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INTRODUCTIONTransmissionlinesofapowersystemaresubjecttomanykindsoffaults.Theprincipaltypesare :phase to earth ;doublephase to earth(phase phase earth) ;phase to phase ;three phase.Followingtheoccurrenceofatransmis sionlinefault,themaintenancecrewmustfinda… 相似文献
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An accurate algorithm for fault location of double phase-to-earth fault on transmission line of direct ground neutral system
is presented. The algorithm, which employs the faulted phase network and zero-sequence network as fault-location model in
which the source impedance at the remote end is not involved, effectively eliminates the effect of load flow and fault resistance
on the accuracy of fault location. The algorithm achieves accurate location by measuring only one local end data and is used
in a procedure that provides automatic determination of faulted types and phases, and does not require the engineer to specify
them. Simulation results showed the effectiveness of the algorithm under the condition of double phase-to-earth fault.
Project (No. 023801211) supported by the Key Science Foundation of Tianjin, China 相似文献
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不同产品的性质影响合约安排的效率,产品特性的经济学分析是分析组织合约的基础。大学知识产品的非标准化描述程度、难以计量性、外部溢出性以及投入资源的相互依赖性等经济学特性,是大学改革中数量化倾向导致激励扭曲效应产生的根本原因。 相似文献
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教育指标想要在教育政策决策过程中更好地发挥作用,其构建的逻辑应当基于教育系统理论模式,还是指向政策问题模式?本文试图通过梳理和分析教育指标研究的国内外文献与相关研究报告,从社会指标概念发展的脉络出发,明晰教育指标中的政策功能来回答这一基本问题,并通过对联合国教科文组织较为成熟的教育指标体系构建模式的分析验证上述回答。本... 相似文献
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