低配电系统三相负荷不平衡综合治理技术研究

目前，低配电系统三相负荷平衡是当前困扰诸多供电单位的主要原因之一。本文就低配电系统三相负荷平衡的综合问题进行分析，并探讨相关的治理方法，以供参考。     

谈三相四线电能表的带电调换技术

本文就三相四线电能表的带电调换技术展开了具体研究,希望这一研究能够为相关技术工作人员带来一定的帮助.     

Noble phase behavior of water/propanol/polyethyleneglycol mono alkyl ether/oil system

We studied the phase behavior of three coexisting phases in water/propanol/octaethyleneglycol mono dodecyl ether/heptane system at 45°C. A cone-like three-phase body was found in a composition tetrahedron. In the body aqueous and surfactant phases coexist in the presence of the third coexisting phase, an oil phase, with their loci of composition drawing a closed-loop on addition of propanol. The oil phase remains in an oil-rich region without major change in its composition. The roles of propanol are discussed by using hydrophile-lipophile balance and locations of critical tie lines. Propanol mainly plays two roles; one is as a lipophilic cosurfactant and the other is as a water-soluble cosolvent. The compositions of the critical end points were also determined by a method to use the critical tie line as a clue. In other systems the same pattern phase behavior was observed.     

对三相电路教学中存在问题的分析及对策

本文指出了目前电路理论教学中存在的不合理之处,主要涉及三相电路的分析方面。文中对教学中存在的问题进行了深入分析,通过引入极限的方法,给出了具体对策。论文内容对进一步提高电路理论教学质量,引导学生将数学理论应用于工程实际中的问题分析具有积极作用。     

黄岛发电厂#2炉乙吸风机转子动不平衡故障监测诊断

黄岛发电厂于2001年11月开始利用RA-ENTEK的状态监测系统对全厂重要辅助设备进行常规“在线”和“离线”状态监测，实施状态检修。在此过程中，及时发现#2炉乙吸风机组振动增大，通过利用ENTEK状态监测系统强大的故障分析诊断功能，确定振动突然增加故障的根源，并提出了针对性的排除故障的技术措施和建议，及时避免了设备故障的进一步恶化和扩大，保证了锅炉的正常运行。     

Voltage Unbalance Mitigation in Low Voltage Distribution Networks with Photovoltaic Systems

This paper proposes a technique to mitigate the voltage unbalance issue caused by the high penetration of photovoltaic(PV) systems into the low voltage distribution networks(LVDN) using a single phase energy storage system(ESS).The ESS comprises a bi-directional power flow inverter and a battery bank.The system is capable of absorbing the excess power and delivering power to the network in order to keep the voltage unbalance factor(VUF) below the statutory limit of 1%.Investigations are carried out in the experimental small-scale energy zone(SSEZ).The experimental results demonstrate that the ESS is capable of mitigating the VUF of the network.     

基于ARM单片机载波照明控制器的设计

文中针对传统的井下照明系统存在的弊端,设计了一种基于ARM单片机载波照明控制器。该控制器以ARM单片机为控制核心,以电力线载波通信芯片SC1128为基础,辅以外围接口电路设计,实现实时监控每盏灯的亮灭。与传统的井下照明系统相比,该系统充分利用井下现有的电网资源,无需重新布线,大大降低了用电的成本。     

基于光纤传感器的油气水三相流持气率测井仪

针对测井过程中油气水三相流的含气率的测量问题,本文研究了用于测量含气率的集流型光纤探针测井仪器。首先设计了测井仪器的系统,并对光纤探针法测含气率原理做了分析,其次确定了光纤探针测量含气率的最优探头角度,最后设计了光纤探针传感器驱动电路。     

Combined hollow fiber-based liquid-liquid-liquid microextraction and in-situ differential pulse voltammetry to improve selectivity, sensitivity, and interference elimination in electrochemical analysis

In this paper, a combined hollow fiber-based liquid three-phase microextraction and voltammetric method are applied for the first time as a highly selective and sensitive method of electrochemical analysis. Desipramine, used as a model compound was extracted from 8 mL aqueous solution (donor phase, 0.10 mol L⁻¹ NaOH) through a thin phase of propyl benzoate inside the pores of a polypropylene hollow fiber and finally into a 10 μL acidic acceptor solution inside the hollow fiber. Three microelectrodes designed and constructed for the purposes of this study were placed into the two ends of the hollow fiber inside the acceptor solution, and voltammetric analysis was performed in-situ during the extraction. After 15 min, the final stable signal was used for analytical applications. Under the optimized conditions, an enrichment factor of 301 was achieved and the relative standard deviation (R.S.D.) of the method was 6.2% (n = 5). The calibration curve was obtained in the range of 5-5000 nmol L⁻¹ with a reasonable linearity (R² > 0.988) and the limit of detection (LOD) was found to be 0.8 nmol L⁻¹. Finally, the applicability of the proposed method was evaluated by extraction and determination of desipramine in plasma and urine samples without any dilutions.