【作者】 魏晓惠；

【导师】 张晓龙；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 由于牵引供电系统负载变化频繁，电流、电压波动幅度大，一次侧负序分量大，牵引变压器等供变电设备的运行环境比较恶劣。 牵引变压器是牵引供电系统中最重要的设备之一，它的正常工作与否直接关系到电气化铁道的正常运营。因此，采用各种测试手段了解牵引变压器的性能参数，及时发现问题，避免由于牵引变压器故障造成的运营事故，具有重要的意义。牵引变压器的选择是人们长期关心的问题之一。采用斯科特变压器、平衡变压器等特殊接线方式变压器作为主变压器，能有效抑制负序电流，减少有功损耗和电压损失，提高牵引机车的过负载能力。 变压比是变压器的重要参数，变压比的变化与变压器绕组的变化有密切的关系。但由于此类变压器采用特殊的接线方式，通常所用的变压器变压比测试仪不能直接运用于此类变压器的变比测试，所以有必要研究一种新型的用于特殊接线方式变压器的变比测试仪。 本论文在分析了此类变压器特殊接线方式的基础上，研究了其变压比测试的原理，并最终设计了可用于测试斯科特变压器、逆斯科特变压器和平衡变压器等特殊接线方式变压器的变压比测试仪。在本论文中，围绕此类变压器变压比测量的原理和实现，详细讲述了测试仪的总体设计以及软硬件具体设计方案。最后对系统的整体性能进行了简要分析，介绍了系统的调试方法，并定性分析了系统干扰的来源和抑制方法。更多还原

【Abstract】 It is well known that the transformer is one of the most important equipments in traction substation and its operation condition greatly influences the safety of traction power supply system. Therefore it is very effective to get the operational parameters of transformer by kinds of testing methods and reduce the disk of expensive failures caused by transformer.In China the traction power supply system adopts single-phase AC. In AT power supply system some transformers with special connection mode, such as Scott transformer, Anti-Scott transformer, balance transformer and so on, are usual used.The voltage ratio is one of important parameters of transformer. It relates to the status of transformer winding. The variety of voltage ratio reacts to not only the insulation status of transformer winding but also the fault of winding short. The deterioration of voltage ratio may result in damage of transformer, which may also lead to the failures of power supply system. Therefore it is valuable to study on the method for measuring voltage ratio of special transformer. Since these transformers have special connection mode, the apparatus used for common transformer cannot directly measure the voltage ratio. It is very necessary to develop a novel apparatus especially used for these special transformers.In this thesis, a novel voltage ratio measuring system for special transformer is introduced. The principle and design realization of the system is discussed in detail, including the whole structure, the principles of main modules, and the design of the hardware and software. In the end, the performances of the whole device are tested and the errors are analyzed. The microprocessor ATMEL AT89C55 is adopted as the center of the system, and the system is based on the design idea of system-on-a-chip.更多还原