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Upgrading Stators of Large Hydro Generators

机译：大型水轮发电机定子升级

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In order to remain competitive, hydro power plants aged twenty or more years should bernmodernized. The aim should be to replace original parts, assemblies, or systems withrnmodern ones in order to become more competitive. With these changes the end resultsrnshould be increments in capacity and availability and reductions in costs. All equipmentsrnand facilities in the energy chain at the power plant should be evaluated for changes. Onernof them is the electric power generator stator. It is there where the mechanical energyrnprovided by turbine shaft is transformed into electrical energy. Two are the main possiblernchanges when upgrading the generator stator. One is to replace existing coils with newrncoils having a larger copper cross section and modern insulating materials. Another is tornreplace existing core with a new core made of low loss magnetic steel. The generatorrnrotor may remain the same even if the reluctance of the generator magnetic circuitrnchanges a little after modernization. In any case, proposals of change including arnfeasibility analysis should be presented to higher management for approval. This Paperrnshows the basic information O&M engineers need to identify electric power generatorsrnwith potential for stator upgrading. This information is to be obtained from the analysisrnactual construction and basic electromagnetic and mechanical design calculations.rnParticular attention is given to the stacking of the core. It is concluded that a siterncontinuous stacking results in a better and trouble free core than one stacked in sectors atrnthe factory. The case of upgrading two stators from 180 to 211 MVA is used to illustraternthe process.
机译：为了保持竞争力，对二十岁或二十岁以上的水力发电厂进行现代化改造。目的应该是用现代零件替换原始零件，组件或系统，以提高竞争力。通过这些更改，最终结果应该是容量和可用性的增加以及成本的降低。应评估电厂能源链中的所有设备和设施的变化。它们的另一个是发电机定子。在那里，由涡轮轴提供的机械能被转换成电能。升级发电机定子时，有两个主要可能的变化。一种是用具有更大铜横截面的新型线圈和现代绝缘材料代替现有的线圈。另一个方法是用低损耗电磁钢制成的新铁芯代替现有铁芯。即使在现代化之后发电机磁路的磁阻发生少许变化，发电机转子也可以保持不变。无论如何，应将包括可行性分析在内的变更建议提交上级管理层批准。本文介绍了运维工程师确定具有潜在定子升级潜力的发电机所需的基本信息。这些信息将从分析实际结构以及基本的电磁和机械设计计算中获得。特别注意堆芯的堆叠。结论是，现场连续堆垛比在工厂部门中堆垛的堆芯更好，无故障。将两个定子从180 MVA升级到211 MVA的情况用于说明该过程。

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