共查询到20条相似文献,搜索用时 53 毫秒
1.
2.
正评价配电变压器的技术经济性能,科学计算采用节能变压器的节能效益,以便选择最经济、合理的变压器。在新建、扩建工程选用配电变压器及老旧变压器更新改造时,都会遇到如何评价配电变压器的技术经济性能,如何科学计算采用节能变压器的节能效益,以便选择最经济、合理的变压器(型号、容量)等问题。《配电变压器能效技术经济评价导则》参考了国际上的部分标准,在综合分析和考虑我国配电变压器实际应用的基础上,提出了适用于我国具体情况的评价方法。 相似文献
3.
4.
配电网中拥有众多变压器且容量大,进行配电变压器的节能降耗研究是很有必要的。对某商用大楼的配电变压器能耗现状进行分析,通过理论计算,从运行方式、减少三相不平衡、调整运行电压、减小负荷波动、无功补偿、更换变压器等的节能效果进行对比,提出了配电变压器节能优化改造方案。 相似文献
5.
6.
该文介绍了近50年中变压器铁心材料的发展,目前,非结晶钢片的单位铁损比热轧硅钢片降低了近20倍,并以10kV级,200kVA规格配电变压器为例,给出了不同损耗的变压器在不同负载系数下的效率曲线,指出在日常运行中,要得到高效运行的变压器,就必须选择合适的损耗比值,最后,列表对200kVA非晶农用配电变压器和S9配电变压器的各项费用作了比较。 相似文献
7.
8.
9.
推广节能降耗产品高效电动机与节能变压器由于节能效果明显,其开发与应用是目前国际上的发展趋势。美国能源部和环保署于1998年共同发起了推广高效低损耗配电变压器的“能源之星变压器计划”。该计划是一项鼓励电力企业在配电系统中采用高效低损耗配电变压器的自愿节能计划。美 相似文献
10.
正江苏华鹏变压器有限公司,全国机械工业质量奖的得主,是国家定点生产电力变压器和特种变压器的专业制造企业,是输变电设备领域的骨干企业。为完成国家"十二五"计划的节能减排目标要求,国家发改委、工信部、财政部将"高效节能配电变压器"列入国家惠民工程,对用户给予财政补贴,以促进高效节能配电变压器推广应用。华鹏积极响应国家政策要求,在参与高效节能变压器国家标准制定的同时,也加快了高效节能变压器的研制。截止到目前,江苏华鹏已有48个油浸式产品、38个干变产品被列入节能产品惠民工程高效节能配电变压器推广目录。公司将积极响应国家能源政策的要求,为电力用户提供 相似文献
11.
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
12.
13.
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
14.
15.
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
16.
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
17.
18.
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
19.
20.
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