Abstract: A total scheme of new auto-switching equipment for economic operation of power transformer is presented in this paper.Its hardware design，operation principle and the method of short-term load forecast method of periodical auto-regression model are introduced.Short-term load forecasting method is adopted to solve the problem of frequent input and retreat of transformer under the load undulation when implementing the economic operation control.Flexible auto-switching of transformer economic operation is realized by using programmable logic technology，it also satisfies the requirement of standby power supply auto-switching.Practical operation shows the given arithmetic and developed device in this paper achieve forecast aim and obtain good applicative effectiveness.

摘要： 提出了一种新型的基于负荷预测的变压器经济运行自动投切装置整体解决方案，介绍了该装置的软硬件设计、工作原理、周期自回归模型的短期负荷预测方法。利用短期负荷预测方法解决变压器在负荷波动情况下实施经济运行控制面临的频繁投退问题。采用可编程逻辑的设计思想实现了变压器经济运行自动投切，同时还满足备用电源自动投入功能。经现场实际运行表明，给出的算法和研制的装置，达到了预期目标并取得良好的使用效果。