Investigation of Transformer Reactive Power and Temperature Increases Under DC
Investigation of Transformer Reactive Power and Temperature Increases Under DC
复制标题
直流条件下变压器无功功率和温升的研究
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
C. T. Gaunt
中科院分区：
文献类型：
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作者：
S. Mkhonta;T. T. Murwira;D. Oyedokun;K. Folly;C. T. Gaunt
受地磁感应电流（GIC）影响的变压器无功功率消耗和温升增加。进行了实验室测试，以确定三相三柱（3p3L）实验室实验台规模（300 VA）Transformer的无功功率消耗曲线。结果表明，传统测量的无功功率消耗和直流电平之间的线性关系。还使用了考虑直流暴露下失真的无功功率计算的通用功率理论（GPT），与传统方法相比，无功功率增加更大。进一步的结果表明，由于线电流的增加，绕组的表面温度比芯柱的表面温度增加更高。本研究是对3p3L变压器GIC响应的广泛研究的一部分，其结果将有助于改进用于GIC研究的有限元法（FEM）模型。
Transformers subjected to Geomagnetically Induced Current (GIC) exhibit increased reactive power consumption and temperature rise. Laboratory tests were conducted to identify the reactive power consumption profiles of a three-phase three-limb (3p3L) laboratory bench-scale (300 VA) transformer. The results showed a linear relationship between the conventionally measured reactive power consumed and the level of dc. A General Power Theory (GPT) for reactive power calculation considering distortions under dc exposure was also used, showing greater increase in reactive power compared to the conventional approach. Further results showed higher surface temperature increases in the windings compared to the core limbs due to increased line currents. This research is part of an extensive study of the response of 3p3L transformers to GIC, which results will assist in improving Finite Element Method (FEM) models used for GIC studies.