Why we kept synchronisation breaker separately for Gas turbines

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sriram sandeep

As GCB (16 kv) is the synchronisation breaker for gas turbine what is the advantages we are getting?

Why we are not using GCB as synchronisation breaker for steam turbine instead of line breaker (400kv)?

Does the reason....this might be..

As we need auxiliary power to start the gas turbine with the help of LCI, are we keeping 16kv gcb as synchronisation breaker for Gas turbine??
 
sriram sandeep,

Some sites synchronize the gas turbine generator across a breaker that is on the high-voltage side of the main step-up transformer; in fact, many F-class turbines do this.

So, it would seem that whomever designed the plant where you work must have had a specific reason--possibly the one you listed. But, it's virtually impossible for anyone to say for certain without being able to at least view the one-line diagrams for the plant, and also without being able to talk to the plant designer.

Some newer plants have sections of the Plant Manuals (written and provided by the AE, Architect-Engineering firm) that describe the design philosophy used for the plant.
 
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