主变差动保护带负荷测试软件的设计与开发

发布时间：2018-12-11 13:20

【摘要】：变压器在电力系统中担负着转换电压等级的任务。差动保护作为变压器的主保护,能在第一时间反映故障并做出判断选择跳闸,从而切除故障,保证变压器的正常运行。差动保护的算法具有多样性,包含了纵联差动、分相差动、分侧差动、零序差动、小区差动。一方面,不同的差动保护,使用不同的CT组合进入差动电流计算,对应着不同的保护范围,这要求各个CT回路的绝对正确,使得主变投运时的带负荷测试至关重要,另一方面,各个保护装置厂家对于每一类差动保护都存在不同的理解,有不同的算法,因此,在现场带负荷实验时,算法的差异与计算的难度为现场工作人员的计算和理解带来极大困难。文章通过对电力系统故障时电流电压特征量的分析,介绍了变压器的各类保护,以及不同故障情况下对应的保护配置。接着详细讨论了变压器各类差动保护的构成、CT使用情况、相位转角原理、幅值平衡方法等。通过理解总结,明确了各个保护装置厂家对于各类保护原理及算法的理解,同时也通过分析得到了开发软件的理论基础。之后,文章还介绍了主变差动保护带负荷测试软件的开发过程,展示了软件的部分程序框图,并介绍了程序的使用方法。最后,利用220k V双桥子变电站主变带负荷测试的一次实际数据,对软件进行测试,验证系统的完整性和正确性。经过分析与测试表明,主变差动保护带负荷测试软件的开发,将有利用现场作业人员快速、高效的查找故障点,具有很强现场实用性,文末并指出,开发出能够在便携设备上使用的带负荷测试程序,将更加方便现场应用。
[Abstract]:Transformer is responsible for converting voltage grade in power system. As the main protection of the transformer, the differential protection can reflect the fault in the first time and make the judgment and choose tripping to remove the fault and ensure the normal operation of the transformer. The algorithm of differential protection is diverse, including longitudinal differential, sub-phase, side differential, zero-sequence differential, and cell differential. On the one hand, different differential protection uses different CT combination to enter differential current calculation, corresponding to different protection range, which requires every CT circuit to be absolutely correct, which makes the load test of main transformer in operation very important, on the other hand, Each protective device manufacturer has different understanding and algorithm for each kind of differential protection. Therefore, in the field experiment with load, the difference of algorithm and the difficulty of calculation bring great difficulty to the calculation and understanding of field workers. By analyzing the characteristics of current and voltage in power system faults, this paper introduces various types of protection of transformers and the corresponding protection configurations under different fault conditions. Then, the composition of transformer differential protection, the use of CT, the principle of phase rotation angle, the method of amplitude balance and so on are discussed in detail. By means of understanding and summing up, the understanding of all kinds of protection principles and algorithms is clarified, and the theoretical basis of developing software is also obtained through analysis. After that, the paper also introduces the development process of the load test software for the main transformer differential protection, shows some program block diagrams of the software, and introduces the application method of the program. Finally, the software is tested by using the actual data of 220kV double bridge substation main transformer belt load test to verify the integrity and correctness of the system. The analysis and test results show that the development of load testing software for differential protection of main transformer will make use of field operators to find fault points quickly and efficiently, which is very practical on the spot. At the end of this paper, it is pointed out that, It will be more convenient for field application to develop a load test program which can be used on portable equipment.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM773

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