The problem of investigating the minimum set of landmarks consisting of auto-machines(Robots)in a connected network is studied with the concept of location number ormetric dimension of this network.In this paper,we st...The problem of investigating the minimum set of landmarks consisting of auto-machines(Robots)in a connected network is studied with the concept of location number ormetric dimension of this network.In this paper,we study the latest type of metric dimension called as local fractional metric dimension(LFMD)and find its upper bounds for generalized Petersen networks GP(n,3),where n≥7.For n≥9.The limiting values of LFMD for GP(n,3)are also obtained as 1(bounded)if n approaches to infinity.展开更多
为研究66 kV消弧线圈接地系统单相接地故障引起的短路电弧在空气中燃弧特性,在变电站建立了人工单相接地试验模拟平台。对消弧线圈补偿电流为92.8、97.9、103.3 A 3种工况下的接地电弧进行了试验,记录了电弧的电压、电流波形。试验结果...为研究66 kV消弧线圈接地系统单相接地故障引起的短路电弧在空气中燃弧特性,在变电站建立了人工单相接地试验模拟平台。对消弧线圈补偿电流为92.8、97.9、103.3 A 3种工况下的接地电弧进行了试验,记录了电弧的电压、电流波形。试验结果表明:接地电弧的频率特性不随消弧线圈补偿程度而变化。起始时刻的弧道电阻与合闸角度相关,合闸角度越大,弧道电阻越大。稳定燃弧状态下,半个周波的电压变化率不随消弧线圈补偿程度而变化,为120 kV/s,而电流的变化率随消弧线圈的补偿程度而增大,分别为12、14、16 k A/s;在稳定燃弧后的不同周期内,电弧伏安曲线不一致,但其发展规律相同。稳定燃弧后的电压幅值与消弧线圈补偿程度无关,其正负幅值之差为1 200 V,消弧线圈过补偿程度越大,电流幅值越大,其幅值能够达到80 A。该研究成果可为消弧线圈的参数整定提供理论参考依据。展开更多
基金funded by the Deanship of Scientific Research at Jouf University under Grant No.DSR-2021-03-0301supported by the Higher Education Commission of Pakistan through the National Research Program for Universities Grant No.20-16188/NRPU/R&D/HEC/20212021.
文摘The problem of investigating the minimum set of landmarks consisting of auto-machines(Robots)in a connected network is studied with the concept of location number ormetric dimension of this network.In this paper,we study the latest type of metric dimension called as local fractional metric dimension(LFMD)and find its upper bounds for generalized Petersen networks GP(n,3),where n≥7.For n≥9.The limiting values of LFMD for GP(n,3)are also obtained as 1(bounded)if n approaches to infinity.
文摘为研究66 kV消弧线圈接地系统单相接地故障引起的短路电弧在空气中燃弧特性,在变电站建立了人工单相接地试验模拟平台。对消弧线圈补偿电流为92.8、97.9、103.3 A 3种工况下的接地电弧进行了试验,记录了电弧的电压、电流波形。试验结果表明:接地电弧的频率特性不随消弧线圈补偿程度而变化。起始时刻的弧道电阻与合闸角度相关,合闸角度越大,弧道电阻越大。稳定燃弧状态下,半个周波的电压变化率不随消弧线圈补偿程度而变化,为120 kV/s,而电流的变化率随消弧线圈的补偿程度而增大,分别为12、14、16 k A/s;在稳定燃弧后的不同周期内,电弧伏安曲线不一致,但其发展规律相同。稳定燃弧后的电压幅值与消弧线圈补偿程度无关,其正负幅值之差为1 200 V,消弧线圈过补偿程度越大,电流幅值越大,其幅值能够达到80 A。该研究成果可为消弧线圈的参数整定提供理论参考依据。
基金This work was supported by National Natural Science Foundation of China Grant No.60174049Key Project of Education Department of Hubei Province (2001A43007).
