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Inspection and Treatment of GIS Hydraulic System Fault

ZHU Chun-cheng;Hydropower Plant of Tianshengqiao-1 Hydropower Development Co., Ltd.;  
In order to eliminate frequent faults in Tianshengqiao-1 hydropower plant due to aged GIS equipments, taking a service cylinder inner leakage accident of GIS hydraulic system as example, the cause of the fault was determined as the damage of secondary valve insider the cylinder through analyzing the working principle of GIS hydraulic system and gradually excluding the reasons for incapable pressure maintaining of GIS hydraulic system based on the fault phenomena. However, the wear degree of internal parts of GIS system becomes more and more serious which threats the safe operation of the hydropower plant and the switch station due to its service life and its operating times.
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