The capacitor control monitors the voltage and current at a terminal of a PDelement or a PCelement and sends switching messages to a Capacitor object. The CapControl contains essential features of many typical utility capacitor controls.


Example:


New CapControl.C1ctrl element=Line.L1 Capacitor=C1

~ Type=Current ON=400 OFF=300 Delay=30


This control monitors the current in Line.L1 and switches Capacitor.C1 based on current magnitude. This is one of the simpler controls to implement. The capacitor will switch ON when the current in the monitored phase (defaults to 1) after a delay of 30 s. If the current drops below 400 A before 30 s has elapsed, the control resets (ignores the message from the control queue).


After energization, the capacitor switches off when the current drops below 300 with the default DelayOFF.


Element

Full object name of the circuit element, typically a line or transformer, to which the capacitor control's PT and/or CT are connected.There is no default; must be specified.

Capacitor

Name of Capacitor element which the CapControl controls. No Default; Must be specified.Do not specify the full object name; "Capacitor" is assumed for the object class. Example:
Capacitor=cap1

Type

{Current | voltage | kvar | PF | time } Control type. Specify the ONsetting and OFFsetting appropriately with the type of control. (See help for ONsetting)

CTPhase

Number of the phase being monitored for CURRENT control or one of {AVG | MAX | MIN} for all phases. Default=1. If delta or L-L connection, enter the first or the two phases being monitored [1-2, 2-3, 3-1]. Must be less than the number of phases. Does not apply to kvar control which uses all phases by default.

CTratio

Ratio of the CT from line amps to control ampere setting for current and kvar control types.

DeadTime

Dead time after capacitor is turned OFF before it can be turned back ON. Default is 300 sec.

Delay

Time delay, in seconds, from when the control is armed before it sends out the switching command to turn ON. The control may reset before the action actually occurs. This is used to determine which capacity control will act first. Default is 15. You may specify any floating point number to achieve a model of whatever condition is necessary.

DelayOFF

Time delay, in seconds, for control to turn OFF when present state is ON. Default is 15.

EventLog

{Yes/True* | No/False} Default is YES for CapControl. Log control actions to Eventlog.

OFFsetting

Value at which the control arms to switch the capacitor OFF. (See help for ONsetting)For Time control, is OK to have Off time the next day ( < On time)

ONsetting

Value at which the control arms to switch the capacitor ON (or ratchet up a step). 


Type of Control:


Current: Line Amps / CTratio Voltage: Line-Neutral (or Line-Line for delta) Volts / PTratio kvar: Total kvar, all phases (3-phase for pos seq model). This is directional. PF: Power Factor, Total power in monitored terminal. Negative for Leading. Time: Hrs from Midnight as a floating point number (decimal). 7:30am would be entered as 7.5.

PTPhase

Number of the phase being monitored for VOLTAGE control or one of {AVG | MAX | MIN} for all phases. Default=1. If delta or L-L connection, enter the first or the two phases being monitored [1-2, 2-3, 3-1]. Must be less than the number of phases. Does not apply to kvar control which uses all phases by default.

PTratio

Ratio of the PT that converts the monitored voltage to the control voltage. Default is 60. If the capacitor is Wye, the 1st phase line-to-neutral voltage is monitored. Else, the line-to-line voltage (1st - 2nd phase) is monitored.

terminal

Number of the terminal of the circuit element to which the CapControl is connected. 1 or 2, typically. Default is 1.

VBus

Name of bus to use for voltage override function. Default is bus at monitored terminal. Sometimes it is useful to monitor a bus in another location to emulate various DMS control algorithms.

Vmax

Maximum voltage, in volts. If the voltage across the capacitor divided by the PTRATIO is greater than this voltage, the capacitor will switch OFF regardless of other control settings. Default is 126 (goes with a PT ratio of 60 for 12.47 kV system).

Vmin

Minimum voltage, in volts. If the voltage across the capacitor divided by the PTRATIO is less than this voltage, the capacitor will switch ON regardless of other control settings. Default is 115 (goes with a PT ratio of 60 for 12.47 kV system).

VoltOverride

{Yes | No} Default is No. Switch to indicate whether VOLTAGE OVERRIDE is to be considered. Vmax and Vmin must be set to reasonable values if this property is Yes.