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

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

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

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

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

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

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

© ABB Group April 15, 2017 | Slide 8