共查询到20条相似文献,搜索用时 734 毫秒
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结合目前发电厂的实际情况,开发了实用的发电厂元件保护整定计算软件.该软件采用模块化设计思想,整定计算过程采用分步计算原则,确保了整定计算的正确性和可靠性. 相似文献
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边坡稳定极限平衡分析软件研究 总被引:1,自引:0,他引:1
采用面向对象技术研制了一个边坡稳定极限平衡分析软件系统.该软件系统集成前处理建模、极限平衡分析计算和结果后处理于一体,具有类Windows风格.该软件自带绘图系统,前处理过程用对象化建模,界面友好,操作方便;后处理主要是计算结果分析和可视化图形显示,其界面形象、直观.笔者还给出了一个实际工程的算例验证了该软件的实用性. 相似文献
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阐述了Mathcad软件的特点和双曲线冷却塔筒理论曲线方程,提出了利用该软件本身的求解功能对双曲线冷却塔筒壁进行分节计算的方法,经与工程实例对比,计算所得各节冷却塔模板标高、半径、混凝土模板工程量等结果与工程实例吻合,说明采用该软件对冷却塔筒壁分节计算是可行的,可用于指导工程设计及施工. 相似文献
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避雷针是用于保护发电厂和变电所的设备。避雷针布置、保护范围的计算和绘图非常繁杂,且很容易出错,劳动强度较大,有必要开发防雷保护软件。该软件采用AutoLISP 和VB6. 0 编制,由3 部分组成:避雷针的布置距离、避雷针的防雷保护计算、保护范围图的绘制。该软件已先后用于几个工程的设计计算,提高了设计效率,减轻了设计人员的劳动强度,保证了设计质量,取得了较好的效果。 相似文献
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NEMA高效三相异步电动机,符合美国NEMA标准和加拿大标准;其效率指标符合美国能源法规定的高效节能电动机标准。因为生产及工艺的波动性比较大,直接影响到电机的效率及其它性能。根据实际生产情况,查找影响电机性能的主要问题,及时制定解决措施。 相似文献
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三相交流电动机的损耗可分为铜耗、铝耗、铁耗和杂散耗、风摩耗,前4种为发热损耗,其总和称为发热总损耗。阐述当功率从小到大变化时,铜耗、铝耗、铁耗、杂散耗对发热总损耗的比例变化。通过实例,铜耗和铝耗占发热总损耗的比例虽有波动,总体上由大变小,呈下降趋势。而铁耗杂散耗相反,虽有波动,总体上由小变大,呈上升趋势。功率足够大时,铁耗杂散耗超过了铜耗。有时杂散耗还超过了铜耗、铁耗,成为发热损耗的第一因素。再分析Y2电动机,以及观察各种损耗对总损耗的比例变化,揭示的规律类似。认识上述规律,得出不同功率电机降低温升和发热损耗的侧重点不同。对小电机,首先应降低铜耗;对中大功率电动机,应侧重降低铁耗杂散耗。认为"杂散耗比铜耗、铁耗要小得多"的观点是片面的。特别强调,电动机功率越大越要注意降低杂散损耗。中大容量电动机采用正弦绕组来降低谐波磁势及杂散耗,效果往往很好。而降低杂散损耗的各种措施,一般不需要增加有效材料。 相似文献
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简要介绍了NEMA超高效三相异步电动机的研发背景、主要技术参数、结构设计特点和关键技术,如采用优质硅钢片与退火工艺降低铁耗,低谐波绕组降低铜耗,特殊转子表面加工和酸洗工艺降低杂耗等,以及研制展望. 相似文献
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AC superconducting wire is being developed for such electrical equipment as superconducting transformers and superconducting generators. AC loss reduction is of primary concern in the development of such high-efficiency equipment. In reducing ac losses, it is necessary to develop assessment methods for ac loss in test samples which have shapes similar to the end-product equipment. This paper describes a least-square calculation of ac losses of superconducting wire as a function of frequency and magnetic field strength measured in test coils. Two sample solenoid coils were made to test the influence of different capacities and winding methods on ac losses in ac superconducting coils with rated capacities of 500 kVA and 20 kVA, and impregnated (epoxy resin) and nonimpregnated windings. The ac losses in the superconducting coils were measured by a calorimetric method using the evaporating rates of liquid helium. Estimated ac losses in the superconducting wire of the two coils were compared with Joule losses of copper conductors at ambient temperature. As a result of this comparison, a low-loss ac superconducting wire winding can be made for electrical equipment rather than employing conventional copper winding when used under low magnetic fields under 0.5 T. 相似文献
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AC superconducting wire is being developed for such electrical equipment as superconducting transformers and superconducting generators. AC loss reduction is of primary concern in the development of such high-efficiency equipment. In reducing ac losses, it is necessary to develop assessment methods for ac loss in test samples which have shapes similar to the end-product equipment. This paper described a least squares calculation of ac losses of superconducting wire as a function of frequency and magnetic field strength measured in test coils. Two sample solenoid coils were made to test the influence of different capacities and winding methods on ac losses in ac superconducting coils with rated capacities of 500 kVA and 20 kVA, and impregnated (epoxy resin) and nonimpregnated windings. The ac losses in the superconducting coils were measured by a calorimetric method using the evaporating rates of liquid helium. Estimated ac losses in the superconducting wire of the two coils were compared with Joule losses of copper conductors at ambient temperature. As a result of this comparison, a low-loss ac superconducting wire winding can be made for electrical equipment rather than employing conventional copper winding when used under low magnetic fields less than 0.5 T. 相似文献
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计入电晕损耗的潮流模型及计算 总被引:2,自引:0,他引:2
在超高压电网,电晕损耗是一种复杂,但不容忽视的现象。文中利用已有的电晕研究成果, 将电晕损耗作为有功负荷处理,从而首次将电晕损耗计入到潮流计算的数学模型之中,与传 统的潮流计算方法相比,网络的特性和迭代格式完全一致,所增加的计算量微不足道,但其 计算结果更加符合实际情况。 相似文献