Fast Commutation of DC Current into a Capacitor Using Moving Contacts

Dragan Jovcic (Corresponding Author)

Research output: Contribution to journalArticle

Abstract

The article describes a method of fast commutation of DC current into a capacitor. Theoretical study is provided which enables evaluation of commutating DC current for the given contact velocity, capacitance and dielectric strength. It is concluded that a non-zero contact velocity at separation is required, and a corresponding switch design is proposed.

Experimental results on a laboratory set up illustrate successful DC current commutation up to 400 A, with voltages rising to 1.3 kV. Further experiments demonstrate that parasitic parameters reduce the magnitude of the current that can be commutated.

A detailed non-linear PSCAD model and a linear model for the parasitic circuit are presented to enable prediction of the success of commutation. The model accuracy is confirmed with experimental tests.

The DC current commutation in the proposed method occurs 5-10 µs after the contact separation, which is much faster than with other methods employing moving contacts. A further benefit of the extremely short arcing is elimination of thermal issues on contacts, and possible simplified design of the mechanical switch.
Original languageEnglish
Number of pages8
JournalIEEE Transactions on Power Delivery
Early online date4 Jun 2019
DOIs
Publication statusE-pub ahead of print - 4 Jun 2019

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Electric commutation
Capacitors
Switches
Capacitance
Networks (circuits)
Electric potential
Experiments

Keywords

  • DC switchgear
  • HVDC protection
  • DC circuit breakers

Cite this

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title = "Fast Commutation of DC Current into a Capacitor Using Moving Contacts",
abstract = "The article describes a method of fast commutation of DC current into a capacitor. Theoretical study is provided which enables evaluation of commutating DC current for the given contact velocity, capacitance and dielectric strength. It is concluded that a non-zero contact velocity at separation is required, and a corresponding switch design is proposed.Experimental results on a laboratory set up illustrate successful DC current commutation up to 400 A, with voltages rising to 1.3 kV. Further experiments demonstrate that parasitic parameters reduce the magnitude of the current that can be commutated. A detailed non-linear PSCAD model and a linear model for the parasitic circuit are presented to enable prediction of the success of commutation. The model accuracy is confirmed with experimental tests.The DC current commutation in the proposed method occurs 5-10 µs after the contact separation, which is much faster than with other methods employing moving contacts. A further benefit of the extremely short arcing is elimination of thermal issues on contacts, and possible simplified design of the mechanical switch.",
keywords = "DC switchgear, HVDC protection, DC circuit breakers",
author = "Dragan Jovcic",
note = "The author is thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studies.",
year = "2019",
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T1 - Fast Commutation of DC Current into a Capacitor Using Moving Contacts

AU - Jovcic, Dragan

N1 - The author is thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studies.

PY - 2019/6/4

Y1 - 2019/6/4

N2 - The article describes a method of fast commutation of DC current into a capacitor. Theoretical study is provided which enables evaluation of commutating DC current for the given contact velocity, capacitance and dielectric strength. It is concluded that a non-zero contact velocity at separation is required, and a corresponding switch design is proposed.Experimental results on a laboratory set up illustrate successful DC current commutation up to 400 A, with voltages rising to 1.3 kV. Further experiments demonstrate that parasitic parameters reduce the magnitude of the current that can be commutated. A detailed non-linear PSCAD model and a linear model for the parasitic circuit are presented to enable prediction of the success of commutation. The model accuracy is confirmed with experimental tests.The DC current commutation in the proposed method occurs 5-10 µs after the contact separation, which is much faster than with other methods employing moving contacts. A further benefit of the extremely short arcing is elimination of thermal issues on contacts, and possible simplified design of the mechanical switch.

AB - The article describes a method of fast commutation of DC current into a capacitor. Theoretical study is provided which enables evaluation of commutating DC current for the given contact velocity, capacitance and dielectric strength. It is concluded that a non-zero contact velocity at separation is required, and a corresponding switch design is proposed.Experimental results on a laboratory set up illustrate successful DC current commutation up to 400 A, with voltages rising to 1.3 kV. Further experiments demonstrate that parasitic parameters reduce the magnitude of the current that can be commutated. A detailed non-linear PSCAD model and a linear model for the parasitic circuit are presented to enable prediction of the success of commutation. The model accuracy is confirmed with experimental tests.The DC current commutation in the proposed method occurs 5-10 µs after the contact separation, which is much faster than with other methods employing moving contacts. A further benefit of the extremely short arcing is elimination of thermal issues on contacts, and possible simplified design of the mechanical switch.

KW - DC switchgear

KW - HVDC protection

KW - DC circuit breakers

UR - https://ieeexplore.ieee.org/document/8730529/

UR - http://www.mendeley.com/research/fast-commutation-dc-current-capacitor-using-moving-contacts

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