变压器过热故障的判定方法与实践

为提高对变压器过热故障判定的准确率,快速查找并排除故障,保障变压器的正常运行,通过变压器的定期预防性试验,发现故障,根据对油品进行的色谱分析及可能因素的判别,判断该变压器的故障种类,最后经试验确定故障部位,得出一个可借鉴的检测方法,并在实践中得到认定。     

一起变压器内部过热性故障分析

变压器的过热故障在变压器运行故障中占很大比例,它会严重影响变压器的正常运行.通过气相色谱对一台66 kV主变压器的油气体分析发现内部存在过热性故障,结合其他电气预防性试验数据,经过综合分析和查找确认,找出了与实际相符的故障部位,排除了潜伏性故障.     

冶金企业电力变压器高压试验故障诊断方法研究

冶金企业生产中,变压器的作用是非常重要的,一旦发生故障,对企业电力系统的稳定运行起到关键影响。电力变压器高压试验主要是为了检测变压器等电器设备的安全品质而进行的,其试验水平的高低对保障稳定的电力供应有着十分重大的影响,同时还关系到企业的直接经济效益。为了有效降低电力系统中安全事故的产生,我们必须做好对电力变压器的高压试验。在日常运行维护中电气点检作业区应该加强对变压器故障的诊断。在变压器的运行过程中,对于由于环境因素而造成的影响应该进行非常全面的思考,按照操作规程要求定期做好各项试验和全面的检查,并且对可能出现的原因进行分析,采取行之有效的方法将问题解决,保证变压器始终处于正常的运行状态。在这篇文章中主要对变压器的高压试验以及故障的具体诊断方法进行研究。     

一起110kV主变压器近区短路故障分析及措施探讨

介绍了一起110kV主变压器因近区短路发生的故障跳闸情况,通过对试验结果、故障原因的分析,提出变压器发生近区短路冲击后的"四测分析法",并通过实例分析证实了该方法的实用性、有效性。     

变压器内析出气体的分析

目前,在对变压器故障的诊断分析中,单靠电气试验往往很难发现某些局部故障和发热缺陷,而利用变压器油中气体色谱分析这种化学检测的方法,预测变压器     

冶金电力变压器现场试验及故障的分析判断

分析了冶金电力变压器运行的特点,根据电力设备预防性试验规程的规定,结合变压器现场电气试验的特点,对冶金电力变压器现场试验项目、周期和故障判断进行分析论述,具有很好的实际意义。     

电力变压器的安全运行及探讨

介绍了电力变压器在运行过程中的常见故障，根据不同的故障现象，装设不同的变压器保护装置，并对变压器的过电流保护装置进行了详细分析，对电力系统的安全运行及生产具有指导意义。     

色谱分析法在EAF变压器局部热故障分析中的应用

色谱技术是近年来兴起的一项新技术，能够对运行中的变压器进行监测，通过采集变压器箱体内的少量油样，分析油中气体的组分及其含量，就可以判断变压器是否存在故障、故障的性质以及故障的大致部位。介绍了色谱分析技术在炼钢厂EAF变压器故障分析中的应用。     

变压器故障的简单诊断方法

叙述了变压器常见的8种故障，日常点检对故障采取的对策，以及对变压器故障诊断的方法和处理意见。     

单相三线圈变压器在铁合金矿热炉上的应用

介绍了三线圈变压器构造原理，并对单相三线圈变压器运行作了详细的分析，特别对运行中的效率计算和故障维护方法作了进一步探讨。     

用油气相色谱分析判断变压器故障

本文论述了利用变压器油气相色谱分析技术判断变压器内部潜伏性故障的原理，并就典型实例通过运用几种不同方法去判断，验证其准确性。     

Fault Rupture Propagation through Sand: Finite-Element Analysis and Validation through Centrifuge Experiments

