本科毕业论文-干式变压器温度控制的研究与设计.docVIP

学号： 常 州 大 学 毕业设计（论文） （2012届） 题 目 学 生 学 院 专业班级 校内指导教师 专业技术职务 校外指导老师 专业技术职务 二○ 干式变压器温度控制的研究与设计 摘 要：干式变压器的安全运行和使用寿命，很大程度上取决于变压器绕组绝缘的安全可靠。绕组温度超过绝缘耐受温度使绝缘破坏，是导致变压器不能正常工作的主要原因之一，因此对变压器的运行温度的监测及其报警控制是十分重要的。 关键字：干式变压器；温度控制；AD转换器PCF8591 Research and design of dry-type transformer temperature control Abstract：Safe operation and service life of dry-type transformers, depends largely on safety and reliability of the transformer winding insulation. Insulation`s damage which results from that the winding temperature exceeds the insulation`s max withstanding temperature, is one of the main reason leading to that the transformer can not work properly. Therefore, monitoring of the transformer`s operation temperature and alarm control are very important. This article is about a research and design of temperature control on the dry-type transformers. The design achieved temperature presetting, temperature acquisition, temperature display, over- temperature alarming and the related controlling. The designers choose AT89C52 as controller of the design. The designer regulates a sliding rheostat to preset temperature. Temperature acquisition is the detection of relevant signals through the NTC 5K which is transmitted to the controller. The conversion of the signal is completed by the AD converter PCF8591. The temperature display is done by LCD1602. The over-temperature alarming is controlled by a pin of the controller. However, due to cost consideration, the design doesn`t include the relevant control circuit. The control signal is analog display through the LCD screen. Key words: dry-type transformer; temperature control; the AD converter PCF8591 目 录 摘要···············