共查询到19条相似文献,搜索用时 31 毫秒
1.
2.
刘华钢 《电网与水力发电进展》1995,(2)
本文介绍了自调整式的发电机定子接地微机保护装置的研制及其动摸试验结果,着重介绍了保护装置的硬件结构和软件结构及其主要功能,以及保护装置的可靠性和抗干扰性能,从动模实验上证明了自调整式的发电机定子接地微机保护装置的优良性能,为保护装置的推广应用提供了条件。 相似文献
3.
4.
介绍了390H全氢冷发电机结构特点,分析了定子线圈端部接地故障的原因,采取了合理的修复措施,提出日常维护中需加强定子槽楔和铁芯紧密度的检查. 相似文献
5.
介绍了FD5—3000型风力发电机组的控制、保护及主要特点。还介绍了此风力发电机组多台联网以及与柴油发电机组或太阳能发电机组互补运行,组成24h不间断电源的方法。 相似文献
6.
7.
介绍了JF204C型牵引发电机定子断线故障的处理方法,对及时消除故障、降低机破率、确保DF11型机车安全运行具有重要意义。 相似文献
8.
9.
10.
针对HXN5型机车主发电机风道批量出现裂纹的问题,从设计、工艺及运用环境等方面分析了裂纹产生的原因,提出了主发电机风道的改进设计方案,并用有限元分析方法对原型及改进型设计进行了模态分析及CFD流场计算,验证改进效果。实践证明,改进后效果良好,主发电机风道再未出现裂纹。 相似文献
11.
通过对非洲某国电站发电机的中性点接地方式进行分析,对发电机中性点接地变压器的选型进行了工程计算,指出发电机中性点接地变压器的参数选择须与发电机定子接地保护相配合。在发电机定子绕组绝缘有较高安全系数的情况下,接地电阻的选取应主要满足限制接地故障电流及与定子接地保护配合的需要。 相似文献
12.
现在循环流化床锅炉自控系统普遍采用集散型控制系统(DCS)。本文以河南神马尼龙化工有限责任公司动力厂3#锅炉为例,介绍了CENTUM-CS3000集散型控制系统的配置及其功能,并从循环流化床锅炉的控制方式、控制水平、联锁、安全保护、一般的控制操作等方面介绍了DCS在循环流化床锅炉控制中的成功应用。 相似文献
13.
14.
1 接地试灯电路原理与作用 为了检查机车电路有无接地故障或查找机车电器故障,在机车上装有两个110V、8W的接地试灯,即1DD、2DD。1DD的一端与蓄电池的正端相接,称为正灯,2DD的一端与蓄电池的负端相接,称为负灯。将正负试灯插销插入插座,通过车体将两个试灯串联在一起。正常 相似文献
15.
Sang-Bin Lee Habetler T.G. Harley R.G. Gritter D.J. 《Energy Conversion, IEEE Transaction on》2002,17(1):7-15
In this paper, the feasibility of using an estimate of the stator resistance (Rs) as an indicator of stator winding temperature (Ts) is evaluated. The advantages of resistance-based temperature monitoring over conventional thermal model-based methods are presented. Since obtaining an accurate estimate of Rs is critical for this approach, an investigation of existing Rs estimation schemes, and an analysis showing the sensitivity of model-based Rs estimation due to the uncertainties in motor parameters and variables, are given. It is shown that Rs estimation is difficult during high-speed operation, because estimated R s becomes sensitive to errors in motor electrical parameters and variables, as the input excitation frequency (speed) increases. A new Rs estimation scheme for the purpose of monitoring the temperature in steady state is proposed. Experimental results on a line-connected induction machine verify the validity of the proposed method and the analysis 相似文献
16.
17.
Stator bars subjected to operating stresses for 7 and 22 year periods were retrieved from a hydrogenerator to undergo short term electrical diagnostic tests in order to determine whether any significant aging of the insulation had taken place. The AC breakdown voltage (Ubk), partial discharge inception voltage (PDIV), the maximum charge (ΔQm) and total apparent charge (ΣjnΔQj) transfer of the partial discharges, tanδ and tanδ tip-up comprised the measured quantities statistically evaluated in the diagnostic test procedure. The AC breakdown voltage, PDIV and Δ&thetas;m were found to exhibit a systematic trend with in-service time, thereby suggesting the occurrence of aging effects. That is, both the AC breakdown voltage and the PDIV were characterized by a decrease with time in-service, whilst the ΔQ m value exhibited an increase. However, no definite behavior was evinced by the (ΣjnΔQj), tanδ and tanδ tip-up values. The significance of the diagnostic test results is discussed in terms of Weibull statistics and the partial discharge behavior with time 相似文献
18.
介绍了超临界汽轮机9Cr-1Mo高压内缸补焊试验研究,制定了合理的工艺,已应用于超临界机组汽缸焊接生产。 相似文献
19.
A method to calculate circulating currents in the bars, especially double Roebel bars of the stator winding of synchronous machines is presented, different physical modeling is discussed, and results of calculations and measurements are explained. In synchronous machines, especially in large turbogenerators with direct water cooling of the stator winding, the bars consist often of two simple Roebel bars integrated in a double bar (twin bar). In these bars, circulating currents produce local losses which may lead to an overheating of the cooling medium. Double Roebel bars with cross transpositions avoid such overheating. 相似文献