【摘要】：變壓器在電力系統(tǒng)中擔負著轉(zhuǎn)換電壓等級的任務(wù)。差動保護作為變壓器的主保護,能在第一時間反映故障并做出判斷選擇跳閘,從而切除故障,保證變壓器的正常運行。差動保護的算法具有多樣性,包含了縱聯(lián)差動、分相差動、分側(cè)差動、零序差動、小區(qū)差動。一方面,不同的差動保護,使用不同的CT組合進入差動電流計算,對應著不同的保護范圍,這要求各個CT回路的絕對正確,使得主變投運時的帶負荷測試至關(guān)重要,另一方面,各個保護裝置廠家對于每一類差動保護都存在不同的理解,有不同的算法,因此,在現(xiàn)場帶負荷實驗時,算法的差異與計算的難度為現(xiàn)場工作人員的計算和理解帶來極大困難。文章通過對電力系統(tǒng)故障時電流電壓特征量的分析,介紹了變壓器的各類保護,以及不同故障情況下對應的保護配置。接著詳細討論了變壓器各類差動保護的構(gòu)成、CT使用情況、相位轉(zhuǎn)角原理、幅值平衡方法等。通過理解總結(jié),明確了各個保護裝置廠家對于各類保護原理及算法的理解,同時也通過分析得到了開發(fā)軟件的理論基礎(chǔ)。之后,文章還介紹了主變差動保護帶負荷測試軟件的開發(fā)過程,展示了軟件的部分程序框圖,并介紹了程序的使用方法。最后,利用220k V雙橋子變電站主變帶負荷測試的一次實際數(shù)據(jù),對軟件進行測試,驗證系統(tǒng)的完整性和正確性。經(jīng)過分析與測試表明,主變差動保護帶負荷測試軟件的開發(fā),將有利用現(xiàn)場作業(yè)人員快速、高效的查找故障點,具有很強現(xiàn)場實用性,文末并指出,開發(fā)出能夠在便攜設(shè)備上使用的帶負荷測試程序,將更加方便現(xiàn)場應用。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM773

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本文編號：2372621