中国电机工程学报2022，Vol.42Issue(10)：3587-3600,中插8,15.DOI:10.13334/j.0258-8013.pcsee.202447
基于故障暂态过程的半波长输电线路差动保护策略
Fault Induced Transients Based Differential Protection Strategy for Half-wavelength Transmission Lines
摘要
Abstract
Due to the large distributed capacitance induced by extra-long transmission distance, traditional protection cannot be directly applied on half-wavelength transmission lines (HWTL). This paper proposed a novel differential protection strategy based on fault caused transients for HWTL with the principle of directional wave. In order to identify the direction of faults, the directional waves at each terminal of HWTL were calculated by both voltage and current, and recorded by a sampling frequency of 10kHz. Subsequently, integration of transient waveforms with a low sampling frequency was applied to replace the accurate detection of traveling wave front. Then, the quotient of integral of transients in a short time window was applied to distinguish internal fault and external fault. If the fault occurs in HWTL, quotients of both terminals approximate to one. Conversely, the quotient of one terminal is quite larger than that in the case of internal fault. At last, the robustness of the proposed differential protection strategy has been validated by simulation via PSCAD/EMTDC.关键词
半波长输电线路/差动保护/方向行波/衰减系数Key words
half-wavelength transmission lines (HWTLs)/differential protection/directional traveling wave/attenuation constant分类
信息技术与安全科学引用本文复制引用
曹璞璘,王登,范浩然,束洪春,韩一鸣,杨博,董俊..基于故障暂态过程的半波长输电线路差动保护策略[J].中国电机工程学报,2022,42(10):3587-3600,中插8,15.基金项目
国家自然科学基金项目(51977102,52167012).Project Supported by National Natural Science Foundations of China(51977102,52167012). （51977102,52167012）
