OMICRON Magazine

Magazine | Issue 2 2019 The latest version of RelaySimTest 3.20 enables users to extend the benefits of system-based testing to transformer protection 1 . Instead of adopting the usual approach of simply testing the reference values of characteristics, internal transformer faults, inrush currents and other typical situations are all simulated in a realistic manner in order to assess the response of the transformer protection system. RelaySimTest thus ensures that transformer protection will function as required in real-world fault scenarios. Testing with RelaySimTest means that manufacturer- specific test templates can be dispensed with, as each relay or IED is treated as a “blackbox” – hence placing the emphasis on the correct response in the event of a fault. The new transformer protection testing features cover: › Internal transformer faults (winding to winding and winding to ground) › Placing residual current transformers in the star point of the transformer › Simulating inrush currents for testing the stability of the protection system › Defining relative current transformer faults for testing the stability of the differential protection › An upgraded transformer widget for improved analysis of test cases General innovations and enhancements The speed of transient simulations has been increased by a factor of 50, which means that larger topolo- gies can be realized, e. g., when detecting transient ground faults. The new LLX1 to LLX4 accessories for low-level signal generation using the CMC 430 are also being supported now. Other enhancements address the stability of the remote connection and offer improved test reports and an even more user-friendly network editor. Polish has been added to increase the number of languages supported by the RelaySimTest user interface to eight. REaLIsTIC TRaNsFORMER PROTECTION TEsTING Now RelaySimTest 3.20 also supports transformer protection testing 1 additional license required 21