Brushless Excitation for Hydro Generators

Transcription

1 Brushless Excitation for Hydro Generators Modernisation & Cost of Ownership Alstom Hydro PlantLife Programme Customer Presentation Update : 15/03/2010

2 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/ P 2

3 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/ P 3

4 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/ P 4 Maintenance (Problems with patina, neutral zone)

5 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/ P 5

6 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/ P 6

7 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/ P 7

8 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/ P 8

9 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/ P 9

10 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/ P 10

11 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/ P 11

12 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/ P 12

13 Exciter for Turbogenerator Rotating rectifier bridge Additional bearing Hydro Services - Brushless exciter 15/03/ P 13

14 Poles mounted at yoke ring Yoke, pole shoe, pole body made of massive steel Hydro Services - Brushless exciter 15/03/ P 14

15 Rotor & diode bridge assembled Hydro Services - Brushless exciter 15/03/ P 15

16 Rotor of exciter assembled on generator shaft Hydro Services - Brushless exciter 15/03/ P 16

17 Diode bridge assembled separate Hydro Services - Brushless exciter 15/03/ P 17

18 Connection from diode bridge to field winding Hydro Services - Brushless exciter 15/03/ P 18

19 Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] Z Mutt / Grande Dixence SA / CH 2 30, Les Clées / Compagnie Vaudoise D'Electricite / CH , Ardon / Lizerne et Morge SA / CH , Moncherand /Compagnie Vaudoise D'Electricite/ CH 3 5,3 13, St. Leonard / Electricite de La Lienne SA / CH , Croix / Electricite de La Lienne SA / CH 2 39, Bisisthal / EW des Bezirks Schwyz / CH 2 9,15 6, Bocki / EW Gemeindewerk Erstfeld / CH 1 7,9 6, Hinterthal / EW des Bezirks Schwyz / CH 1 6,1 6, Luchsingen / Werkbetriebe Glarus / CH 1 2,4 3, Bannwil / BKW Energie AG / CH 3 9,5 4, Rüchlig / Jura Cement Fabriken / CH 3 2,05 8, Vissoie / Forces Motrices de la Gougra SA /CH Aue / Limmat Kraftwerke AG / CH 2 2, Glattalp / Elektrizitätswerk des Bezirks Schwyz / CH , Hydro Services - Brushless exciter 15/03/ P 19

20 Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] Balm / Elektrizitätswerk des Bezirks Schwyz / CH 1 10,5 6, Ladral / Elektrizitätswerk Bündner Oberland AG / CH 1 6,25 3, Safien / Kraftwerke Zervreila AG / CH Vissoie / Forces Motrices de la Gougra SA /CH Rheinau / Elektrizitätswerk Rheinau AG / CH ,3 93, Vissoie / Forces Motrices de la Gougra SA / CH Wernisberg / Elektrizitätswerk des Bezirks Schwyz , Tiefencastel - Ost / EWZ / CH Verzasca / Verzasca SA / CH 3 33, Plons / Elektrizitäts- und Wasserwerk Mels / CH 1 5,3 5, Oberalp / Elektrizitätswerk Ursern / CH 1 3,6 3, Erlenbach / BKW Energie AG / CH 2 10,6 16, Realta / KWZ / CH Pradella / EKW / CH Löbbia / EWZ / CH Hydro Services - Brushless exciter 15/03/ P 20

21 Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Nouva Biaschina / AET / CH 3 Power Tension Speed [MVA] [kv] [r.p.m] Beckenried / EW / CH 1 1,3 3, Sahli (Ruesalp) EBS / CH 1 6 6, Göschenen 1Ph-Generatoren, CKW, CH Jougnenaz, Société Electrique du Chatelard, CH 1 2,02 5, Piottino, AET, CH , Piottino, AET, CH , Trun, aurax energie ag, CH 1 0,88 0, Chancy Pougny, SIG, CH/F 2 13, , Rothenbrunnen, KW Zervreila AG, CH 3 52, , Bitsch, Electra-Massa/EOS, CH Flumenthal, Atel Hydro AG, CH 3 9,5 4, Innergsteig, BKW AG, CH , Tiefencastel-West, EWZ, CH Seebach, SBB, CH Hydro Services - Brushless exciter 15/03/ P 21

22 Reference List - Brushless Exciters Year HPP / Customer. / Country Qtty Power Tension Speed [MVA] [kv] [r.p.m] Göschenen, CKW, CH 2 53, Wernisberg, EBS, CH 1 2,35 6, La Bâtiaz, Electricité d Emosson SA, CH ,3 428, Z Mutt 3 & 4, Grande-Dixence SA, CH 2 Total 89 13, years of experience! Hydro Services - Brushless exciter 15/03/ P 22

23 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 Hydro Services - Brushless exciter 15/03/ P 23

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