frequency method for time-domain analysis, the error of fault location by tower is less than 400 meters for 400 kilometers line, and itcan tolerate transition resistance up to 350 Ω. At the same time, the fault location results will not change when the line length varies 3 kilometers.