Description

The constant parameter (CP) line model assumes that the line parameters R, L, and C are independent of the frequency effects caused by the skin effect on phase conductors and on the ground. The model considers L and C to be distributed (ideal line) and R to be lumped at three places (R/4 on both ends and R/2 in the middle). The shunt conductance G is taken as zero. The frequency dependence of the line parameters (represented in the FD model) is an important factor for the accurate simulation of waveform and peak values. However, the CP model is very robust, simple, and fast. It also provides a good alternative for a first approximation analysis. Implementation details can be found in [1].

Table of Contents

Mask and Parameters

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'}
EMTP (.pun) file for line parameters calculation	The location (path) of the EMTP file (pun file) containing the line parameters			File = {'path.name'}
L-C units in EMTP (.pun) file	The units from the pun file can be taken using two options			L-C units = { 0, 1}
	mH/km, uF/km {0}	Inductance (L), capacitance (C)
	Ohm/km, uS/km {1}	Inductive reactance (Xl) and capacitive susceptance (1/Xc)
R	Per unit length resistance		Ω/km	R = {'-1e64, 1e64'}
L	Per unit length inductance		H/km	L = {'-1e64, 1e64'}
C	Per unit length capacitor		F/km	C = {'-1e64, 1e64'}
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] }

Ports, Inputs, Outputs and Signals Available for Monitoring

Ports

This component supports a single-phase transmission line

Name	Description

Name	Description
net_1	Network connection of the left (+) side
net_2	Network connection of the right side

Inputs

None

Outputs

None

Sensors

At acquisition, the signals available by the sensors are:

Name	Description	Unit

Name	Description	Unit
I(1,2)_Node(1,2)	Current	A
V_Node(1,2)	Bus Voltage	V
P(1,2)_Node(1,2)	Active power on bus (1,2)	W
Q(1,2)_Node(1,2)	Reactive power on bus (1,2)	VAR

The (1,2) in the previous table indicates the name of the bus at each end of the line (1 for left (+) side and 2 for the right side)

Reference

H. W. Dommel, "Digital computer solution of electromagnetic transients in single and multiphase networks," IEEE Trans. Power App. Syst., vol. pas-88, pp. 388-99, 04/ 1969.

HYPERSIM Documentation

Constant Param, 1-ph