Issues using Math Operations inside Linecode

[Mohamad Ismail]

Hello community,

I'm having some trouble when using math operations in Linecode. Here's an example:

New linecode.LC01 nphases=3 basefreq=60 units = mi 
~ rmatrix = ['0.2 5.280 *' | '0.04 5.280 *'  '0.2 5.280 *' | '0.04 5.280 *' '0.04 5.280 *'    '0.2 5.280 *'] 
~ xmatrix = ['0.2 5.280 *' | '0.04 5.280 *'  '0.2 5.280 *' | '0.04 5.280 *' '0.04 5.280 *'    '0.2 5.280 *'] 

Using this linecode, I'm getting the following error:

"Error 792 Reported From OpenDSS Intrinsic Function:
TLineObj.CalcYprim

Error Description:
Matrix Inversion Eror for Line "100200"

Probable Cause:
Invalid impedance specified. Replaced with a tiny conductance.

While trying to find out where the error was, I eliminated the math operation one element at a time. So I found out that if I remove the math operation from the 3rd element of xmatrix, it works fine.

New linecode.LC01 nphases=3 basefreq=60 units = mi 
~ rmatrix = ['0.2 5.280 *' | '0.04 5.280 *'  '0.2 5.280 *' | '0.04 5.280 *' '0.04 5.280 *'    '0.2 5.280 *'] 
~ xmatrix = ['0.2 5.280 *' | '0.04 5.280 *'  0.2 | '0.04 5.280 *' '0.04 5.280 *'    '0.2 5.280 *'] 

Is there something that I'm missing? Or is it a bug?

Thank you!

Mohamad

[Roger Dugan]

I don't know what is going on. It could be a bug in the Parser module.

A workaround:

Set units=kft and omit the 5.280 multiplier. OpenDSS can take care of the units conversion during the LINE definition. The LINE length units can be miles. It will work.