Abstract: In debugging of the 330 MW unit of a power plant, it was found that the stay hook of the emergency governor can not reset sometimes. According to analysis, the reason of the defect mentioned above is that the moment of torsion of parallelarranged doublesupported springs installed in location near the stay hook is insufficient. The moment of torsion of the springs was increased by some means, and the problem of stay hook reset was solved.

Key words: emergency governor, reset, parallel-arranged double-support springs, moment of torsion, torsional deformation angle