Associate Loads with a PDB in Batch Mode - Intergraph Smart Electrical - Help - Hexagon

This procedure explains how to associate a number of loads with a selected power distribution board. The software makes the associations and then sums up the electrical consumption and the full load current that the associated loads require. This calculation facilitates the power distribution board design at an early planning stage. Note that you can choose one of the following calculation modes:

• Calculate the total consumed power only for those loads that are connected directly to the current bus.

• Calculate the total consumed power for all the loads fed by the current bus as well as the loads that are fed by the buses that are connected to the current bus (as specified in Options Manager).

1. In the Electrical Index, expand the Electrical Equipment folder hierarchy and navigate to the required folder, such as Motors, Static Electrical Equipment, Converting Equipment, and so forth.

2. In the list view pane, select the items that you require.

   

   • You can also associate a single load without selecting a batch of loads in the Item Tag pane of the Electrical Index. This way you can associate different loads belonging to any load category in the Electrical Index. For more details, see Associate a Single Load with a PDB.

   • Also, you can select the required loads in the EDE.

3. Select Actions > Batch Load Association.

4. On the Batch Load Association dialog, under Power distribution board, select the required power distribution board.

5. From the Bus list, select a bus with which you want to associate the loads.

6. On the Bus tab, specify the rated data for the selected bus as needed and select Apply.

7. Select the Loads tab.

8. Select Add Selected Loads to add the items to the Associated loads list. (You selected these items in the list view pane of the Electrical Index.)

9. In the Associated loads box, scroll to the right and define the phase assignment of the current load by selecting the appropriate Phase check boxes.

   

   • For a single-phase load, select one of the Phase check boxes.

   • If you want a single-phase load to simulate a two-phase load which is connected to a three-phase bus, select two of the Phase check boxes.

   • For a three- phase load, select all three Phase check boxes.

10. Under Create circuits and cells, select the Create circuits check box to automatically create a circuit for each associated load that has not been assigned to a circuit. Note that this option does not affect the loads that have already been assigned to circuits.

    

    • If you do not select the check boxes under Create circuits and cells, the software associates the selected loads with a power distribution board or a bus. You can create circuits at a later time.

    • Note that circuits have a property called CircuitMode with values Connected and Disconnected. If you set this property to Disconnected, the drill down algorithm will stop the calculation there and will not roll up the loads connected to this feeder.

11. Select the Create cell check box to automatically create a cell where the new feeder circuit for the associated load will be created.

    Make sure that in the Properties window for the new cell, you select the In Use setting for the Cell Usage property.

12. Select Add to add other loads to the association.

13. On the Find dialog, in the Results data window, select the loads that you require.

    The software finds only those items that have the Is Load property in the Properties window set to True or if this item is defined as a Consumer in the Common Properties dialog. Also, the Find dialog displays only those load items that aren't connected to a bus.

14. Under Electrical consumption using coincidence factors, select one of the following calculation modes:

    • For direct loads only — to calculate the total consumed power only for those loads that are connected directly to the current bus.

    • For all feeders — to calculate the total consumed power for all the loads fed by the current bus as well as the loads that are fed by the buses that are connected to the current bus (as specified in Options Manager). When you select this option, the Circuits tab becomes available.

    You can set a preference that instructs the software to take into account any existing transformer power losses. For details, see Set All Feeder / Multi-Sheet Load Summary Report Preferences.

15. Select Re-Calculate to refresh the display of the calculated values.

    When selecting a PDB that contains a large downstream electrical distribution system, it may take some time for the software to perform all the calculations before it displays all the values. To avoid this situation, when opening the Batch Load Association dialog, the software displays the values that were stored in the database during the last calculation. Selecting the Re- Calculate button allows you to re-calculate and refresh the display the current calculation values.

• When creating a plant item in the Electrical Index, and if the plant item properties that are included in the Manage Operating Cases dialog have default values, these values are set in all the existing operating cases of the current plant. Note that default values are set in the Data Dictionary Manager or the Project Wide Parameters in Options Manager.

• When creating a plant item in the Electrical Index by dragging an item from the Reference Data Explorer and if the reference item has properties that are included in the Manage Operating Cases dialog , the values that appear in those properties are copied only to the active case of the current plant. All other cases in the plant will contain default values if they exist. If no default values have been set for those properties, all the other operating cases will not contain any values for those properties.

  When calculating load totals for buses and circuits, the software stores the name of the plant operating case that was used during the latest calculation. The name of this operating case is displayed at the top of the Properties window just above the toolbar and on the Batch Load Association dialog . Note that the Last Calculated Case Name and Last Calculated Case Description properties are available when defining EDE layouts and relevant reports.

1. To associate loads that have been associated only with a PDB and not with a bus, select the Unassigned Loads tab.

2. Under Unassigned loads, select the item tag type and the Select check box for each load that you want to associate.

3. Select Assign to Bus.

   The software moves the selected load to the Loads tab.

4. Select Apply.

5. Select the Bus tab and define the bus rated data.

   If, after calculating the rated power for all feeders, you move to the Bus tab and change the bus data, make sure that you select Apply before you switch back to the Loads tab.

6. Select the Loads tab and set the load phases.

7. Continue adding loads as you require and then select OK when done.

   For information about associating a load with a different bus, see Balance Bus Loads.

The following table summarizes the information presented on the Loads and Circuits tabs of the Batch Load Association dialog:

• Electrical items are included in calculations if they are defined as consumers. In addition to loads, you can define converting equipment items, cabinets, local panels, and junction boxes as consumers. To define an electrical item as a consumer, you have to set the Is Load property in the Properties window for that item to True or define the electrical item as a Consumer in the relevant Common Properties dialog.

• If you define a converting equipment item, local panel, or junction box as a consumer and perform a drill-down calculation, the software uses the rated and consumed electrical load values of the equipment as the load values, the software ignores the entire branch that is connected downstream from the equipment. Note that you enter the pertinent rated and consumed electrical load values on the Common Properties dialog of the equipment item.

• You can assign a load to a particular phase only if you defined the properties of the current bus as having an AC supply and you set a value for the number of phases.

• The software displays the calculated consumption values according to the loads associated with each bus for the selected phase. If you do not select any bus from the Bus list, the software calculates the consumption for the entire power distribution board.

• The software can take into account converting equipment power losses if you have set your report preferences accordingly. For details, see Set All Feeder / Multi-Sheet Load Summary Report Preferences.

• If you associate a capacitor, the software subtracts the consumed kVAr value of that capacitor from the total connected consumed kVAr value. Therefore, the consumed electrical power (kVAr) may display a negative value. This means that there is a lagging power factor.

• When performing bus load association and assigning a load to another bus on the Cached Loads tab of the Bus Load Association dialog , the software checks if the selected load is associated with a heater that is connected through an auxiliary contact that is fed from the same circuit as the selected load. If the software detects such a heater, it will prompt you to move the associated circuit together with the load. If you click Yes, the software will move the load and its heater together with the associated circuit to another bus. If you click No, the software will only move the selected load without moving the heater or the circuit. In this case, you will have to move the associated heater manually.

• If a particular load associated with a selected PDB or bus contains incomplete data, the software displays an appropriate message in the Note box.

• To cancel an association of an item, under Associated loads, select a row and select Remove.

• You cannot dissociate a load if it is connected to a circuit.