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
Electrical Diagram of Brushless Excitation
Topic 3
Brushless Excitation
Topic 4
Advantages of Brushless Excitation
Topic 5
Installation / Examples / References
Hydro Services - Brushless exciter – 15/03/2010 - P 2
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
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
Pollution of generator with
carbon dust Reduction of
insulation resistance
DC Exciter
Maintenance (Problems with
patina, neutral zone)
Hydro Services - Brushless exciter – 15/03/2010 - P 4
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Agenda
Topic 1
Introduction
Topic 2
Electrical Diagram of Brushless Excitation
Topic 3
Brushless Excitation
Topic 4
Advantages of Brushless Excitation
Topic 5
Installation / Examples / References
Hydro Services - Brushless exciter – 15/03/2010 - P 5
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Exciter field winding
Three phase winding
of exciter
Rotating
• 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
Electrical diagram of Brushless Excitation
Diode bridge
Field winding
Hydro Services - Brushless exciter – 15/03/2010 - P 6
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Agenda
Topic 1
Introduction
Topic 2
Electrical Diagram of Brushless Excitation
Topic 3
Brushless Excitation
Topic 4
Advantages of Brushless Excitation
Topic 5
Installation / Examples / References
Hydro Services - Brushless exciter – 15/03/2010 - P 7
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Agenda
Topic 1
Introduction
Topic 2
Electrical Diagram of Brushless Excitation
Topic 3
Brushless Excitation
Topic 4
Advantages of Brushless Excitation
Topic 5
Installation / Examples / References
Hydro Services - Brushless exciter – 15/03/2010 - P 9
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Agenda
Topic 1
Introduction
Topic 2
Electrical Diagram of Brushless Excitation
Topic 3
Brushless Excitation
Topic 4
Advantages of Brushless Excitation
Topic 5
Installation / Examples / References
Hydro Services - Brushless exciter – 15/03/2010 - P 11
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Installation of Exciter
Example of installation on
vertical type machine
• Brushless exciter has to be
installed on existing shaft
• 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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Exciter for Turbogenerator
Rotating rectifier
bridge
Additional bearing
Hydro Services - Brushless exciter – 15/03/2010 - P 13
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Poles mounted at yoke ring
Yoke, pole shoe, pole body made
of massive steel
Hydro Services - Brushless exciter – 15/03/2010 - P 14
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Rotor & diode bridge assembled
Hydro Services - Brushless exciter – 15/03/2010 - P 15
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Rotor of exciter assembled on generator shaft
Hydro Services - Brushless exciter – 15/03/2010 - P 16
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Diode bridge assembled separate
Hydro Services - Brushless exciter – 15/03/2010 - P 17
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Connection from diode bridge to field winding
Hydro Services - Brushless exciter – 15/03/2010 - P 18
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Reference List - Brushless Exciters
Year
HPP / Customer . / Country
Qtty
Power
[MVA]
Tension
[kV]
Speed
[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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Reference List - Brushless Exciters
Year
HPP / Customer . / Country
Qtty
Power
[MVA]
Tension
[kV]
Speed
[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
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
93,75
Hydro Services - Brushless exciter – 15/03/2010 - P 20
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Reference List - Brushless Exciters
Year
HPP / Customer . / Country
Qtty
Power
[MVA]
Tension
[kV]
Speed
[r.p.m]
31
2003
Nouva Biaschina / AET / CH
3
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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Reference List - Brushless Exciters
Year
HPP / Customer . / Country
Qtty
Power
[MVA]
Tension
[kV]
Speed
[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
Total
2
89
13,6
10
1500
20 years of experience!
Hydro Services - Brushless exciter – 15/03/2010 - P 22
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
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
© ALSTOM 2009. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to
the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
www.power.alstom.com