带微机低压断路器智能脱扣装置的研究

讨论了低压断路器智能脱扣装置的设计思想、特点及算法．介绍了结构框图、热积累效应、电量放大器和复式电源     

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给出了EAST极向场磁体电源失超保护系统的设计方案,描述了两种失超保护开关——直流快速开关和爆炸开关采用的两级换流结构的设计和工作原理,分析了这种结构在换流过程中的规律,该结构有效地解决了开关开断直流大电流的难点。通过模拟实验证明了该失超保护系统满足设计要求。     

Some Aspects of Current Interruption Physics in High Voltage Circuit Breakers

Recent results of experimental and theoretical investigations on current interruption processes are presented with a focus on SF₆ high voltage circuit breakers. Various aspects of thermal interruption at the zero crossing of the current are shown, including the scatter and the distribution of arc voltage shortly before CZ and the role of turbulence. The thermal interruption capability of air and CO₂ are compared to that of SF₆. Investigations on the dielectric recovery are shown for SF₆ and CO₂. The breakdown voltage during the dielectric recovery can be described by simple streamer and leader inception models. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Numerical solution of axisymmetric multi-species compressible gas flow: towards improved circuit breaker simulation

Nozzle wall ablation caused by high-temperature electrical arcs is studied in the context of high voltage SF₆ circuit breakers. The gases generated by the ablation mix with insulating gas, thereby modifying the thermodynamics and chemistry of the problem. To simulate these phenomena, an axisymmetric Euler equations model for multi-species flow at local thermodynamic equilibrium has been developed. The governing equations are solved using a finite-volume method based on Roe's flux-splitting scheme and a new procedure is proposed to obtain the mean values used in Roe's matrix involving multi-species. The change in the gas composition due to dissociation, ionisation and recombinations are taken into account by a dynamic coupling to a thermodynamic database. The formulation is appropriate for general equations of state. The scheme has been verified by comparisons with the analytical solution of a classic shock-tube problem. An experimental validation is presented involving the simulation of shock interactions with helium cylinders and bubbles in air. The scheme is also compared to experimental ablation results, as well as a previous version of the code. The model is then applied to a well controlled experimental arrangement with an arc inside a small Teflon^® tube. Finally, a simulation with a model circuit breaker completes the study.     

硼交联水基冻胶压裂液的研究发展现状

综述了硼交联水基冻胶压裂液的国内外研究发展现状．着重介绍了国外应用核磁共振（ＮＭＲ）能谱技术研究硼交联机理得出的结论、有机硼配合物交联剂的延迟交联机理和优异性能、硼交联压裂液的粘弹性和测定方法以及破胶剂的最新发展成果—胶囊破胶技术．指出了硼交联水基冻胶压裂液的几个重要研究和发展方向     

破胶剂TS-506A的研制及性能评价

聚合物驱增产效果显著,但随之而来的注聚堵塞问题也日益突出,聚合物堵塞会导致注聚井的注入压力显著上升,注液困难,严重影响了聚驱注入效果和油田的正常生产.为了解决聚合物堵塞问题,基于自由基氧化降解反应思路开发了破胶剂TS-506A,通过对TS-506A的多项性能评价试验及破胶物模试验表明,在模拟地层条件下,破胶剂TS-506A对聚合物的降解率达99%以上,对于注聚造成的伤害率达50%的岩芯,破胶后的岩芯渗透率恢复值达128%,破胶率达157%,破胶效果显著.     

DSP/BIOS实时系统在电智能断路器中的应用

分析了TI公司实时系统的内核DSP/BIOS,以DSP/BIOS内核作为智能断路器的核心设计了智能断路器系统。以线程的形式安排各个子功能模块,分配系统资源,对系统进行详细的分析和设计,最终实现对智能断路器的实时控制。实践证明,整个系统运行良好,提高了系统的实时性和准确性。     

软启动器烧毁另类原因分析与解决

通过在实际工作中解决软启动器烧毁故障的实践,从另一角度分析了类似软启动器等精密设备的故障原因,对在制作、组装过程中出现的氧化问题提起了重视及解决方法的参考.     

真空断路器弹簧操动机构中凸轮机构的优化设计

改善真空断路器操动机构的传动运动特性 ,减小真空断路器的操作输出功 ,对提高真空断路器的操作使用性能及寿命都具有直接的影响 利用凸轮机构的多项式运动规律的特点 ,以凸轮多项式运动规律的多项式系数为优化变量 ,以断路器操动机构最小的输出功为目标函数 ,考虑操动机构合分闸时凸轮机构传动压力角的情况 ,建立了弹簧操动机构中凸轮机构的优化数学模型 ,并利用MATLAB语言的优化工具箱方便地实现了优化过程 ,得到了较理想的优化设计结果     

真空断路器触头合闸弹跳特性的研究

通过对真空断路器动触头在合闸弹跳运动过程中的受力分析 ,建立了触头合闸弹跳运动时的动力学模型 ,得到断路器动触头在合闸时弹跳时间的有关计算公式 ,分析了动触头在合闸过程弹跳运动的主要影响因素以及缩短触头弹跳时间的方法 ,并利用分析结果对VG1型真空断路器进行了计算 最后通过实验对动触头在合闸时弹跳时间进行了测试 ,测试表明其与计算结果是一致的