© ABB Group April 18, 2023 | Slide 1

Earthing Switch Retrofit Kit forHGC-3 & HEC 3..6ABB High Current Systems Services

GCB Service

© ABB Group April 18, 2023 | Slide 2

HGC 3 SystemEarthing Switch Retrofit Kit HGC-3 & HEC 3..6

Manufactured from 1998 – 2010 in Zurich, Switzerland

Optional earthing switch was provided on either or on both sides

Transformer side (3)

Generator side (4)

© ABB Group April 18, 2023 | Slide 3

Why Earthing Switch Retrofit Kit?Earthing Switch Retrofit Kit HGC-3 & HEC 3..6

Challenge

If earthing switch was not equipped during factory assembly, new enclosures would be necessary to supply in order to retrofit

Solution

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

© ABB Group April 18, 2023 | Slide 4

Scope of supplyEarthing Switch Retrofit Kit HGC-3 & HEC 3..6

Parts and components

Earthing switch complete

Earthing Contact

Support FVZ

Console complete

Earthing switch motor drive

Adaptations control cubical incl. mimic

Earthing switch complete

Motor Drive

Open position Close position

© ABB Group April 18, 2023 | Slide 5

Scope of supplyEarthing Switch Retrofit Kit HGC-3 & HEC 3..6

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

© ABB Group April 18, 2023 | Slide 6

Scope of supplyEarthing Switch Retrofit Kit HGC-3 & HEC 3..6

Project Based Tasks

Adjustments of existing electrical schematic

Adjustments of customer interlocking system

© ABB Group April 18, 2023 | Slide 7

Summary / Benefits

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 April 18, 2023 | Slide 8