Circulating the dielectric oil helps to keep  the temperature within the pipe consistent along the line, but can't control how that average  temperature changes over time.

循环介电油有助于保持管道内的温度沿线一致，但无法控制平均温度随时间的变化。

At each end of the  transmission line is a plant filled with pumps and tanks to pressurize - and often to  circulate - the dielectric oil in the pipe.

输电线路的每一端都有一个装有泵和储罐的设备，用于对管道中的介电油加压并经常进行循环。