电力电缆局放定位中波速确定方法研究

Study to Determine the Velocity for Power Cable PD positioning

由于电缆中局放脉冲传播速度很快,对电缆局放定位误差影响很大。由于电缆参数不同导致其中局放脉冲的传播速度有所差别。波速微小的差别会使定位结果偏差较大。针对不同电缆,局放定位应该采用基于实验确定的波速。在分析了广泛应用的交联聚乙烯(XLPE)绝缘电缆中局放脉冲传播特性后,提出了电缆局放定位中波速确定方法。基于实验数据拟合,得到局放脉冲在电缆中的传播时间与电缆长度的表达式,为局放点精确定位打下基础。

As the cable PD pulse fast propagation, make much influence in cable PD position. As the result of which the cable parameters are different PD pulse propagation velocity differently. Positioning of small differences in velocity will result large deviations. For different cable, PD positioning should be based on the experimentally determined velocity. This paper analyzes the widely used cross - linked polyethylene （XLPE} cable insulation PD pulse propagation characteristics of the proposed cable PD positioning method for determining velocity. The method is based on fitting the experimental data obtained in PD pulse propagation time in the cable and cable length of expression, precise positioning for the PD - point basis.