Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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直流分量對(duì)變壓器差動(dòng)保護(hù)影響的仿真分析

來(lái)源:電工電氣發(fā)布時(shí)間:2018-12-17 13:17 瀏覽次數(shù):588
直流分量對(duì)變壓器差動(dòng)保護(hù)影響的仿真分析
 
邵美才1,錢鋒1,何翠1,吳成立2
(1 國(guó)網(wǎng)浙江東陽(yáng)市供電有限公司,浙江 東陽(yáng) 322100;2 國(guó)網(wǎng)浙江安吉縣供電有限公司,浙江 安吉 313300)
 
    摘 要:介紹了幾種電力系統(tǒng)中產(chǎn)生直流分量的因素,設(shè)計(jì)了勵(lì)磁涌流產(chǎn)生模型與疊加直流分量的仿真模型,分析了直流分量對(duì)電流互感器(TA)暫態(tài)傳變特性的影響,并通過(guò)空載合閘投入變壓器同時(shí)流入直流分量的仿真,研究TA傳變異常對(duì)勵(lì)磁涌流判據(jù)的影響。研究結(jié)果表明,直流分量將改變TA 傳變特性,二次側(cè)電流波形發(fā)生畸變,對(duì)勵(lì)磁涌流閉鎖二次諧波制動(dòng)、間斷角等判據(jù)產(chǎn)生影響,易引起變壓器差動(dòng)保護(hù)誤動(dòng)。
    關(guān)鍵詞:電流互感器;勵(lì)磁涌流;直流分量;暫態(tài)飽和;差動(dòng)保護(hù)
    中圖分類號(hào):TM77     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2018)12-0021-06
 
Simulation and Analysis on Transformer Differential Protection Affected by Direct Current Component
 
SHAO Mei-cai1, QIAN Feng1, HE Cui1, WU Cheng-li2
(1 State Grid Zhejiang Dongyang Power Supply Co., Ltd, Dongyang 322100, China;
2 State Grid Zhejiang Anji Power Supply Co., Ltd, Anji 313300, China)
 
    Abstract: Introduction was made to several kinds of factors producing the direct current component in power system. This paper designed the model producing excitation surge current and the simulated model of superposition direct current component, and analyzed the impacts of transient state transmission transformer characteristic on current transformers.Via the simulation of the influx direct current component when no-load closing input the transformer, this paper studied on the impacts of current transformers transmission transformer abnormity on the criterion of excitation surge current. The research results show that the direct current component changes the characteristics of current transformers transmission transformer and the secondary side current waveforms are distorted, which will have impacts on the second harmonic brake and discontinuous angle criterion of excitation surge current shutting, to give rise to the transformer differential protection misoperation.
    Key words: current transformer; excitation surge current; direct current component; transient saturation; differential protection
 
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