GCB Service
Earthing Switch Retrofit Kit for
HGC-3 & HEC 3..6
ABB High Current Systems Services
© ABB Group
February 13, 2015 | Slide 1
HGC 3 System
Earthing Switch Retrofit Kit HGC-3 & HEC 3..6
© ABB Group
February 13, 2015 | Slide 2

Manufactured from 1998 – 2010
in Zurich, Switzerland

Optional earthing switch was
provided on either or on both
sides

Transformer side (3)

Generator side (4)
Why Earthing Switch Retrofit Kit?
Earthing Switch Retrofit Kit HGC-3 & HEC 3..6

Challenge


Solution


© ABB Group
February 13, 2015 | Slide 3
If earthing switch was not
equipped during factory
assembly, new enclosures would
be necessary to supply in order
to retrofit
To provide easy earthing switch /
grounding switch retrofit solution
Objective

Increase safety during
maintenance within the PP

Simplify maintenance procedures
within the PP
HGC 3
breakers
ordered w/o
earthing
switch do not
have an
assembly jig
Scope of supply
Earthing Switch Retrofit Kit HGC-3 & HEC 3..6

© ABB Group
February 13, 2015 | Slide 4
Parts and components

Earthing switch complete

Earthing Contact

Support FVZ

Console complete

Earthing switch motor drive

Adaptations control cubical incl. mimic
Earthing switch complete
Open position
Motor Drive
Close position
Scope of supply
Earthing Switch Retrofit Kit HGC-3 & HEC 3..6

© ABB Group
February 13, 2015 | Slide 5
Assembly Procedure

Removal disconnector and arcing
chambers

With alternative device,
adjustments on enclosure incl.
rework

Assembly of earthing switches
incl. linkage and motor drive

Reassembly of disconnector and
arcing chambers

Adjustments and setting of
earthing switch

Wiring of earthing switch to
control cubical

Retrofit of control cubical incl.
mimic

Mounting of new rating plate

Re-commissioning incl. functional
checks
Scope of supply
Earthing Switch Retrofit Kit HGC-3 & HEC 3..6

© ABB Group
February 13, 2015 | Slide 6
Project Based Tasks

Adjustments of existing electrical schematic

Adjustments of customer interlocking system
Summary / Benefits
© ABB Group
February 13, 2015 | Slide 7

Easy Retrofit Kit available for HGC 3 breakers, originally
not equipped with earthing switch

Ensures a safe maintenance process

Can be executed during overhaul of the unit
© ABB Group
February 13, 2015 | Slide 8