Load Tap Changer

LoadTapChanger represents power transformer controls that change the primary to secondary turns ratio of a transformer winding while the transformer is under load to regulate the flow of current and minimize voltage drop. Automatic loadtap changers in the power transformer provide voltage control on the substation bus. Control systems of voltage regulators and tap changing equipment beyond the substation usually have a line-drop compensator to simulate voltage drop between the substation and points in the distribution system.

Associations: PowerTransformer

Subtypes: None

Model Names: LOADTAPCHANGER

Attributes:

Field Name

Field Type

Description

BoostPercent

text

Code indicating tap setting for increase in capacity achieved by increasing the maximum voltage level; domain values include 4 percent, 6 percent, etc.

BuckPercent

text

Code indicating tap setting for increase in capacity achieved by lowering the maximum voltage level; domain values include 4 percent, 6 percent, etc.

Impedance

text

Impedance of LoadTapChanger in ohms.

PwrTransformerObjectID

long integer

ObjectID of associated Power Transformer.

RatedkVA

long integer

System rating in kVA.

RelayControlType

text

Type of relay control.

SwitchType

text

Type of switch used.

XRRatio

long integer

Inductance/resistance ratio.

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