Innovative SF6 free switch with shunt vacuum interuption technology

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Paper number
770
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Prévé, Christophe, Schneider Electric, France
Maladen, Romain, Schneider Electric, France
TRICHON, François, Schneider-Electric, France
Piccoz, Daniel, SASU Daniel PICCOZ, France
Abstract
This paper presents an innovative and compact SF6 free switch combining vacuum interrupters (VI) with a disconnector in air. To replace SF6as arc-quenching gas, some alternative fluorinated candidates were identified for medium voltage electrical equipment. While their GWP (Global Warming Potential) is low, these gases require authorization for handling in manufacturing plants and an end of life management. Indeed, the acute toxicities of these gases are high and carcinogentic, mutagenic and reprotoxic characteristics are not known.A better solution using air has been designed for air insulated switchgear (AIS) in secondary distribution with no breaking in gas.This solution uses dry air at a relative pressure of 0.4 bar for 12 kV and 1.5 bar for 24 kV switchgear in an epoxy tank. The 3-positions switch is based on vacuum breaking, air gap disconnection and earthing inside the tank. The operating mode is the same as current SF6 3-positions switch: breaking/disconnecting in one operation and earthing in a second operation. The combination of different devices and their interactions enable to design a compact solution with same dimensions as SF6 ones. As a consequence, this epoxy tank is fully interchangeable with SF6 one in Secondary AIS cubicle.The advantages of this solution are: fully environmental friendly, safety of people, absence of end of life gas recovering, easiness to operate, high expecting life, same footprint and full interchangeability with current SF6 switch.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/145
http://dx.doi.org/10.34890/290
ISSN
2032-9644
ISBN
978-2-9602415-0-1