Detailed electro-dynamic model of an ultra-fast disconnector including the failure mode

Mario Zaja; Ali Asghar Razi-Kazemi; Dragan Jovcic

doi:10.1049/hve.2019.0387

Detailed electro-dynamic model of an ultra-fast disconnector including the failure mode

Mario Zaja^* (Corresponding Author), Ali Asghar Razi-Kazemi, Dragan Jovcic

^*Corresponding author for this work

University of Aberdeen

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

7 Downloads (Pure)

Abstract

Ultra-fast disconnector (UFD) is a key component of hybrid DC circuit breakers and it is also studied as the main switch in some DC grid topologies. A UFD model suitable for DC grid studies and considering both normal operation and failure mode is presented. The dynamic motion of contacts is analysed in detail and it is concluded that Thomson coil inductances including parasitic parameters play an important role and it is recommended to use finite element modelling. The arcing mode of UFD is repressed using a variable resistance in series with an ideal switch. The variable resistance is calculated analytically based on the instantaneous position of contacts and the circuit conditions. Two different arc models are recommended: for the air-insulated UFD and SF ₆ UFD, and in each case, two operating regimes should be considered: high and low currents. The UFD model is verified for both normal operation and failure mode using measurements on a 5 kV laboratory UFD and the results show very good matching. The 320 kV SF6 UFD model is evaluated using limited reported results from manufacturers.

Original language	English
Pages (from-to)	549-555
Number of pages	7
Journal	High Voltage
Volume	5
Issue number	5
Early online date	30 Mar 2020
DOIs	https://doi.org/10.1049/hve.2019.0387
Publication status	Published - 1 Oct 2020

Bibliographical note

Acknowledgements
This work was supported by the European Union’s Horizon 2020 research and innovation program under grant No. 691714.
The authors are thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studies.

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abstract = "Ultra-fast disconnector (UFD) is a key component of hybrid DC circuit breakers and it is also studied as the main switch in some DC grid topologies. A UFD model suitable for DC grid studies and considering both normal operation and failure mode is presented. The dynamic motion of contacts is analysed in detail and it is concluded that Thomson coil inductances including parasitic parameters play an important role and it is recommended to use finite element modelling. The arcing mode of UFD is repressed using a variable resistance in series with an ideal switch. The variable resistance is calculated analytically based on the instantaneous position of contacts and the circuit conditions. Two different arc models are recommended: for the air-insulated UFD and SF 6 UFD, and in each case, two operating regimes should be considered: high and low currents. The UFD model is verified for both normal operation and failure mode using measurements on a 5 kV laboratory UFD and the results show very good matching. The 320 kV SF6 UFD model is evaluated using limited reported results from manufacturers. ",

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Detailed electro-dynamic model of an ultra-fast disconnector including the failure mode

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