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 is identical. The RL branches are also coupled.

Table of Contents

Mask and Parameters

Name	Description				Unit	Variable = {Possible Values}

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] }

Name	Description				Unit	Variable = {Possible Values}

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'}

Name	Description				Unit	Variable = {Possible Values}

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'}

This component has four 1-phase terminals. It means that only single-phase lines can be connected to its terminals:

Name	Description

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

None

None

At acquisition, the signals available by the sensors are:

Name	Description	Unit

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

The EMTP “.pun” format is not allowed with this model. However, the electrical parameters of PI lines can be calculated by using the https://opal-rt.atlassian.net/wiki/spaces/PDOCHS/pages/149979487 .