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The research object of this paper is the isolated grid which includes thermal and wind power generation units and the load of submerged arc furnace. The boundary value of the wind turbine's capacity and submerged arc furnace's power form a number of the grid's extreme conditions, and we get the simulation results on RTDS paltform under each extreme conditions. The voltage and frequency responses of the system are analyzed, so it can be concluded whether the isolated grid could operate in a security state. This paper makes a decision on the safe operation of isolated grids under the extreme condition by RTDS, so it has a good application prospects.