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消弧线圈发展过程

网址:www.xiaohuxianqua.cn  2019-11-26  作者:admin    阅读:

消弧线圈发展过程
Development process of arc suppression coil
消弧线圈早期采用人工调匝式固定补偿的消弧线圈,称为固定补偿系统。固定补偿系统的工作方式是:将消弧线圈整定在过补偿状态,其过补程度的大小取决于电网正常稳态运行时不使中性点位移电压超过相电压的15%,之所以采用过补偿是为了避免电网切除部分线路时发生危险的串联谐振过电压。因为如整定在欠补偿状态,切除线路将造成消弧线圈电容电流减少,可能出现全补偿或接近全补偿的情况。但是这种装置运行在过补偿状态当电网中发生了事故跳闸或重合等参数变化时脱谐度无法控制,以致往往运行在不允许的脱谐度下,造成中性点过电压,三相电压对称遭到破坏。
In the early stage of arc suppression coil, the fixed compensation system is called fixed compensation system. The working mode of the fixed compensation system is to set the arc suppression coil in the state of over compensation, and the degree of over compensation depends on that the neutral displacement voltage does not exceed 15% of the phase voltage during the normal and steady-state operation of the power grid. The reason why the over compensation is adopted is to avoid dangerous series resonance over-voltage when the power grid cuts off part of the lines. If the setting is in the under compensation state, cutting off the line will reduce the capacitance current of arc suppression coil, which may lead to full compensation or close to full compensation. However, in the state of over compensation, when the parameters such as accident trip or reclosing change in the power grid, the detuning degree can not be controlled, so that it often runs in the disallowed detuning degree, resulting in over-voltage at the neutral point, and the three-phase voltage symmetry is damaged.

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