关键词: 运行水头, 高低水头段, 双套, 纯机械过速保护装置, 锦屏一级水电站

Abstract:

The application of purely mechanical hydraulic overspeed protector manufactured by TURAB in Jinping Hydropower Plant is introduced. As the variation of the operating head reaches up to 87 meters, the original single device is not able to protect the unit at all operating head by correct activation. If the setting value is tuned to the high head, the low runaway speed could not trigger the protection action at low operating head. On the other hand, if the setting value is tuned to the low head, the unit maximum speed after load shedding would trigger false protection at the high head. To solve the above problems, the double devices of purely mechanical hydraulic overspeed protector and electronically controlled hydraulic switch valve applied to different ranges of high and low operating head are described in details, and the feasibility of the solution is verified in the hope of providing reference for similar engineering design and modification.

Key words: operating head, high and low operating head, double devices, purely mechanical hydraulic overspeed protector, Jinping Hydropower Station I