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Connecting wind power to the grid
Gas-insulated medium-voltage switchgear for wind farms
Answers for energy.
Wind power is booming –
now and in the future
Installed wind power capacity worldwide
250.0
200.0
150.0
100.0
74.1
59.0
50.0
31.2
24.3
0
2001
2002
39.3
2003
47.7
2004
2005
2006
93.9
2007
120.9
2008
159.2
Source: WWEAInstalled power in gigawatts (GW)
2009
203.5
Prognosis
2010
The international targets for reducing
greenhouse gases have led to a boom in
renewable energies, with a special focus
on wind power. Since the start of the
new millennium, the newly installed
capacity has increased by up to 30 percent per year. The European Union’s goal
is to obtain 20 percent of generated
electricity from renewable energy sources
by 2020, with the largest share coming
from wind power at almost 35 percent.
To reach this goal, new wind power
capacities with a total output of around
100 GW need to be installed in the EU
by 2020.
Market prospects are also promising in
other parts of the world. The need and
demand for wind power is constantly
growing, not just in industrialized but
also in emerging countries.
2
The ideal choice
for every application
Gas-insulated medium-voltage switchgear (GIS) are used for various applications in wind farms. Depending on
the operator’s requirements, different
configurations of medium-voltage GIS
allow the individual wind turbines to
be safely connected to the wind farm’s
own power grid.
Cables transmit the generated power
to a collector substation where another
medium-voltage GIS protects the wind
farm on the one hand and the power
transformer on the other, and therefore
ensures a safe connection of the
sustainably generated power to the
high-voltage transmission grid. Within
larger wind farms, reactive power compensation is used to minimize reactive
power flow. This system is also connected
with the wind farm via gas-insulated
medium-voltage switchgear.
Typical layout of wind farms
Double-T connection
Collector
substation
Single-T connection
Arrangement of the gas-insulated medium-voltage switchgear in wind farm applications
Ring connection
7
For the optimal operation
of your system
Gas-insulated medium-voltage switchgear for wind farm applications
Wind turbine: NXPLUS C Wind, 8DJH, SIMOSEC, NXPLUS, 8DA
Collector substation: 8DA, NXPLUS, NXPLUS C, 8DJH
Reactive power compensation: 8DA, NXPLUS, NXPLUS C, 8DJH
NXPLUS 8DASIMOSEC NXPLUS CNXPLUS C Wind 8DJH
Switchgear type Voltage
(kV)
8DA 40.5 40.0 5,000 2,500
NXPLUS 40.5 31.5 2,000 2,000
NXPLUS C Wind 36.0 25.0 1,000
NXPLUS C 24.0 25.0 2,500 2,000
SIMOSEC 24.0 20.0 1,250 1,250
8DJH 24.0 20.0 630 630
3
Short-circuit
current max. (kA)
Rated current
busbar max. (A)
Rated current
feeder max. (A)
1,000
Offshore projects
Walney, United Kingdom
Position: Wind turbines
Switchgear type: NXPLUS C Wind, fixed-mounted
circuit-breaker switchgear,
gas-insulated, single busbar
Electrical data: 36 kV, 20 kA, 630 A
Scope of supply: 51 panels
Greater Gabbard, United Kingdom
Position: Collector substation and
reactive power compensation
Switchgear type: NXPLUS, fixed-mounted
circuit-breaker switchgear,
gas-insulated, single busbar
Electrical data: 40.5 kV, 31.5 kA, 2,000 A
Scope of supply: 31 panels
Middelgrunden, Denmark
Position: Wind turbines
Switchgear type: NXPLUS, fixed-mounted circuit-
breaker switchgear, gas-insulated,
single busbar
Scheme 1
Switchgear type: 8DA10, fixed-mounted
circuit-breaker switchgear,
gas-insulated, single busbar
Electrical data: 24 kV, 40 kA, 2,500 A
Scope of supply: 6 panels
Electrical data: 36 kV, 31.5 kA, 1,600 A
Scope of supply: 59 panels
4
Scheme 1 Scheme 2 Scheme 3
Onshore projects
Lamèque, United States of America
Position: Wind turbines
Switchgear type: Simosec, fixed-mounted
circuit-breaker switchgear,
single busbar
Electrical data: 15 kV, 16 kA, 630 A
Scope of supply: 60 panels
Bisdorf, Germany
Position: Collector substation
Switchgear type: NXPLUS, fixed-mounted circuit-
breaker switchgear, gas-insulated,
single busbar
Germinon, France
Position: Wind turbines
Switchgear type: 8DJH, fixed-mounted
circuit-breaker switchgear,
gas-insulated, single busbar
Scheme 1
Electrical data: 36 kV, 31.5 kA, 1,250 A
Scope of supply: 12 panels
Electrical data: 24 kV, 20 kA, 630 A
Scope of supply: 32 panels
Scheme 1 Scheme 2 Scheme 3
5
12
4
11
10
9
8
6
19
21
23
L
J
C
H
E
B
G
F
D
14
17
24
5
A
Worldwide references
13
14
15
3
1
22
7
I
K
18
20
13
16
2
Onshore projectsOffshore projects
A
Baltic 1, DE, 2010
21 panels
B
Belwind, BE, 2010
14 panels
C
Walney, GB, 2010
51 panels
D
Lincs, GB, 2010,
26 panels
E
London Array, GB, 2010
20 panels
F
Greater Gabbard, GB, 2009
37 panels
G
Thanet, GB, 2009
30 panels
H
Offshore 1, DE, 2009
120 panels
I
Lynn and Inner Dowsing, GB, 2007
10 panels
J
Lillegrund, SE, 2006
10 panels
K
Arklow Bank, IE, 2003
47 panels
L
Middelgrunden, DK, 2000
59 panels
1
Oaxaca, MX, 2010
22 panels
2
Te Uku, NZ, 2010
6 panels
3
Lamèque, US, 2010
60 panels
4
Cernavoda, RO, 2010
28 panels
5
Puuska, FI, 2010
22 panels
6
Alto Contada, PT, 2010
18 panels
7
Töftedal, SE, 2010
60 panels
8
Mont Crosin, SZ, 2010
24 panels
9
Germinon, FR, 2010
32 panels
10
Fossa del Lupo, IT, 2010
35 panels
11
La Fatarella, ES, 2010
21 panels
12
Velika Popina, HR, 2010
13 panels
Brown Hill, AU, 2009
14 panels
Westereems, NL, 2008
6 panels
15
Amherst, CA, 2008
27 panels
16
Hallet, AU, 2007
18 panels
17
St. Karścino, PL, 2007
16 panels
18
Zhangbei, CN, 2006
99 panels
19
Fröhden, DE, 2006
13 panels
20
Parc Eolien, MA, 2006
209 panels
21
Red Tile, GB, 2006
7 panels
22
Turbowinds, CR, 2002
5 panels
23
Darlowo, PL, 2001
12 panels
24
Carno, UK, 1996
3 panels
6
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Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Power Distribution Division
Medium Voltage
Mozartstrasse 31 c
91052 Erlangen, Germany
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respective owners.
Subject to change without prior notice.
The information in this document contains
general descriptions of the technical options
available, which may not apply in all cases.
The required technical options should therefore
be specified in the contract.
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