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This paper presents a fault location algorithm for single phase to ground faults on three terminal transmission lines. The conventional fault location methods, using one-terminal ac voltage and current are not applicable to the multi-terminal systems. So, the indication of the faulted section and fault distance estimation is performed by using three-phase current and voltage of the terminal at which a fault locator is installed. The delivered fault-location algorithm consists of three subroutines designated for three types of fault. A MATLAB-SIMULINK simulator is used to demonstrate the performance of the proposed fault locator. The result of simulation verifies the high accuracy of fault location with various fault resistances and locations.