Load Display

See Also

 

The Load Display presents data describing each load in the case. The Load Display is a class of Case Information Display and therefore can be used in a manner consistent with all other case information displays. It has a case information toolbar from which you can print, copy, and modify its information as well as view the information dialog of its associated loads. The toolbar also affords the opportunity to insert new loads into the model or to delete existing ones. Moreover, it enables you to invoke the Quick Power Flow List and Bus View Display for the load’s terminal bus. You can also sort the load information by clicking on the heading of the field by which you want to sort. Additionally, you can choose to restrict the information shown by the Load Display according to the constraints of the area/zone/owner filters.

To show the load display, select Network > Loads in the Model Explorer.

 

The load display contains the following fields by default:

Number, Name

Number and name of bus to which the load is attached.

ID

Two-character ID used to distinguish multiple loads at the same bus; ‘1’ by default.

Status

Either Closed if the load is connect to its bus, or Open if it is not. You can click on this field to toggle its value. If the load is open, the entire load record is dimmed.

MW, Mvar, MVA

Total real, reactive, and complex power for the load. Loads may be voltage dependent. The total load is the sum of the constant power, constant current, and constant impedance components. See Load Information and Load Modeling for more information.

S MW, S MVAR, I MW, I MVR, Z MW, Z MVR

These six fields describe the composition of the load at the bus assuming 1 pu bus voltage. The SMW and SMVAR fields indicate the constant power portion of the load, the component that does not vary with bus voltage magnitude. The IMW and IMVR fields express the constant current part of the load, which varies in proportion to the bus voltage magnitude. Finally, ZMW and ZMVR indicate the constant impedance portion of the load, which varies with the square of the voltage. The sum of the SMW, IMW, and ZMW fields yields the base MW load at the bus (assuming 1 pu voltage), and the sum of the SMVR, IMVR, and ZMVR fields provides the base MVR load at the bus (assuming 1 pu voltage). Please see Load Modeling for more details on how bus load is modeled.

DistMW, DistMvar, DistStatus

Added in Version 19 Distributed Generation MW and Mvar values may be specified with each load record. These values are only used when the Distributed Generation status is set to Closed. When Closed then this represent the distributed generation MW and Mvar represented inside this load. When this is in use, then the net MW and Mvar seen by the power flow solution algorithm will be equal to the Base Load Values minus the Distributed generation. Please see Load Modeling for more details on how bus load is modeled.