1. Technical University of Bialystok MSc Jarosław WIATER New MOV element model with hysteresis loop in ATP/EMTP

2. 1. Introduction 2. Surge arrester with hysteresis loop 3. New model 4. Verification 5. Conclusions New MOV element model with hysteresis loop in ATP / EMTP

3. 1. Introduction o ATP/EMTP uses MOA element o Limitations of MOA o Hysteresis loop

4. New MOV element model with hysteresis loop in ATP / EMTP 2. Surge arrester with hysteresis loop 8/20  s

5. New MOV element model with hysteresis loop in ATP / EMTP 2. Surge arrester with hysteresis loop

6. New MOV element model with hysteresis loop in ATP / EMTP 2. Surge arrester with hysteresis loop

7. New MOV element model with hysteresis loop in ATP / EMTP o maximum continuous operating voltage Uc=275V orated voltageUr<1500V o nominal discharge currentIn=20kA o maximum discharge currentImax=40kA 2. Surge arrester with hysteresis loop

8. New MOV element model with hysteresis loop in ATP / EMTP 3. New model

9. New MOV element model with hysteresis loop in ATP / EMTP 4. Verification

10. New MOV element model with hysteresis loop in ATP / EMTP 5. Conclusions o precisely approximates surge arrester characteristic o real MOA V-I characteristic can be directly transferred from o digital measurement to computer simulation program o there is no need to approximate any MOA analog parameters o new model can be also use for any non-linear element with o hysteresis loop in V-I characteristic or not too o tricky algorithm eliminates oscillation during step parameter change o it’s easy to improve in future by simple ATP/EMTP user