Low Voltage Prototype Design, Fabrication and Testing of Ultra-Fast Disconnector (UFD) for Hybrid DC CB

M. Hedayati, D. Jovcic

Research output: Contribution to conferencePaper

Abstract

Direct current Circuit Breakers (DC CB) are vital components for DC grids and the Hybrid DC CB is of high interest because of fast operating speed and low on state losses. The speed of operation of hybrid DC CB is crucially determined by the speed of Ultra-Fast Disconnector (UFD). This article presents in some detail design, fabrication and testing of a low voltage UFD at a University laboratory. The UFD is designed to operate in 2ms and separates the contacts by 3.0mm, which is adequate to withstand a voltage level of 7kV in air. The contacts of the UFD are designed to carry a rated current of 100A. The speed requirements demand a driver capable of supplying a current pulse of few kA, which is achieved using capacitive storage. The experimental measurements show that the UFD is capable of opening and closing in around 1.8ms. Higher opening speeds are possible but bounce becomes pronounced. The paper also presents a method of magnetic braking which eliminates bounce and enables application of higher forces and the opening time of 1.3ms is demonstrated. The speed of UFD open-close-open cycle is dependent on the charging time of the UFD driver circuit which is quite long because of large stored energy. It is concluded that at least two complete driver circuits are necessary.
Original languageEnglish
Number of pages7
Publication statusPublished - 30 Sep 2017
EventCIGRÉ Winnipeg 2017 Colloquium Study Committees A3, B4 & D1 - Winnipeg, Canada
Duration: 30 Sep 20176 Oct 2017

Workshop

WorkshopCIGRÉ Winnipeg 2017 Colloquium Study Committees A3, B4 & D1
CountryCanada
CityWinnipeg
Period30/09/176/10/17

Keywords

  • Direct Current Circuit Breaker (DC CB)
  • Ultra-Fast Disconnector (UFD)
  • High Voltage DC (HVDC)

Fingerprint Dive into the research topics of 'Low Voltage Prototype Design, Fabrication and Testing of Ultra-Fast Disconnector (UFD) for Hybrid DC CB'. Together they form a unique fingerprint.

  • Cite this

    Hedayati, M., & Jovcic, D. (2017). Low Voltage Prototype Design, Fabrication and Testing of Ultra-Fast Disconnector (UFD) for Hybrid DC CB. Paper presented at CIGRÉ Winnipeg 2017 Colloquium Study Committees A3, B4 & D1, Winnipeg, Canada.