无功补偿电容器组的并联谐振分析

当系统中存在谐波源时,无功补偿电容器组与系统电路会在某次谐波频率下发生并联谐振。本文分析了谐振次数与电容器组容量、母线短路容量以及母线电压上升值之间的数学关系。并联电容器组与电抗器串联具有滤波功能,同时也会与系统发生并联谐振。还分析了滤波次数和发生谐振次数的数学关系。     

Application of local variations and maximum sensitivities selection for optimal placement of shunt capacitor banks under nonsinusoidal operating conditions

A new iterative algorithm is proposed for optimal sizing and placement of fixed and switched capacitor banks in radial distribution lines in the presence of linear and nonlinear loads. The method is a combination of maximum sensitivities selection (to improve convergence by selecting candidate buses) and local variations (to improve accuracy in the permissible solution region) and is implemented using the HARMFLOW codes. Objective functions include minimum energy losses, peak losses and capacitor costs while IEEE-519 power quality limits are used as constraints. The 18 bus IEEE distorted system is used to investigate the advantages and limitations of the proposed algorithm and compare its performance with the maximum sensitivities selection (MSS) method. The contributions of the proposed algorithm, as compared to prior publications, are the consideration of harmonic couplings and reactions of actual nonlinear loads, improved convergence and more accurate solutions.     

几起35kV集合式并联电容器故障分析

集合式并联电容器已广泛用于电力系统。本文介绍了对几种电容器组运行故障原因的发现和分析 ,以及解决的方法。尤其对由于差压保护动作 ,导致投运失败的原因和处理方法作了详细的介绍。文章最后对电力系统的运行保护设定和制造厂的制造提出了建议     

对GB／T47O3-2001电容式电压互感器标准的几点意见

提出对GB／T4703标准中热极限输出、准确度、电磁单元温升、承受短路能力和铁磁谐振条文的修改意见。     

挖掘静态补偿潜力，进一步提高牵引变电所功率因素的简便方法

介绍了一种在未实施无功动态补偿改造前，仅利用已有静态电容补偿，进一步提高牵引变电所功率因数的简便方法，并推导出有关确定补偿电容量的计算公式，提出相关建议。     

电容式电压互感器介损的测试方法

介绍了电容式电压互感器(CVT)中电容器部分的介损和电容量现场测量方法，即采用正接法直接在电容器两端加试验电压的办法测量。克服了二次加压法现场试验比较烦琐、对试验人员要求比较高，以及由于二次加压不当造成互感器损伤等缺点。     

集合式电容器的缺陷分析处理

本文对一台绝缘油色谱异常的集合式电容器进行了分析,找出原因,提出解决方法,通过实践证明集合式电 容器运行中应增加绝缘油色谱试验项目。     

产品标牌自动打印装置应用研究

为了降低CVT、并联电容器等产品标牌的制作成本,提高标牌的外观和打印的美观程度,通过市场调研,选择适合我公司标牌制作的材料,并经过对市场上的自动打印设备进行对比筛选,最终确定选用HDM-PC气动标记机来完成我公司产品标牌的制作。     

用碳气凝胶作电极材料制作双电层电容器

双电层电容器具有极大的电容量和优良的充放电性能，这种新型储能器件有着广泛的应用前景。用微结构可控的纳米多孔导电材料碳气胶作为电极制作的双电层电容器的比电容达２５Ｆ／ｇ，其内阻在１Ω以下，漏电流小于１ｍＡ。     

AC Complex Impedance Analysis of Doped Strontium Titanate Multifunctional Ceramics

Doped SrTiO3 capacitor-varistor multifunctional ceramics were fabricated by a single sintering process.AC complex impedance analysis was performed to investigate electrical features of grains and grain boundaries for both as-reduced ceramic and reoxidized ceramics.The results showed that the as-reduced ceramic exhibited inductive response at high frequencies above 2MHz,which is attributed to the contribution of electron behavior in semiconducting grains.The high frequency inductive response disappeared in impedance plots of reoxidized ceramics.