Premset 15 kV Compact modular vacuum switchgear Fixed circuit-breakers. Understand the choice of fixed circuit-breakers and the advantages they offer to customers Regarding environmental and installation conditions. Infrastructure Business Training. Expert: Jean-Marc Biasse
Infrastructure Business Training
Expert: Jean-Marc Biasse
Coordinator: Christine Storck
Pedagogy & Production: AMEG
Duration: 7 min.
ABB: Safe Plus
Eaton: SVSOther manufacturers
Maintenance of oil circuit-breaker in the past
Test position to enable testing of the relay protection chain
Maintenance and safety procedures
Suitable for installations in electro-intensive industries
Oil & Gas, minerals, metals and paper
High fault levels due to the presence of MV motors
I > 3150 A, Icc > 40 kA
Frequency of switching
Quick replacement of CB for critical applications
High availability of field service personnel
Why are withdrawable circuit-breakers challenging the usual established industry logic?
Withdrawable CBs face specific failure risks if maintenance is not sufficient
Overheating on sliding contacts if poor alignment between fixed & moving part
Mechanical jamming of CB truck, shutters and associated interlock
Poor electrical contact in the auxiliary switch connectors
Higher reliability of fixed CBs
High quality of bolted contacts, less sensitive to environment
High reliability of vacuum interrupters
Testbox device for periodic maintenance operations without CB removal
Which unnecessary features taken for granted by the industry should be eliminated?
Which features should be reduced below the industry standard?
Which new values should be created that the industry has never offered?
Which features should be raised well above the industry standard ?
Withdrawability, O-0,3s-CO, Switch-
fuse for MV/LV transformer protection
Footprint, Corrective maintenance
Harsh environment withstand, operator
safety through internal arc withstand,
switchgear life expectancy
100 A – 200 A optimized CBs for MV/LV transformer protection, dedicated cable testing devices, screened CTs and VTs
Benefits for customersReinforced continuityof service
Modern fixed circuit-breakers with vacuuminterrupters require very low maintenance service.
No more need to clean or lubricate contacts.
The circuit-breaker is bolted on, avoiding exposure to air of sliding contacts.
No more moving mechanisms (disconnecting contacts, shutters, truck), a potential cause of failure.Low maintenance
A real reduction of
Low maintenance cost
Testing as easy as with withdrawable devices
Testing is done on the front panel, without any dismantling
Mimic diagrams facilitate testing and display circuit-breaker status
In some cases, an optional accessory may be used for primary injection without disconnecting the breaker
Earthing switch operation
testing by secondary injection
Premset mimic diagram
Normal conditions class
clean and dry trench,
absence of dust,
no vegetation around,
not in a coastal area, …
> Modular AIS switchgear with withdrawable CBResistance environment
> GIS & 2SIS switchgear
with fixed CB
> Modular AIS switchgear with withdrawable CB
if decent installation conditions
Fixed circuit-breakers offer many advantages for customers:
- Energy Business Training - Premset: Fixed circuit breakers – October 2012
Infrastructure Business training
Do you want to know more about Schneider Electric,
our offering and solutions?
Then take some time to visit our website
- Energy Business Training - Premset: Fixed circuit breakers - October 2012