Transformer

The Transformer feature class captures information about distribution and power transformers. Subtypes include Network, Single Phase Overhead, Single Phase Underground, Two Phase Overhead, Three Phase Overhead, Three Phase Underground, Step, and Power.

Characteristics of transformers include voltage rating (kV), power rating (MVA), impedance (%), loss evaluation, temperature rating (degrees Celsius), and cooling class. Distribution transformers convert electrical energy from primary voltages to utilization voltages. Primary voltages range from 34.5/19920 Grounded Y to 4160Y/2400 Grounded Y volts. A transformer winding may have tap changers, separately for voltage and phase angle.

Transformer inherits attributes from the abstract classes ElectricDevice and TransformerBank. Any model names assigned to these classes should be assigned to Transformer as well.

Associations: LoadTapChanger (only valid for Power Transformer), NetworkProtector (only valid for subtype Network), TransformerUnit

Subtypes: Network, Single Phase Overhead, Single Phase Underground, Two Phase Overhead, Three Phase Overhead, Three Phase Underground, Step, Power, Open Delta, and Open Wye. The use of subtypes is optional. The Subtype attribute can be removed if subtypes aren't used in the model.

Model Names:

Attributes:

Field Name

Field Type

Description

Alternate[X,Y,Z]

double

Stores the X, Y, and Z values from a GPS device.

AlternateSource

text

This field contains a value from the Feature Source domain that indicates an alternate source for the structure.

HighSideConfiguration

text

Configuration of primary side of Transformer; domain values include SinglePhaseLine-Ground, Open, SinglePhaseLine-Line, Wye. HIGHSIDECONFIGURATION

LowSideConfiguration

text

Configuration of secondary side of Transformer; domain values include 3 Wire Delta, 4 Wire Delta, Delta, Single Phase, Wye

LowSideGroundReactance

double

Ground reactance of secondary side in ohms.

LowSideGroundResistance

double

Ground resistance of secondary side in ohms.

LowSideProtection

text

Code indicating type of overcurrent protection used at the secondary side of the Transformer; the Network and Power subtypes use a Yes/No Indicator domain on this field; this field is not applicable to all other subtypes.

LowSideVoltage

long integer

The voltage on the secondary winding of the transformer.

RatedkVA[A,B,C]

double

Sum of rated kVA of related transformer units, per phase; domain values include 100kVA, 1000kVA, etc. The RatedKVA on Transformer validation rule uses the RATEDKVA model name on this field. Designer's Secondary Circuit Analysis also uses this model name.

SwitchType

text

Code indicating type of switch.

The following attributes apply to the Power Transformer subtype:

LoadTapChangerIndicator

text

Yes/No indicator that indicates whether or not a load tap changer is present on the transformer.

EmptyWeight

double

The weight of the transformer without coolant oil.

FilledWeight

double

The weight of the transformer with coolant oil.

HeightBushings

double

The height of the bushing above the mounting flange.

HeightNoBushings

double

Height of the transformer before bushings installed.

RatedKVA65Rise

long integer

The rated KVA given a maximum of 65 degrees Celsius average winding temperature rise over a 30 degree Celsius ambient air temperature.

RatedTertiaryKVA

long integer

The rated KVA of the tertiary winding.

TertiaryConfiguration

text

The configuration of the tertiary winding.

TertiaryVoltage

long integer

The voltage of the transformer's tertiary winding.

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