变压器电抗参数的初探

针对变压器短路电抗的特征、性质、计算和绕组的排列方式对其影响进行了阐述,分析和验证了等效电抗的物理意义。     

为什么空芯变压器会有可变的反射特性

本文系统地讨论了部分耦合和全耦合空芯变压器具有的不同反射特性,分析了由于互感磁通变化引起的空芯变压器反射电抗性质改变的规律,从而揭示了铁芯变压器和全耦合空芯变压器的内在联系.     

浅析三绕组变压器的等值电抗

分析三绕组变压器位于中间位置的绕组等值电抗总是为负值的问题     

变压器有载调压对电抗的变化及其系统电压稳定的影响

介绍调压变压器对电力系统电压稳定、无功平衡的作用,分析了变压器有载调压对电抗的变化及电力系统电压稳定性的影响,提出了电力系统无功平衡的技术措施和技术对策.     

基于FLUX3D的变压器油箱和夹件杂散损耗分析研究

开展杂散损耗分析有助于提高变压器运行效率。本文利用法国FLUX3D软件建立了一个考虑油箱和夹件损耗的SFL1-20000/35变压器有限元模型,获得了变压器油箱和夹件的涡流分布和损耗估计值。通过自定义B(H)磁滞曲线参数,采用线性表面阻抗法和非线性表面阻抗法分别计算了变压器油箱壁及夹件涡流损耗。与国标参数/出厂测试参数校核结果显示非线性表面阻抗法具有准确性更高的特点。相关模型构建的讨论与计算结论对于标准或特种变压器的优化设计和运行分析具有一定的参考价值。     

一种考虑J-A磁滞的变压器电磁暂态模型

在电力系统电磁暂态模型建立中，变压器模型是不可或缺的。随着建模不断往精细化发展，对变压器电磁暂态模型的要求越来越高。目前电磁暂态仿真缺少一种考虑磁滞的变压器模型。针对以上问题，利用J-A(Jiles-Atherton)模型表示磁滞，使用梯形积分法对变压器进行建模，并提出一种将磁滞模型与变压器电磁暂态模型相结合的方法。理论计算与实验结果表明，该模型可准确地描述变压器磁滞，且离散化算法与PSCAD软件所使用方法一致，方便未来嵌入电磁暂态仿真软件。     

解析变压器阻抗电压的计算

阻抗电压的计算是变压器计算中很重要的工作，阻抗电压值是变压器重要性能数据．标准系列的变压器阻抗电压在性能标准中已有规定。     

电力变压器励磁涌流仿真计算的瞬时功率法(英)

提出一种基于变压器铁芯材料的基本磁化曲线B=f（H）、变压器铁芯的几何尺寸、空载损耗数值及瞬时功率的概念,对变压器空载合闸时,在各种不同合闸角及各种不同剩磁情况下所产生的励磁涌流进行计算的新方法．通过对计算结果的分析,得出励磁涌流的特征,如峰值、波形及间断角的大小同剩磁和合闸角的关系等．利用电磁暂态仿真程序EMTP对同一变压器模型进行仿真计算,结果与本文方法的计算结果非常接近,证明了本文方法的正确性,有助于对电力变压器设计的正确性进行校验及变压器保护的研究．     

几种整流变压器和电炉变压器绕组起始参数计算

介绍了几种常用调压形式的整流变压器和电炉变压器各绕组起始参数的计算方法，分析了在不同分接位置各参数的变化规律。     

变压器错档切换运行技术在包钢35/6KV变电所的应用

介绍了变压器错档切换运行技术及其参数计算方法，分析了包头钢铁公司炼铁厂电压波动原因。采用变压器错档切换动运行技术，成功地解决了电压波动问题，保证了炼铁厂正常生产。     

大学生心理逆反现状调查研究

运用修订的Hong氏心理逆反量表对兰州市五所高校507名大学生的心理逆反现状进行了调查。结果表明,大学生心理逆反水平总体上呈中等程度,但仍有35.3%的大学生心理逆反水平较高;男大学生的总体心理逆反水平显著高于女大学生;大四学生的总体心理逆反水平最高;大学生心理逆反水平在不同专业、生源、家庭结构以及父母文化程度等方面无显著差异。     

