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实用新型
CN208890368U 一种变电站用过电压防护电路 有权 转让

一种变电站用过电压防护电路
摘要：
本实用新型公开了一种变电站用过电压防护电路，包括有三相进线侧电路、三相出线侧电路和自带中性点的星型连接电路；三相进线侧电路由A1、B1、C1三相进线端和三相联动隔离开关S1以及三相阻尼电阻R1依次串联而成；三相出线侧电路由A2、B2、C2三相出线端和三相联动隔离开关S2以及三相阻尼电阻R2依次串联而成；三相阻尼电阻R1通过导线a、b、c以相同的相序对应连接三相阻尼电阻R2，导线a、b、c分别连接星型连接电路的三相输入端；星型连接电路的每相电路上均串联有阻尼电阻R3，星型连接电路的中性点通过阻尼电阻R4接地；本实用新型结构简单、设计巧妙，有效实现了对母线断路器和出线间隔对地短路故障的过电压防护。(ESM)同样的发明创造已同日申请发明专利
摘要（英）：

The utility model discloses an overvoltage protection circuit for a transformer substation. The overvoltage protection circuit comprises a three-phase incoming line side circuit, a three-phase outgoing line side circuit and a star connection circuit with a neutral point. The three-phase wire inlet side circuit is formed by sequentially connecting three-phase wire inlet ends A1, B1 and C1, a three-phase linkage isolation switch S1 and a three-phase damping resistor R1 in series. The three-phase outgoing line side circuit is formed by sequentially connecting A2, B2 and C2 three-phase outgoing line ends, a three-phase linked isolation switch S2 and a three-phase damping resistor R2 in series; Wherein the three-phase damping resistor R1 is correspondingly connected with the three-phase dampingresistor R2 through wires a, b and c in the same phase sequence, and the wires a, b and c are respectively connected with three-phase input ends of the star-shaped connection circuit; Each phase of circuit of the star-shaped connecting circuit is connected with a damping resistor R3 in series, and a neutral point of the star-shaped connecting circuit is grounded through a damping resistor R4; Theovervoltage protection device is simple in structure and ingenious in design, and effectively realizes overvoltage protection of the bus circuit breaker and the outgoing line interval to-ground shortcircuit fault.

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