220kV主变压器中性点加装隔直电容对零序电量的影响

发布时间：2018-06-06 18:25

本文选题：直流偏磁 + 中性点接地　；参考：《电力系统自动化》2014年01期

【摘要】：变压器中性点加装隔直电容是抑制直流偏磁的有效措施,但加装隔直电容后系统零序参数将发生改变,且大规模加装隔直电容后对零序电量的影响是否存在叠加效应未有明确定论。文中建立了220kV复杂系统环形等值模型,考虑不同运行工况进行计算仿真,采用继电保护智能整定计算软件进行全网故障计算,验证大规模加装隔直电容时系统所受的影响情况。研究结果表明,加装隔直电容后对线路保护安装处零序电流及电压保护影响很小,对加装站点变压器中性点零序电流的影响最大,大规模加装隔直电容时存在叠加效应,但叠加后对相关零序保护的影响基本可以忽略。
[Abstract]:It is an effective measure to restrain DC bias magnetic field by adding straight capacitance to the neutral point of transformer, but the zero sequence parameters of the system will be changed after the direct capacitance is installed. Whether there is superposition effect on zero sequence electric quantity after large-scale straight capacitor installation is not clear. In this paper, the ring equivalent model of 220 kV complex system is established, and the calculation simulation is carried out under different operating conditions, and the fault calculation of the whole network is carried out by using the intelligent setting calculation software of relay protection, which verifies the influence of the system when the direct capacitance is installed on a large scale. The results show that the zero sequence current and voltage protection at the line protection installation are affected very little by the direct capacitance, and the zero sequence current at the neutral point of the transformer is the most important one, and the superposition effect exists when the straight capacitor is installed on the large scale. However, the effect of superposition on the zero sequence protection can be neglected.
【作者单位】：华南理工大学电力学院;广东电网公司电力调度控制中心;
【基金】：国家自然科学基金资助项目(51377059) 广东省自然科学基金资助项目(S2013010012885)~~
【分类号】：TM41

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