Real-time viewer aids you in viewing voltage and current phasors in real time to determine whether you have the correct phase rotation, as well as to ensure that your CT and VT ratios are correct.
The phasors allow you to see the magnitude and direction of the phase voltage and-current quanitities. If your CT/VT ratio is incorrect, the magnitude of the voltage/current will differ from expected values. The direction of the CTs are also important, however the phase can be flipped within the configuration.
The real time view also allows you to view harmonic data at the moment of qeurying.