1. Study Committee A3 HIGH VOLTAGE EQUIPMENT CIGRE SC AG1 meeting in Berlin, March 4, 2015 Page No. 1 Working Group Activity Report 2015 JWG A3/B5/C4.37 System conditions for and probability of Out-of-Phase Convener: Anton Janssen (Netherlands), Secretary: Anton Janssen (The Netherlands) Year of Kick-off: 2014 Number of Members: 18 (To be approved at the next SC meeting (To be approved at the next SC meeting Regular Members: 6Corresponding Members:12 Retiring Members: New Members: Proposed for approval by SC A3, B5, C4 1.Mirko Palazzo (CH), RM 2.Manie van der Staden (RSA), cM 3.Dyke Monyane (RSA), cM 4.Sean McGuinness (IRL), RM 5.Helio Pessao (BR), cM

2. Study Committee A3 HIGH VOLTAGE EQUIPMENT Technical activities & discussion items First meeting in Arnhem, October 2014: 5 members present but an inspiring meeting with main focus on system and (generator) protection behavior. Exchange of much literature, standards, instructions, tutorials, grid-codes, etc. Note: many corresponding members and many young members, but 8 utility members and 3 from university/research (6 manufacturers). Still asking for members from Canada (HQ, Hydro-One). Maybe a new member from Sweden. Special attention for large disturbances, where systems fell apart with afterwards a number of mis-synchronization events. Also for small disturbances that happen quite often, but here nomenclature still forms a problem. Further the requirements for generator protection (and the generator itself), where a balance has to be found between saving the power system and saving the power plant (is pole slip allowed for and how many?). This is a preferential subject for the SC B5 Session in 2016. CIGRE SC A3 meeting in Paris, August 26, 2014 Page No. 2 JWG A3/B5/C4.37

3. Study Committee A3 HIGH VOLTAGE EQUIPMENT WG Meeting schedule WG meeting: 1st meeting, Arnhem, the Netherlands, 6 and 7 October 2014 2 nd meeting, Dortmund, Germany, April 15 and 16, 2015 3 rd meeting to be decided. Also to be decided on a special meeting during the SC A3 & B3 Colloquium for the corresponding members from Japan First step will be to write a scoping document. CIGRE SC A3 meeting in Paris, August 26, 2014 Page No. 3 JWG A3/B5/C4.37

4. Study Committee A3 HIGH VOLTAGE EQUIPMENT Publications none CIGRE SC A3 meeting in Paris, August 26, 2014 Page No. 4 JWG A3/B5/C4.37

5. Study Committee A3 HIGH VOLTAGE EQUIPMENT Membership to be approved at the next A3, B5, C4 meetings Last NameFirst NameCompanyCountryStatus JanssenAntonLianderThe NetherlandsRM (Convenor) KubisAndreasTU DortmundGermanycM JonesKevinSouth-Western Public Service CompanyUSAcM WillièmeJean-MarcAlstomFranceRM PatelAmitGE EnergyUSAcM WeiskerJanSiemensGermanycM WangZhenhuaAEPUSAcM AprosinKonstantinProsoft-Systems Ltd.RussiaRM De VilliersFrancoEskomRSAcM KitauchiYoshihiroCRIEPIJapancM PoggiGiorgioEdFFranceRM SuganumaShinichiTEPCOJapancM YoshimotoSaoriToshibaJapancM PalazzoMirkoABBSwitzerlandRM Van StadenManieEskomRSAcM MonyaneDykeEskomRSAcM McGuinnessSeanEPRI InternationalIrelandRM PessaoHelioONSBrazilcM CIGRE SC A3 meeting in Paris, August 26, 2014 Page No. 5 JWG A3/B5/C4.37