Problem with defining the load for an asymmetric system

[Adam Hreszczyk]

I have a problem with defining the load for an asymmetric system.
I want to understand what exactly the definition is and I'm trying to run a simple system with two loads. One is three-phase, star-connected, the other is single-phase.
But whatever I change, I get completely different current values. Please help me how to accurately describe the phases in terminals. My script looks like this, but I don't know if I defined it correctly:
I think, I can't understand how to define phase-to-neutral load and one phase line, there this load is connected. My circuit:

Edit Vsource.Source BasekV=15 pu=1 MVASC3=200 phases=3
!--------------------------------------------
New Linecode.katalog1 units=km R0=1.74 R1=0.253 X0=0.064 X1=0.12 C0=250 C1=250

!------------------(Transformer) --------------------------
New transformer.T1 phases=3 windings=2 XHL=4.13
~ wdg=1 bus=SourceBus.1.2.3 conn=delta kv=15 kVA=14000 %R=0.5
~ wdg=2 bus=TrafoWezel.1.2.3.4 conn=wye kv=0.4 kVA=14000 %R=0.5
~ buses=[SourceBus.1.2.3, TrafoWezel.1.2.3.4]

!-------------------------(Lines) ------------------------------
New Line.LINE1 Bus1=TrafoWezel.1.2.3.4 Bus2=WezelA.1.2.3.4 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE2 Bus1=WezelA.1.2.3.4 Bus2=WezelB.1.2.3.4 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE3_1F Bus1=WezelA.1.4 Bus2=WezelC.1.4 Linecode=katalog1 Length=0.5 Units=km

!------------------- (Load)-----------------------------
New Load.Obc1 Bus1=WezelB.1.2.3.4 phases=4 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye
New Load.Obc2 Bus1=WezelC.1.4 phases=1 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye

Moreover, I don't understand phases parameter. Does it define actual number of nodes, or only phase nodes?

Kind regards

[Paulo Radatz]

Hi Adam,

The kV and phases should be defined as follows:

1. 3ph element: kv=kVLL and phases=3, it can be wye or delta connection;
2. 1 element between phases: kv=kVLL and phases=1 (1 element);
3. 1 element between phase and ground or neutral. kv=kVLN = kVLL/sqrt(3) and phases = (1 element).

Hope it helps,

Paulo Radatz

[Adam Hreszczyk]

But, there is in manual:
Kv= Base voltage for load. For 2- or 3-phase loads, specified in phase-to-phase kV.
For all other loads, the actual kV across the load branch.
If wye (star) connected, then specify phase-to-neutral (L-N).
If delta or phase-to-phase connected, specify the phase-to-phase (L-L) kV.

So, as I understand, KV is LL only where the connection is delta. For wye it should be LN, no matter how many phases.

Why there is "phases=1" for two phases? For phase and ground seems logical for me.

And my biggest concern are definitions like these:
new load.MPANone bus1=MPANone.1.4 phases=1 kV=(0.4 3 sqrt /) kW=30 pf=0.95 model=1 conn=wye status=fixed

In manual, there is written, ground is 0 node in terminal, but there are 4 nodes in examples, so did I in my circuit. I still can't understand it.

[Adam Hreszczyk]

And what about this. I want to simulate Phase load at the ond of different phases.
So, I'm trying to connect each time to different node:

First node:
!--------------------------(Lines)-------------------------------
New Line.LINE1 Bus1=TrafoWezel.1.2.3 Bus2=WezelA.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE2 Bus1=WezelA.1.2.3 Bus2=WezelB.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE3_1F Bus1=WezelA.1 Bus2=WezelC.1 Linecode=katalog1 Length=0.5 Units=km1

!---------------------------(Load)-------------------------------
New Load.Obc1 Bus1=WezelB.1.2.3 phases=3 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye
New Load.Obc2 Bus1=WezelC.1 phases=1 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye

Second node:
!--------------------------(Lines)-------------------------------
New Line.LINE1 Bus1=TrafoWezel.1.2.3 Bus2=WezelA.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE2 Bus1=WezelA.1.2.3 Bus2=WezelB.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE3_1F Bus1=WezelA.2 Bus2=WezelC.2 Linecode=katalog1 Length=0.5 Units=km1

!---------------------------(Load)-------------------------------
New Load.Obc1 Bus1=WezelB.1.2.3 phases=3 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye
New Load.Obc2 Bus1=WezelC.2 phases=1 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye

Third node:
!--------------------------(Lines)-------------------------------
New Line.LINE1 Bus1=TrafoWezel.1.2.3 Bus2=WezelA.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE2 Bus1=WezelA.1.2.3 Bus2=WezelB.1.2.3 Linecode=katalog1 Length=0.5 Units=km
New Line.LINE3_1F Bus1=WezelA.3 Bus2=WezelC.3 Linecode=katalog1 Length=0.5 Units=km1

!---------------------------(Load)-------------------------------
New Load.Obc1 Bus1=WezelB.1.2.3 phases=3 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye
New Load.Obc2 Bus1=WezelC.3 phases=1 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye

And the result are similiar, so is it right definition?
But these currents looks odd.
This time I'm not trying to define the neutral, which should be defined by connection.

But there is another problem.
When I try this:

New Line.LINE3_1F Bus1=WezelA.3 Bus2=WezelC.3 Linecode=katalog1 Length=0.5 Units=km1
New Load.Obc2 Bus1=WezelC.2 phases=1 kV=0.23 kw=1 kvar=0.2 model=1 conn=wye

I receiving some current in LINE3, bot how? This line is giong from node 3 to node 3, but load is connected to 2 in Load.