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<< Click to Display Table of Contents >> Error messages |
There are two main types.
1.Error message without reference to graphic.
"Calculation failed."
2.Error message when both error text and a reference to a graphical object exists.
"Overloaded cable K1 – K2 300.64 % 231.5 A 77.0 Service cable ug (700111, 9788403)".
Always first try to run a consistency control on the same network that received the error, since the problem often cannot be understood directly. Usually, this will give enough information in order to proceed with the troubleshooting, and to solve the problem.
Incorrectly specified feeding voltage 7.0 kV
Correct magnitude 10.7 kV
This output is obtained when the specified feeding voltage deviates too much compared to the transformer ratio. This assumes that a transformer exists at the feeding point. If there is no transformer, then the test is done against the system voltage of the feeding point.
The test is obtained if the given feeding voltage compared to the feeding point system voltage is either less than 75% or greater than 150%.
The load flow solution diverges when calculating the voltage in the node point XXXX
This is obtained when the calculation core mathematically cannot diverge regarding voltage in a node point
There can be many reasons for this. The problem is “below” the described node point.
Example of incorrect data that could cause this error:
•A too high load in the whole network or in a specific point. Check loads, conductor sizes, rated power of the transformer.
•Incorrect Ur% and/or Ux% / Uk% in a transformer.
•Conductor length is missing or is too short in one or several sections.
Calculation failed
Maximum iterations exceeded
Number of iterations 3
Maximum voltage error 0.001
In node point KNP-X
This is seldom obtained, but can depend of too few number of allowed iterations or a too narrow convergence criterion.
Change this in Tools > Network calculations > Result / Administration tab Parameters > Other parameters.
If the maximum number of iterations is set to a value greater than 999 a load level test is performed with the calculation, after which an output of the overloaded conductors and transformers will be presented.
See the user guide for further information.
System neutral-point is not documented, extended earth fault analysis is not possible
If the extended earth fault analysis has been checked in the tab “Advanced settings” at the start of a calculation, then an output of this error can be presented. The reason is that a system neutral point could not be identified, which is required by this function.
A mesh is created by the conductor XXXX – YYYY
Information about the network being interpreted as meshed, and that one of the sections in the loop is presented with a node point from and to and its object-ID.
It’s not necessary that it has to be a mesh in a strict sense as a mesh can arise as cause of parallel cables with joints. This problem is avoided if the calculation is done with the reduction control checked. There will not be any numerical errors caused by the meshes, but internally no fault protection devices can be controlled correctly within the meshes.
Transformer to zero-point data Stnx – Trf.kly is missing
A serious error when identifying a neutral point against a transformer winding.
The easiest solution is to re-construct the neutral point unless it’s possible to visually identify any error.
Transformer Stnx – Trf.idY has an illegal vector group
The transformer has a documented vector group that is not supported by the calculation system. It’s also possible that a faulty vector group is entered. See a separate appendix for further information.
Solution: The vector group is replaced with a standardized one.
Transformer Stnx – Trf.idY has no vector group specified
The transformer has no vector group specified. This output is obtained even if any of the previous vector group related messages have been given.
Transformer Stnx – Trf.idY Connection D-YN applied
Standard vector group D YN will be assigned the transformer when then the calculation is done.
Node point XXX is already indicated as system neutral point
Neutral point data have already been given (new data will not be considered)
Several system neutral points are found towards the same node-point. In this case the node-point is normally a busbar connected to a transformer (Internally in the calculation core the neutral point is attached to a busbar).
Node-point XXXX indicated as a neutral point reactor out in the network
Erroneous resistor- / reactor-data given. Data is ignored
There’s a local reactor compensation located in the network outside the primary substation with incorrect data.
The node-point XXXX is normally a busbar in a secondary substation connected to a transformer winding where the local compensation is found.
Regulated transformer StnX – Trf.idY locked at the upper limit
The regulation of the transformer is activated, and a set voltage is specified, either via the calculation parameters (LV) or directly at the tap changer. In order to get the desired voltage, the transformer is regulated to the upper limit value.
It will not be possible to get the desired voltage.
Regulated transformer StnX – Trf.idY locked at the lower limit
The regulation of the transformer is activated, and a set voltage is specified, either via the calculation parameters (LV) or directly at the tap changer. In order to get the desired voltage, the transformer is regulated to the lower limit value.
It will not be possible to get the desired voltage
Regulated transformer StnX – Trf.idY released
The transformer regulation is activated. A transformer that earlier during the calculation has been locked, on either its upper or lower level, has now been released, and can now continue to regulate. Either the desired voltage is achieved or a new upper or lower limit lock will be atcivated.
Three-winding transformer StnX – Trf.idY Erroneous given rated power
The rated power is incorrectly stated, and does not follow the standard convention for three-winding transformers. See separate appendix for further information on transformer management.