Hello!
Will someone be able to check the attached circuit and tell me why they are tripping the relay dj_via1_16 and also the recloser rl03060?
Is opendss interpreting the TCC_Curve curve incorrectly?
I am using the following features for simulation, both in opendss and opendss-g:
mode = dynamic controlmode = time stepsize = 1.0h number = 24 hour = 0 h = 1.0 sec = 0
Thanks.
I am analyzing only the occurrence of a short circuit in several buses in the distribution network and observe the voltages during pre-fault and post-fault on the PS_31634 (photovoltaic plant) bus. So I came across this problem of coordination between two protective devices, however when I increase the dj_via1_16 relay time dial to 0.15, for example, the system is coordinated, but it should also be dialed at 0.13.
So I don't see the need to load the circuit to perform a short circuit simulation.
Grateful for the attention.
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When defining the circuit using the statement "New circuit..." you are creating a voltage source which is the substation. The name of the VSource is source. Normally the users are not aware of that but that's what happens. By adding another VSource you must be careful when defining the voltage and phase angle since, phase angle shifting can drive your system to a short circuit condition, which will override your protections or just keep them triggered.
Best regards
Davis
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However, when applying the short circuit, it continues to open both protections, that is, it is not respecting the coordination time.
Tell me, did the simulation run perfectly with you, that is, did you open only the element RL03060?
Why are you opening the DJ_16 element together with the RL03060?
Grateful for the attention.
Luciano.
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As I already mentioned, I wanted to check the voltage on the busbars of the circuit during the pre-fault and post-fault, since the Transformer.UT_MGD_PV transformer (photovoltaic coupling transformer) is delta in the primary.
The intention is to insert a short circuit (three-phase, two-phase, single-phase) on all buses and observe voltages on the other buses.
However, one of the cases caught my attention. That is, when I apply a short circuit, for example, on the ps_26608 bus (fault.falta_26608_3f), where we have two protections in series Relay.DJ_VIA1_16 and Recloser.RL03060, I noticed that the simulation did not go as expected, which in my understanding only the Recloser.RL03060 recloser should open and go to the block and not the two protections in series.
That's why I reported this matter because I don't know if it's a software bug or I'm doing something wrong.
If I have not clarified very well, do not hesitate to ask questions.
Thanks.
Luciano
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I see that you are running this in Dynamics mode, but with a 1-h time step. I think what is happening is that both the Relay and the Recloser are posting delayed actions to the control queue that don't get executed until the next time step. You can check this by adding Set TraceControl = Yes before the solution is executed. This creates a CSV file Trace_ControlQueue.CSV. It may take you a little bit of effort to decipher this file, but it basically keeps track of when control actions are pushed onto the queue and when they are popped off.
You might try running at a very small time step when the simulation gets to the time when the fault is applied. The time step must be small enough to represent the trip times of both devices distinctly. I think the Relay will reset in 15 s (default) if there is not enough current to trip it after the Recloser opens. Anyway, give that a try if you haven't already.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
I confess that I was not able to interpret the information contained in the Trace_ControlQueue.CSV file very well. In the OpenDSS manual there is not much detail, is there another place that I can get more information about each action recorded in the file?
Well, in relation to my case, the problem really was in the time step. Then I changed the stepsize = 0.01 and number = 1000, the simulation occurred as expected, that is, opening only the element RL03060.
I am slowly learning more about OpenDSS features.
I appreciate the support of all of you.
Thank you.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hello!
Will someone be able to check the attached circuit and tell me why they are tripping the relay dj_via1_16 and also the recloser rl03060?
Is opendss interpreting the TCC_Curve curve incorrectly?
I am using the following features for simulation, both in opendss and opendss-g:
mode = dynamic controlmode = time stepsize = 1.0h number = 24 hour = 0 h = 1.0 sec = 0
Thanks.
Hello,
Why do you have 2 vosources at the feeder head? is that intentional?