The three notorious earthquakes of 1999 in Turkey (Kocaeli and Düzce) and Taiwan (Chi-Chi), having offered numerous examples of surface fault rupturing underneath civil engineering structures, prompted increased interest in the subject. This paper develops a nonlinear finite-element methodology to study dip–slip (“normal” and “reverse”) fault rupture propagation through sand. The procedure is verified through successful Class A predictions of four centrifuge model tests. The validated methodology is then utilized in a parametric study of fault rupture propagation through sand. Emphasis is given to results of engineering significance, such as: (1) the location of fault outcropping; (2) the vertical displacement profile of the ground surface; and (3) the minimum fault offset at bedrock necessary for the rupture to reach the ground surface. The analysis shows that dip–slip faults refract at the soil–rock interface, initially increasing in dip. Normal faults may keep increasing their dip as they approach the ground surface, as a function of the peak friction angle φp and the angle of dilation ψp. In contrast, reverse faults tend to decrease in dip, as they emerge on the ground surface. For small values of the base fault offset, h, relative to the soil thickness, H, a dip–slip rupture cannot propagate all the way to the surface. The h/H ratio required for outcropping is an increasing function of soil “ductility.” Reverse faults require significantly higher h/H to outcrop, compared to normal faults. When the rupture outcrops, the height of the fault scrap, s, also depends on soil ductility.     

基于色谱分析法的变压器故障诊断技术及其应用

对电力变压器的常见内部故障进行阐述与分析,给出运行状态下变压器主要的测试与检测手段。对基于色谱分析法的故障诊断技术给出了方法,并通过对首钢京唐220 kV级变压器含有氢气的故障分析及处理,说明变压器故障诊断除了色谱分析数据外,还要结合现场实际、设备运行情况,才能进行准确的判断。     

胶东牟乳成矿带板块碰撞成矿作用及找矿方向

胶东牟乳成矿带位于山东半岛的东部,控矿构造为一系列近似平行且等间距的NNE向的断层.对胶东胶莱盆地、东西向构造、牟乳成矿带及其西部变质核杂岩区的金矿床的控矿构造特征进行了研究,并对牟乳成矿带及其西部变质杂岩区的金矿床的成矿时代、地球化学特征进行了对比.研究表明,胶东胶莱盆地、东西向断裂、牟乳成矿带及其西部变质核杂岩区金...     

Interaction of Shallow Foundations with Reverse Faults

A series of centrifuge model tests is reported that investigated the effects of foundation position on the interaction of reverse, dip-slip faults with shallow foundations resting on sand. The model tests have allowed careful examination of both the soil and foundation deformation as a shear localization (fault) propagates through a 15?m thick sand layer for fault throws up to 5?m. By comparing results of the tests with foundations present with those from a “free-field” test, the effect of the foundation on the faulting pattern has been observed directly. The response of the foundation is very sensitive to the exact position of the fault and even when the fault emerged remotely from the foundation it sometimes caused significant foundation movements. Detailed results are presented for the tests and it is suggested that these results are used as: (1) indications of likely foundation–soil–fault interaction mechanisms; and (2) to allow future validation of numerical models for similar problems. Finally, foundation rotations measured during the fault–foundation interaction tests are compared to those predicted using a simple method based on free-field soil displacements. This simple method makes surprisingly good prediction of maximum fault rotations for different throws.     

康明斯K2000E发动机电控系统故障诊断及处理

康明斯K2000E发动机采用电子系统进行控制,发动机出现机械故障时,可直接读取故障代码发现故障原因,进行处理。当发动机出现电控系统故障时,修理人员会出现故障判断失误,因此进行故障处理时要采用正确的思路和方法。     

高线轧机机械传动系统典型故障解析

高速线材轧机由于转速较高,其机械传动系统易出现突发故障。由于该类齿轮箱的结构特点及故障类型的差异性,采用时域分析和频谱分析的适应性有所差异。通过实测数据的分析表明,轴承类故障对于高阶的时域分析指标异常敏感,而在常见的齿轮箱故障中,转轴类零部件故障的识别和判断难度相对较高。     

轴向柱塞泵故障的模糊诊断

利用模糊综合评判的方法对轴向柱塞泵进行故障诊断,能在液压泵多种可能的故障中找出可能性较大故障,可得到准确的结论.     

棒线裙板中继故障的解决方法

裙板中继故障是棒材生产线的一种主要故障,发生频繁、故障较难预测,同时处理时间较长,对生产影响较大。文章介绍了描述了八钢2#棒材裙板中继故障的解决办法,较好解决了此故障。