發(fā)布時(shí)間：2018-01-17 21:30

  本文關(guān)鍵詞：電力變壓器勵(lì)磁涌流識(shí)別新方法研究　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 波形奇異因子 正弦波相似因子 標(biāo)準(zhǔn)化漏感 勵(lì)磁涌流 內(nèi)部故障電流

【摘要】：如何防止變壓器勵(lì)磁涌流導(dǎo)致的差動(dòng)保護(hù)誤動(dòng)作和提高空投于故障變壓器(特別是匝間短路)時(shí)保護(hù)的靈敏度是變壓器差動(dòng)保護(hù)先天性的、不可回避的難題。論文針對(duì)該問題展開工作,提出了相應(yīng)的解決措施,研究的主要內(nèi)容和成果有： 提出了一種利用波形奇異因子辨別變壓器內(nèi)部故障和勵(lì)磁涌流的新方法。首先定義了波形奇異因子及其計(jì)算方法,并揭示了勵(lì)磁涌流和內(nèi)部故障情況下,波形奇異因子不同的變化趨勢(shì)。在此基礎(chǔ)上,給出了勵(lì)磁涌流和內(nèi)部故障識(shí)別判據(jù)。動(dòng)模試驗(yàn)驗(yàn)證結(jié)果表明,即使是發(fā)生小匝比匝間故障的情況下,該方法也能快速、準(zhǔn)確、可靠的區(qū)分內(nèi)部故障與勵(lì)磁涌流,計(jì)算量小,易于工程實(shí)現(xiàn)。 提出了一種基于正弦波相似因子識(shí)別變壓器勵(lì)磁涌流和內(nèi)部故障電流的新方法。首先給出了正弦波相似因子的定義及其計(jì)算方法,然后根據(jù)正弦波相似因子在勵(lì)磁涌流和故障電流情況下不同的變化趨勢(shì),提出了新的識(shí)別判據(jù)。動(dòng)模試驗(yàn)結(jié)果表明,勵(lì)磁涌流的正弦波相似因子維持在很小的數(shù)值,而故障電流的正弦波相似因子則有明顯的變化,該方法能夠快速切除變壓器內(nèi)部故障,識(shí)別靈敏度高,計(jì)算簡(jiǎn)單,易于實(shí)施。 提出了一種利用標(biāo)準(zhǔn)化漏電感識(shí)別勵(lì)磁涌流和故障電流的新方法。該方法利用正常條件下變壓器的電阻和漏感參數(shù),通過差分方程遞推變壓器空載合閘時(shí)的漏感值,在此基礎(chǔ)上標(biāo)準(zhǔn)化漏電感參數(shù),以使保護(hù)裝置參數(shù)設(shè)置更具普遍性。動(dòng)模試驗(yàn)結(jié)果表明,該方法不受變電站中變壓器母線側(cè)TV安裝位置影響,并可確保內(nèi)部故障時(shí)變壓器能夠被可靠地快速切除,且該方法對(duì)輕微故障具有足夠的靈敏度。
[Abstract]:How to prevent the maloperation of differential protection caused by inrush current of transformer excitation and how to improve the sensitivity of protection when the fault transformer (especially the inter-turn short circuit) is dropped by air is congenital of transformer differential protection. The paper works on this problem and puts forward the corresponding solutions. The main contents and results of the study are as follows: A new method for distinguishing internal faults and inrush currents of transformers by waveform singularity factor is proposed. Firstly, the waveform singularity factor and its calculation method are defined, and the excitation inrush current and internal faults are revealed. On the basis of this, the inrush current and internal fault identification criteria are given. The results of dynamic simulation test show that even in the case of small turn ratio inter-turn fault. This method can also be used to distinguish internal faults from excitation inrush currents quickly, accurately and reliably, and it is easy to be realized in engineering. A new method for identifying inrush current and internal fault current of transformer based on sinusoidal similarity factor is proposed. Firstly, the definition of sinusoidal similarity factor and its calculation method are given. Then according to the different trends of sinusoidal wave similarity factor under excitation inrush current and fault current, a new identification criterion is proposed. The sinusoidal wave similarity factor of excitation inrush current is maintained at a very small value while the sinusoidal wave similarity factor of fault current has obvious changes. This method can quickly remove the internal fault of transformer and has high sensitivity. The calculation is simple and easy to implement. A new method for identifying inrush current and fault current by using standardized leakage inductance is presented, which utilizes the resistance and leakage inductance parameters of transformer under normal conditions. Through the difference equation recursion transformer leakage inductance value when no load switch, on this basis standardization leakage inductance parameter, in order to make the protection device parameter set more universal. The dynamic simulation test results show. This method is independent of the transformer busbar side TV installation position in the substation, and can ensure that the transformer can be removed reliably and quickly in case of internal fault, and the method has sufficient sensitivity for minor faults.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM41

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