父母教养方式与中学生逆反心理的相关研究

研究使用翻译并修订后的＂Hong＂氏逆反心理量表、父母教育方式量表对250名初中生进行问卷调查,结果表面中学生逆反心理在年级、性别变量上差异显著,初二学生的逆反心理高于初一;女生的逆反心理低于男生;父母教养方式在性别上的差异有统计学意义;父母亲的教育方式与中学生逆反心理相关显著。父亲因子2惩罚严厉、父亲因子3过分干涉、父亲因子5拒绝否认、母亲因子2过度干涉、母亲因子3拒绝否认、母亲因子4惩罚严厉对逆反心理总分有较大的正向预测作用。     

主变加装小电抗限制220kV侧短路电流的应用分析

对500kV变电站220kV母线单相短路电流普遍超标主要原因、限制短路电流措施、小电抗阻值的选择、小电抗对继电保护的影响、小电抗电气主接线方案等进行了分析;为提高500kV主变供电可靠率和主变的利用率,适应东莞电网220kV电网的发展要求,提出相应的解决方案。     

圆波导中探针互阻抗特性的研究

应用矢量位函数、反应的概念和互易原理，推导出圆波导中双探针的互阻抗表达式，圆波导是半无限长的，终端接有一定反射系数的负载．发现了探针的互电阻是由主模产生的，而互电抗则是由主模和高次模共同引起的；由于高次模随着探针之间距离的增加急剧衰减，所以对互电抗的主要贡献来自于主模．然而当探针之间的距离趋近于零时，高次模起主导作用，产生很大值的互电抗．互阻抗取决于探针的位置、高度和相互之间的距离，以及终端面的位置．     

Counseling Students’ Emotions During Cultural Immersion: Impact on Reactance

Counselor trainees’ multicultural development is a process that engenders strong emotions. The authors inventoried students’ emotions in cultural immersion activities and assessed their impact on course reactance. Findings indicated that reactance was shaped by both negative and positive emotions and that cultural immersion can be universally challenging for students.     

Rebels With a Cause? Adolescent Defiance From the Perspective of Reactance Theory and Self‐Determination Theory

The present investigation focused on adolescents' defiance against parents by drawing upon psychological reactance theory (Brehm, 1966) and self‐determination theory (Ryan & Deci, 2000). Psychological reactance would be elicited when freedom is taken away, thereby motivating individuals to engage in oppositional behavior. Throughout four studies (total N = 1,472, age ranging between 12 and 21 years), it was examined whether a controlling parenting style related to adolescents' experiences of autonomy need frustration (i.e., pressure) and reactance. Reactance, in turn, would relate to more externalizing and internalizing problems. Support was obtained for these associations in community and clinical samples, making use of different informants, and controlling for responsiveness and rule setting. A vignette‐based study provided further support. The discussion highlights theoretical and clinical implications.     

Effects of Humor on Presence and Recall of Persuasive Messages

This investigation examined how exposure to a humorous persuasive message affects antecedents of presence (i.e., the sensation of being “in” a mediated environment) facilitating message recall. Participants in an experimental study viewed either a humorous or non-humorous version of an alcohol public service announcement and then completed measures of positive emotion, perceived credibility, psychological reactance, presence, and message recall. As predicted, positive emotion was related to an increase in perceived credibility and a decrease in reactance. Increased perceived credibility was associated with greater feelings of presence, negatively affecting recognition memory. These findings suggest that presence may sometimes impede persuasive message recall, although not necessarily to the detriment of attitude change.     

巧判三点式振荡电路能否振荡

本介绍一种通过判断极间电抗性质来判断三点式振荡电路能否振荡的方法，使初学更简易的掌握三点式振荡电路的判别。     

Therapist Directiveness and Client Reactance in the Administration of Homework in Therapy with College Students

The present study used an analog design with three vignettes portraying homework administrations at three levels of therapist directiveness (low, medium, and high) and the Therapeutic Reactance Scale to measure participant reactance. Participants (N = 436) read the vignettes and completed the Homework Completion Scale (HCS), Counseling Continuation Scale (CCS), Counselor Rating Form-Short (CRF-S) Attractiveness and Expertness subscales. A repeated measures analysis of variance revealed significant differences between low and high reactant groups on the HCS and CCS for the High and Medium directiveness homework administrations. These results suggest that therapist directiveness does interact with client reactance in the administration of homework.