共查询到19条相似文献,搜索用时 500 毫秒
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分析了几种常见的窃电方法,结合实际情况提出了计量装置防窃电建议,希望能够推动防窃电技术的发展,使电力供用双方的正当权益得到保障,更好地提升防窃电水平。 相似文献
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防窃电技术是保障电力行业经济利益的重要手段,在三相电能计量系统中,采用有效的防窃电技术可以减少电力行业的经济损失,规范社会的用电秩序。本文介绍了当前电能计量系统的用电计量,首先了解了我国电能计量的基本概况,然后对三相电能计量系统防窃电技术的具体应用进行了分析,为我国电能计量系统的防窃电研究作参考。 相似文献
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普通单相电能表很容易被人为供电。多年来,供电部门虽然在防窃电管理方面下了很大的力气,诸如铅封表盖与接线盒,加装防窃电箱,集中抄表等,这都是很被动的。基于上述情况,防窃电电能表的技术应运而生。但至今为止,尚没有一种成熟的技术能变为产品而真正得到推广应用,原因何在呢,笔者通过几年的研究分析,认为下述几点存在问题还没有得到解决。如:1.在电能表内采用切断电源的措施来对付窃电行为,这很不实际。窃电者很容易按通电源用电而窃电。2.加装在电能表内的防窃电装置影响电能表的正确计量或静态时耗电。3.用户的线路或用电器出现对地漏电的情况时,具有罚窃电功能的电能表出现罚电动作,这有欠公道。4.很多防窃电电能表在进行耐冲击波电压与脉冲电压的性能检测试验时,往往发生误动 相似文献
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介绍了一起三相四线电能表电流线圈并联焊接电阻的电子化窃电事件,从电能表的计量原理入手,对电子化窃电实例进行剖析,研究了窃电原理,提出了具体的防窃电措施,以期为供电企业提高反电子化窃电能力提供借鉴。 相似文献
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介绍电子式单相电能表的常见窃电方式及防窃电新技术,并详细分析新结构"上进下出"电能表、双回路电能表和零线断线检测技术的工作原理。 相似文献
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An approximate analytical approach to the torsion of thin-walled beams of open cross-section with influence of shear is presented. It is assumed that the normal stresses in the cross-section contour direction are small compared to the normal stresses in the beam longitudinal direction that can be ignored in the stress–strain relations. The stresses and displacements are obtained in the closed analytical form. It is assumed that transverse load can be reduced to moments of torsion only, with respect to the cross-section shear centre. The beam will be subjected to torsion, with respect to the shear centre, i.e. the principal cross-section sectorial coordinate, in the case of cross-sections with two axes of symmetry; to torsion and bending in the case of cross-sections with one axes of symmetry and to torsion, bending and tension in the case of general cross-sections. An illustrative example of beam with one axis of symmetry is given. 相似文献
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Tomoko Hirayama Naomi Yamaguchi Noriaki Hishida Hiroshi Yabe 《Tribology International》2009,42(5):675-681
Optimization of groove dimensions in herringbone-grooved journal bearings is discussed in this paper with aims to design precision spindles with improved run-out characteristics. An evaluation index to represent the magnitude of the amplitude of repeatable run-out is firstly introduced and the groove design parameters are theoretically discussed to minimize the index value with taking the stable operation condition of the bearing into account. The comprehensive parameter research reveals a guideline for the design of the groove configuration for good run-out characteristics. Experiments with a shaft with grooves designed along the proposed guideline show that the amplitude of repeatable run-out reduces to about half of that of a bearing with currently designed groove configurations, thus confirming validity of the above guideline. 相似文献
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介绍了一种弹性模抛光与小磨头修正抛光相结合的两步研抛法实现中等口径光学非球面表面的快速抛光。利用弹性模预抛光来保证小工具抛光模型的准确稳定,并采用补偿的方法减小弹性模抛光对面形精度的破坏作用。然后利用优化的小磨头修正残留的表面误差来提高抛光精度。应用上述方法加工非球面,在较短的抛光周期中,获得的面形P-V精度达0.35μm。 相似文献
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Hagerman RJ Miller LJ McGrath-Clarke J Riley K Goldson E Harris SW Simon J Church K Bonnell J Ognibene TC McIntosh DN 《Microscopy research and technique》2002,57(3):168-173
Attention Deficit Hyperactivity Disorder (ADHD) is seen in the majority of children with Fragile X Syndrome (FraX). Previous work has documented an enhanced sweat response to stimuli in children with FraX compared to controls utilizing electrodermal response (EDR) measures. The present study assesses the EDRs both on and off stimulants in 19 children with ADHD and FraX compared to 17 age- and IQ-matched control patients with ADHD and developmental delays. Although the baseline EDRs were comparable between FraX patients and controls, the patients with FraX had a significant decrease in EDR amplitude and number of peaks when treated with stimulants compared to controls. This suggests that patients with FraX are more responsive to the enhancement of inhibitory systems that occur with stimulant use for ADHD. The use of a quantifiable measure, such as EDR, is recommended in future studies of treatment efficacy. 相似文献
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为降低多产品多资源概率约束下易腐产品库存系统的长期平均成本,首先得出了多品种多资源概率约束下易腐产品库存系统的几个有用的性质和定理;然后基于这些定理,给出了一种搜索多品种多资源概率约束下库存系统最优订货策略的多项式算法,在算法中运用系统动力学仿真方法代替传统算法的复杂过程,并证明了多品种多资源概率约束库存系统优化问题等价于一个单资源多品种概率约束库存系统优化问题;最后给出了一个计算实例,表明多资源约束下概率约束对线性约束的优越性和新算法的可行性. 相似文献
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采用有限单元方法,建立了质量慢变损伤转子系统动力学模型。将质量慢变转子系统推广为惯性损伤转子系统,研究了质量慢变转子系统相位突变导致的动力学响应问题,对比研究了不同碰摩程度下质量慢变转子 轴承系统孪生碰摩损伤非线性动力学响应,结合三维轴心轨迹,指出考虑了质量慢变因素的碰摩损伤转子 轴承系统时频响应特点。所得结果为惯性损伤转子系统动力学研究和故障诊断提供了理论参考。 相似文献