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本文给出了用镜像法计算变压器漏电抗的解析表达式,并实际计算了两台大型变压器的漏电抗。计算表明,用本文给出的算式计算变压器的漏电抗,具有编程简单,计算存储量小,计算时间短,计算精度较高等优点。 相似文献
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杨平 《哈尔滨电工学院学报》1994,17(4):319-324
本文给出了用镜像法计算变压器漏电抗的解析表达式,并实际计算了两台大型变压器的漏电抗。计算表明,用本文给出的算式计算变压器的漏电抗,具有编程简单,计算存储量小,计算时间短,计算精度较高等优点。 相似文献
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介绍了计算平衡变压器输出阻抗的一般方法,给出了利用变压器短路试验数据计算平衡变压器输出阻抗的原理、方法和程序,并对SFQY一20000/110平衡变压器的输出阻抗进行了计算。 相似文献
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自然冷却高燃点油变压器温升计算方法 总被引:1,自引:1,他引:1
高燃点油变压器以其优越的防火减灾功能越来越受到用户的青睐。由于高燃点油的热物性与变压器油有很大的不同,粘度远高于变压器油,不能应用现有的变压器温升计算方法来计算高燃点油变压器的温升。文中根据传热学基本原理提出了一套计算高燃点油变压器温升的计算方法,用以计算高燃点油变压器平均油温升、顶油温升、绕阻温升等。计算结果与试验值吻合良好,可以满足工程设计计算需要。这为高燃点油变压器的研制开发提供了一种热设计的新方法。 相似文献
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分频输电系统的数字仿真研究 总被引:4,自引:1,他引:4
对分频输电系统的稳态运行方式进行了理论分析和数字仿真计算,利用数字计算结果说明了分频输电及倍频变压器的工作机理。此外,还分析了倍频变压器的损耗及效率,确认了参考文献中关于倍频变压器效率可达95%以上的论断。功角特性的仿真计算结果表明,倍频变压器可工作在反向功率情况下,即倍频变压器可用作分频变压器,从而大大扩展了分频输电方式的应用范围。 相似文献
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变压器技术参数是分析计算变压器经济运行的基础数据,变压器经济运行是寻求变压器运行中降低变压器的有功功率和提高其运行效率,即降低变压器损耗率,以及降低变压器的无功功率损耗和提高变压器电源侧的功率因数。通过对变压器有功功率损耗和无功功率损耗(综合功率)的计算、分析,得出变电站变压器经济运行方式的定量计算式,继而得到变压器经济负载系数判别式。对330kV定西变容量为150MVA的变压器进行经济运行方式安排和最佳经济负载系统计算,达到变压器经济运行和降低网损的目的。 相似文献
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概述了整流变压器负载损耗试验及计算特点,列出了常用整流变压器联结方式的试验方法,并指出了整流变压器载损耗试验及计算应注意的问题。 相似文献
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Specially connected transformers such as V–V, Scott and Le-Blanc transformers are used to convert a three-phase supply into one or two single-phase supplies. These transformers are commonly used in the electro locomotive traction systems. This paper investigates the harmonic cancellation characteristics of such transformers. The results show that when two harmonic-producing loads are connected to each single-phase side of the transformers, the harmonics produced by the loads will cancel out at the primary sides of the transformers. The amount of cancellation is affected by transformer type and harmonic order. The study is performed for seven types of specially connected transformers. 相似文献
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《International Journal of Electrical Power & Energy Systems》2013,45(1):495-505
This paper proposes an intelligence based protective relay data acquisition system to correct current transformers and capacitive voltage transformers secondary waveform distortions. The protective relay data acquisition system receives voltage and current signals from current transformers and capacitive voltage transformers and prepares the inputs to the main board after some pre-processing. Current transformers and capacitive voltage transformers provide instrument level current and voltage signals to meters and protective relays in high voltage and extra high voltage systems. The accuracy and performance of protective relays in high voltage and extra high voltage systems are directly related to steady state and transient performance of current transformers and capacitive voltage transformers. Current transformers saturation and capacitive voltage transformers transient could lead to protective relay mal-operation or even prevent tripping. The key of the proposed scheme is to use artificial neural network to achieve the inverse transfer functions of current transformers and capacitive voltage transformers. Simulation studies are preformed and the impacts of changing different parameters are studied. Performance study results show that the proposed scheme is accurate and reliable. The proposed algorithm has also been implemented and tested on a digital signal processor board. Details of the implementation and experimental studies are provided in the paper. 相似文献
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Power transformer differential protection has been used for decades on standard three-phase power transformers. However, special industrial transformers, such as 24-pulse converter transformers, could not typically be protected easily with the standard power transformer differential relays. The main reason is the nonstandard phase angle shift of 24-pulse converter transformers. Such 24-pulse converter transformers are often used in industrial and railway applications. This paper will show that it is possible to provide differential protection for such special transformers by using standard numerical transformer differential protection relays and external interposing current transformers (CTs). However, the external interposing CTs can be designed in a standardized way. This approach will significantly simplify the application of differential protection for special industrial transformers. 相似文献
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220kV及以上变压器可靠性分析 总被引:7,自引:1,他引:7
对220kV及以上进口变压器与国产变压器的可靠性指标做了比较分析,指出国产变压器可靠性指标近年来取得明显进步,1995年国产变压器的可用系数与进口变压器相当。文中还介绍了导致变压器非计划停运的故障部位。 相似文献
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通过对非晶合金铁心变压器与S11型变压器的技术性能及经济效益进行比较,阐明非晶合金铁心变压器的节能优势在技术性能上,非晶合金铁心变压器的空载损耗和有功损耗比S11型变压器低;在经济效益上,非晶合金铁心变压器的寿命比S11型变压器长5.5年左右。 相似文献
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220kV有载调压高阻抗变压器的设计 总被引:3,自引:3,他引:0
介绍了220kV三相三绕组有载调压高阻抗变压器的设计特点,列出了该类产品的主要性能参数,给出特殊高阻抗的计算方法,并将该类高阻抗产品与常规普通阻抗产品进行了对比分析。 相似文献