共查询到20条相似文献,搜索用时 9 毫秒
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S. Yu. L’vov E. O. Lyut’ko V. N. Bondareva V. B. Komarov Yu. N. L’vov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2012,45(5):385-391
The radiational-thermal development of coil short circuits due to the action of partial discharges of the first kind when
the windings of transformers, autotransformers and shunting reactors become contaminated with metal-containing colloidal particles,
formed in the transformer oil as a result of the interaction of the oil with the constructional materials (the copper of the
windings, the iron of the tank, the core etc.) is considered. Acriterion of dangerous contamination of the coil insulation
of the windings by metal-containing colloidal particles is proposed, namely, 3% of the mass content of copper and iron in
it, which, if exceeded, may serve as a basis for recognizing the state of transformers, autotransformers and shunting reactors
at a voltage of 110 kV and above the limit. It is shown that filters for continuously cleaning the oil play a considerable
role in prolonging the life of transformer equipment. 相似文献
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分析电厂油浸电力变压器的构成及火灾危险性,介绍了水喷雾灭火系统设计资料收集和参数确定,结合某电厂油浸电力变压器水喷雾灭火系统设计实例,提出系统设计中应注意的问题。 相似文献
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变压器能否节能运行,关系到供电企业的节能效益。通过定性、定量分析,得出变压器在变压和传递电功率的过程中所产生的损耗,提出了影响变压器经济运行的因素及采取经济运行的方法。 相似文献
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M. Yu. L’vov K. M. Antipov Yu. N. L’vov L. G. Mamikonyants V. B. Komarov S. V. Tsurpal L. N. Shifrin Yu. A. Dement’ev 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):113-118
The main indicators of the limit technical state of transformers and autotransformers, for which their further use is impermissible
or inadvisable, are considered. The main elements of a power transformer which determine its limit state are the windings
and the cores. Important indicators for estimating the technical state of the windings is the wear of the coil insulation,
the degree of mechanical fastening of the windings and, in particular, the absence of dangerous deformations. Wear of the
coil insulation is estimated from the degree of polymerization and the short-circuit resistance. The cores of the transformer
become damaged fairly rapidly during operation. Normalized values of the above indicators are given as well as experience
in using them in the Russian Federation and the Ukraine to estimate the limit state of transformers and autotransformers.
The amount of inspection in order to reach conclusions on the technical state of a transformer and temporary measures until
they are replaced are indicated.
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Translated from élektricheskie Stantsii, No. 1, pp. 44–49, 2008. 相似文献
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M. Yu. L’vov Yu. N. L’vov Yu. A. Dement’ev K. M. Antipov A. S. Surba P. A. Sheiko B. N. Neklepaev L. N. Shifrin S. D. Kassikhin A. Z. Slavinskii K. G. Sipilkin 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2006,40(1):55-60
The failure rate and experience of operation of power network transformers and autotransformers are analyzed. After analysis
of the failure rate assemblies with elevated vulnerability to damage are determined and engineering solutions employed by
the electrical industry for raising their reliability are described.
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Translated from élektricheskie Stantsii, No. 11, November 2005, pp. 69–78. 相似文献
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电力变压器是发电厂、变电站的主要电气设备,担负着传输电能、分配电能、降低损耗、实行经济运行的重大使命。电力变压器能否安全可靠地运行,事关整个电网的安全和稳定。而过电压现象正是威胁变压器稳定运行的因素之一,必须加以重视。了解过电压的产生原因、危害以及过电压保护的措施,可为实际工程中变压器安全可靠运行提供依据。 相似文献
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为了使变压器安全运行,预防性试验是必不可少的有效措施,对变压器故障分析和诊断具有确定性因素,实践证明,对变压器通过各种预防性试验测试,从而能准确的判断变压器的故障,本文主要介绍了电力变压器预防性试验的主要检测内容。 相似文献
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介绍了豆坝电厂#4变压器的主要技术参数和变压器正常情况下在周期性取油样检测中所发现的油样异常现象.利用色谱法对绝缘油中的溶解气体含量进行了分析,综合电气试验、运行、检修等情况,确定了变压器内低压软连片放电是导致变压器油异常的主要原因.介绍了判断变压器油出现异常的三比值法,进而判断故障性质、部位和严重程度,并提出了为确保电网的安全运行应该采取的处理措施. 相似文献
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分析了华能海门电厂一期1000MW机组启动备用变压器油纸电容式高压套管单圆玻璃油位计漏油故障的具体原因,提出了解决漏油的方法,可供处理同类型故障时参考。 相似文献
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华电内蒙古能源有限公司包头发电分公司公司#2机组B相主变压器投运后,在定期进行油中溶解气体色谱分析时,发现总烃的体积分数不断上升,绝对产气速率超过注意值,判断为变压器内部高温过热故障。通过多次检修及返厂处理,最终发现并排除了故障,保证了设备安全、稳定运行。 相似文献
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接地装置是保证人身安全以及电力设备和过电压保护装置正常工作的非常重要的环节。接地电阻的指标量又是解决电力系统接地技术的关键。本文比较分析了降低水力发电厂、变电所接地装置接地电阻方法的同时,提出相应的技术措施。 相似文献
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通过实例分析了变压器差动保护误动作产生的原因和改进措施。为确保变压器安全运行,检查其差动保护定值和接线是否正确是必要的技术措施,说明了正确进行整定计算和完善无误的接线对避免变压器差动保护误动作中的重要性。 相似文献
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随着电力工业的发展,许多中、小型电厂需要扩大生产规模,扩建新机组,往往形成新厂、老厂共存的格局。为了与系统电网相联,也为了新厂、老厂互为备用电源以及运行方式上的灵活,人们常常希望新厂与老厂的主变压器之间能够互联,并接入系统电网,但是由于新厂、老厂的设备状况不同,其运行方式往往已成定式,所以使现场情况变得比较复杂,若不进行认真的技术论证,深入分析现场的具体情况,确定科学合理的接线方案,往往会造成技术上的失误及经济上的巨大损失. 相似文献