| 1. | The negative sequence current of impedance - matching balance transformer
阻抗匹配平衡变压器的负序电流 |
| 2. | Study of relations between performances of products and impedance - mathching coefficient of balance transformers
平衡变压器阻抗匹配系数与产品性能关系研究 |
| 3. | Principally , when the winding - connection scheme is adopted to add a set of auxiliary windings on the two - phase side of a balance transformer , we can get a three - phase to four - phase transformer
原则上,在平衡变压器的两相侧采用增加一套副绕组的双重接线方案,便可得到三相变四相电力变压器。 |
| 4. | The short circuit test method in this paper applies to balanced transformers , such as y / v impedance - matching balanced transformer and yna impedance - unmatching balanced transformers
利用推导的短路试验方法对一台sf2 ? qy ? 25000 ? 110 27 . 5gy型阻抗匹配平衡牵引变压器进行短路试验，解决了工程实际问题。 |
| 5. | The transient simulation model of impedance - matched balancing transformers is established . the effect of transient model and equivalent circuit in calculation of steady short circuit current are compared
摘要建立了阻抗匹配平衡变压器的暂态仿真模型，比较了暂态模型和等值电路在计算稳态短路电流中的效果。 |
| 6. | In at power supply system some transformers with special connection mode , such as scott transformer , anti - scott transformer , balance transformer and so on , are usual used . the voltage ratio is one of important parameters of transformer
采用斯科特变压器、平衡变压器等特殊接线方式变压器作为主变压器，能有效抑制负序电流，减少有功损耗和电压损失，提高牵引机车的过负载能力。 |
| 7. | Under some conditions , short - circuit test on balanced transformers can be performed by means of 1 . 5 phase supply . it is proved to be equivalent to the short - circuit fault during their operation . the test results comply with gb1094 . 5 - 1985
建立一定的试验条件，在1 . 5相电源双臂预先短路情况下进行短路试验，使短路试验能够同时满足实际运行中发生短路时的短路电流有效值和短路电流峰值的要求，并进行试验验证。 |
| 8. | Impedance - matching balanced traction transformers ( balanced transformers in this paper for short ) are step - down transformers , they transfer symmetrical three phase voltage in primary side to perpendicular two phase voltage in secondary side . they are different from any other transformers , so their short - circuit current analysis and short - circuit test method must be taken into special account
阻抗匹配平衡牵引变压器(本文中简称平衡变压器)是一种将一次侧三相对称电压变换为二次侧二相垂直电压的降压变压器，它不同于已有的任何一种变压器，短路电流的分析计算和短路试验必须予以重新研究。 |
| 9. | The pictures of probabilistic characteristic in both sides of impendence matching balance transformers are drawn , and probabilistic density figures are also given . the simulation model of shaoshan 4 electrical tractor is raised , at the same time facing the restriction of probabilistic method , the paper raised that using monte carlo simulation absorbed harmonics currents of the model of electrical tractor and simulated the superposition of low harmonics currents . through compared with real time data , the monte carlo simulation can be confirmed , and the breakthrough point of restriction of using probabilistic method is discussed
为了有效模拟机车在运行中所产生的谐波电流，本文在matlab的平台空间中建立了韶山4型电力机车的仿真模型，导入到matlab运算程序中，对低次谐波电流叠加进行模拟，从而证实了蒙特卡罗模拟法仍然是目前较为可靠可行的方法，同时讨论了在电牵引系统中针对低次多谐波源叠加使用基于中心极限定理的概率分析方法必须使用相关参数进行修正，即需要和电力机车的带电运行方式有机的结合在一起。 |
| 10. | It ’ s very attractive to optimize the balance transformers for their charming profits , enhanced total performance , lowered power cost , and manufacture cost , therefore more and more researcher focus on it . this dissertation tries its best to develop a satisfactory optimization design method of the impedance - matching balance transformers
平衡变压器的优化设计对于降低变压器制造成本、提高整体性能、增强变压器制造厂的竞争实力以及节能降耗,建设“绿色”节约型社会都有着重大意义,因而越来越受到有关专家、学者以及工程设计人员的关注和重视。 |
