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With the increase of wind farm capacity in distribution network, the transient stability of electrical grid may be influenced by the dynamic behavior of wind farms in the grid fault, and may be different by variable wind turbines. In order to analysis the effect on grid caused by fix -speed wind turbine with cage generators and variable-speed turbines with doubly-fed induction generators and direct drive synchronous generators, the models of these wind turbines and wind farms consisting of these wind turbines are established in DIgSILENT/PowerFactory. It is concluded that the stability of induction machine is lower than the other tow wind turbines through the compare in transient stability and terminal voltage of three wind turbines. It is demonstrates that variable-speed turbines increases the transient stability margin of the electrical grids, when compared with fixed-speed wind turbines, and variable-speed turbines helps to avoid other problems as voltage collapse due to the reduction in dynamic reactive demand. Additionally, this paper reports an investigation to determine the impact of integrated generator on the settings of protective devices of electrical feeders emanated from the substation to which integrated wind turbines are connected.