High voltage products

PASS M00 72.5 kVHigh Voltage Internal Collection Gridfor Wind Farm

2The future of Wind Farms

In 2010, offshore wind farms accounted for 9.5% of the overall additional yearly power production resulting from wind energy exploitation in Europe, which derived from 20.5% of the total EU investments in the wind market. According to the European Wind Energy Association (EWEA), by 2020 nearly 40GW of cumulated capacity will be yielded by offshore wind farms.

In comparison with onshore installations, offshore wind farms have more predictable wind flows and avoid conflicts with other types of land use; however higher costs imply the necessity to pursue economies generated by increasing the power of the turbines and the dimensions of the farms on the one side and decreasing the power absorbed by the collection grid on the other.

The increases of the produced power, of the distance from shore, of the distance between wind turbines and of their number in a single wind farm have amplified the importance of reducing the power losses of the grids by changing their voltages, which are shifting from the currently typical value of 33 kV to 72 kV and above.

analysis.

EWEA forecasts predict that in the next two decades the traditional 2 MW and 3 MW turbines will nearly completely give way to turbines of 5 MW and above, operating in farms producing hundreds of MW each.

Global Offshore Wind Turbine Market Forecast by Turbine Size (MW): 2010-2025

Annual and Cumulative Installed EU Offshore Capacity (MW): 1991-2010

3The PASS modular design allows a wide range of configurations fully comprehensive of:

Circuit breaker; Disconnecting switches; Earthing switches; Current transformers; Voltage transformers; Surge arresters Protection and control systems

PASS M00

PASS M00 is the ABB line of multifunctional modules that cover voltages between 72.5 kV and 100kV and breaking currents up to 40kA.

PASS M00 is a suitable solution for HV Wind Farm collection grids due to its main advantages:

Compactness due to full gas insulation; Short installation time (no HV test is required on site); High reliability obtained through lean design; Fast repair in case of faults due to modular assembly; Remote control permitted by motor operability; Easy combination with oil insulated, gas insulated and dry

power transformers.

Reduce the number of array necessary to evacuate the energy arising from WTG;

Reduce the number of cables in parallel for each feeder; Increase the power capacity/current ampacity of a single

feeder; Reduce the losses in subsea AC internal grid array cables;

Decrease the voltage drop in the feeder/string; Decrease the short circuit value on internal grid apparatus; Avoid the construction of off-shore HV/MV platform

substation when off-shore wind farms are close to the coast; Make possible having flexible internal configuration and

reaching higher reliability.

A case study of new generation offshore Wind Farms equipped with 5 MW turbines revealed that the use of PASS M00 modules in 72kV collection grids allowed to fit a complete HV substation within a tower with the following advantages:

4PASS M00 configurations for Wind Farms

Configuration A

Configuration B

Configuration C

5The Station Service Inductive Voltage Transformer (SSIVT) combines the capabilities of a voltage transformer for voltages up to 420kV with the characteristics of a power transformer with ratings up to 125kVA; therefore it is a perfectly suitable solution for supplying the PASS M00 switchgear and other auxiliary services, with these advantages:

Example of configuration with SSIVT

Reduced dimensions; Maintenance free; Fast connection; High reliability; Wide range of available power; Possibility to include a disconnector; Resistance to stressful environmental conditions.

6PASS M00 configurations for Wind Farms

Example with separate units and SSIVT

Containers All the units including PASS M00 and SSIVT can be provided with a protective container as shown here.

7PASS M00

PASS M00Encapsulation single phase

Rated voltage kV (RF 50-60 Hz) 72.5

kV (RF 50Hz) 100

Rated breaking current kA 31.5-40

Rated frequency Hz 50/60

Rated current A (RBC 31.5 kA) 2500

A (RBC 40 kA) 3150

Rated power frequency kV 210

SSIVTRated power kVA 5-125

Contact us

For more information please contact:

ABB S.p.A. Power Products DivisionUnit Operativa Adda-HVVia dei Ceramisti, sncI-26900 LodiTel: +39 0371 452.1 Fax: +39 0371 452.222

www.abb.it

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t)Data and illustration without engagement. We reserve the right to make changes in the course of technical development.

Copyright 2012 ABB.All rights reserved.