Switched Shunt Display Objects

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Switched shunts are either capacitors that supply reactive power to the system or reactors that absorb reactive power. Simulator represents switched shunts as a number of blocks of admittance that can be switched in a number of discrete steps or over a continuous range. Switched shunt display objects come equipped with a circuit breaker that indicates the shunt's status. If the switched shunt is closed, the circuit breaker appears as a filled red square. If the switched shunt is open, the circuit breaker appears as a green square outline. To change the status of the switched shunt, click the corresponding circuit breaker.

Switched shunt fields are often placed next to switched shunts to indicate the amount of reactive power supplied by the device. For switched shunts with such a field, you can manually increase the reactive power supplied by the device (provided its control mode is discrete) by clicking on the up-arrow associated with the device's reactive power field. Likewise, you can decrease the reactive power supplied by the device by clicking on the down-arrow. To make the up/down arrows visible, set the Delta per Mouse Click on the switched shunt field to a nonzero value.

Right-clicking on the switched shunt displays the Switched Shunt dialog. Use the Switched Shunt dialog to inspect or modify the model of the switched shunt.

You can add a new switched shunt to the case in Edit Mode. Select Network > Switched Shunt from the Individual Insert ribbon group on the Draw ribbon tab. Click the bus where you would like to attach the device. The Switched Shunt dialog will appear. The bus number is automatically determined from the bus to which you attached the capacitor. A switched shunt can also be added without connecting it to a bus, but the bus information must be entered manually. Enter the size, the thickness of the pen [in pixels] used to draw the device, and its orientation. The Nominal Mvar field gives the amount of reactive power the device would supply if its terminal voltage were 1.0 per unit. The Control Mode field determines whether the switched shunt has a fixed value or will vary discretely or continuously within its operating limits to maintain its terminal voltage within the voltage range specified in the Voltage Regulation field. A line will be drawn through a switched shunt display object if Control Mode is Continuous or SVC.

The amount of shunt admittance is specified in the Switched Shunt Blocks table. The columns in this field correspond to different blocks of admittance. The first row indicates the number of steps in each block, and the second row gives the amount of nominal Mvars per step. The switched shunts are always switched in the order specified in this field.

Select OK to add the device. If you do not want to add the switched shunt to the case, select Cancel.

To modify the parameters for an existing switched shunt, position the cursor on the device and right-click. This again brings up the Switched Shunt dialog. You can then change any parameter of the switched shunt. Make use of the tools in the Formatting ribbon group to change the color and/or line thickness.

To delete an existing switched shunt, use the Cut or Delete commands in the Clipboard ribbon group.