Innovative SF6 free switch with shunt vacuum interuption technology

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CIRED 2019 - 770.pdf (319.16 KB)

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.

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Keywords

Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

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