Powersys EMTP-RV


*Appendix A.2. Matlab/Simulink and EMTP-RV FMI Interface*

**Figure A1.** The Matlab/Simulink FMI interface to EMTP-RV with the signals transferred between the softwares and block representation of the integration.

#### **Appendix B. Matlab/Simulink Simulation Log Definition**

Values from the implemented measurement nodes, for each grounding wire t-section as illustrated by Section 3 and Figure 1, are stored in a simulation-log database. The simulation-log database is organized with value identifications from the t-section measurements definitions in addition to the grounding grid formation strategy, Figure 2, and forms nodal points connection to physcial properties.


**Table A1.** Simulation-log nodal measurement overview and grounding system variable definitions.

#### **Appendix C. EMTP-RV Surge Arrester Parameterization** *V***-***I* **characteristics**

Surge arrester switching and damping interaction is according to standard by EMTP-RV model number: 865630. The surge arrester is parameterized according to the overview below. Where *kseg* is a fitting constant (-), *αarr* is a coefficient of non-linearity (-) and *Uarr* (pu) is a factor of the arrester system voltage (-).


