CAJ | 학술논문

为了提高行波保护在小初始角故障时的灵敏性与可靠性，降低行波保护的采样频率，提出基于 S 变换的初始行波相位比较式方向继电器。通过分析故障初始电压、电流行波之间的关系特征，定义了初始行波相位差，该相位差的大小仅由故障网络决定，与故障距离、过渡电阻、故障类型等因素无关。利用 S 变换提取单频率的电压、电流初始行波在时域中的幅值、相位，并计算初始行波相位差，通过比较该相位差与整定值的大小判断故障方向。PSCAD/EMTDC 仿真研究中采样频率为25 kHz。大量仿真结果表明：该算法能可靠、灵敏、超高速识别正反方向故障，其性能受故障初始角、故障类型、故障距离、故障电阻的影响小。
위료제고행파보호재소초시각고장시적령민성여가고성，강저행파보호적채양빈솔，제출기우 S 변환적초시행파상위비교식방향계전기。통과분석고장초시전압、전류행파지간적관계특정，정의료초시행파상위차，해상위차적대소부유고장망락결정，여고장거리、과도전조、고장류형등인소무관。이용 S 변환제취단빈솔적전압、전류초시행파재시역중적폭치、상위，병계산초시행파상위차，통과비교해상위차여정정치적대소판단고장방향。PSCAD/EMTDC 방진연구중채양빈솔위25 kHz。대량방진결과표명：해산법능가고、령민、초고속식별정반방향고장，기성능수고장초시각、고장류형、고장거리、고장전조적영향소。
To improve the sensitivity and reliability of the travelling wave based relays for small inception angle faults, and decrease the sampling frequency, the algorithm of S transform based travelling wave phase comparison directional relay is presented in this paper. Based on studying the relationship features of initial voltage travelling wave and initial current travelling wave, the initial travelling waves phase difference Is defined. Its value is determined by the fault network, and has nothing to do with the factors such as fault location, fault resistance and fault types. S transform is used to extract the initial travelling waves of single frequency to calculate the initial travelling waves phase difference. The algorithm judged the fault direction through comparing the phase difference and the settings. In the PSCAD/EMTDC simulation, the sampling frequency is 25 kHz. Numerous simulation results show that this proposed algorithm can discriminate a fault as forward or reverse direction rapidly and reliably, and its performance can endure the influences of various factors, including different fault inception angles, fault types,fault distances, fault resistances.