【作者】 许道林；

【导师】 廖瑞金；

【作者基本信息】 重庆大学 ， 电气工程， 2003， 硕士

【摘要】 本文针对变电站电容性设备介质损耗和MOA泄漏电流阻性分量测量的特点和要求，按照以软件分析为主的变电站电气设备绝缘在线监测的原理和实施方案，完成了监测系统硬件、软件的设计、制作并开发了适合于重庆大竹林220kV变电站电气设备绝缘的在线监测装置，完成了装置的安装、调试和运行的数据分析。 本文研究了电容性设备绝缘介质损耗的数字化监测方法：谐波分析法，并采用谐波分析法在现场进行了测试，结果表明该方法在介损测试中具有较高的稳定性和准确性。 本文还研究了用谐波分析法监测MOA泄漏电流阻性分量的原理和实现这一方法对硬件电路的要求。通过理论和实测数据分析表明，该方法能准确反映总阻性泄漏电流和阻性基波泄漏电流。 在硬件电路的实现上，选择了合适的信号传感器：合理设计了信号程控放大电路和滤波电路；数据采样／保持电路和现场基于RS-485网络结构的硬件通信系统；结合软件控制选用了12位高精度的A／D集成数据采集卡，使软件编程简化且具有较高的灵活性和可扩展性。 经过系统调试、实测数据分析表明，本文设计的大竹林220kV变电站电气设备绝缘在线监测系统对电容性设备介质损耗和MOA阻性泄漏电流的监测是有效的，其稳定性和精度较高，能够满足电力变电站生产的实际需要。更多还原

【Abstract】 This paper, according to the characteristic and requests of measurement for the medium loss of electric capacitive equipment and the resistive weight of MOA leak current in a power substation, according to the on-line monitoring principle and implementing scheme of electric equipment in substation relying mainly on the means through the software analysis, finish the design and the fabrication of monitoring system hardware and software, and then empolder the on-line monitoring equipment fitting for the 220kV substation of DaZhuLing in ChongQing, have finished the installation, debugging and the data analyzing of the running device.This text research the digitalization monitoring method for the medium loss of electric capacitive equipment: the harmony wave analytic approaches, and then adopt the method to test in scene. The result indicate that this method using in the medium loss testing have higher stability and accuracy.This article also study the principle with harmony wave analytic approaches monitoring the resistive weight of MOA leak current and realize this requisition on hardwares circuit. Through the analysis of theoretic and testing data, it indicate this method can have been accurate to reflect the total resistive leak current and the resistive leak current of base wave.In the design of the circuit of hardware, the paper choose the suitable signal sensor, rationally designing the signal enlarging circuit by programme-controlled and signal filter circuit designing the sampling at datas /retaining circuit and hardware communications based on RS-485 network. Combining with software-controlled it select the integrated gathering-card of A/D datas of the high accuracy for the 12th precision, which simplify software programmings and have higher flexibility and can extensible .Through system debugging ,testing datas analysis, it indicate that the on-line monitoring system of electric equipment for the 220kV substation of DaZhuLing in ChongQing designed in this text is effective for the measurement of the medium loss of electric capacitive equipment and the resistive weight of MOA leak current in power substation.The result, its stability and precision are relatively high.It is able to satisfy power substation demands.更多还原