I'm working on an OpenDSS LV test case and have encountered a confusing voltage specification between the transformer and the load definitions.
The transformer is defined as follows:
New Transformer.TR1 Buses=[SourceBus 1] Conns=[Delta Wye] kVs=[11 0.416] kVAs=[800 800] XHL=4 sub=y
This indicates that the low-voltage side of the transformer is rated at 0.416 kV (i.e., 416 V) as the line-to-line voltage. However, since the transformer’s low-voltage side is connected in a Wye configuration, the actual phase voltage is reduced accordingly—effectively coming out to be around 240 V.
On the other hand, the load definitions are as follows:
New Load.LOAD1 Phases=1 Bus1=34.1 kV=0.23 kW=1 PF=0.95 Yearly=Shape_1
New Load.LOAD2 Phases=1 Bus1=47.2 kV=0.23 kW=1 PF=0.95 Yearly=Shape_2
Here, the bus voltage for the loads is specified as 0.23 kV (230 V). If we interpret 230 V as the phase voltage, the equivalent line-to-line voltage would be approximately 400 V, which does not exactly match the transformer’s 416 V rating.
Could someone help clarify why the transformer’s low-voltage side is defined at 0.416 kV (implying roughly 240 V phase voltage) while the load bus voltage is set at 0.23 kV?
Thanks in advance for your insights!
Best regards,
Last edit: sry 2025-02-08
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Hi everyone,
I'm working on an OpenDSS LV test case and have encountered a confusing voltage specification between the transformer and the load definitions.
The transformer is defined as follows:
New Transformer.TR1 Buses=[SourceBus 1] Conns=[Delta Wye] kVs=[11 0.416] kVAs=[800 800] XHL=4 sub=y
This indicates that the low-voltage side of the transformer is rated at 0.416 kV (i.e., 416 V) as the line-to-line voltage. However, since the transformer’s low-voltage side is connected in a Wye configuration, the actual phase voltage is reduced accordingly—effectively coming out to be around 240 V.
On the other hand, the load definitions are as follows:
New Load.LOAD1 Phases=1 Bus1=34.1 kV=0.23 kW=1 PF=0.95 Yearly=Shape_1
New Load.LOAD2 Phases=1 Bus1=47.2 kV=0.23 kW=1 PF=0.95 Yearly=Shape_2
Here, the bus voltage for the loads is specified as 0.23 kV (230 V). If we interpret 230 V as the phase voltage, the equivalent line-to-line voltage would be approximately 400 V, which does not exactly match the transformer’s 416 V rating.
Could someone help clarify why the transformer’s low-voltage side is defined at 0.416 kV (implying roughly 240 V phase voltage) while the load bus voltage is set at 0.23 kV?
Thanks in advance for your insights!
Best regards,
Last edit: sry 2025-02-08