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Constant Param, 3-ph with Fault

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Constant Param, 3-ph with Fault

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.

A transposed or untransposed CP line is represented by a) its sequences, or b) its propagation modes and the transformation matrix (Ti) between mode currents and phase currents. Implementation details can be found in [1].

This model can be used to simulate an internal fault. However, the number of operations allowed in this model is four (4) per fault element, instead of ten (10) in normal cases.



Table of Contents



Mask and Parameters

General 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 (Xl) and capacitive susceptance (1/Xc)

Line Length

The length of the line

km

length = {0, 1e64}

Distance of fault from (+) side

Distance of fault from (+) side 

km

fault_loc = {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 frequency

Base value for PU conversion

Hz

fBase = { [1, 1e64] }

Fault resistance

Fault resistance value per phase

Ω

RDef = {0, 1e64}

Ropen

Open resistance value per phase

Ω

ROpen = {0, 1e64}

Rclose

Closed resistance value per phase

Ω

RClose = {0, 1e64}

Chopping current

Current threshold for the opening permission operation

A

Imargin = {0, 1e64}

Line Data Parameters

Name

Description

Unit

Variable = {Possible Values}