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A Phasor measurement system is used for measuring of the amplitude, phase and frequency of the bus voltage in real time. Amplitude and phase of each station are then compared to calculate the differences. Differences in voltage amplitudes affect the amount of reactive power flow. The active power flow is influenced by differences in the voltage phasors. The system operators utilize amplitude, phase and frequency of the voltage to monitor the power flow and stability conditions. This paper proposes to create a Phasor Data Concentrator (PDC) for the comparison of phase angles in the power system and that can measure and record voltage, current and frequency of the system. The PDC has been the time form the Phasor Measurement Unit (PMU). The PMU synchronizes time using Global Positioning System (GPS). This guarantees that the electrical values are measured exactly at the same time and that the differences of phasor of more than two points can be compared. This paper is divided into two parts, the first part is the simulation. The model is simulated using the PSCAD / EMTDC. The other part will be the installation. The actual value of the power station, two stations with the results.