New possibilities in field testing of distributed protection systems

Due to the increasing complexity of our electrical power systems, the need for highly selective protection is increasingly being fulfilled by the use of teleprotection schemes or line differential protection. To test such protection systems properly, a distributed end-to-end test with synchronized injection is required. The first challenge for such a test is the correct calculation of the voltages and currents to inject at both (or even multiple) ends. Therefore, a simulation of the fault scenario based on the power system network, is needed which can deliver all of the required values. For the execution of an actual fault scenario (shot), a single software application which controls all test devices on both (or multiple) ends from a single PC, is much more convenient and productive than separate software applications, which have to be operated manually for synchronized injection. Controlling a remote test device is now possible using an existing Internet connection at each end of the test.