【摘要】 局部放电监测是发电机定子绕组绝缘状况监测的有效手段,笔者提出了拟积分(quasi-integration)局部放电信号采集算法,克服了局部放电信号时域处理方法存在的缺陷,提高了系统的精确度和分辨率。文中分析研究了各拟积分参数对积分效果的影响,并选取了适合该系统的拟积分参数,通过FPGA实现了算法。同时在实验室建立了典型的故障放电模型,构建了一套能够对发电机整个定子绕组绝缘劣化状况进行在线监测的系统,分析了该系统所捕获的故障放电图谱的合理性,得到了较好的实验效果,仿真和实验分别验证了拟积分法监测发电机局部放电的可行性和可靠性。更多还原

【Abstract】 The measurement of partial discharge(PD)is an effective method to monitor the insulation condition of stator windings. In this paper,an algorithm for partial discharge signal acquisition based on quasi-integration is proposed to overcome the defect in partial discharge time domain signal processing method,and to improve the accuracy and resolution of the partial discharge monitoring system. The influences of the quasi-integration parameters on pulse resolution and calculation are analyzed,the suited parameters are selected for generator PD monitoring and the algorithm is implemented through FPGA. A typical fault PD model and a on-line generator PD monitoring system are established in laboratory, and the rationality of the captured fault PD spectrum is analyzed. Simulations and experiments verify the feasibility and reliability of the proposed method for monitoring generator PD based on quasi-integration.更多还原