Best regards
Davis
Hello Davis!
No! Only one source (via1-16).
The system must have created it when I converted from DSS to DSP. I hadn't realized that. Could these two sources be causing the problem?
Attach the attached file used for the conversion.
Grateful for the attention.
Also, why don't you have any load in the model? What are you trying to test here?
Best regards
Davis
Dear Davis,
I am analyzing only the occurrence of a short circuit in several buses in the distribution network and observe the voltages during pre-fault and post-fault on the PS_31634 (photovoltaic plant) bus. So I came across this problem of coordination between two protective devices, however when I increase the dj_via1_16 relay time dial to 0.15, for example, the system is coordinated, but it should also be dialed at 0.13.
So I don't see the need to load the circuit to perform a short circuit simulation.
Grateful for the attention.
Hello,
When defining the circuit using the statement "New circuit..." you are creating a voltage source which is the substation. The name of the VSource is source. Normally the users are not aware of that but that's what happens. By adding another VSource you must be careful when defining the voltage and phase angle since, phase angle shifting can drive your system to a short circuit condition, which will override your protections or just keep them triggered.
Best regards
Davis
Hello Davis!
I changed it to a single source, as described below:
New Circuit.VIA1-16 Bus1=SE_VIA1
~ basekv=23.1 Angle=90 Frequency=60 Phases=3
~ r1=(0.02922 5.29 ) x1=(0.30841 5.29 ) r0=(0.00676 5.29 ) x0=(0.07424 5.29 )
However, when applying the short circuit, it continues to open both protections, that is, it is not respecting the coordination time.
Tell me, did the simulation run perfectly with you, that is, did you open only the element RL03060?
Why are you opening the DJ_16 element together with the RL03060?
Grateful for the attention.
Luciano.
Hello,
How are you applying the SC? Could you please describe the process so I can figure it out what's going on?
Best regards
Davis
Davis,
As I already mentioned, I wanted to check the voltage on the busbars of the circuit during the pre-fault and post-fault, since the Transformer.UT_MGD_PV transformer (photovoltaic coupling transformer) is delta in the primary.
The intention is to insert a short circuit (three-phase, two-phase, single-phase) on all buses and observe voltages on the other buses.
However, one of the cases caught my attention. That is, when I apply a short circuit, for example, on the ps_26608 bus (fault.falta_26608_3f), where we have two protections in series Relay.DJ_VIA1_16 and Recloser.RL03060, I noticed that the simulation did not go as expected, which in my understanding only the Recloser.RL03060 recloser should open and go to the block and not the two protections in series.
That's why I reported this matter because I don't know if it's a software bug or I'm doing something wrong.
If I have not clarified very well, do not hesitate to ask questions.
Thanks.
Luciano
I see that you are running this in Dynamics mode, but with a 1-h time step. I think what is happening is that both the Relay and the Recloser are posting delayed actions to the control queue that don't get executed until the next time step. You can check this by adding Set TraceControl = Yes before the solution is executed. This creates a CSV file Trace_ControlQueue.CSV. It may take you a little bit of effort to decipher this file, but it basically keeps track of when control actions are pushed onto the queue and when they are popped off.
You might try running at a very small time step when the simulation gets to the time when the fault is applied. The time step must be small enough to represent the trip times of both devices distinctly. I think the Relay will reset in 15 s (default) if there is not enough current to trip it after the Recloser opens. Anyway, give that a try if you haven't already.
Hello Roger!
I confess that I was not able to interpret the information contained in the Trace_ControlQueue.CSV file very well. In the OpenDSS manual there is not much detail, is there another place that I can get more information about each action recorded in the file?
Well, in relation to my case, the problem really was in the time step. Then I changed the stepsize = 0.01 and number = 1000, the simulation occurred as expected, that is, opening only the element RL03060.
I am slowly learning more about OpenDSS features.
I appreciate the support of all of you.
Thank you.