本文選題：單行自動重合閘 + 潛供電流�。� 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：我國超高壓同塔雙回輸電線路在系統(tǒng)發(fā)生單相接地瞬時性故障時,通常采用單向自動重合閘的操作方式,來保證電力系統(tǒng)的穩(wěn)定性和可靠性。故障點的潛供電弧能否及時熄滅很大程度上決定了單相重合閘的成功與否。潛供電弧的兩個重要參數(shù)是潛供電流和恢復(fù)電壓,有必要對其特性進行研究,并采取合理有效的抑制措施,以提高重合閘的成功率。本文首先采用了集中參數(shù)法和分布參數(shù)法對潛供電流和恢復(fù)電壓進行理論推導(dǎo)與分析,得出其主要由容性分量和感性分量構(gòu)成,由得到的數(shù)學(xué)表達式可知潛供電流的容性分量與線路長度呈正比關(guān)系,亦隨著線路的相間電容的增大而增大,潛供電流的感性分量與線路故障的發(fā)生點密切相關(guān),并呈一定的規(guī)律性,在線路兩端數(shù)值相等方向相反�；謴�(fù)電壓的容性分量僅僅與線路的電壓和電容有關(guān),線路的長度和故障發(fā)生點對其沒有影響,感性分量與線路參數(shù)和故障點都密切相關(guān)。討論了輸電線路參數(shù)對潛供電弧的影響,并應(yīng)用ATP電磁暫態(tài)仿真軟件對單回輸電線路和雙回輸電線路研究了大地電阻率、故障相、故障點、線路長度等因素對潛供電流和恢復(fù)電壓的影響。分別介紹了并聯(lián)電抗器中性點加裝小電抗和加裝快速接地開關(guān)(HSGS)對潛供電弧的抑制原理,并應(yīng)用ATP仿真軟件對一條同塔雙回輸電線路進行模擬仿真分析,提出了利于快速滅弧的中性點小電抗的取值范圍和快速接地開關(guān)的最優(yōu)配置。結(jié)果表明,兩項抑制措施均能快速有效的將潛供電流迅速限制在10A以下,加快了滅弧速度,大大提高了單相自動重合閘的成功率
[Abstract]:In order to ensure the stability and reliability of the power system, the single-phase grounding transient fault is usually adopted in the UHV double-circuit transmission line with the same tower in our country, and the operation mode of one-way automatic reclosing is usually adopted to ensure the stability and reliability of the power system. The success of single-phase reclosing is largely determined by whether the submersible arc of fault point can be extinguished in time. The two important parameters of the submersible arc are the submersible current and the recovery voltage. It is necessary to study its characteristics and take reasonable and effective suppression measures to improve the success rate of reclosing. In this paper, the concentrated parameter method and the distributed parameter method are used to derive and analyze the potential supply current and the recovery voltage, and it is found that the submersible current and the recovery voltage are mainly composed of capacitive and inductive components. The obtained mathematical expression shows that the capacitive component of the potential current is proportional to the length of the line and increases with the increase of the interphase capacitance of the line. The inductive component of the potential current is closely related to the occurrence point of the line fault. And there is a certain regularity, the opposite direction is equal at both ends of the line. The capacitive component of the recovery voltage is only related to the voltage and capacitance of the line, the length of the line and the fault occurrence point have no effect on it, and the inductive component is closely related to the line parameters and fault points. The influence of transmission line parameters on submersible arc is discussed, and the earth resistivity, fault phase and fault point of single circuit transmission line and double circuit transmission line are studied by ATP electromagnetic transient simulation software. The influence of line length and other factors on the submersible current and recovery voltage. This paper introduces the principle of suppression of submersible arc by adding small reactance to neutral point of parallel reactor and fast grounding switch (HSGSs), and simulates and analyzes a double-circuit transmission line with the same tower by using ATP simulation software. The range of small reactance of neutral point and the optimal configuration of fast grounding switch are proposed. The results show that both of the two suppression measures can quickly and effectively limit the potential supply current to less than 10A, accelerate the arc extinguishing speed, and greatly improve the success rate of single-phase automatic reclosing.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM75

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本文編號：1870626