TBM-160-2型汽轮发电机定子绕组击穿原因分析与处理

分析TBM-160-2型发电机定子绕组击穿的原因，介绍定子绕组击穿后的处理方法和过程，对定子油冷发电机的处理具有指导作用，为我国将来制造和引进大容量定子油冷发电机积累检修经验。     

发电厂厂用电系统中性点接地的新方法

针对发电厂厂用电系统的特点，分析了以往常用的几种中性点接地方式所存在的问题，提出了一种基于现代先进技术的新型接地方式——快速消X弧线圈接地加快速选线(跳闸)，介绍了可实现该接地方式的产品——KD—XH型智能化快速消弧系统和DDS型接地故障智能选线装置，并论述了该接地方式的优点和发展前景。     

偏磁式消弧线圈的新型调谐原理

偏磁式消弧线圈的现有调谐方法，在电网极度平衡地区，电容电流检测精度受到限制。本文提出采用注入法的偏磁式消弧线圈的新型调谐方法，并进行系统设计，研发出基于双机通讯式的采用注入法的偏磁式消弧线圈控制器样机。试验结果表明，新型原理正确，满足现场应用要求。     

一种新的谐振接地系统的研制

提出了一种应用可控硅技术并采用全新的高短路阻抗变压器式可控消弧线圈的新的谐振接地消弧系统。消弧线圈由一个一次线圈及两个二次线圈构成，通过两组SCR控制消弧线圈二次电流，结合电流调节算法能有效抑制谐波，系统电抗具有优良的伏安特性，采用拟合曲线法确定可控硅的导通角与消弧线圈补偿电流的关系。模拟实验与现场运行验征了设计的有效性。     

Low-frequency quadrature mode birdcage resonator

The birdcage resonator is frequently used in conventional MRI because of its excellent attributes. Its use in low-field MRI is restricted to field strengths higher than, for example, 0.1 T, dependent on the size of the coil. This is because of the intrinsically low inductance value of the birdcage coils. Furthermore, the sensitivity of the birdcage at low field strengths is significantly lower when compared to, for example, the solenoid. Both problems can be overcome with the multiturn technique and a novel wound birdcage coil. The quadrature mode wound birdcage coil presented in this paper can be used at frequencies as low as 100 kHz. Its sensitivity is also increased when compared to the conventional strip-ring birdcage. Homogeneity effective volume, and methods to increase the resonator bandwidth to match the signal bandwidth are left intact. The latter is a typical low-field problem.     

Optimal packing of transformer coil via dynamic programming

One of the transformer major design elements is its core design. The good performance of the transformer requires its coil core to be laminated and composed of different - widths stepped layers of specific steel packed together. For optimum design, the cross sectional shape of the core must be as circular as possible. So, an optimal packing can be attained by maximizing the steel core coverage. The number of different widths of steel plates n is selected to compose the packed core for a coil of diameter d. Then, an optimum sequence of decisions, for the n widths as well as the number of thin plates of each, is required. Dynamic programming (dp) is concerned with this optimum sequential decisions. An adequate forward recursive equation is formulated , because there isn't a standard dp model for all sequential decision making problems. To implement the recursive computations, a FORTRAN program is developed. Assuming that d is given the values 150, 200, 250, 300, 400 and 500 mm. while giving n the values from 2 to 15, the program is run at different combinations of n and d. It is found that maximum core coverage is sensitive to changing of n but it is slightly affected by changing of d.     

三水地区配电网中性点接地方式及其消弧系统的运行分析

介绍了三水地区的10kV配电网中性点接地方式以及对消弧线圈的选择。根据三水高丰变电站的运行记录,分析了KDXH型智能化快速消弧系统应用效果,阐述了其在高阻接地或弧光接地情况下具有提供正确补偿及响应速度快的性能。     

自动跟踪补偿消弧线圈装置的应用

为减少配电网的接地电容电流,通常在其中性点加装自动跟踪补偿消弧线圈,市场上消弧线圈种类较多,本文综合考虑各种因素,对自动消弧线圈装置进行研究,提出选型意见。并对消弧线圈容量的选择,消弧线圈的连接方式以及接地变压器的选择等方面做出相应的计算和分析。     

对发电机专业工作的几点建议

根据发电机运行的经验及对事故发生的原因分析，提出了在发电机温度检测、转子匝间短路的检测方面如何提高运行自动化水平的建议；并对防止发电机端部固定螺丝松动和发电机进油方面提出建议.     

用于电子式电流互感器的数字积分器

积分器是基于Rogowski线圈的电子式电流互感器中的关键环节。同模拟积分器相比，数字积分器具有更高的精度和稳定性，更适用于电子式互感器。文中主要论述了互感器用数字积分器的设计与实现，分析比较了多种积分方案；提出了根据设计精度要求，确定积分器所需最低采样率的算法；讨论了解决积分中漂移、初值及饱和问题的措施。研制了数字积分器样机，并进行了实验。实验结果验证了设计方法的有效性与实用性。