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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.

Table of Contents

Mask and Parameters

General Parameters

NameDescriptionUnitVariable = {Possible Values}
DescriptionUse this field to add information about the component
Description = {'string'}
TypeThe 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 LengthThe length of the linekm

length = {0, 1e64}

Base power (perPhase)Base value for PU conversionMVA per phase

pBase = { [1, 1e64] }

Base voltage (rmsLN)Base value for PU conversionkV rms LN

vBase = { [1, 1e64] }

Base frequecyBase value for PU conversionHz

fBase = { [1, 1e64] }

Matrix Parameters

NameDescriptionUnitVariable = {Possible Values}
Resistance - RResistance matrixΩ/kmR = {'-1e64, 1e64'}
Inductance - LInductance matrixH/km= {'-1e64, 1e64'}
Capacitance - CCapacitance matrixF/km= {'-1e64, 1e64'}

Sequence Parameters

NameDescriptionUnitVariable = {Possible Values}
RResistance value for Zero and Positive sequencesΩ/kmRseq = {'-1e64, 1e64'}
LInductance value for Zero and Positive sequencesH/kmLseq = {'-1e64, 1e64'}
CCapacitance value for Zero and Positive sequencesF/kmCseq = {'-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_1Network connection of phase a of the left (+) side
net_1_2Network connection of phases a of the right side
net_2_1Network connection of phase b of the left (+) side
net_2_2Network 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

I1aCurrent flowing into port net_1_1A
I2aCurrent flowing out of port net_2_1A
I1aCurrent flowing into port net_1_2A
I2bCurrent flowing out of port net_2_2A

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 HyperView Line Tab module in HyperView.

Steps are as follows:

  1. Load a file into the Line Data GUI or enter the geometrical line parameters; details are found in Line Geometry.
  2. Select the transposition options
  3. Run the program
  4. The electrical parameters are displayed in the Line Data Report

To transfer the electrical parameters to the PI model, follow these steps:

  1. Go to the Line Data GUI
  2. The names of the lines in your network are at the bottom of the page
  3. To transfer electrical parameters, choose the name of the line and click Apply
  4. See the parameters in the forms of the line
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