电机软起动器的探讨

本文论述了对于鼠笼型三相异步电动机在智能控制中的几种起动方式及其优缺点。     

高层建筑物的防雷接地设计

本文从高层建筑物的防雷要求、钢筋砼基础接地体的应用及如何处理好跨步电压三大方面论述了搞好高层建筑物防雷接地设计的重要性。     

Reliability Evaluation of Middle Voltage Distribution Networks

A reliability evaluation algorithm for middle voltage radial distribution network is presented. The algorithm applied ahead-searching-method to determining the area of breaker influencing, applied bidirectional-searching-method to determining faulting area, and applied behind-searching-method to determining connection switch. Then the type of nodes is determined. The reliability index of nodes,feerders and system can be easily computed by the type of nodes.So the computing effeciency is improved. At the same time, the curtailing load algorithms for low-voltage of buses and over-capacity of lines are presented and the foundation for the reliability assessment is established considering the power flow restriction. From the RBTS68-bus and other middle radial distribution networks,the effectiveness and availability of the method are verified.     

The Determination of the Capacity of the Power Elements in the Automation compensation Power Voltage Stalilizer

In this paper, we first introduce basic work principle of the automationcompensation power voltage stalbilizer and in the second step we derive quantitatively the two computational formulas of two types of power elements,t. e. compensation transformer and auto-transformer, for determining their capacities, thus we have showed quantitatively the main adventage of this type of voltage stabilizer.     

Channel Characteristics of Low Voltage Power Line

In order to make good use of power line carrier to communicate, it is necessary to analyze the time-variable, impedance,attenuation and noise characteristics of low voltage power line. The waves of every characteristic have been experimented. At the same time, aiming at these characteristics, some available measures are given in order to conquer the disadvantage factors. The experimental results show that some suitable carrier communication modes must be adopted to realize ideally the carrier communication on low voltage power line.     

ERROR ANALYSIS OF MOSFET SWITCH TRANSMITTING AC SIGNALS

In this paper,the error caused by the resistance of theMOSFET switch in the transmission of AC signals is straightforwardly derivedin combination with MOSFET physical model.The method ot decreasing transm-issiv eerror is presented.     

茄子种高压电场分选的粒重分布试验与分析

茄子种落入高压静电场中，受到场强作用，将沿电场方向产生位移，不同场强作用，茄子种分离区会不同，不同分离区，种子的粒重也不相同，分布也不相同，它们之间存在着紧密相关作用，本文定量揭示了这种关系。     

高压静电场处理家蚕卵对蚕茧产量和质量的影响

通过实验室试验和生产中试,探讨了高压静电场处理家蚕卵对幼虫生命力、蚕茧产量及茧丝质量的影响。实验室试验结果表明,采用的2个加速电压处理组及4个无加速电压处理组对蚕的孵化和生命力均无不良影响,t检验结果显示全茧量、茧层量、蛹体重等指标比对照区均有显著提高,但处理对雌蚕茧层率影响不显著,而雄蚕的茧层率则多数有明显增加。生产中试结果表明,利用最佳处理条件处理蚕卵,张种产茧量比对照平均提高10.86%,茧层量提高15.45%,茧层率和茧层生产效率分别提高5.00%和12.72%,茧丝长和解舒丝长分别增加72.24、76.09 m,解舒率、上车率也均有所提高,光折降低,茧丝纤度略有增加,对茧丝洁净无明显影响。