半波長交流輸電線路伴隨阻抗保護(hù)
[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)能國家重點(diǎn)實(shí)驗(yàn)室(中國電力科學(xué)研究院);國網(wǎng)公司華中分部;
【分類號】:TM75
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