Multibreak LC DC Circuit Breaker

Dragan Jovcic

doi:10.1109/PESGM48719.2022.9916775

Multibreak LC DC Circuit Breaker

Dragan Jovcic^* (Corresponding Author)

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

Abstract

LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-break
disconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DC
current with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers.

Original language	English
Title of host publication	Proceedings
Subtitle of host publication	2022 IEEE PES General Meeting
Publisher	IEEE Explore
Pages	1-5
Number of pages	5
ISBN (Electronic)	978-1-6654-0823-3
ISBN (Print)	978-1-6654-0824-0
DOIs	https://doi.org/10.1109/PESGM48719.2022.9916775
Publication status	Published - 2022
Event	2022 IEEE Power & Energy Society General Meeting (GM): IEEE PES - Sheraton Denver Downtown Hotel, Denver, United States Duration: 17 Jul 2022 → 21 Jul 2022 https://pes-gm.org/event-venue-accommodations/

Publication series

Name	IEEE Power & Energy Society General Meeting (PESGM)
Publisher	IEEE
ISSN (Print)	1944-9925
ISSN (Electronic)	1944-9933

Conference

Conference	2022 IEEE Power & Energy Society General Meeting (GM)
Abbreviated title	IEEE PES
Country/Territory	United States
City	Denver
Period	17/07/22 → 21/07/22
Internet address	https://pes-gm.org/event-venue-accommodations/

Bibliographical note

ACKNOWLEDGMENT
The author is thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental support.

This work was supported by the European Union’s Horizon 2020 research and innovation program under grant No. 691714, and SFC COVID 19 grant.

Keywords

DC switchgear
HVDC protection
DC Circuit Breakers

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Accepted author manuscript, 411 KBLicence: Unspecified

Cite this

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title = "Multibreak LC DC Circuit Breaker",

abstract = "LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-breakdisconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DCcurrent with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers. ",

keywords = "DC switchgear, HVDC protection, DC Circuit Breakers",

author = "Dragan Jovcic",

note = "ACKNOWLEDGMENT The author is thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental support. This work was supported by the European Union{\textquoteright}s Horizon 2020 research and innovation program under grant No. 691714, and SFC COVID 19 grant. ; 2022 IEEE Power & Energy Society General Meeting (GM) : IEEE PES, IEEE PES ; Conference date: 17-07-2022 Through 21-07-2022",

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doi = "10.1109/PESGM48719.2022.9916775",

language = "English",

isbn = "978-1-6654-0824-0",

series = "IEEE Power & Energy Society General Meeting (PESGM)",

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N1 - ACKNOWLEDGMENT The author is thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental support. This work was supported by the European Union’s Horizon 2020 research and innovation program under grant No. 691714, and SFC COVID 19 grant.

PY - 2022

Y1 - 2022

N2 - LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-breakdisconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DCcurrent with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers.

AB - LC DC Circuit breaker has previously demonstrated great potential for applications with DC grids at high or medium voltage, and this paper presents further technology improvements based on an experimental study. The increase in the arc voltage is analysed as the number of break points increases, since arc voltage critically determines magnitude of DC current that can be commutated. The paper describes the design of a 4-break contact assembly which provides total air gap of around 6 mm. It is concluded that it is feasible to build a 4-breakdisconnector with a 5 m/s gap velocity and with around 30-40 µs tolerance in the opening time of the four breaks. The experiments show that each break point increases the gap voltage and the commutating current almost proportionally to the number of break points. The measurements confirm that 4-break LC DC Circuit Breaker using 800 µF capacitor can commutate 930 A DCcurrent with around 4.2 kV recovery voltage. It is measured that the commutation occurs 290 µs after the trip signal, which also denotes the time when DC CB begins inserting increasing counter voltage, and which is faster than most commercial DC breakers.

KW - DC switchgear

KW - HVDC protection

KW - DC Circuit Breakers

U2 - 10.1109/PESGM48719.2022.9916775

DO - 10.1109/PESGM48719.2022.9916775

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SN - 978-1-6654-0824-0

T3 - IEEE Power & Energy Society General Meeting (PESGM)

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BT - Proceedings

PB - IEEE Explore

T2 - 2022 IEEE Power & Energy Society General Meeting (GM)

Y2 - 17 July 2022 through 21 July 2022

ER -

Multibreak LC DC Circuit Breaker

Abstract

Publication series

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Bibliographical note

Keywords

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Cite this