高损耗电力变压器的节能改造

从资金角度出发阐述了对高损耗电力变压器改造为节能变压器，并从理论方面进行了可行性分析，改造后证明方案可行。     

整流变压器强油循环风冷系统的PLC控制

对整流变压器强油循环风冷系统进行PLC控制改造，冷却器随整流变压器的油温变化自动启停，解决了原来人工操作不能随气温的变化及时投切冷却器，造成电能浪费及整流变压器温升过高的问题。     

非晶合金变压器在环保楼低配改造中的应用

工矿企业选用低能耗配电变压器可以节约电能,从而获得可观的经济效益和社会效益。而非晶合金变压器比传统硅钢片变压器空载损耗下降60%以上,是变压器低配改造的绝佳选择。针对金隆铜业环保楼低配改造前的负荷状况,分析变压器的损耗组成,讨论了使用非晶变压器的节能情况、投资回报和相关政策问题,给出了改造后的使用效果及意义。     

35KV LF炉过电压分析及抑制技术研究

从现场测试结果看,切除空载LF炉变压器过电压是最严重的。本文对切除空载变压器过电压进行理论推导,对常规的LF炉过电压抑制技术进行电磁暂态ATP-EMPT仿真,仿真与实际测试结果一致,提出了一种改进型过电压抑制方法,并对此进行仿真,为系统改造提供了理论基础,改造后的系统,过电压抑制效果安全可靠。     

高线泵房密闭式变压器跳闸事故分析和改造

通过对密封变压器，及瓦斯继电器的动作原理分析，说明改造的必要性，防止急剧降温和渗漏油造成的跳闸预防措施。     

配电系统电能质量分析与节能改造

根据对金堆城钼业股份百花岭选矿厂磨浮车间配电系统及用电设备实际测量及分析计算情况,查找出该配电系统存在的主要问题,并结合配电系统节能改造理论,从优化电力负荷分配、无功补偿和抑制谐波三方面提出并实施该车间配电系统节能改造方案,改造后提升了供电可靠性,使变压器负荷率趋于合理,提高了功率因数,减少了无功补偿,消除了谐波损耗。     

120 MVA变压器冷却系统技术改造效果分析

针对邯钢120MVA变压器冷却系统存在的问题提出了改造措施以及注意事项，并结合效益分析介绍了改造效果。     

主降压变电站变压器的节能改造

通过对新型节能型有载调压变压器的技术研究和主降压老式变压器改造方案论证,成功地实施了节能改造,改造后降低了变压器的空载损耗,提高了变压器满载率,很大程度提高了输出电压稳定程度。为主降压变电所的可靠运行、节能降耗和日常维护提供了保证。     

BSC95变压器损耗智能测试仪

电力变压器是输、配、用电系统中最重要、数量最大的用电设备之一,变压器损耗测试是变压器节能检测、改造及变压器故障诊断中不可缺少的手段之一。 变压器智能损耗测试是一项复杂的工作,传统的测试方法需3台电压表、3台电流表、     

进口铝电解整流变压器总烃严重超标的原因及其消除

针对引进BBC公司铝电解整流变压器油中总烃含量严重超标问题，分析产生可燃性气体的原因，指出变压器内部存在的缺陷和故障部位，经过改造处理，消除了故障点，降低了油中产气速率，使之安全可靠运行。     

Study of High Temperature Deformation and Recrystallization in W9Mo3Cr4V Steel

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Analysis of High Temperature Deformed Structure and Dynamic Precipitation in W9Mo3Cr4V Steel

In recent years,high temperature deformationand recrystallization have been commonly studied incarbon and low alloy steels[1— 6] .Ref. [3]and Ref.[6 ]have investigated the behavior of hightemperature deformation and recrystallization inhigh speed steels. Using TEM and SEM,variousdeformed structures and sub- structures,dynamicrecrystallized nuclei and dynamic precipitation inW9Mo3Cr4 V steel were studied.1　 Experimental Procedure1.1　 Sample preparation　　 The material used is a commer…     

高 速 钢 中 的 碳 化 物 缺 陷

 大量碳化物的存在是高速钢组织的重要特征,也是影响高速钢质量和性能的关键因素。碳化物颗粒细小、形状规则和分布均匀的钢其质量和性能都好。但是,钢中的碳化物并不都这样理想,往往存在缺陷。根据对W18Cr4V、W6Mo5Cr4V2、W9Mo3Cr4V和W2Mo9Cr4VCo8等钢中碳化物的研究结果,分析了高速钢中常见的几种缺陷：①碳化物分布不均匀;②颗粒尺寸粗大,形状不规则,多为角状等;③碳化物微裂纹;④碳化物粘连等;⑤二次碳化物稀少。另外,还分析了以上碳化物缺陷产生的原因和危害性,并指出了减少缺陷应采取的措施。     

2.25Cr1Mo钢动态再结晶物理冶金模型的研究

??The hot compression tests of 2. 25Cr1Mo steel at 950-1200??, 0. 01-10s-1, and deformation of 60% were carried out on a Gleeble- 1500D simulator. The effects of deformation temperature and strain rate on the dynamic recrystallization of 2. 25Cr1Mo steel were investigated. The models for dynamic recrystallization critical strains and dynamic recrystallization fraction were established. The results show that 2. 25Cr1Mo steel is more likely to undergo dynamic recrystallization at high temperature and high strain rate. The deformation activation energy and critical strains in dynamic recrystallization as well as dynamic recrystallization fraction model of 2. 25Cr1Mo steel were obtained. The constitutive equation of 2. 25Cr1Mo steel was constructed and the dynamic recrystallization physical metallurgical model of finite element software data interface was established. The model provides the basic conditions for the forging microscopic simulation of large forgings.     

