Hi dear sir ...
I have a problem in my perkins 750 kva generator set. Voltage,frequency,rpm,temperature,pressures are all good but when close command from DSE controller to ABB breaker then breaker not closing. And the fault is in screen 'BUS NOT LIVE '.
Please help

 

Hi dear sir ...
I have a problem in my perkins 750 kva generator set. Voltage,frequency,rpm,temperature,pressures are all good but when close command from DSE controller to ABB breaker then breaker not closing. And the fault is in screen 'BUS NOT LIVE '.
Please help

Hi sir

Are you saying that you got synchronisation problem with this unit ?

 

When synchronizing a unit with an energized grid or electrical system the synchronization equipment looks at both the generator voltage/frequency (typically called the "incoming" voltage/frequency) and the grid/electrical system voltage/frequency (typically called the "bus" voltage/frequency, or the "running" voltage frequency). It uses two sets of potential transformers (very accurate transformers) and compares the signals from the two to check voltage and frequency and permit synchronization at the proper instant to prevent serious damage to the electrical systems and possible the generator and its prime mover and/or the coupling between the prime mover and the generator.

The error message you reported ("BUS NOT LIVE") indicates the synchronization system is not receiving any signal from the grid/electrical system (the "bus").

It is not unusual for a generator and its prime mover to be used to provide power to an un-energized grid/electrical system (or load(s))--also called a "dead bus." The act of connecting the generator output to a dead bus (an un-energized system/load) is typically called "dead bus breaker closure" and it usually requires some sort of manual selection or some sort of automatic permissive to allow the generator breaker to be closed onto a "dead" bus. You haven't told us if you are trying to close the generator breaker onto a "live" bus (an energized grid or electrical system) or a "dead" bus (an un-energized grid/system/load(s)).

So this is all the help/assistance we can provide without understanding more about the process and the circumstances of generator breaker closure. We would also really need to see what's called a Single-Line Diagram (SLD) to understand the possibilities of breaker closure (live and/or dead bus). It would help, also, if we could see the generator breaker closure circuit drawing/schematic. But, closing a generator breaker (synchronization) can be a dangerous and sometimes complicated endeavor and that's why there are relays and systems (DSE) to prevent serious damage from occurring. And, you need to tell us, or anyone you are asking for help with this problem, if you are attempting to close the generator breaker onto a live or dead bus so they can provide more assistance.

I suggest you get someone to site with knowledge of generator synchronization (to live and dead buses) to help with this problem.