【摘要】 针对全光纤电流互感器(FOCT)传感环不闭合易受相间磁场干扰的问题进行了研究,并提出了一种提高不闭合FOCT抗相间磁场干扰能力的新方法。建立了不闭合FOCT相间磁场干扰数学模型,通过理论研究和仿真分析得出传感环不闭合度、传感环半径、传感环缠绕匝数和相间距离是构成相间磁场干扰特性的主要因素,且总有两个最佳方位角,使得相间磁场不会干扰本相FOCT准确度。据此提出了一种最佳方位角优化方法,即通过将FOCT摆放到最佳方位角,来提高抗相间磁场干扰的能力。实验结果与理论分析相一致,并验证了所提方法的正确性。通过该方法,相间磁场干扰引起的误差由-0.27%下降到-0.02%,使不闭合FOCT满足0.2级要求。更多还原

【Abstract】 The fiber sensing coil of all unclosed fiber-optic current transformers( FOCT) is susceptible to be interfered by magnetic crosstalk and proposes a method that improves the anti-interference ability of magnetic crosstalk. The UFOCT magnetic crosstalk mathematical model is established. The main factors of magnetic crosstalk characteristics contains the unclosed-extent,radius of sensing coil,winding turns of sensing coil and phase distance are obtained through theoretical research and simulation analysis. Meanwhile there are always two best azimuth angles which have UFOCT accuracy immunized magnetic crosstalk. Hereby a optimization method,which set the sensing coil of UFOCT at the best azimuth angle to improve the anti-interference ability of magnetic crosstalk,is proposed. Experimental results are consistent with theoretical analyses and verifies the correctness of the proposed method. The result shows that error induced by magnetic crosstalk reduced from- 0. 27% down- 0. 02% with the proposed method,which makes the UFOCT to achieve the 0. 2-class standard.更多还原