The authors have developed an accurate but simple method to estimate the temperature rise (referred to as "rise" hereafter) of a bushing conductor under any load condition. This method consists of one equation and two predetermined rise profiles F/sub 1/(z) and F/sub 2/(z). F/sub 1/(z) is the incremental rise profile at the rated current and F/sub 2/(z) is the normalized rise profile at zero current. F/sub 1/(z) and F/sub 2/(z) can be obtained from two base thermal tests. The proposed method allows estimation of the rise profile of the bushing under any given load condition. Therefore the rise and the location of the hottest spot can be determined from this profile. They have successfully applied this method to various bushings, such as bushings with and without oil circulation, bottom connected and draw-lead connected bushings and some special bushings with two conductors. They examined this method with a thermal circuit model and verified that the thermal model supports the new method.
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机译：作者已经开发出一种精确而简单的方法来估算在任何负载条件下套管导体的温度升高（以下称为“升高”）。该方法由一个方程式和两个预定的上升曲线F / sub 1 /（z）和F / sub 2 /（z）组成。 F / sub 1 /（z）是额定电流下的增量上升曲线，F / sub 2 /（z）是零电流下的标准化上升曲线。 F / sub 1 /（z）和F / sub 2 /（z）可以从两个基本的热测试中获得。所提出的方法允许在任何给定的载荷条件下估计衬套的上升轮廓。因此，可以从该轮廓确定最热点的上升和位置。他们已成功地将此方法应用于各种套管，例如带和不带油循环的套管，底部连接和引出线连接的套管以及一些带有两个导体的特殊套管。他们用热电路模型检查了该方法，并验证了该热模型支持该新方法。
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