考虑相角特征的无死区新型触／漏电保护技术

摘要

The residual current protective technique and its major deficiencies are investigated .It is pointed out that the touch/leakage current could be extracted from the total residual current by using current separation technology based on the phase re -lationship between normal residual current and touch /leakage current.A novel leakage current protection principle without protection dead-zone is proposed.The implementation program based on DSP is investigated .The proposed method proves to be accurate and feasible in digital simulations .Compared to the existing techniques either based on residual current amplitude or its variation, the proposed method can effectively eliminate protection dead -zone and drastically improve the reliability of protection devices.%　　针对现有基于剩余电流保护技术的漏电保护器存在保护死区的不足，基于正常剩余电流与触／漏电故障电流之间的相位关系，提出电流分离技术，将触／漏电电流从总剩余电流中分离出来。提出了一种新型无死区漏电保护原理，基于DSP对其实施方案进行了研究，并通过数字仿真证明了该方法的正确性和可行性。与现有基于剩余电流幅值和幅值变化量的漏电保护技术进行的对比结果证明，能有效消除保护死区，极大地提高保护装置动作的可靠性。