The SVC can

in case of operation mode and of big disturbance of power grid

provide fast dynamic reactive power compensation to the power system so to improve voltage stability of the power system. The control logics of protection system are the key technology of SVC

its correct setting is the premise to ensure correct action of SVC in case of encountering fault. In this paper

throughout deep analysis of by node abnormity protection and temperature protection in the control tripping logics of SVC protection system

it is pointed out by real example that abnormal protection tripping logics of node and the tripping logics of temperature protection have design defects and improvement measure for such defects are given

which can provide reference to the deep study of node abnormity protection control logic and the temperature protection control logic to specific application of other substations so to assure normal operation of SVC.