synchronization with one generation
synchronization with one generation
(OP)
A 13.8kV auxiliary services system consists of 5 substations (SE1, SE2, SE3, SE4, SE5) interconnected in a closed loop configuration. Each substation has loads and only SE1 has generation.
IIn normal condition the ring is closed (1-2-3-4-5-1). Assuming that the connection 4-5 was opened at 5 terminal. So, the ring had been cut in two ramifications: SE1-SE2-SE3-SE4 and SE1-SE5.
question:
How to synchronize the terminal 5 with 4 to close the ring again?
Note that there is only one source of generation and therefore the parties to be synchronized in the same spin speed, is never found.
IIn normal condition the ring is closed (1-2-3-4-5-1). Assuming that the connection 4-5 was opened at 5 terminal. So, the ring had been cut in two ramifications: SE1-SE2-SE3-SE4 and SE1-SE5.
question:
How to synchronize the terminal 5 with 4 to close the ring again?
Note that there is only one source of generation and therefore the parties to be synchronized in the same spin speed, is never found.






RE: synchronization with one generation
Beckwith Electric has some good papers about this subject and synchronizing as well.
http:/
RE: synchronization with one generation
qow to synchronize 2 3-phase sequence voltage vectors out of phase , both running at same frequency?
RE: synchronization with one generation
Regards
Marmite
RE: synchronization with one generation
A simple synch-check relay on the close circuits is all that is really needed to confirm that the angle differences aren't too large before closing. If the substations are close, so there is no risk of the phase angle difference being large, you might even be able to just close the circuit breaker.
RE: synchronization with one generation
yes, you can close CB but you keep two ramifications circuit eletrically separated although is physically closed.
distribution Currents after close will be the same as before. From operational viewpoint there will be doubts.
RE: synchronization with one generation
RE: synchronization with one generation
RE: synchronization with one generation
this is a 13.8kV close ring auxiliary system of about 1.3km , to supply a hydropower plant of 25 generator(25x80MVA).
I do not think is necessary check synchronism.
My viewpoint is that you only synchronize when voltage and phase angle are inside limit of synchronization AND there a little difference of frequency in order that phase sequence voltage are overlap and generators can be atracted or engaged.
With one generator we have a same frequency and even though limits are satisfied and you close CB , systems will not engaged for a short time after synchronization. This could be represent a worry for operation team.
RE: synchronization with one generation
this is a 13.8kV close ring auxiliary system of about 1.3km , to supply a hydropower plant of 25 generator(25x80MVA).
I do not think is necessary check synchronism.
My viewpoint is that you only synchronize when voltage and phase angle are inside limit of synchronization AND there a little difference of frequency in order that generators can be atracted or engaged.
With one generator we have a same frequency and even though limits are satisfied and you close CB , systems will not engaged for a while after synchronization. This could be represent a worry for operation team.
RE: synchronization with one generation
RE: synchronization with one generation
I understand to synchronize two generaror , voltage phasors must be overlapped. Although ring is phisically closed , there are no reorganization of distributing current bettween ramifications. This is very teoric interpretation of eletromagnetism that I am trying to understand.
RE: synchronization with one generation
RE: synchronization with one generation
I am not sure about your affirmative. There are no issues in closing the breaker. The problem is out phase keeping same frequency. I need to think to reply later.
About synchronization:
This system is grounding with high resistance , with phase-to-earth current no more the 10A.
All fault to ground will alarm. There are 1 hour to look for the fault and recomposition of system.
Do you think is necessary synchronism to close CB , in condition of this fault?
RE: synchronization with one generation
RE: synchronization with one generation
- SE1-SE4-5(open terminal at SE5) path, the phase angle at 5 will lag 30 that his source SE1.
- SE1-SE5 path the phase angle at SE5 will lag 10 that his source SE1.
assume you close CB with 30-10 = 20 between SE5 and 5 points of synchronization BEFORE closing.
This difference (20) will keep AFTER close because frequence is the same at both side.
SO you will not have rebalance of currents!
RE: synchronization with one generation
RE: synchronization with one generation
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: synchronization with one generation
You are completely right. Now I am convincent.
Lets go to 2nd problem
This system is grounding with high resistance , with phase-to-earth current no more the 10A.
All fault to ground will alarm. There are 1 hour to look for the fault and recomposition of system.
Do you think is necessary synchronism to close CB , in condition of this fault
OR
do you have any specific reference literature for me to do some avaliation?