电快速瞬变脉冲群耦合机理的研究.docVIP

电快速瞬变脉冲群耦合机理的研究 摘 要 我国微机保护装置抗电快速瞬变脉冲群的研究工作刚刚起步。为了避免电力系统中微机保护失灵事故的发生，本文主要研究如何EFT从电力系统一次回路耦合到微机保护装置途径。在电快速瞬变脉冲群耦合机理方面分析了一次回路中形成的电快速瞬变脉冲群耦合到微机保护装置的主要途径，电快速瞬变脉冲群制定的隔离措施：1）在仿真软件ANSOFT中建立开关柜模型，通过仿真研究如何减弱电快速瞬变脉冲群引起的瞬态电磁场在微机保护装置的外壳上感应出的干扰电压和干扰电流。2）提出应选择转移阻抗小的二次电缆与微机保护装置相连，并且采取多层屏蔽，用增大屏蔽层阻抗的方法减小耦合到屏蔽层的电流。3)EMPT-ATP中建立电力互感器的电磁单元模型，仿真研究抑制电快速瞬变脉冲群通过电磁式电力互感器从一次回路耦合到二次侧微机保护装置的措施。目前电磁干扰源的量化分析和耦合途径的建模分析研究还不够成熟，本文提出用数据挖掘技术预测与分析微机保护装置所处的电磁环境 关键词：一次回路耦合到微机保护途径；电快速瞬变脉冲群；微机保护装置；电磁兼容；耦合方式 Electricity fast transient pulse coupling mechanism research Abstract Our microprocessor-based protection fight eft measurement research work is just beginning. To avoid electric power system microcomputer protection failure accident, this paper mainly studies how to EFT from power system a loop coupled to the microcomputer protection dev- ice way. In eft measurement coupling mechanism analysis a loop of the formation of eft me- asurement is coupled to the main ways of microcomputer protection device, eft measurement of quarantine measures enacted: 1) establish switchgear model in ANSOFT through simulati- on research how to abate, eft measurement of transient electromagnetic field caused micropr- ocessor-based protection on the shell out of interfering voltage induction and disturbance cu- rrent. 2) put forward should choose the second cable transfer impedance small connected wit the microcomputer protection device, and take multi-layer shielding, by increasing the shield impedance method to reduce the current coupling shield. 3) - EMPT of establishing power tr- ansformer in ATP electromagnetic unit model simulation research, inhibit eft measurementor through from a loop of voltage transformer assolenoid style coupled to secondary side protec protecprotectimicroprocessor-based measures. At present the electromagnetic interferenceion source of quantitative analysis and coupling channels mature enough modeling analysis, this paper proposes the use of data mining technology