Cableizer validation test suite 2016 Q1 RSS icon

Continuously validating Cableizer is a task we take serious. Our extensive test suite is a supportive tool to verify our calculations after modifications in the formulas or solver routine.

Posted on March 19, 2016
Categories: Validation



Cableizer is continuously and automatically validating its simulation results. All validation is collected in a comprehensive test suite, which allows us to ensure that modifications to our code do not affect the simulation results unexpectedly. Deviations between the calculated value and the previous result as well as between the calculated value and a reference value are analysed. The reference values are results from technical papers, books, data sheets of cable suppliers as well as results from competitors for the same cable construction and laying arrangement.

Explanations to results from December 2015 and before you find in previous posts.

In January, no modifications were done on the code but in February, we introduced four cables in a common duct. Furthermore, we included a method by Dr. E. Dorison to calculate the characteristic (or fictitious) diameter $D_x$ for sinusoidal load using modified Bessel functions instead of the fix parameter 212 mm used in the method from Neher McGrath. For more details, refer to the documentation for $D_x$ and the related parameters.

In March, the formulae to calculate the mutual heating combined with load factor were modified according to two books from Dr. G. Anders. For more details, refer to the documentation for $I_c$ and the related parameters.

DateNumber of testsMaximum deviationStandard deviation
December 2015151 (144)+11.85/-5.25 % (+5.42/-4.30 %)2.48 % (1.71 %)
January 2016no modifications
February 2016147 (140)+11.85/-5.25 % (+5.42/-4.30 %)2.46 % (1.69 %)
March 2016147 (140)+11.85/-8.38 % (+5.4/-8.38 %)2.55 % (1.91 %)
Results in brackets are without the additional 7 tests for three-core cables. For explanations, refer to this blog post

References:
  • Rating of Electric Power Cables – Ampacity Computations for Transmission, Distribution, and Industrial Applications, George J. Anders, McGraw-Hill Professional, 1. Edition 1997
  • Rating of Electric Power Cables in Unfavorable Thermal Environment, George J. Anders, Wiley-IEEE Press, 1. Edition 2005
  • Ampacity calculation for deeply installed cable, E. Dorison, IEEE Press, 2010

Categories