Description
The PI line model is mainly used for short transmission lines. The equivalent circuit is shown below.
It is assumed that the capacitance on both sides are identical. The RL branches are also coupled.
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Mask and Parameters
General Parameters
Name | Description | Unit | Variable = {Possible Values} | |||
|---|---|---|---|---|---|---|
Description | Use this field to add information about the component | |||||
Description = {'string'} | ||||||
Type | The line data can be taken using Matrix or Sequence parameters | Matrix/Sequence = { 0, 1} | ||||
|---|---|---|---|---|---|---|
Matrix {0} | Untransposed line. The data is filled in the matrices | |||||
Sequence {1} | Transposed line. The data is filled in the sequences | |||||
Line Length | The length of the line | km | length = {0, 1e64} | |||
Base power (perPhase) | Base value for PU conversion | MVA per phase | ||||
pBase = { [1, 1e64] } | |||||
Base voltage (rmsLN) | Base value for PU conversion | kV rms LN | |||
|---|---|---|---|---|---|
vBase = { [1, 1e64] } | |||||
Base frequecy | Base value for PU conversion | Hz | |||
|---|---|---|---|---|---|
fBase = { [1, 1e64] } |
Matrix Parameters
Name | Description | Unit | Variable = {Possible Values} | |||
|---|---|---|---|---|---|---|
Resistance - R | Resistance matrix | Ω/km | ||||
R = {'-1e64, 1e64'} | ||||||
Inductance - L | Inductance matrix | H/km | L = {'-1e64, 1e64'} | |||
|---|---|---|---|---|---|---|
Capacitance - C | Capacitance matrix | F/km | C = {'-1e64, 1e64'} | |||
Sequence Parameters
Name | Description | Unit | Variable = {Possible Values} | |||
|---|---|---|---|---|---|---|
R | Resistance value for Zero and Positive sequences | Ω/km | ||||
Rseq = {'-1e64, 1e64'} | ||||||
L | Inductance value for Zero and Positive sequences | H/km | Lseq = {'-1e64, 1e64'} | |||
|---|---|---|---|---|---|---|
C | Capacitance value for Zero and Positive sequences | F/km | Cseq = {'-1e64, 1e64'} | |||
Ports, Inputs, Outputs, and Signals Available for Monitoring
Ports
This component has four 1-phase terminals. It means that only single-phase lines can be connected to its terminals:
Name | Description |
|---|---|
net_1_1 | Network connection of phase a of |
the left (+) |
side | |
net_1_2 | Network connection of phases a of |
the right |
side | |
net_2_1 | Network connection of phase b of |
the left (+) |
side | |
net_2_2 | Network connection of phases b of |
the right |
side |
Inputs
None
Outputs
None
Sensors
At acquisition, the signals available by the sensors are:
Name | Description | Unit |
|---|---|---|
I1a | Current flowing into port net_1_1 | A |
I2a | Current flowing out of port net_2_1 | A |
I1a | Current flowing into port net_1_2 | A |
I2b | Current flowing out of port net_2_2 | A |
Calculation of Electrical Parameters
The EMTP “.pun” format is not allowed with this model. However,
the electrical parameters of PI lines can be calculated by using the
Steps are as follows:
- Load a file into the Line Data GUI or enter the geometrical line parameters; details are found in Line Geometry.
- Select the transposition options
- Run the program
- The electrical parameters are displayed in the Line Data Report
To transfer the electrical parameters to the PI model, follow these steps: