谐波屏蔽变压器对船舶电力系统谐波的抑制研究

介绍了一种谐波屏蔽变压器(HST)在船舶中压电力推进系统中的应用。HST是一个三绕组变压器,三个绕组分别接电源、负载和滤波器。对HST的原理进行了分析,给出了谐波抑制效果的频域计算结果,试验结果证明了理论分析的正确性。

屏蔽变压器在铁道运输信号控制系统中的应用

针对抚顺西露天矿铁道信号设备易发生变压器故障造成高、低压线圈击穿,出现二次高电压烧坏信号设备影响生产的现象,采用屏蔽变压器,提高了供电质量,实现了安全生产。

屏蔽变压器在电气化铁路信息传输电缆防干扰中的应用

以长白电气化铁路直接供电方式为例,分析直接供电方式下牵引供电系统对沿线弱电系统信息传输电缆的电磁影响,并给出干扰模型;通过对电磁感应原理的分析,提出并设计了一种可以有效屏蔽信息传输电缆受电磁影响的屏蔽保护装置,同时设计并搭建试验平台,通过测试验证了该保护装置的屏蔽效果。

新型自耦补偿与谐波屏蔽换流变压器阀侧绕组

对新型自耦补偿与谐波屏蔽换流变压器用于12脉波整流时阀侧绕组所涉及的相关问题进行研究,提出延边三角形联结的阀侧绕组匝数、移相角、电压及电流的计算方法,并列举相关实例.

“先驱”依然是先驱——先驱公司访问记

记不得什么时候读过一篇文章,题 目叫“可怕的顺德人”,从此,顺德人勤奋的精神、精明的头脑、开拓的勇气和市场的眼光便深深地留在了我的印象中。最近,当我参观了位于顺德的先驱实业有限公司后,这一印象得到极大的强化。 对视听器材稍有了解的人,都应该听说过“先驱”这个品牌,但他们中并不是每个人都知道,先驱公司如今已是中国AV放大器和相关产品制造商中名符其实的先驱——无论从生产的规模和产品的品质、产品的科技含量看都是如此。

High Frequency Transformers for DC/DC Converter Used in Solar PV System

This paper presents and investigates planar and coaxial high frequency power transformers used for DC/DC converters in a three phase photo voltaic （PV） power systems. The winding structure including a Faraday shield between the primary and secondary windings is designed to minimize eddy current losses, skin and proximity effects, and to reduce the leakage inductance, and the inter winding coupling capacitance. Finite Element Method is employed to analyze the magnetic flux and eddy current distributions. The two different kinds of prototype high frequency transformers are designed and tested. The simulation and experiment results are demonstrated and compared with non-shielded transformers. The shielded transformers have achieved the expected results with a relatively small coupling capacitance, compared with the conventional high frequency transformer. This shield decreases the inter-winding coupling capacitance Cps. The topology of this shield has to be such that it acts as a Faraday screen while avoiding eddy current generation.