The rapid and high-quality development of social economy and the increasing demand for power load put forward higher requirements for the safe and stable operation of power system and the healthy development of power grid.With the continuous promotion of smart grid and new energy

the smart substation is widely used as an important component of power system.As one of the core equipment in the process layer of smart substation

the stable operation of intelligent terminal is directly related to the safety of smart substation.According to the frequent alarm accident of GOOSE chain break occurring in the intelligent terminal of a 500 kV smart substation

through the on-site related equipment and data check

it analyzes the cause of the alarm.It carries out the on site rectification and preventive measures to provide reference for the analysis and handling of intelligent terminal GOOSE chain break accidents.