本文選題：差動(dòng)保護(hù)　切入點(diǎn)：變壓器　出處：《中國(guó)電機(jī)工程學(xué)報(bào)》2014年04期

【摘要】：為進(jìn)一步提高勵(lì)磁涌流鑒別的速度及精度,尤其是快速檢測(cè)出帶故障合閘時(shí)的涌流,使該情況下保護(hù)的開放時(shí)間縮短至一個(gè)周期內(nèi),提出一種采用自適應(yīng)數(shù)據(jù)窗電流的勵(lì)磁涌流鑒別方法。該方法在時(shí)間軸上下分別設(shè)置閾值??,利用該閾值及某段采樣電流的極大值或極小值,確定出自適應(yīng)數(shù)據(jù)窗的起點(diǎn)及終點(diǎn);并在選取出的自適應(yīng)數(shù)據(jù)窗內(nèi),根據(jù)采樣間隔及數(shù)據(jù)窗長(zhǎng)度,以此極值向左向右虛擬出一條標(biāo)準(zhǔn)正弦曲線,計(jì)算出該正弦曲線與原采樣電流之間的相關(guān)系數(shù),進(jìn)而實(shí)現(xiàn)保護(hù)的閉鎖和開放。相比先前勵(lì)磁涌流鑒別方法,該方法能夠更大程度地區(qū)分出涌流及故障電流,在變壓器發(fā)生勵(lì)磁涌流時(shí),結(jié)合所提出的輔助加速閉鎖判據(jù),算法最遲在空載合閘后一個(gè)周期時(shí)閉鎖差動(dòng)保護(hù);在內(nèi)部故障時(shí)不誤閉鎖差動(dòng)保護(hù);還能在變壓器帶故障空載合閘時(shí),快速開放差動(dòng)保護(hù);且具有較強(qiáng)的抗互感器飽和能力。動(dòng)模試驗(yàn)驗(yàn)證了該方案的有效性及優(yōu)越性,在變壓器帶1.7%匝間短路故障空載合閘時(shí),算法于合閘后20 ms開放差動(dòng)保護(hù)。
[Abstract]:In order to further improve the speed and precision of inrush identification, especially the rapid detection of the fault of the closing current, so that the time of opening protection is shortened to a period, a self-adaptive data window current inrush current identification method. This method is set on the time axis respectively under the threshold?? the current sampling, threshold and a maximum or minimum value, to determine the starting point and end point adaptive data window; and the adaptive data window selected, according to the sampling interval and the length of data window, on the extreme left and right simulate a standard sine curve, calculate the sine curve with the original sample the correlation coefficient between the current, so as to realize the protection of the locking and opening. Compared with previous inrush identification methods, this method can better discriminate between inrush and fault current in transformer excitation occurs The magnetic inrush current, auxiliary acceleration blocking criterion combined with the proposed algorithm, the latest in a period when no-load closing after locking differential protection; in the internal fault not maloperation of differential protection; also with fault in the transformer no-load closing, fast open differential protection; and has strong anti transformer saturation capacity. Model test to verify the validity and superiority of the scheme, with 1.7% in transformer interturn short circuit fault when no-load closing, closing algorithm to the open differential protection after 20 ms.

【作者單位】： 東南大學(xué)電氣工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(50977012,51377022)~~
【分類號(hào)】：TM774

【參考文獻(xiàn)】

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本文編號(hào)：1688385