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PRESENTATION IN NETWORK DIAGRAM

 

Network

After performance of a load flow calculation, results are shown on the basis of a View.

The next conventions are valid:

•branch: power or current, flowing from the node into the branch,has a positive sign

•load, motor, battery or coil: power or current, consumed by the element, has a positive sign

•external grid, generator, wind turbine, PV or capacitor: power or current, supplied by the element, has a positive sign.

 

Colour indication after a load flow calculation

Nodes, branches and elements can be coloured when exceeding the limits. Limits have been defined for "normal conditions" and "extreme conditions". The "normal conditions" limits are closer to the rated values than the "extreme conditions" limits. The limits have been defined in the Options, at Calculation | Limits.  See Limits

The limits for nodes can be defined for four fixed voltage levels.

The load limits for branches, transformers and elements can be defined separately.

The corresponding colours can be defined for four levels: too high, much too high, too low, much too low and trigger. The colours can be defined in the Options, at Calculation | General.

 

 

All isolated components will be coloured in the "Island" colour, to be defined in the Options, at Editor | Drawing.

The colour of a transformer load is determined after a loadflow, based on both the load rate as well as the voltage level.

 

 

RESULTS

 

Each of the menu items at Calculate | Results will be explained below.

 

General

Calculate | Results | Overview is used to give an overview of  the calculated P and Q for each object type and the network losses. The results of the selected components are given separately here.

Then the number of objects with exceedance.

Then the ultimate stresses by voltage level and ultimate load rates by object type, without considering exceedance.

Then the maximum exceedances by voltage level and object type.

 

Details

Calculate | Results | Details is used to give detailed information on the selected nodes and branches.

If several nodes are selected, the arrows in the left lower corner can be used to show the other nodes or branches. If multiple component types are selected, the results will be grouped per component type by using different tabs in the result form.

As an alternative, the user can explore the results in the network by clicking on the neighbouring components in the results form.

 

Graph

With Calculate | Results | Graph can show voltage and current of selected nodes, branches and elements in a bar graph. The nodes, branches and elements in the graph are sorted as chosen. At the end of the bar the value of voltage of node or current of branch or element is given. The result colour of the object is the same in the diagram. If a bar of the bar chart is clicked, the object will be brought into focus in the editor.

The results can be compared with the results of a previously performed calculation, provided the results have been saved with Calculate | Results | Save results. To do this, the checkbox at Saved must be checked.

After performing a calculation in which the calculation setting profile or period was checked, Calculate | Results | Detailed graph shows the results of this calculation with profiles for all consecutive values as a time dependent graph.

 

Save results

With Calculate | Results | Save results the results can be saved for comparison with another load flow calculation with the graph function.

 

Export

Almost all calculated results can be exported to Excel. In fact, the export is a fixed format report of all objects on three sheets: nodes, branches and elements.

 

Display low voltages for transformer loads at other stages

After a load flow, the calculated low voltages at both sides of a transformer load can be viewed at Calculate | Results | Details.

 

See also:

•General

•Calculation