Brushless Excitation for Hydro Generators Modernisation & Cost of Ownership Alstom Hydro PlantLife Programme Customer Presentation Update : 15/03/2010
Agenda Topic 1 Introduction Topic 2 Topic 3 Electrical Diagram of Brushless Excitation Brushless Excitation Topic 4 Advantages of Brushless Excitation Topic 5 Installation / Examples / References Hydro Services - Brushless exciter 15/03/2010 - P 2
Introduction Many old generators are still equipped with DC generators for supply of DC current. and slip rings for feeding the excitation current into the field winding. In a lot of cases static excitation is used even for small machines Slip rings are required for feeding the excitation current into the field winding: - Permanent replacement of brushes required - Pollution of generator with carbon dust requires more maintenance work Alstom Hydro Solution: Replacement with brushless exciter! Banish carbon dust from your generator! Hydro Services - Brushless exciter 15/03/2010 - P 3
Usual arrangement in most of old plants Area of DC-Exciter Groove formation and brush fire at the collector Wear of carbon brushes Sliprings with brushes DC Exciter Pollution of generator with carbon dust Reduction of insulation resistance Hydro Services - Brushless exciter 15/03/2010 - P 4 Maintenance (Problems with patina, neutral zone)
Agenda Topic 1 Introduction Topic 2 Topic 3 Electrical Diagram of Brushless Excitation Brushless Excitation Topic 4 Advantages of Brushless Excitation Topic 5 Installation / Examples / References Hydro Services - Brushless exciter 15/03/2010 - P 5
Electrical diagram of Brushless Excitation Field winding of exciter stator (feeded by simple voltage control system ) Multiphase winding of exciter rotor Rotating rectifier with diodes Copper conductors for connection to field winding of generator Field winding of synchronous machines Static Rotating Exciter field winding Three phase winding of exciter Diode bridge Field winding Hydro Services - Brushless exciter 15/03/2010 - P 6
Agenda Topic 1 Introduction Topic 2 Topic 3 Electrical Diagram of Brushless Excitation Brushless Excitation Topic 4 Advantages of Brushless Excitation Topic 5 Installation / Examples / References Hydro Services - Brushless exciter 15/03/2010 - P 7
Replacement with Brushless Excitation Collector, slip rings and carbon brushes no longer necessary Rotating exciter including rectifier bridge (diodes/thyristor) Hydro Services - Brushless exciter 15/03/2010 - P 8
Agenda Topic 1 Introduction Topic 2 Topic 3 Electrical Diagram of Brushless Excitation Brushless Excitation Topic 4 Advantages of Brushless Excitation Topic 5 Installation / Examples / References Hydro Services - Brushless exciter 15/03/2010 - P 9
Advantages of Brushless Excitation No wear of collector, slip rings and carbon brushes Simple excitation control system No power and de-excitation switch Reduced space for control cubicle No pollution with carbon dust Less maintenance work for cleaning of stator and rotor winding Environnementally Friendly Customer overall benefit... Less maintenance Less outage times Lower cost for consumables and spares Hydro Services - Brushless exciter 15/03/2010 - P 10
Agenda Topic 1 Introduction Topic 2 Topic 3 Electrical Diagram of Brushless Excitation Brushless Excitation Topic 4 Advantages of Brushless Excitation Topic 5 Installation / Examples / References Hydro Services - Brushless exciter 15/03/2010 - P 11
Installation of Exciter Brushless exciter has to be installed on existing shaft Example of installation on vertical type machine Possible installation in area of DC machine or slip rings In most cased no modifications on existing shaft necessary Exciter Integration in cooling system of generator or separate cooling Alstom Hydro will propose you the right solution! Hydro Services - Brushless exciter 15/03/2010 - P 12
Exciter for Turbogenerator Rotating rectifier bridge Additional bearing Hydro Services - Brushless exciter 15/03/2010 - P 13
