消弧线圈并联高电阻接地方式的研究

文章对煤矿6kV电网电容日益增大的问题,提出电网中性点经消弧线圈与高电阻并联接地的方案。该方案既可全补偿运行,也可欠补偿运行。在接地保护装置动作的可靠性及抑制电弧接地过电压方面与单纯消弧线圈接地方式对比,显示该方案具有很多优点。文章对并联电阻值的计算及如何接入系统作了说明。

STUDY OF EARTHING BY CONNECTING ARC SUPPRESSING COIL IN PARALLEL WITH HIGH RESISTANCE

Owing to the unceasing growth of the capacitive current in mine 6kV network, the paper introduces a new method to earth the neutral-point via arc suppressing coil connected in parallel with high resistance. It can be applied either in full compensation or in deficient compensation. To compare with the earthing simply via arc suppressing coil, the reliability of the new method in activation of the earthing protection device and the suppression of over-voltage by earthing shows a lot of advantages. The paper also illustrates the computation of the value of the parallel resistor. and how the resistor is being connected in the system.