【摘要】 在直流输电工程中,交流滤波器电抗器在谐波电流的作用下会出现发热或过载现象,电抗器谐波热过负荷保护是避免电抗器因过热导致损坏的主保护,理解并掌握该保护的设计原理及实现过程才能在实际工程中正确配置保护相关参数,详细研究了交流滤波器电抗器热过负荷保护的设计及实现方法,对保护中的集肤效应滤波器参数确定方法、保护算法、定值计算均进行了详细分析,并根据交流滤波器电抗器耐受谐波电流设计能力通过PSCAD/EMTDC仿真计算校核了保护设计及相关参数的正确性,在实际工程中可以按照所述方法根据电抗器生产厂家提供的集肤效应系数进行集肤效应滤波器参数的计算,根据谐波热等效电流计算保护定值,该方法对于直流工程的交流滤波器电抗器热过负荷保护配置具有实际指导意义。更多还原

【Abstract】 In HVDC power transmission projects the thermal overload of AC filter reactor may occur due to harmonic currents.The harmonics-caused thermal overload protection is the main protection for the reactor to avoid the damage due to thermal overload,so it is necessary for the correct configuraion of related protection parameters to understand the principle of this protection and master its design and implementation.The design and implementation of harmonics-caused thermal overload protection for AC filter reactor are researched in depth,and the skin-effect of harmonic currents,the determination of filter paramters,protection algorithm and setting calculation are analyzed in detail,and according to the designed withstanding ability of AC filter reactor to harmonic currents the correctness of the desing and related paramters are checked by PSCAD/EMTDC simulation.Based on the presented method and according to the skin-effect coefficient provided by reactor manufacturer the parameters of skin-effect filter can be calculated,and according to thermal equivalent current of harmonic currents the setting of the protection can be calculated.The proposed method is available for reference to the configuration of thermal overload protection for AC filter reactor used in HVDC projects.更多还原