Experimental Evaluation of 5 kV, 2 kA, DC Circuit Breaker with Parallel Capacitor

Dragan Jovcic, Stefan Kovacevic

Research output: Contribution to journalArticlepeer-review

Abstract

This article describes design, operation and experimental testing of a mechanical DC CB (Circuit Breaker) with parallel capacitors. The topology resembles hybrid DC CB but there are possible advantages in the costs since the main semiconductor valve is replaced with capacitors, and in performance since this breaker inserts counter voltage earlier. A detailed PSCAD model is employed to support DC CB design and to analyse operating principles. A 5 kV, 2 kA hardware demonstrator with 1.5 ms disconnector opening time is developed
in the university laboratory. The test results demonstrate successful breaking of DC currents, with the measured time for insertion of capacitor voltage of around 290 µs. Further experimental analysis evaluates stresses on the key components,
optimal timing for opening of LCS (Load Commutation Switch) and the margins for successful current interruption.
Original languageEnglish
JournalIEEE Transactions on Power Delivery
Early online date23 Nov 2021
DOIs
Publication statusE-pub ahead of print - 23 Nov 2021

Keywords

  • DC swithcgear
  • HVDC protection
  • DC Circuit Breaker

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