Calculations > Netcheck

The netcheck helps to assess a request for a new load or generation.

To this goal, two network load calculations are performed: one of the current situation and one in which the new element has been added. In both network load calculations the evening and afternoon situation are calculated.

The change in current or voltage is calculated per object.

The deterioration is assessed and, if necessary, objects are coloured if they exceed the limit.

Calculation

Select only the node where the load is to be applied.

Start the calculation with Calculate | Special | Netcheck.

A form appears in which you can enter the power and the application (load, PV, wind or generation).

Exit the form with OK.

First a network load calculation is done where the load is not yet added. The results are stored in memory.

Now the load, PV, windturbine or synchronous generator is added.

The second network load calculation is done.

Results

The results are per object type:

Node

•U,afternoon,before and U,afternoon,after

•U,evening,before and U,evening,after

•dU,before and dU,after

Branch

•Maximal load rate,before and maximal load rate,after

Element

•Maximal load rate,before and maximal load rate,after

The options for viewing the results are:

•in the scheme

•in Calculate | Results | Overview

•in Calculate | Results | Details

Scheme

For nodes, the two lines are the voltages for afternoon and evening situation.

For branches and elements, it is one line with the maximum load rate in any situation.

The color of the objects has a meaning after performing a calculation. The colors can be set in the Options with Calculation | General. The limits can be set in Calculation | Limits. Below, the default color is indicated between brackets.

Nodes:

•Standard (black): no details

•Too high color (red): U,after too high and higher than 1.005*U,before

•Too low color (blue): U,after too low and smaller than 0.995*U,before

•Too high color (red): dU,after too big and greater than 1.05*dU,before

•Island color (green): no voltage

Branches and elements:

•Standard (blakc): no details

•Too high color (red): load rate,after too high and load rate,after greater than 1.02*load rate,before

•Island color (green): no voltage

The factors relative to the before-values are to ignore already existing exceedances far from the node.

Calculation | Results | Overview

This screen gives an overview of all the problem objects. These are the objects that have been given the high color or low color in the scheme.

Calculation | Results | Details

The results of selected objects are shown.