变电站进线电缆化对电网供电模式的影响

随着城区负荷密度的提高和用电量的急增,目前呈现高压变电站深入负荷中心供电的趋势,但出于市容建设等各方面的要求,架空线走廊日益紧张,新增高压供电线路基本以电缆为主。基于架空线和电缆线路的不同特性,对不同电压等级变电站的主接线和电网供电方式进行分析,研究了架空线电缆化对网络结构和变电站主接线产生的影响,对不同供电方案进行比较,为高压电缆线路给城市电网的供电模式带来的影响提出对策。     

六分裂阻尼弹簧相间间隔棒的试验与模拟

针对专利产品新型六分裂阻尼弹簧相间间隔棒,试验研究两相六分裂导线使用该相间间隔棒在微风振动时及不同风速加载条件下的稳定后振幅及夹口处动弯应变情况,并运用有限元软件ANSYS建立两相六分裂导线的有限元模型,对其进行数值模拟。研究结果表明,使用新型阻尼弹簧相间间隔棒的导线系统在不同风荷载作用下的稳定后振幅及夹口处动弯应变皆小于采用传统相间间隔棒的情况,具有良好的减振能力;阻尼弹簧相间间隔棒的性能可以通过调节弹簧刚度及重球质量而改变;采用杆单元LINK10、阻尼器单元COMBIN14、质量块单元MASS21等进行有限元建模,可以得到较为理想的结果,数值分析的结果与试验结果能够较好地吻合。     

中压交联电缆的交流试验方法分析

针对中压交联电缆交流耐压在上海电网实施中存在的问题,研究了中压交联电缆的交流试验方法,提出了现场试验标准,并提升了试验参数;研发了车载试验设备,提高了试验能力和可操作性,为上海以及其他地区开展电缆交流耐压工作提供了依据。     

基于5G通信的电气设备监测终端性能在线评估方案

随着在线监测技术在配网一次设备中的大规模应用,由监测终端本身性能问题引发的误报警事件时有发生,造成了极大的人力物资损耗。因此,亟需寻找一种针对电气设备监测终端性能的在线评估方法,能及时对处于异常状态的二次监测设备进行预警和消缺。为此,提出了一种基于5G通信的电气设备监测终端性能在线评估方案。首先,利用5G通信技术实现区域内全部监测终端的数据收集。然后,引入平均偏离程度等三种指标,通过比对收集数据与历史数据的差异实现监测终端的在线评估,最终完成误报警事件的辨识。实例分析证明,该方法能准确判别监测终端的运行状态,避免误漏报事件带来的不良影响,具有可行性。     

基于改进 SVD_EMD 的绝缘子泄漏电流去噪方法

泄漏电流是表征气体绝缘输电线路(GIL)内部绝缘子性能优劣的重要指标,在实际工程中泄漏电流信号的采集常受窄带信号与白噪声信号的干扰,进而影响对于绝缘子性能的准确评估,常用泄漏电流去噪方法多依赖于经验参数与人工设定。针对以上问题,提出利用奇异值曲率谱对奇异值变换(singular value decomposition,SVD)进行改进,去除窄带信号干扰;然后引入正负白噪声组,利用经验模态分解(empirical mode decomposition,EMD)对含有白噪声信号的泄漏电流信号进行分解,在分解过程中对模态分量进行去噪处理,保留最终模态分量即为无噪泄漏电流信号。信号仿真与现场实测结果均表明所提方法可以有效实现GIL绝缘子泄漏电流去噪。     

含电动汽车的新能源微电网多目标分层优化调度

电动汽车(EV)和新能源微电网(NEMG)分属不同利益主体。针对EV接入NEMG后的经济运行问题,建立计及EV有序充放电行为和车主综合满意度的NEMG多目标分层调度数学模型并提出求解计算方法。EV层以最大化车主的综合满意度为目标,通过CPLEX软件求解得到EV充放电计划并传递给NEMG层。NEMG层基于EV充放电计划调整微电网内部可控分布式电源出力,以达到最小化系统综合成本和交互功率波动的目标。为求解该高维、非线性和多目标模型,提出基于可信度的三黑洞系统捕获策略多目标粒子群优化算法。仿真结果表明,含EV微电网分层架构相比不分层架构能实现EV和NEMG的互利共赢,验证了所提方法的科学性及有效性。     

高速电脱盐技术的应用

高速电脱盐技术是目前世界上先进的原油电脱盐技术,在同等务件下,其脱盐脱水、脱水含油量和装王电耗等指标均好于低速电脱盐,具有脱盐效果好、单罐客处理能力大、电耗低、占地少等优点.在吉林石化公司炼油厂一套常减压装置的应用结果表明,该技术是装置改造可供选择的脱盐技术.     

Application of fiber-optic curvature sensor in deformation measurement process

In this work an experiment performed in laboratory conditions, for the purpose of comparison of multiple methods for one-dimensional (1D) deformations detection, is described. The fiber-optic curvature sensor (FOCS) method was applied as the primary one. Geometric leveling, accelerometer measurements of acceleration, and angular shift measurements using tiltmeter were used for comparison and calibration. Static and dynamic tests were performed independently, followed by evaluation of the acquired results. Based on the presented results of sensor performance, new possibilities arise for geodetic profession and implementation of new technologies in structural monitoring of the buildings.     

Failure analysis of a pull rod actuator of an ATOX raw mill used in the cement production process

A failure analysis of a forged and machined pull rod made of a quenched and tempered high strength steel – namely DIN 34CrNiMo6 – is presented in this paper. The pull rod under study is one of the three rods that connect the three existing hydraulic cylinders to the roller mill and it is used to exert grinding pressure on the roller in an ATOX raw mill. The study of the failure involved the mechanical system's simulation, as well as the fatigue damage assessment based on the application of the Rainflow Method and Fracture Mechanics principles. The pull rod's stress state was determined from in situ strain gages rosettes measurements, and system's simulation showed that the pull rod was designed to support axial loadings only. To ensure this stress state, a proper functioning of the plain bearings and a good condition of the elastomers of the horizontal rod buffer are required. According to the stress-life approach given in the FKM guideline, the current design solution should provide a useful life of 50 years to the pull rod. However, fatigue crack growth calculations made with the strain spectra registered demonstrated that the presence of an initial surface crack is extremely harsh to the lifespan of the rod, which will reach a critical value in a much shorter period of time. Surface finish, corrosion protection and maintenance actions to ensure the correct functioning of the plain bearings, could be important to ensure the desired longevity of the pull rod.