共查询到19条相似文献,搜索用时 62 毫秒
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Model accuracy is the foundation for the transient behavior analysis of any power system. For a three-phase shell transformer, the most important part of the modeling is the nonlinear inductor of the core and the coupling between the inner two phases. According to the field data, a mathematical model for a three-phase shell transformer was created, and it was combined into distribution feeder model for system transient analysis. This model was tested, and the results were verified against those of [8]. The model response to the singlephase switching operation confirms that a three-phase shell transformer can be driven into saturation with a cable capacitance in series with it. According to the simulation, the overvoltage condition experienced by the local utility is due to the ferroresonance initiated by the single-phase switching operation on Phase C at the riser pole connected with the threephase shell transformer by a 182-ft long underground cable. The switching and system configuration have driven the transformer into saturation region and set a stage for ferroresonance. Models presented in this article can be useful in analyzing the occurrence of ferroresonance in other systems without disturbing them from their current state of operation. This can help utilities, facilities, and distribution companies to take preventive action. 相似文献
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《Engineering & Technology》2009,4(15):37-38
Born Lester Polfuss in 1915 in Waukesha, Wisconsin, the late Les Paul started his practice of engineering cannibalism at an early age. He was taking apart telephones and radios by seven, ultimately rebuilding them into rudimentary amplifiers for his guitar playing. 相似文献
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以ABB公司110kV SF6断路器为例,介绍了它的接口电路及其联接方法,对使用中出现的问题提出了相应的解决办法. 相似文献
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以ABB公司 1 1 0kVSF6 断路器为例 ,介绍了它的接口电路及其联接方法 ,对使用中出现的问题提出了相应的解决办法。 相似文献
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阐述二次回路在电力系统生产过程中的作用,并针对在安装调试中遇到的寄生回路造成误发信号问题,提出解决寄生回路的措施,确保电网安全运行。 相似文献
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介绍了模拟式触发电路与数字式触发电路相比存在的问题和自身的优势,针对模拟式触发电路存在的问题,提出了相应的改进措施,提高了模拟式触发电路工作的可靠性。 相似文献