Carbides in high-speed steels containing silicon

The effects of silicon additions up to 3.5 wt pct on the as-cast carbides, as-quenched carbides, and as-tempered carbides of high-speed steels W3Mo2Cr4V, W6Mo5Cr4V2, and W9Mo3Cr4V were investigated. In order to further understand these effects, a Fe-16Mo-0.9C alloy was also studied. The results show that a critical content of silicon exists for the effects of silicon on the types and amount of eutectic carbides in the high-speed steels, which is about 3, 2, and 1 wt pct for W3Mo2Cr4V, W6Mo5Cr4V2, and W9Mo3Cr4V, respectively. When the silicon content exceeds the critical value, the M₂C eutectic carbide almost disappears in the tested high-speed steels. Silicon additions were found to raise the precipitate temperature of primary MC carbide in the melt of high-speed steels that contained d-ferrite, and hence increased the size of primary MC carbide. The precipitate temperature of primary MC carbide in the high-speed steels without d-ferrite, however, was almost not affected by the addition of silicon. It is found that silicon additions increase the amount of undis-solved M₆C carbide very obviously. The higher the tungsten content in the high-speed steels, the more apparent is the effect of silicon additions on the undissolved M₆C carbides. The amount of MC and M₂C temper precipitates is decreased in the W6Mo5Cr4V and W9Mo3Cr4V steels by the addition of silicon, but in the W3Mo2Cr4V steel, it rises to about 2.3 wt pct.     

2Cr11Mo1VNbN钢再结晶动力学方程及本构方程的建立

采用Gleeble-3800热模拟试验机,在温度为1 000~1 200℃、应变速率为0.01~1 s-1和变形量为70%的条件下研究了2Cr11Mo1VNbN钢的热变形行为,建立了动态再结晶型本构模型以及动态再结晶体积分数模型。结果表明:2Cr11Mo1VNbN钢在高温小应变速率的变形条件下易发生动态再结晶,计算得出2Cr11Mo1VNbN钢发生动态再结晶时的临界应变以及变形激活能并得到了动态再结晶体积分数模型,最终构建出的动态再结晶型本构方程能良好地描述2Cr11Mo1VNbN钢的高温流变行为。     

10Cr4Ni4Mo4V轴承钢的高温性能

１０Ｃｒ４Ｎｉ４Ｍｏ４Ｖ钢的高温接触疲劳、高温硬度和高温冲击性能的试验结果表明，该轴承钢具有良好的高温硬度和冲击韧性，因残余压应力较高，碳化物细小，分布均匀，在２００℃接触疲劳寿命高于Ｃｒ４Ｍｏ４Ｖ钢。     

Calculation and Analysis of Valence Electron Structure of Mo2C and V4C3 in Hot Working Die Steel

Taking the hot working die steel （HWDS） 4Cr3Mo2NbVNi as an example, the phase electron structures （PES） and the biphase interface electron structures （BIES） of Mo2C and V4 C3 , which are two kinds of important carbides precipitated during tempering in steel were calculated, on the basis of the empirical electron theory of solids and molecules and the improved TFD theory. The influence of Mo2 C and V4 C3 on the mechanical properties of HWDS has been analyzed at electron structure level, and the fundamental reason that the characteristic of the PES and the BIES of carbides decides the behavior of them has been revealed.     

高速列车车轴钢30NiCrMoV12的热变形行为

通过Φ250 mm锻件切取的试样在Gleeble-3500热模拟机于850~1150℃以应变速率0.01~10s^-1对高速列车车轴钢30NiCrMoV12(/%:0.26C,0.33Si,0.62Mn,3.01Ni,0.82Cr,0.56Mo,0.10V)进行了热压缩试验。研究了车轴钢在热变形过程中奥氏体变形行为及再结晶规律,确定了车轴钢的热变形方程,建立应变量ε为0.5和0.9的热加工图。结果表明,在应变速率一定时,温度越高,变形量越大,则越有利于动态再结晶的发生;随着温度升高以及应变速率降低,能量耗散效率η逐渐升高;当真应变0.5,温度1100℃,应变速率0.01 s^-1时,变形能量耗散效率达到最大值0.41。该车轴钢在1000~1150℃,应变速率0.01~1.0s^-1时,具有较好的可锻性。     

W9Mo3Cr4V钢的超细化处理

采用不同的工艺参数,对Ｗ９Ｍｏ３Ｃｒ４Ｖ钢进行高温变形,获得了一种超细的再结晶组织。进一步分析了产生这种超细组织的原因和条件,为高合金钢的超细化处理提出了一种有效的方法。