We have a GE frame 9e at our site. We want to have a facility such that when we lose the National Grid we can close/synchronize to a dead bus. Please I will want to know what hardware or software needed to achieve this. Again can frame 9e of 100Mw unit can do this?

Thanks.
My e-mail address is [email protected]

 

adexgenerator,

Generally, it's possible for a GE-design Frame 9E heavy duty gas turbine-generator to close on to a dead bus. You need some relays to make sure the bus is dead, and an operator needs to choose to close on to a dead bus (with a button on the HMI to do that). Some units also can't start with a dead bus (start-check permissive), and, of course most Frame 9E units have electric motor starters so there needs to be a way to get voltage/current to the starting motor.

Usually, when a generator is closed on to a dead bus it has to operate in Isochronous speed control mode to maintain frequency. And this should be an automatic switch--not an operator-selectable choice (operators can, and do, forget to make the switch and then complain the turbine control system wasn't working properly to control frequency).

And, finally, when after the unit closes on to the dead bus how will it be synchronized to a grid? It is possible to have the GE turbine control system synchronize across a second breaker, but it requires switching relays, another set of PTs (Potential Transformers), and sometimes phase-shifting transformers depending on the type and number of step-up transformers between the generator and the grid being re-synchronized to.

It's not a difficult process, but it does require a lot of planning and forethought about how it will be operated and how to protect against faults.

 

Thank you CSA,

we have a Diesel engine that can run the Frame 9E to FSNL if there is no Power on the grid. If we can close to a dead bus, we can pick house load and start another GT that will be synchronized to the one that was used energise the bus.

Thanks.

 

adexgenerator,

How will you re-connect the plant to the grid? Is there a means for synchronizing the plant back to the grid when the connection becomes available?

Or, will you have to open the generator breakers, close the utility tie breaker, and then re-synchronize the units to the grid?

 

After closing to a dead bus, a feeder of 20mw will be picked and power will be sent to the National Control Center which will in turn send power to another power station that will start another station until the grid is fully restored. So we don't need to shut down or open the breaker.

>How will you re-connect the plant to the grid? Is there a
>means for synchronizing the plant back to the grid when the
>connection becomes available?