1. GCB Service
Earthing Switch Retrofit Kit for HGC-3 & HEC 3..6 ABB High Current Systems Services
© ABB Group
April 15, 2017 | Slide 1

2. HGC 3 System Earthing 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 15, 2017 | Slide 2

3. Why Earthing Switch Retrofit Kit
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 15, 2017 | Slide 3

4. Scope of supply Earthing 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
Open position
Close position
Motor Drive
© ABB Group
April 15, 2017 | Slide 4

5. Scope of supply Earthing 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 15, 2017 | Slide 5

6. Scope of supply Earthing Switch Retrofit Kit HGC-3 & HEC 3..6
Project Based Tasks
Adjustments of existing electrical schematic
Adjustments of customer interlocking system
© ABB Group
April 15, 2017 | Slide 6

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 15, 2017 | Slide 7

8. © ABB Group
April 15, 2017 | Slide 8