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Constant Param, 1-ph

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

  1. 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.

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