本文選題：小電流接地系統(tǒng) + 消弧線圈��； 參考：《遼寧工程技術(shù)大學(xué)》2014年碩士論文

【摘要】：我國(guó)3～66kV供電系統(tǒng)主要以小電流接地方式為主,利用中性點(diǎn)非有效接地的特點(diǎn),減小單相接地時(shí)造成的危害。小電流接地系統(tǒng)發(fā)生單相接地故障時(shí),由于接地電流較小故障特征微弱而且受環(huán)境噪聲等外界干擾影響較大,易造成選線誤判。近些年很多學(xué)者對(duì)小電流系統(tǒng)接地故障做了大量的深入研究,提出了很多選線判據(jù),但是實(shí)際的應(yīng)用效果并不理想,這嚴(yán)重制約著我國(guó)供電系統(tǒng)智能化的發(fā)展。隨著安全生產(chǎn)對(duì)供電可靠性要求的逐步提高,亟待提出一種準(zhǔn)確可靠的選線方法。本文詳細(xì)分析了小電流接地系統(tǒng)單相接地故障的特性,分別對(duì)中性點(diǎn)不接地系統(tǒng)、中性點(diǎn)經(jīng)高阻接地系統(tǒng)和中性點(diǎn)經(jīng)消弧線圈接地系統(tǒng)發(fā)生故障時(shí)的零序特征量進(jìn)行了研究,重點(diǎn)分析了在不同接地系統(tǒng)中零序電壓和零序電流的相位關(guān)系。根據(jù)零序參數(shù)的特征,本文應(yīng)用“零序無功+有功功率”算法實(shí)現(xiàn)小電流接地選線,并以MATLAB為平臺(tái)搭建供電系統(tǒng)模型,進(jìn)行單相接地故障仿真。選擇性漏電保護(hù)器的硬件電路以16位單片機(jī)MC9S12XS128MAA為控制核心,數(shù)據(jù)處理能力強(qiáng),內(nèi)置12位AD轉(zhuǎn)換器,簡(jiǎn)化外圍電路。為了克服小電流系統(tǒng)接地故障時(shí)零序特征量幅值變化范圍大、檢測(cè)困難的問題,加入程控放大器,提高檢測(cè)靈敏度,擴(kuò)大檢測(cè)范圍。試驗(yàn)證明,該方案可有效提高選擇性漏電保護(hù)器的可靠性和靈敏性。
[Abstract]:The main mode of 3~66kV power supply system in our country is small current grounding, and the harm caused by single-phase grounding is reduced by using the characteristics of non-effective neutral grounding. When a single-phase grounding fault occurs in a low-current grounding system, it is easy to misjudge the line selection due to the weak fault characteristics of the grounding current and the strong influence of environmental noise and other external interference. In recent years, many scholars have done a lot of in-depth research on the ground fault of small current system, and put forward many criteria of line selection, but the actual application effect is not ideal, which seriously restricts the development of intelligent power supply system in China. With the improvement of reliability requirement of power supply in safety production, it is urgent to put forward an accurate and reliable route selection method. In this paper, the characteristics of single-phase grounding fault of small current grounding system are analyzed in detail. The zero sequence characteristic quantities of neutral point ungrounded system, neutral point grounding system through high resistance and neutral point grounding system through arc-suppression coil are studied respectively. The phase relationship between zero sequence voltage and zero sequence current in different grounding systems is analyzed. According to the characteristics of zero-sequence parameters, this paper applies the "zero-sequence reactive power" algorithm to realize the low-current grounding line selection, and builds the power supply system model based on MATLAB to simulate the single-phase grounding fault. The hardware circuit of the selective leakage protector is based on 16-bit single-chip computer (MC9S12XS128MAA), which has strong data processing ability and 12 bits AD converter, which simplifies the peripheral circuit. In order to overcome the problem that the amplitude of zero sequence characteristic quantity changes in large range and it is difficult to detect the ground fault of small current system, the program control amplifier is added to improve the detection sensitivity and expand the detection range. The test results show that this scheme can effectively improve the reliability and sensitivity of the selective leakage protector.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862;TM564.8

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