共查询到20条相似文献,搜索用时 656 毫秒
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青海送变电工程公司在以往工程计算数据的基础上,利用计算机软件编程技术发展快、操作简单、运算快、精度高的优点,开发了涵盖牵张力和牵引力计算、弧垂计算、连续爬坡弧垂修正计算、布线计算等10项计算模块的张力放线计算软件,通过在张力放线计算软件中设置各计算参数计算公式,设计人性化的操作界面,按设定计算功能快速准确得出计算结果,在架线施工中得到了广泛应用,有效减少技术人员复杂繁琐的计算过程,提高了计算效率。 相似文献
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文中提出了电力物联网边缘计算终端的微服务建模与计算资源配置方法。首先,在提出的微服务架构基础上,建立了基础服务和聚合服务的时序逻辑模型。然后,提出了基于微服务的边缘计算终端计算资源配置方法,该方法采用计算资源供需模型刻画边缘计算终端为不同类型聚合服务供给计算资源,采用计算资源配置模型获得边缘计算终端的计算资源配置量和容器资源供给量。最后,仿真分析了容器资源垂直弹性伸缩率、聚合服务最大容忍延时和资源灵敏系数对计算资源配置的影响,给出了考虑多类聚合服务的计算资源配置结果。 相似文献
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1998年京津唐220 kV以上网络网损理论计算 总被引:1,自引:1,他引:0
通过介绍网损理论计算的意义,提出了京津唐220kV以上网损理论计算的范围,计算条件及计算方法,采用BPA潮流计算程序进行了京津唐220kV以上网络网损计算,在分析计算结果的基础上,提出了降低技术线损的四点措施。 相似文献
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实时理论线损计算分析系统是根据潮流计算的原理,实时计算出潮流分布,再根据潮流分布计算出理论线损,实时对全网的理论线损进行在线监测,克服了传统的离线方式事后计算带来的不及时.不精确.工作量大.只能计算代表日等诸多问题,减少了人为错误,提高了线损计算的及时性和准确度。通过对电网线损理论计算的分析,真正实现了理论线损全过程计算信息化管理。 相似文献
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Calculation of transient puffer pressure rise takes mechanical compression, nozzle ablation, and arc energy into consideration 总被引:1,自引:0,他引:1
Thermal puffer-type gas circuit breaker (GCB) has a high dielectric and current interruption capability. In order to design a good thermal puffer GCB, it is important to know the blast pressure for arc cooling. Although pressure calculation programs have been developed and used for design work, the basic characteristics, such as contribution of nozzle ablation gas to puffer pressure rise, amount of back flow gas to puffer chamber, and pressure distribution along gas passages during current interruption, are not well known. In this paper, pressure rise, mass flow, and temperature calculations were carried out using a new calculation model, which takes mechanical compression by puffer piston, nozzle ablation in the nozzle throat and arc energy into consideration. By analysis of the calculation results, we found the pressure rise mechanism is as follows. While fixed contact located in the divergent part of nozzle, all of the ablation gas generated from the nozzle wall cannot be exhausted from the nozzle and it leads to high-pressure generation in the nozzle throat. This pressure causes transfer of hot ablation gas back to the puffer chamber via gas passage. The puffer pressure increases thermally due to temperature rise by this mechanism. At a longer arcing time, as high puffer pressure was already established in the puffer chamber, the nozzle ablation gas cannot flow back to the puffer chamber. Besides as mass flow through nozzle is limited by low gas density, the puffer pressure rise is obtained by the mechanical compression of puffer piston. 相似文献
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Shin‐Ichi Tanaka Tsukasa Miyagi Toshiya Ohtaka Mikimasa Iwata Tadashi Amakawa Yutaka Goda 《Electrical Engineering in Japan》2011,174(4):9-18
This paper describes the phenomenon of internal pressure‐rise due to arcs ignited between metal rod electrodes in air. First, the internal pressure‐rises in a closed chamber due to arcs were measured at currents within the range of 1 to 12.5 kA. The rod electrodes were made of copper, iron, and aluminum, and were 20 mm in diameter. The measurements showed that the maximum pressure‐rise distinctly differed with each electrode material at the same total arc energy, namely, the maximum pressure‐rise was the highest in the case of the aluminum electrode and was the lowest in the case of the iron electrode. Next, to quantitatively verify this difference, the internal pressure‐rise was estimated, taking into account the energy balance in the closed chamber on each electrode material. It was found that the estimated pressure‐rise approximately agreed with the above experimental results by taking into consideration oxidation reactions of the electrodes, melting and vaporization of the electrodes, and radiation loss of the arcs under certain realistic assumptions. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 174(4): 9–18, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21071 相似文献
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大同烟煤增压富氧燃烧的热重实验研究 总被引:1,自引:0,他引:1
利用TherMax500型加压热天平研究了大同烟煤在增压富氧条件下的燃烧行为,主要考察压力对其燃烧特性的影响。实验结果表明,煤粉常压时的非均相着火,在中低压力下转变成均相着火,当压力增加到4 MPa后又逐渐向非均相着火过渡,并在6 MPa时完全转变成非均相着火。在均相燃烧时,随着压力的升高,挥发分燃烧速率逐渐加快,煤粉热解程度逐步加深。由于不同压力下着火方式的改变,煤粉的着火温度及燃尽温度并非随着压力的增加而单调变化,因而导致煤粉的综合燃烧特性指数S随着压力的增加先升高后降低。 相似文献
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中压开关柜内部电弧故障时有发生,其短时间释放出的巨大能量引起隔室内部压力迅速上升,对设备、建筑物以及工作人员的安全造成了严重威胁。基于零部件规则化和隔室等容积替代的简化原则,提出了开关柜复杂模型简化方法;利用CFD法计算了不同简化模型的压力分布规律,给出了模型最优简化方法;对SCM法与CFD法获得的计算结果进行了对比,分析了两者的差异。结果表明:采用规则化-等容积替代混合方式简化模型获得的结果与原始模型吻合较好,计算时间缩短了约54.39%;当泄压板打开后,隔室内部的压强分布差异较大,采用SCM法获得的结果误差较大,应采用CFD法进行求解。 相似文献
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压气式SF_6断路器在开断短路电流时压力特性的计算方法 总被引:1,自引:0,他引:1
本文提出了计算SF_6 GCB在开断短路电流时其压气室的温升和压力特性的一种方法,利用它可对压气室的压力进行定量分析,可供设计断路器时参考和对断路器的开断能力进行估算。 相似文献
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针对航空电机发热及散热受电机功率、结构,以及由于海拔高度改变带来的大气温度、粘度、压力变化等众多因素影响,温升模型难以准确建立的问题,通过已有试验数据,建立起遗传算法-神经网络表面温升模型,解决了遗传算法局部搜索能力差的问题,降低了神经网络陷入局部最小点的可能性。试验表明,该模型实现了对航空电机表面温升的智能预测。 相似文献
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针对航空电机发热及散热受电机功率、结构,以及由于海拔高度改变带来的大气温度、粘度、压力变化等众多因素影响,温升模型难以准确建立的问题,通过已有试验数据,建立起遗传算法-神经网络表面温升模型,解决了遗传算法局部搜索能力差的问题,降低了神经网络陷入局部最小点的可能性。试验表明,该模型实现了对航空电机表面温升的智能预测。 相似文献
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青印溪二级水电站用爆破膜代替调压井.进行了现场甩负荷试验,实测了蜗壳压力、机组转速升高、导叶开度的变化过程,分析了爆破膜的工作特性. 相似文献