This paper mainly studies the pre-set operation and safety measures to implement control methods for various intelligent devices with malfunctions and abnormalities or to be repaired. Under the background of 330 kV Nanshuo transforming engineering program, the paper carries out pertinent research around Shuofa Line I line, The paper works out content and operation sequence of reasonable secondary safety measures according to operation principles and precautions, and forms corresponding management and control design ideas based on the method of checking the safety measures, and establishes a set of standard safety isolation operation norms and working norms. This is the case. The secondary safety measures and control scheme proposed in this paper can greatly shorten the maintenance process of intelligent station, greatly reduce the mis-operation of the maintenance process, and greatly improve the reliability of power supply.