Heat analysis of the power transformer bushings in the transient and steady states considering the load variations
Heat analysis of the power transformer bushings in the transient and steady states considering the load variations
复制标题
考虑负载变化的电力变压器套管瞬态和稳态热分析
DOI：
10.1016/j.applthermaleng.2017.05.004
复制
发表时间：
2017
影响因子：
6.4
通讯作者：
Rashid Mahmoodian
中科院分区：
文献类型：
--
作者：
M. Akbari;Mehdi Allahbakhshi;Rashid Mahmoodian
套管是电力变压器的主要部件之一。这是因为套管的可靠和高效性能对变压器的可靠性有很大的影响，而变压器又是电力系统的基本组成部分。作为功率耗散的结果，衬套的热性能显著影响衬套的性能和设计。本文提出了一种新的轴套热分析算法。该算法旨在确定热点温度和衬套的温度分布。因此，用焦耳加热方程作为瞬态和稳态的偏微分方程来表述该问题。然后，采用有限元法对该问题进行求解。该算法在浸渍纸衬套上实现。在稳态下，确定了整个衬套的温度分布。此外，还研究了不同电流对热点温度位置和大小的影响。在暂态下，模拟了三种过载场景，其中两种来自IEEE C57.19.100和IEC 60076-7标准。此外，还研究了风速和电负荷对48h内衬套温度分布的影响。
Bushings are considered as one of the main components of the power transformers. This is due to the fact that the reliable and efficient performance of the bushings significantly influences the reliability of the transformers which, in turn, are counted as the fundamental part of the power systems. The thermal behaviour of the bushings, as a consequence of the power dissipation, significantly affects the bushing’s performance and design. In this paper, a novel algorithm is proposed for the heat analysis of the bushings. This algorithm aims at specifying the hot spot temperature and the temperature distribution of the bushing. Therefore, the problem is formulated using the Joule Heating equations as the partial differential equations for both transient and steady states. Then, the finite element method is employed to solve the problem. The algorithm is implemented on an oil-impregnated paper bushing. In the steady state, the temperature distribution of the whole bushing is determined. In addition, the effects of different currents on the location and magnitude of the hot spot temperature have been investigated. In the transient state, three overload scenarios are simulated two of which are from the IEEE C57.19.100 and IEC 60076-7 standards. In addition, the effects of the wind speed and electric load on the bushing’s temperature distribution for 48 h have been investigated.