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Voltage by phase compensation and non- synchronous sampling of preventive measures

Author: WangMingXuan
Tutor: HuangShaoFeng
School: North China Electric Power University (Beijing)
Course: Proceedings of the
Keywords: Distance protection Differential protection Weak infeed By phase compensation Asynchronous sampling CT saturation
CLC: TM773
Type: Master's thesis
Year: 2010
Downloads: 36
Quote: 0
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Abstract


Main work of this paper is to study the EHV transmission lines using optical fiber differential protection and distance protection when they face some special problems. Mainly for the following: First , the case of the ground fault weak infeed side of the current, voltage and impedance measurements carried out a detailed analysis . And proposed the introduction of current, voltage, phase compensation according to wiring, to solve the weak infeed side of the non- fault phase malfunction issue. Theoretical analysis and simulation results show the effectiveness of the method . Secondly , we propose a non-synchronized to prevent fiber differential protection measures sampling malfunction . This measure reduces the maximum degree of non- synchronous sampling case, differential protection chance . Simulation results demonstrate the effectiveness of the new measures . Finally, the CT saturation process characteristics are described and detailed analysis of the CT saturation of the secondary currents for determining CT saturation engineering practice to provide a theoretical basis .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Line Protection
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