A comprehensive software is needed, to test different types of protection relay's fast and reliable. The Sourcetronic relaytester work with a software which is able to manage the daily test work in a professional way. There are 3 different software packages available. The Basic package contains modules to conduct standard tests with common used relays like Quicktest, Ramp, State sequencer and many more. The Protection contains of the basic package and modules to test distance, differential and more special relays. The third package is the Advanced package, in which the basic and protection package is included, in addition to a R/X sweep, an advanced differential and a synchronizer module. A detailed list of all available modules can be downloaded from the procuct page. The software runs on Windows 98/XP/2000/ Vista and Windows 7.