id summary reporter owner description type status priority milestone component version resolution keywords cc 3649 Number of equations are not determined correctly Christian Kral Adrian Pop "I ran into troubles with my students simulating a short circuit test of quasi static transformer. Please consider the attached package Transformers. It includes two examples, SC1 and SC2. The only difference between the two examples is one connect statement: SC1: {{{ connect(currentSensor1.pin_p, voltageSensor1.pin_n); }}} SC2: {{{ connect(currentSensor1.pin_p, ground2.pin); }}} Those two connects shall be treated equally, since in SC1 the negative pin of the voltage sensor is also connected to ground2 (same potential). Consequently, the (number of) equations in SC1 are not determined correctly. However, the check of SC1 leads to the following message: {{{ Check of Transformer.SC1 completed successfully. Class Transformer.SC1 has 293 equation(s) and 292 variable(s). 183 of these are trivial equation(s). }}} SC1 cannot be simulated and returns an error message: {{{ [1] 10:02:20 Translation Error Internal error Circular Equalities Detected for Variables: powerSensor1.currentP.reference.gamma powerSensor1.currentN.reference.gamma ---------------------------------- currentSensor1.pin_n.reference.gamma powerSensor1.currentN.reference.gamma ---------------------------------- currentSensor1.pin_p.reference.gamma currentSensor1.pin_n.reference.gamma ---------------------------------- currentSensor1.pin_p.reference.gamma powerSensor1.voltageN.reference.gamma ---------------------------------- powerSensor1.voltageP.reference.gamma powerSensor1.voltageN.reference.gamma ---------------------------------- powerSensor1.currentP.reference.gamma powerSensor1.voltageP.reference.gamma ---------------------------------- [2] 10:02:20 Symbolic Error Too many equations, over-determined system. The model has 293 equation(s) and 292 variable(s). [3] 10:02:20 Translation Error Internal error Transformation Module PFPlusExt index Reduction Method Pantelides failed! }}} SC2 compiles with no complaints; the model check results are: {{{ Check of Transformer.SC2 completed successfully. Class Transformer.SC2 has 292 equation(s) and 292 variable(s). 182 of these are trivial equation(s). }}} This issue occurs under Windows and Linux with version OpenModelica 1.9.4~dev-675-gb524b08." defect closed high Frontend fixed