Traditionally, the main protection used in low voltage power systems, as distribution systems, is the overcurrent protection due to its simplicity and low cost. However, in these recent years the number of distributed generation connected to the system has been growing, which changes the complexity of the system and require a directional module to complement the diagnostic about the fault, providing information whether is a forward or reverse fault according to reference point. Therefore, in this master work is proposed a directional overcurrent module based on the stationary discrete wavelet transform. This tool could recreate the classic directional overcurrent protection using just current and voltage scaling coefficients (low frequency), which overcome some drawbacks by using discrete Fourier transform and, in some cases, fault detection is faster. The proposed method has been tested by using the IEEE 30 bus with distributed generator and the IEEE 230 kV systems test with distributed parameters.