 Gas Turbine Systems
Owners of gas turbine driven generators built in the 1960s and 1970s face the increasingly frustrating challenge of maintaining original equipment excitation systems that are rapidly
approaching obsolescence. Parts and services are becoming harder to find, while the costs of generation downtime continue to increase.
Basler offers prepackaged replacement voltage regulator systems and other retrofit options for
the Pratt and Whitney Single/Twin Pac, Westinghouse 191/251/501 and GE Frame 5.
Review the specifications of the
DECS-2100, DECS-400, DECS-200 and DECS-200N to choose the product that best fits your application.
Steam, Hydro or Engine-Driven Generators
As systems age, parts are more expensive and difficult to obtain, and
| Replacement of older equipment, such as this wire-wound rheostat, can reduce operating costs and
produce gains in system efficiency. |
it can be both expensive and technically challenging to find viable retrofit equipment options to maintain a voltage regulator/exciter system on older steam, hydro or engine-driven generators.
Basler offers replacement options for the systems listed above that makes it simple to upgrade
voltage regulator/exciter systems, supplied in either a NEMA 1 enclosure or engineered and factory tested panels for installation in existing cubicles.
Review the specifications of the
DECS-2100, DECS-400, DECS-200 and DECS-200N to choose the product that best fits your application.
For more information on system upgrades and retrofits, see the technical paper "Xcel Energy Northern Region
Experience with Excitation System Upgrades and Retrofits" from the EPRI Steam Turbine-Generator Workshop, August, 2005.
Rotating Exciter Systems
Increase reliability and flexibility while decreasing maintenance. See Application Note EX-RETRO for a summary of obsolete systems and the
recommended replacement. Basler Electric can provide a static exciter regulator to replace difficult to maintain rotating exciters, including the systems
listed above.
For applications that require negative field forcing, Basler offers the DECS-400, that utilizes separate independent appropriately sized bridges.
| Facilities with gas turbines requiring power system stabilizers benefit from Negative Field Forcing Voltage
Regulators. |
Basler’s newest Negative Forcing Digital Excitation System, the DECS-200N,
has been developed for machines with rotating exciters that are brush or brushless, up to 30-40 MVA.
We’ll provide you with 16 reasons to replace rotating exciters with digital static exciters, like the DECS-400 or you can explore the “tuning” advantages offered by the DECS-200N in Application Note EX-D200N1.
For background, review the technical paper, Application of Static Excitation Systems for Rotating Exciter Replacement
- It discusses the static exciter system, including the power control devices, power transformer and automatic voltage regulator.
Also, see how the Redundant DECS-200 pre-packaged retrofit solution is discussed in Application Note EX-D200P3
for use on small to medium size synchronous machines having either brush or brushless type rotating exciters. The
Redundant DECS-200 offers the advantage of two digital controllers that communicate via parallel ports to maintain the generator output voltage via the field of the exciter.
For more information on system upgrades and retrofits, see the technical paper "Xcel Energy Northern Region
Experience with Excitation System Upgrades and Retrofits" from the EPRI Steam Turbine-Generator Workshop, August, 2005.
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