Associate a Single Load with a PDB - Intergraph Smart Electrical - Help - Hexagon

Intergraph Smart Electrical Help

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This procedure explains how to associate a single load with a selected power distribution board or bus. The software makes the associations and sums up the electrical consumption and the full load current that the associated load requires. This calculation facilitates the power distribution board design at an early planning stage.

  1. Select Actions > Batch Load Association.

  2. On the Batch Load Association dialog, under Power distribution board, select a power distribution board.

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

    SHARED Tip You do not have to select a bus if you do not want to associate any loads with a specific bus under the selected PDB. In this case, the software calculates the load consumption for the entire power distribution board rather than for a specific bus.

  4. Select the Loads tab.

  5. Select Add to open the Find dialog.

  6. From the Equipment type list, select the required equipment type.

  7. Select Find Now.

    SHARED Tip The software finds only those load items that have the Is Load property in the Properties window set to True or if this load is defined as a Consumer in the Common Properties dialog. In addition to loads, you can define other electrical items as consumers. These items are converting equipment items, local panels, and junction boxes. Also, the Find dialog displays only those load items that are not connected to a bus.

  8. From the data window, highlight the required load item tag.

  9. Select OK to associate the load with the selected PDB.

  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.

    SHARED Tip 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.

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

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

  12. Under Associated loads, scroll to the right and define the phase association 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.

  13. Select Apply and then select the Bus tab.

  14. Define the bus rated power as needed.

  15. To associate loads with a bus that have been associated only with a PDB, select Unassigned Loads.

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

  17. Select Assign to Bus.

  18. Select Apply and then select another PDB or another bus.

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

    SHARED Tip 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:

Item Type

Associated Loads Grid

Calculated Results

Circuits Tab

Loads connected directly to the selected bus.

Shown as non-compensated values.

Accounts for and shows consumed compensated values.

Not applicable

Converting equipment

Shown when defined as loads and presented as non-compensated values.

Accounts for and shows consumed compensated values.

Shown only if the converting equipment is not defined as a load.

Converting equipment losses

When this preference is selected, the item tag is shown without any values.

Accounts for and shows non-compensated values.

Shown only if the converting equipment is not defined as a load.

Local panels and junction boxes

Shown when defined as loads and presented as non-compensated values.

Accounts for and shows consumed compensated values.

Not applicable

Cabinets and instruments

Shown as non-compensated values.

Accounts for and shows consumed compensated values.

Not applicable

Feeder circuit that feeds a downstream bus or converting equipment.

Not applicable

Accounts for and shows consumed compensated values.

Shown if it feeds an incomer circuit or converting equipment that is not defined as a load.

Coupler circuit

Not applicable

Accounts for and shows consumed compensated values.

Shown if it feeds a bus riser.

  • 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.

  • 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.

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

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

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