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首页> 外文期刊>Electric Power Components and Systems >Study and Analysis of the Effect of Harmonics on the Hot Spot Temperature of a Distribution Transformer Using Finite-Volume Method
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Study and Analysis of the Effect of Harmonics on the Hot Spot Temperature of a Distribution Transformer Using Finite-Volume Method

机译：有限体积法研究和分析谐波对配电变压器热点温度的影响

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摘要

Transformers are critical components in power systems and their failure can cause long interruption of power supply. The condition of a transformer can be monitored by performing thermal analysis. The use of non-linear devices, such as rectifiers and converters, draws harmonic currents that increase losses in transformers, thereby increasing their operating temperature. In this article, a new numerical approach is presented for determining the rise in hot spot temperature in a 5-kVA, 400/400-V dry-type three-phase transformer laboratory prototype. The key novelty is that the additional winding eddy current loss due to non-linear loads is considered in the numerical modeling. The winding eddy current loss corresponding to harmonic distortion is estimated by conducting experiments and calculations. Numerical simulations are carried out for a wide range of non-linear loads using a commercial computational fluid dynamics package, FLUENT 6.3. The proposed numerical methodology is validated by performing experiments on the transformer for possible non-linear loads and comparing the measured hot spot temperature with the simulated values. Correlation equations for rise in hot spot temperature as a function of total harmonic distortion are presented, which can be used for estimating the life of transformers when connected to different types of loads.
机译：变压器是电力系统中的关键组件，其故障会导致电源长时间中断。可以通过执行热分析来监视变压器的状态。使用非线性设备（例如整流器和转换器）会吸收谐波电流，这会增加变压器的损耗，从而提高变压器的工作温度。在本文中，提出了一种新的数值方法来确定5 kVA，400 / 400-V干式三相变压器实验室原型中热点温度的升高。关键的新颖之处在于，在数值模型中考虑了由于非线性负载而导致的附加绕组涡流损耗。通过进行实验和计算，可以估算出与谐波畸变相对应的绕组涡流损耗。使用商业计算流体动力学软件包FLUENT 6.3，可以对各种非线性负载进行数值模拟。通过在变压器上进行可能的非线性负载实验，并将测得的热点温度与模拟值进行比较，验证了所提出的数值方法的有效性。提出了热点温度升高与总谐波失真的函数的相关方程式，该方程式可用于估算连接到不同类型负载时的变压器寿命。

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