消除35kV电网谐振过压的方法

Discussion on method of resonance over-voltage elimination in 35 kV electric network

变压器 35kV侧中性点一般经过消弧线圈等阻抗元件接地或者不接地 ,属于小接地电流系统。针对运行方式变化或其它诱导条件出现时 ,35kV等小接地电流系统可能会产生谐振过电压 ,以一次十分典型的因气候变化而引起的 35kV谐振过电压的事例 ,探讨消除小接地电流系统谐振的一种方法。此方法节约了加装消弧线圈的费用 ,经过一年验证未发生过谐振 ,效果比较好。

Generally, the central point at 35 kV-side of transformer is grounding via the impedance element of arc-extinction coil,or not grounding,it is the system of small grounding current. When operating mode change or other inducing conditions occur, the resonance over-voltage may happen in 35 kV electric network. With a typical incident of resonance over-voltage caused by weather change, a method of resonance over-voltage elimination is discussed, which needs not the arc-extinction coil.Its better effect is proved by one year's operation.