【摘要】：半波長(zhǎng)線路顯著長(zhǎng)于常規(guī)線路,傳統(tǒng)基于集中參數(shù)的保護(hù)原理不適用于半波長(zhǎng)線路。提出了半波長(zhǎng)線路伴隨阻抗保護(hù),利用線路兩側(cè)保護(hù)安裝處的電氣量推算出故障點(diǎn)處的補(bǔ)償電壓和補(bǔ)償電流,利用補(bǔ)償電壓和電流構(gòu)建伴隨阻抗,提出了伴隨阻抗的動(dòng)作區(qū)及動(dòng)作邏輯,區(qū)外故障時(shí),伴隨阻抗表示線路任一處的容抗,區(qū)內(nèi)故障時(shí),伴隨阻抗分別表示故障點(diǎn)處的過渡電阻及系統(tǒng)等值阻抗,二者顯著差異,能夠準(zhǔn)確識(shí)別半波長(zhǎng)線路的區(qū)內(nèi)、外故障,利用線路兩側(cè)啟動(dòng)元件構(gòu)造時(shí)差法,確定故障點(diǎn)范圍,提高伴隨阻抗保護(hù)的靈敏度。利用RTDS建立了特高壓半波長(zhǎng)系統(tǒng)仿真模型,仿真結(jié)果驗(yàn)證了保護(hù)方案的有效性。
[Abstract]:The half-wavelength line is significantly longer than the conventional line, and the traditional protection principle based on concentrated parameters is not suitable for the half-wavelength line. In this paper, the associated impedance protection of half-wavelength line is proposed. The compensation voltage and current at fault point are calculated by the electrical quantity of installation on both sides of the line, and the associated impedance is constructed by compensating voltage and current. In this paper, the action region and logic of the accompanying impedance are proposed. When the fault is outside the area, the adjoint impedance represents the capacitive reactance of any part of the line, and in the case of the fault in the region, the accompanying impedance represents the transition resistance at the fault point and the equivalent impedance of the system, respectively. The difference between them is significant. It can accurately identify the faults in and out of the half-wavelength line. The moveout method is constructed by using the starting elements on both sides of the line to determine the range of fault points and to improve the sensitivity of the accompanying impedance protection. The simulation model of UHV half-wavelength system is established by using RTDS. The simulation results verify the effectiveness of the protection scheme.
【作者單位】： 電網(wǎng)安全與節(jié)能國(guó)家重點(diǎn)實(shí)驗(yàn)室(中國(guó)電力科學(xué)研究院);國(guó)網(wǎng)公司華中分部;
【分類號(hào)】：TM75

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