Application of EMTP for Simulating Transient Phenomena in High-Voltage Laboratory Test Circuits

The paper presents simulations of a new test on HVDC cables involving a superimposed impulse voltage test, where the EMTP model was validated against real measurements taken in an HV laboratory. Additionally, simulations of very slow temporary overvoltage (TOV) on HVDC cable are shown, aiming to verify whether the existing impulse generator provides sufficient energy, given the challenge of prolonged test duration. Another similar simulation example illustrates a combined heat and basic impulse level (BIL) test, used to assess the energy capability of the impulse generator. Beyond its application in validating new test requirements and configurations in the HV lab, EMTP can also be used for the development of novel testing methods, such as the low-frequency signal injection method for earth-fault detection, where the simulation results were also validated with real-world measurements. - Božidar Filipović-Grčić, Iva Radecic & Bruno Jurišić (Koncar Institute, University of Zagreb)