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The purpose of the pseudomonitor is to monitor medium voltage networks based on measurements and load profiles. The monitoring consists of calculating the voltage and power management in a network during a period.

 

 

INPUT

 

The pseudomonitor uses the following input:

•a Vision network of a medium-voltage grid with transformer loads as distribution stations

•a number of Excel files or text files per file pertaining to one or more output fields in the substation, consisting of a number of times with a measurement of power or current.

•possibly a number of Excel files or text files with external profiles.

 

Measurements

A standard measurements Excel file contains flow or power measurements from one field for a number of times.

The first row contains the header. For current measurements this is: A1: Date; B1: Time; C1: Current. This may also be: A1: Date time; C1: Current.

For power measurements this is: A1: Date; B1: Time; C1: P. This may also be: A1: Date time; C1: P. The reactive power may be added to it: D1: Q. The power values ​​are in kW and kvar.

Company-specific measurement files can be supported on request.

 

Network file

The network file contains profiles. Elements are assigned a time-related profile in the input form.

The tax value of an element is chosen so that it, multiplied by the profile factors, gives a good estimate of the current loads.

A measuring field is applied in the outgoing fields. The name of a measurement field must match the start of a measurement file name. Possibly this combination is company-specific.

 

 

CALCULATE

 

Start the calculation as follows:

•Choose Calculate | Pseudomonitor | Phase 1

•Select the measurement files to be processed. Use <Ctrl> and/or <Shift> to select more files. Choose Excel or text files under File Type.

 

During the calculation, the elements are set at their expected load value for each time (measurement) to be calculated, using the profiles. A load flow is then performed. The calculated apparent power in the outgoing field is compared with the measured power. All elements with a profile unequal to 'default' in that field are corrected. A load flow is then performed. The calculated power now corresponds to the measured power within one percent. All flows and voltages in the network are now known.

 

 

RESULTS

 

After the calculation, the following results are available for each calculated time:

•low voltage of all transformer loads

•load of all transformer loads

•loss of all transformer loads

•load of all cables

•loss of all cables

•total power loss.

 

Five times have also been detected when an extreme value was reached:

•maximum low voltage of a transformer load

•minimum low voltage of a transformer load

•maximum load of a transformer load

•maximum load on a cable

•maximum total power.

 

The results can be viewed in different ways.

 

Schematic

In the schematic network, the stress band and / or the load band are shown for the calculated objects.

 

General

Choose Calculate | Results | Overview. A global overview of the results appears, namely the five extreme situations, the operating time or. duration of the calculated period and total energy loss during the operating time.

 

Detailed

Select a number of objects and choose Calculate | Results | Details or right-click on an object. All calculated bands are shown per object. The Details button shows all calculated times with their calculated values.

 

Graphic

Select a number of objects and choose Calculate | Results | Chart. The tapes of the selected objects are shown graphically.

Select a number of objects and choose Calculate | Results | Detail graph. The results of the selected objects are shown graphically in four graphs. The fifth graph shows the total power loss of the selected objects.

 

Network

The current networks belonging to the five extreme situations are automatically stored in network files after the calculation. These network files have the same name as the opened network file, plus the date and time. After opening such a network in Vision, switching and fault situations can be analyzed manually.

 

 

PHASE 2

 

After phase 1 the actual loads at all times are known for the elements. It is now possible to calculate a modified network configuration for the entire period. To do this, choose Calculate | Pseudomonitor | Phase 2.

The available results are equal to phase 1, except for the graph with correction factors and the storage of the networks in the five extreme situations.

 

 

PHASE 3

 

After phase 1 the actual loads at all times are known for the elements. It is now possible to calculate a modified network configuration for the entire period and/or add PV automatically to loads and transformer loads based on a percentage to be specified. To do this, choose Calculate | Pseudomonitor | Phase 3.

The available results are equal to phase 1, except for the graph with correction factors and the storage of the networks in the five extreme situations.