The loss of the transformers accounts for largish proportion in the loss of the power system , so realizing economical operation of transformers is one of the effective measure to readuce loss and save energy . but from existing status of this field , how to effectively realize economical operation of transformers has not been done very well . this dissertation main researches how to effectively actualize on - line economical operation of transformers base on the existing scada system and equipments of the area power network 在电力网损中变压器的损耗占有相当大的比例，故实现变压器经济运行是降低网损、节约能源的有效手段之一。但综合国内外的研究现状，如何有效地实施变压器经济运行还没有得到很好解决。本文着重研究了在地区电网现有的scada系统和设备上实现在线变压器经济运行的解决方法。
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Among other monstrosities in this lumber room was a largish blackjapanned box , excellently and ingeniously made some sixty or seventy years ago , and fitted with every imaginable object . on top was a concentrated toilet set : brushes , bottles , mirrors , combs , boxes , even three beautiful little razors in safety sheaths , shaving - bowl and all 在这旧物贮藏室堆积着的许多离奇古怪的东西中，有一日黑漆的大箱子，做得非常巧妙，这是六七十年前的东西，里面安排着各种各样的物件，上面是一些梳妆用品刷子瓶子镜子梳子小盒子甚至三个精致的保险小剃刀肥皂确和一切刮脸用品。
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The box beam ' s temperature stress of longitudinal direction and transverse direction with different conformation are analyzed , it finds that there is largish temperature tensile stress in the bottom of top deck and the haunch of box beam increase temperature tensile stress in the bottom of top deck . the paper makes a study of different thermal effects resulted from several kinds of closed rigid frame 根据大量实测温度场结果建议采用一个有利于理论推导的指数函数的公式来拟和箱梁体内的温差分布，既贴近实测数值，计算又比较简单；通过对空腹式刚架拱桥尤溪洲大桥所在地夏季、秋季、冬季的温度场及温度应力的实测，以及与本文所提出计算方法的理论解进行的分析比较，证实了本文计算方法的正确，同时改进了已往混凝土箱梁温度自应力的计算方法。
