基于UHF技术的风电场油浸式主变压器局部放电监测与分析

为了避开风电场主变压器局部放电在线监测中存在的多种形式噪声干扰,引入了基于UHF技术的风电场油浸式变压器局部放电监测与分析方法,设计了UHF局部放电传感器及配套的硬件降频电路,仿真验证了传感器及降频电路的有效性,建立了风电场主变压器超高频局部放电监测与分析模型,研制了硬件构建方案及软件的功能框架,并利用现场实测信号对该方法进行验证.工业实践证明,UHF技术能达到避开风电场现场电磁干扰、可靠获取真实局部放电脉冲、有效诊断变压器内部故障的目的.

Partial Discharge Monitoring and Analysis on the Oil Immersed Main Transformer in Wind Farms Based on UHF Technology

To solve the problem of multiple noises existing in wind farms which affect the partial discharge (PD) online monitoring results of oil immersed transformers,a partial discharge online monitoring and analysis method for the transformers in wind farms based on the ultra high frequency (UHF) technology was put forward and the design of the UHF PD sensor and frequency reduction circuit of its supporting hardware was made.The UHF partial discharge monitoring and analysis model for the transformers,including their hardware framework and software construction scheme was built.The method was verified by the measured signals in a certain wind farm,which proves that the method proposed can effectively avoid electromagnetic interference,obtain reliable real partial discharge pulse,and realize the fault diagnosis for transformers in wind farms.