变电站电磁干扰源对二次系统耦合机理研究

Research on Coupling Mechanism of Substation Electromagnetic Interference Source to Secondary System

变电站中存在大量会产生电磁干扰的电力设备,电磁干扰会对二次系统运行的可靠性和稳定性产生影响。为了研究变电站中电磁干扰源对二次系统的耦合机理,对变电站内典型的稳态和暂态电磁干扰源进行了介绍,其次分析了传导耦合、电容性耦合、电感性耦合、辐射耦合4种耦合路径,建立了变电站中电磁干扰源与二次系统的整体电磁耦合对应关系,进而提出变电站内二次设备抗电磁干扰的措施,采用屏蔽、接地、滤波等措施可以有效抑制电磁干扰产生的问题;该研究对进一步提高变电站内二次系统的电磁兼容能力有着一定的借鉴意义。

There are a large number of power devices that can produce electromagnetic interference in the substation.The electromagnetic interference will affect the reliability and stability of the secondary system.In order to study the coupling mechanism of electromagnetic interference to the secondary system in the substation,this paper first introduces typical steady-state and transient electromagnetic interference sources in the substation.Secondly,the paper analyzes the four coupling paths of conductive coupling,capacitive coupling,inductive coupling and radiative coupling to establish the global electromagnetic coupling correspondence between the electromagnetic disturbance source and the secondary electromagnetic system in the substation.Furthermore,the paper puts forward measures for anti-electromagnetic interference of secondary devices in the substation,and that the measures such as shielding,grounding and filtering can effectively suppress the problems caused by electromagnetic interference.The research has certain referential significance for further improving the electromagnetic compatibility of the secondary system in the substation.