發(fā)布時(shí)間：2018-06-06 17:22

  本文選題：多類型電流互感器物理模型 + 混聯(lián)運(yùn)行方式��； 參考：《中國電力科學(xué)研究院》2017年碩士論文

【摘要】：本文在分析不同類型電流互感器暫、穩(wěn)態(tài)特性差異的基礎(chǔ)上,研制了電子式電流互感器、TPY級電流互感器及5P級電流互感器的物理模型,在此基礎(chǔ)上搭建多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試平臺,研究了多類型電流互感器混聯(lián)運(yùn)行特性,從P級電流互感器飽和特性以及不同電流互感器“拖尾”電流特性差異兩方面分析了電流互感器混聯(lián)運(yùn)行對差動(dòng)保護(hù)的影響,并提出了相應(yīng)的應(yīng)對措施。首先,本文從理論上分析了不同類型電流互感器特性之間的差異,調(diào)研工程現(xiàn)場不同類型電流互感器混聯(lián)運(yùn)行方式,研究多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試技術(shù),研制與實(shí)際電流互感器等效的電磁型電流互感器(包括P級與TPY級)和電子式電流互感器模型,對多類型電流互感器物理模型的關(guān)鍵參數(shù)進(jìn)行測試,分析結(jié)果表明物理模型的參數(shù)與工程用電流互感器的參數(shù)具有較好的一致性。并在此基礎(chǔ)上搭建了線路保護(hù)用的多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試系統(tǒng)、變壓器保護(hù)用的多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試系統(tǒng)及母線保護(hù)用的多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試系統(tǒng)。其次,以線路保護(hù)多類型電流互感器混聯(lián)運(yùn)行動(dòng)模測試系統(tǒng)為例,模擬線路區(qū)內(nèi)、外故障,用MATHCAD軟件基于傅氏算法對故障錄波進(jìn)行處理分析,并從諧波和非周期分量兩方面研究了電磁型電流互感器在正常傳變、輕微飽和及嚴(yán)重飽和三種運(yùn)行工況下與其他兩種電流互感器傳變特性的差異,得出P級電流互感器不同飽和程度下,傳變二次電流中諧波含量及非周期分量的變化規(guī)律。最后,結(jié)合動(dòng)模測試波形分析了基于多類型電流互感器混聯(lián)運(yùn)行的差動(dòng)保護(hù)動(dòng)作特性,在電磁型電流互感器正常傳變、輕微飽和及嚴(yán)重飽和三種運(yùn)行工況下,分析了混聯(lián)運(yùn)行情況的差動(dòng)電流與制動(dòng)電流曲線,以及差動(dòng)保護(hù)比率特性。研究表明當(dāng)電流互感器飽和時(shí)間小于5ms時(shí),差動(dòng)保護(hù)裝置存在誤動(dòng)風(fēng)險(xiǎn)。本文從避免電流互感器發(fā)生嚴(yán)重飽和、提升差動(dòng)保護(hù)裝置識別嚴(yán)重飽和判據(jù)及避免不同電流互感器“拖尾”電流差異對差動(dòng)保護(hù)影響三方面出發(fā),采取相應(yīng)措施,以減小混聯(lián)運(yùn)行引起差動(dòng)保護(hù)誤動(dòng)風(fēng)險(xiǎn),相關(guān)改進(jìn)措施在動(dòng)模測試平臺上得到了試驗(yàn)驗(yàn)證。
[Abstract]:On the basis of analyzing the difference of transient and steady state characteristics of different types of current transformers, the physical models of TPY current transformers and 5p current transformers of electronic current transformers are developed in this paper. On the basis of this, the test platform of multi-type current transformers is built, and the characteristics of multi-type current transformers are studied. The effect of mixed operation of current transformer on differential protection is analyzed from two aspects: saturation characteristic of P class current transformer and difference of current characteristic of different current transformer. First of all, this paper theoretically analyzes the differences between the characteristics of different types of current transformers, investigates the mixed operation modes of different types of current transformers, and studies the test technology of multi-type current transformers' combined transport operation model. The electromagnetic current transformer (including P class and TPY level) and the electronic current transformer model are developed, which are equivalent to the actual current transformer. The key parameters of the physical model of the multi-type current transformer are tested. The results show that the parameters of the physical model are in good agreement with those of the engineering current transformer. On this basis, a multi-type current transformer combined transport model test system for line protection is built. The multi-type current transformer combined transport model test system for transformer protection and the multi-type current transformer combined transport action model test system for busbar protection. Secondly, taking the line protection multi-type current transformer combined transport model test system as an example, simulates the fault in the line area and outside, uses MATLAB software based on the Fourier algorithm to deal with the fault recording. The difference between electromagnetic current transformer and other two current transformers under normal, slight saturation and severe saturation is studied in terms of harmonic and aperiodic components. The variation law of harmonic content and aperiodic component in secondary current is obtained under different saturation degree of P-level current transformer. Finally, combined with the dynamic mode test waveform, the differential protection operation characteristics based on the mixed operation of multi-type current transformers are analyzed. Under three operating conditions of electromagnetic current transformers, such as normal transmission, slight saturation and severe saturation, the characteristics of differential protection are analyzed. The curve of differential current and braking current and the characteristic of differential protection ratio are analyzed. When the saturation time of the current transformer is less than 5ms, the differential protection device is at risk of misoperation. In this paper, measures are taken to avoid serious saturation of current transformer, to identify serious saturation criterion of differential protection device and to avoid the effect of "trailing" current difference of different current transformer on differential protection. In order to reduce the misoperation risk of differential protection caused by mixed operation, the related improvement measures are verified by test on the dynamic model test platform.
【學(xué)位授予單位】：中國電力科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM452;TM773

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