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发明公开
CN106972476A 一种直流换流站分压器二次侧过电压保护系统及方法 无效 - 驳回 转让

一种直流换流站分压器二次侧过电压保护系统及方法
摘要：
本发明公开了一种直流换流站分压器二次侧过电压保护系统，包括：阻容分压单元、气体放电管和压敏电阻，所述阻容分压单元，用于根据分压比将高电压分压为低电压；所述气体放电管，用于在系统正常工作运行时，与所述压敏电阻共同传输系统在直流分压器二次侧的低电压；用于在暂态情况下气体放电管两端的过电压超过所述气体放电管的放电电压，间隙击穿时，为回路提供泄流通道；所述压敏电阻，用于在系统正常工作运行时，与所述气体放电管共同传输系统在直流分压器二次侧的低电压；用于在暂态情况下气体放电管两端的过电压超过所述气体放电管的放电电压，间隙击穿时，产生残压压降，保证低压回路的电压值大于等于直流分压器二次回路侧的最低工作电压。
摘要（英）：

The invention discloses a DC converter station voltage divider secondary side over voltage protection system, which comprises a resistance-capacitance power dividing unit, a gaseous discharge tube and a varistor, wherein the resistance-capacitance power dividing unit is used for dividing high voltage to low voltage according to a voltage dividing ratio; the gaseous discharge tube is used for transmitting the low voltage of the system at the DC voltage divider secondary side together with the varistor when the system operates normally and providing a discharge channel for a loop in the case of gap breakdown when overvoltage at two ends of the gaseous discharge tube exceeds the discharge voltage of the gaseous discharge tube in a transient condition; and the varistor is used for transmitting the low voltage of the system at the DC voltage divider secondary side together with the gaseous discharge tube when the system operates normally and generating residual voltage drop in the case of gap breakdown when overvoltage at two ends of the gaseous discharge tube exceeds the discharge voltage of the gaseous discharge tube in the transient condition, and thus, the voltage value of the low-voltage loop is ensured to be larger than or equal to the lowest working voltage of the DC voltage divider secondary loop side.

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