Poles mounted at yoke ring Yoke, pole shoe, pole body made of massive steel Hydro Services - Brushless exciter 15/03/2010 - P 14
Rotor & diode bridge assembled Hydro Services - Brushless exciter 15/03/2010 - P 15
Rotor of exciter assembled on generator shaft Hydro Services - Brushless exciter 15/03/2010 - P 16
Diode bridge assembled separate Hydro Services - Brushless exciter 15/03/2010 - P 17
Connection from diode bridge to field winding Hydro Services - Brushless exciter 15/03/2010 - P 18
Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] 1 1991 Z Mutt / Grande Dixence SA / CH 2 30,9 10 1500 2 1992 Les Clées / Compagnie Vaudoise D'Electricite / CH 3 10 13,5 750 3 1995 Ardon / Lizerne et Morge SA / CH 2 29 8,5 600 4 1995 Moncherand /Compagnie Vaudoise D'Electricite/ CH 3 5,3 13,5 750 5 1995 St. Leonard / Electricite de La Lienne SA / CH 2 19 13,5 750 6 1997 Croix / Electricite de La Lienne SA / CH 2 39,6 12 600 7 1997 Bisisthal / EW des Bezirks Schwyz / CH 2 9,15 6,3 600 8 1997 Bocki / EW Gemeindewerk Erstfeld / CH 1 7,9 6,3 750 9 1997 Hinterthal / EW des Bezirks Schwyz / CH 1 6,1 6,3 750 10 1997 Luchsingen / Werkbetriebe Glarus / CH 1 2,4 3,3 1000 11 1997 Bannwil / BKW Energie AG / CH 3 9,5 4,25 107 12 1998 Rüchlig / Jura Cement Fabriken / CH 3 2,05 8,6 1000 13 1998 Vissoie / Forces Motrices de la Gougra SA /CH 1 19 9 428 14 1999 Aue / Limmat Kraftwerke AG / CH 2 2,09 8 1000 15 1999 Glattalp / Elektrizitätswerk des Bezirks Schwyz / CH 1 12 6,3 1000 Hydro Services - Brushless exciter 15/03/2010 - P 19
Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] 16 2000 Balm / Elektrizitätswerk des Bezirks Schwyz / CH 1 10,5 6,3 750 17 2000 Ladral / Elektrizitätswerk Bündner Oberland AG / CH 1 6,25 3,5 1000 18 2000 Safien / Kraftwerke Zervreila AG / CH 2 51 14 750 19 2000 Vissoie / Forces Motrices de la Gougra SA /CH 1 19 9 428 20 2001 Rheinau / Elektrizitätswerk Rheinau AG / CH 2 25 6,3 93,75 21 2001 Vissoie / Forces Motrices de la Gougra SA / CH 1 19 9 428 22 2001 Wernisberg / Elektrizitätswerk des Bezirks Schwyz 2 12 6,3 500 23 2001 Tiefencastel - Ost / EWZ / CH 2 26 11 750 24 2002 Verzasca / Verzasca SA / CH 3 33,3 10 600 25 2002 Plons / Elektrizitäts- und Wasserwerk Mels / CH 1 5,3 5,2 750 26 2002 Oberalp / Elektrizitätswerk Ursern / CH 1 3,6 3,15 750 27 2003 Erlenbach / BKW Energie AG / CH 2 10,6 16,8 1000 28 2003 Realta / KWZ / CH 2 20 10 600 29 2003 Pradella / EKW / CH 4 90 13 750 30 2003 Löbbia / EWZ / CH 1 50 11 500 Hydro Services - Brushless exciter 15/03/2010 - P 20
Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty 31 2003 Nouva Biaschina / AET / CH 3 Power Tension Speed [MVA] [kv] [r.p.m] 55 8 600 32 2003 Beckenried / EW / CH 1 1,3 3,15 1000 33 2003 Sahli (Ruesalp) EBS / CH 1 6 6,3 1000 34 2004 Göschenen 1Ph-Generatoren, CKW, CH 2 50 13 500 35 2004 Jougnenaz, Société Electrique du Chatelard, CH 1 2,02 5,5 750 36 2004 Piottino, AET, CH 2 23 8,2 630 37 2004 Piottino, AET, CH 1 30 8,2 750 38 2004 Trun, aurax energie ag, CH 1 0,88 0,4 1000 39 2004 Chancy Pougny, SIG, CH/F 2 13,67 11 88,2 40 2005 Rothenbrunnen, KW Zervreila AG, CH 3 52,5 14 428,5 41 2005 Bitsch, Electra-Massa/EOS, CH 2 120 12 375 42 2005 Flumenthal, Atel Hydro AG, CH 3 9,5 4,25 107 43 2005 Innergsteig, BKW AG, CH 1 22 16,8 750 44 2006 Tiefencastel-West, EWZ, CH 2 15 11 1000 45 2006 Seebach, SBB, CH 2 80 12 500 Hydro Services - Brushless exciter 15/03/2010 - P 21
Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] 46 2006 Göschenen, CKW, CH 2 53,3 10 500 47 2006 Wernisberg, EBS, CH 1 2,35 6,3 1000 48 2007 La Bâtiaz, Electricité d Emosson SA, CH 2 105 10,3 428,6 49 2007 Z Mutt 3 & 4, Grande-Dixence SA, CH 2 Total 89 13,6 10 1500 20 years of experience! Hydro Services - Brushless exciter 15/03/2010 - P 22
HYDRO SERVICES A commitment for us Your partner for excellence For more information, please contact : hydroservice@power.alstom.com Visit our Hydro Services web pages at www.power.alstom.com/hydro Hydro Services - Brushless exciter 15/03/2010 - P 23
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