Regulator Control

Voltage provided by regulators is changed using a tap-changing switch to adjust the number of secondary windings. Line load can be regulated from 10 percent above to 10 percent below normal line voltage. Voltage regulators that control distribution system voltage are rated from 2.5 kV to 34.5 grd Y kV. Most feeder regulators have the 32-step design.

Voltage is measured by current transformers and potential transformers (PT) to provide control of system voltage level and bandwidth. The PT steps down the regulator (local) voltage and provides it to the control system, which compares voltage with the desired preset level. If the actual voltage deviates from preset voltage by plus or minus ½ the bandwidth, the tap-changing mechanism operates to bring voltage within the preset bandwidth. Minimum bandwidth is twice the size of the voltage step (2 times 5/8 percent or 1.25 percent).

The line-drop compensator simulates system impedance by adjusting resistance and reactance. The CT circulates current proportional to the load current through the resistance and reactance components and combines this voltage signal with the local voltage signal.

Associations: TransformerUnit

Subtypes: None

Model Names: None

Attributes:

Field Name

Field Type

Description

BandWidth

text

The range of voltage within which the line voltage is allowed to deviate before the regulator is activated.

CTPrimary

long integer

CT rating of primary side of regulator.

FirstHouseHighProtection[A,B,C]

long integer

Fuse type on primary side.

FirstHouseLowProtection[A,B,C]

long integer

Fuse type on secondary side of regulator.

PTRatio

long integer

PT ratio used to sense source voltage.

RSetting[A,B,C]

long integer

Setting of resistive component of line-drop compensation system per phase.

SCADAControlID

text

ID of SCADA control, if present.

SCADAMonitorID

text

ID of SCADA monitor, if present.

StepSize

long integer

Size of steps that voltage regulator has available at full regulation.

TapSetting[A,B,C]

long integer

Current tap setting per phase.

VoltageSetting[A,B,C]

long integer

Voltage setting per phase.

VoltageRegUnitObjectID

long integer

ObjectID of associated Voltage Regulator.

XSetting[A,B,C]

long integer

Setting of resistive component of line-drop compensation system per phase.

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