共查询到20条相似文献,搜索用时 78 毫秒
1.
对非晶合金立体卷铁心干式变压器与硅钢立体卷铁心干式变压器的概况、差异、市场供求等方面进行了阐述,分析了这两种变压器的优点和缺点。目前,国网、南网变压器采购呈现以硅钢变压器为主、非晶合金变压器为辅的结构。非晶合金立体卷铁心干式变压器与硅钢立体卷铁心干式变压器形成优势互补、相互协作是目前的发展模式。 相似文献
2.
矿产资源是国家的重要资源,矿山设备的安全性与稳定性决定着采矿作业的效率,为此提出基于电气控制的矿山设备干式变压器结构技术性能比较研究。干式变压器结构技术性能比较主要对树脂浇注式干式变压器与浸漆式干式变压器的耐受短路性能、绝缘耐压性能、耐热阻燃性能、过载性能与耐腐蚀性能进行比较,通过比较分析发现浸漆式干式变压器结构技术性能优于树脂浇注式干式变压器,因此在采矿作业推广浸漆式干式变压器的使用。 相似文献
3.
针对油浸式变压器的结构缺点和常见故障,介绍了干式节能变压器的性能特点和突出优点,探讨了干式节能变压器应用中有关技术和设计问题,论证了干式节能变压器的节能应用前景。 相似文献
4.
光亮炉电热调功干式变压器是炉子的关键设备,由于外方提供资料不合理及诸多原因,造成了干式变压器在运行中严重发热,直接影响了试生产。为此,对干式变压器发热原因进行了多方面的研究分析,并对变压器及周围条件进行改进,目前,干式变压器基本上满足了生产运行要求。 相似文献
5.
6.
本文介绍干式变压器的温度控制、防护方式、冷却方式及低压出线方式等特点,以及新型干式变压器的发展方向和应用领域。 相似文献
8.
介绍了绕包式,浇注式,H级绝缘非包封式三种干式变压器线圈绝缘结构类型及各自的性能特点,对中小型干式变压器制造的发展趋势进行了分析. 相似文献
9.
文章介绍了为除尘器供电的干式电力变压器发生的一起隐性故障案例。对干式变压器日常维护及测试工作的规程进行了梳理,以期早期发现并处理类似隐性故障,减少因变压器故障造成不必要的供电中断和系统的被迫停运。 相似文献
10.
11.
12.
13.
14.
15.
16.
An attempt has been made to examine the effect of Cu addition in low carbon Ti ‐ B microalloyed steel on their continuous cooling transformation behaviour by dilatometric study. It has been demonstrated that addition of Cu by an amount of 1.5 wt% in Ti – B microalloyed steel effectively lowers the transformation start temperature. Addition of Ni (0.79 wt%) in 1.5 wt% Cu‐added Ti–B microalloyed samples further lowers the transformation temperature of austenite even at cooling rates comparable with air ‐ cooling condition. The microstructural investigation of the samples subjected to the dilatometric study under different cooling rates suggests the possibility of obtaining pearlite free multiphase microstructures in 1.5 wt% Cu – and 0.79 wt% Ni – added Ti – B microalloyed steel by air – cooling from the austenite region. 相似文献
17.
根据某空压站冷却系统中存在的问题,利用传热学的理论及方法,对两种不同类型的换热器进行了热力计算,结果表明:换热器的种类不是制约中冷器冷却效果的关键因素,而采取降低热阻的措施可以改善冷却效果进而提高空压机出力,降低生产能耗。 相似文献
18.
19.
GUO Fei ZHAO Xian-ming WANG Li-na WU Di WANG Guo-dong NING Zhong-liang 《钢铁研究学报(英文版)》2013,20(8):60-65
Based on ANSYS, an analytical model was established for H-beam during controlled cooling. The temperature fields during controlled cooling and air cooling were analyzed and the microstructure and mechanical properties for different parts of H-beam were discussed in detail. After the H-beam was controlled cooled for 4. 5 s, its mean surface temperature decreased from 850 to 460 °C, and the lowest and the highest temperatures were measured at edge of flange and at R corner, respectively. Whereas, for the H-beam air-cooled for 30 s, the mean temperature at R corner and web was 700 and 540 °C, respectively. The microstructures for different parts of H-beam consisted of ferrite and pearlite, and the grain size at R corner was coarser than those at flange and web. The difference of yield and tensile strengths of web, flange and R corner was within 30 MPa, and the elongation was similar. The changes of microstructure were in good agreement with that of temperature field. In addition, the results show that the uniformity of microstructure and mechanical properties can be improved by increasing water flow rate at R corner. 相似文献
20.
汽轮发电机在开机并网时,经常由于定、转子绕组轻度受潮而导致绝缘不合格,延误开机并网的正常进行。探讨了一种应急干燥方法,解决闭式循环空冷汽轮发电机在开机并网时因绕组干燥问题而导致的绝缘不合格,实现顺利开机并网。 相似文献