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Investigation of Excessive Generator Air Gap Variations at the Rocky Reach Hydroelectric Project

机译：洛矶河水电站项目发电机间隙过大的研究

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The Rocky Reach Hydroelectric Project is located just outside of Wenatchee, Washington, onrnthe Columbia River. Owned and operated by Chelan County PUD, this project has eleven units,rnthe first of which was installed in the 1960s. Rehabilitation of the generators for units C1rnthrough C7 was not undertaken as part of an earlier turbine rehabilitation project, as they werernthought to be in acceptable condition. However, a rotating strike between the stator and rotorrnon one of the units in December 1999 shattered that assessment, and ultimately led to therndecision to completely rehabilitate these generators.rnThe rehabilitation of the generators included complete new stators and rotors, with modificationsrnto the existing upper bracket, embedded generator soleplates and other smaller items asrnrequired to install the new generators. Among many other requirements, acceptable variationsrnin the air gap of the generator were specified in order to minimize the possibility that anotherrnrotor-stator contact event would occur. Using air gap monitoring equipment installed during thernrehabilitation, the PUD discovered that the new generators were experiencing air gap variationsrnduring normal operation that were up to 37% of the nominal air gap, which was well outside ofrnthe specified value (20%).rnAfter several different attempts to correct the problem, it was determined that the root cause ofrnthe problem was not as expected. This caused a shift in thinking and resulted in taking arndifferent approach to addressing the excessive air gap variation. It also highlighted that somernassumptions need to be reassessed, particularly with regard to seasonal concrete movementrndue to changing water temperature.
机译：落基河水电项目位于哥伦比亚河沿岸的华盛顿韦纳奇外。该项目由车兰县PUD拥有并运营，共有11个单元，其中第一个单元于1960年代安装。 C1rn至C7机组的发电机修复并未作为早期涡轮机改造项目的一部分进行，因为它们被认为处于可接受的状态。然而，1999年12月，其中一个机组的定子和转子之间发生旋转罢工，使评估失败了，并最终导致决定彻底修复这些发电机.rn发电机的修复包括全新的定子和转子，并对现有的上支架进行了修改，嵌入式发电机底板和安装新发电机所需的其他较小物品。在许多其他要求中，规定了发电机气隙的可接受变化，以最大程度地减少发生另一种转子-定子接触事件的可能性。通过在修复过程中安装的气隙监测设备，PUD发现新发电机在正常运行期间遇到的气隙变化高达标称气隙的37％，远远超出了规定值（20％）。尝试解决问题，已确定问题的根本原因与预期的不符。这引起了思想上的转变，并导致采取了不同的方法来解决过度的气隙变化。它还强调，需要重新评估一些假设，特别是由于水温变化而引起的季节性混凝土运动。

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