变压器局部放电在线检测研究进展

Progress on the partial discharge on-line monitoring for transformers

变压器局部放电主要是因为在外施电压作用下,静电荷会在电场中绝缘较弱的位置发生静电游离.这种脉冲型放电是引起绝缘劣化,进而导致变压器故障的主要原因.目前变压器局部放电检测存在的主要问题是难以建立能准确描述放电脉冲在变压器中传播特性的仿真模型,已有的局部放电定位方法都存在较大的局限性,在现场强电磁干扰环境下识别局部放电信号有较大难度.指出综合运用各种信号处理技术,构建统一的在线检测平台,将是变压器局部放电检测未来的发展方向.

The main reasons of partial discharge（PD）of transformers is that electrostatic would dissociate at the position with weak insulation performance through the extraneous voltage.This pulse discharge type can cause insulation degradation,even cause transformer faults.The main problem of the transformer PD is presented,that is,it is difficult to build simulation model of accurately describing discharge pulse propagation in transformer.Current methods of PD have limitations.It is difficult to identify PD in the strong electromagnetic interference environment.Comprehensive using of various signal processing technology and constructing the unified online testing platform are the development direction of PD detection in the future.