电快速瞬变脉冲群耦合到微机保护装置的途径
EFT Coupling Path to Microprocessor Protection Device
摘要 为了抑制电快速瞬变脉冲群(EFT)对微机保护装置的干扰,研究了EFT的耦合机理,并采取电磁隔离措施切断EFT从一次回路耦合到微机保护装置的途径。首先,开关柜的屏蔽隔板可靠接地并在其表面涂导电涂料;其次,采用转移阻抗小的双层屏蔽电缆与微机保护装置相连;最后,将屏蔽电缆的两端接对地去耦电容。研究结果表明,上述措施可以有效抑制EFT对微机保护装置的干扰。
关键词 电快速瞬变脉冲群;微机保护;耦合机理;屏蔽电缆
Abstract EFT coupling mechanism was studied and anti-jamming measures were
adopted in order to protect microprocessor protection device from EFT.At first,shielding
clapboard should be earthed and coated with conductive paint.Then,microprocessor
protection device should be connected with double-deck shielded cables which has
small transfer impedance. Finally, shielded cables should connect decoupling capacitor
at both ends. The study results indicate that the above countermeasures protect
microprocessor protection device from EFT effectively.
Keywords electrical fast transient/burst;microprocessor protection;coupling mechanism;
shielded cables
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