CAJ | 학술논문

为提高输电线路故障定位精度,提出了一种基于电流分布式测量和相位比较的输电线路故障定位新方法。该定位方法基于低成本的无线传感网络和Rogowski电流互感器提供的大量电流测点,利用全相位快速Fou-rier变换（FFT）算法计算电流故障分量的相位,通过比较相邻测点的电流相位差和设定阈值的大小关系将故障点定位在相邻测点所在杆塔之间并判断出故障类型。考虑了如Rogowski电流互感器的传变特性、全相位FFT算法的抗噪性能等可能造成电流相位误差的一些主要因素影响,并对各种不同故障情况进行了仿真模拟,结果表明相角差阈值设在65°～75°间能够满足正确的故障判别要求。
위제고수전선로고장정위정도,제출료일충기우전류분포식측량화상위비교적수전선로고장정위신방법。해정위방법기우저성본적무선전감망락화Rogowski전류호감기제공적대량전류측점,이용전상위쾌속Fou-rier변환（FFT）산법계산전류고장분량적상위,통과비교상린측점적전류상위차화설정역치적대소관계장고장점정위재상린측점소재간탑지간병판단출고장류형。고필료여Rogowski전류호감기적전변특성、전상위FFT산법적항조성능등가능조성전류상위오차적일사주요인소영향,병대각충불동고장정황진행료방진모의,결과표명상각차역치설재65°～75°간능구만족정학적고장판별요구。
In order to improve the fault location accuracy, we proposed a novel fault location scheme for transmission lines based on distributed current measurements and their phases comparison. This fault location scheme is based on lots of current measurements provided with lowcost wireless sensor networks and Rogowski coil current transformers, and all-phase FFT algorithm is used to calculate the phase angle of the fault current component. By comparing the phase angles of the fault current components with the threshold value, the fault point can be located between two towers on which the adjacent measurements are installed and the fault type can also be identified. Some of the main factors that may result in current phase angle errors are taken into account, such as the transfer characteristics of Rogowski coil current transformer, the anti-noise performance of all-phase FFT, etc. All kinds of fault cases are verified by simulation, and the results show that the correct fault identification requirements can be met when the phase angle difference threshold value is set at 65° to 75°.