It is becoming most important to accurately model and analyze distribution systems. Because day per day it becoming more complex. The number of users are increasing very fast so distribution system is becoming very large. Every node in the distribution system is important because many users are connected to a single node. So it is very important to model a power distribution system with all components for analyzing all the condition and for future planning. For analyzing the distribution data the REAL TIME DIGITAL SIMULATOR is now a complete digital system. Thanks to the progress accomplished in the area of Real Time Computation. This digital simulator, called RTDS is equipped with an integrated system combining real-time and off-line software.