Switch Unit

Switches are used to disconnect circuits for line sectionalizing, isolating equipment, and feeder realignment on distribution circuits.

Designer uses the DESIGNUNIT model name on this class to designate it as an electric device unit object class. The Designer Work Function Tool uses this model name to identify all electric device unit object classes.

Associations: Switch

Subtypes: None

Model Names: DESIGNUNIT

Attributes:

Field Name

Field Type

Description

BILRating

long integer

Code indicating rating of SwitchUnit BIL; values include 95 BIL, 125 BIL, etc.

ContactType

text

Code indicating type of contact of SwitchUnit; domain values include Posi-Lock and Standard.

GroundResistance

long integer

Resistance of ground of SwitchUnit in ohms.

InterruptingMechanismType

text

Interrupting mechanism of SwitchUnit.

InterruptingMedium

text

Code indicating interrupting medium of Switch; domain values include Air, Oil, SF6, Vacuum, etc.

Manufacturer

text

Manufacturer of the SwitchUnit.

MaxInterruptingCurrent

double

Code indicating maximum current in amps that opens SwitchUnit; domain values include 50 amps, 60 amps, 200 amps, etc.

SwitchObjectID

long integer

ObjectID of associated Switch.

International Data Model

In addition to the attributes listed above, the following attributes are used by the international electric data model.

Field Name

Description

AssemblyClass

A classification of switches according to an accepted standard, such as IEC 622771-100, giving indication of electric and mechanical endurance.

BreakingVA

Short circuit current breaking capacity for voltages in the rated voltage range (value is in Volt-Amperes).

CapacititiveBreakingCapacity

Breaking capacity for capacitive current (in Amperes).

GasVolumePressue

Pressure rating for interrupting medium (gas).

GrossWeight

Gross weight of switch unit, including ancillary equipment or cabinets (KG or LBS).

IntrinsicMakeTime

Minimum time needed to make (Seconds).

MakingCurrent

Short circuit making capacity (Amperes).

MotorVoltage

Rated operating voltage of the motor operator for the switch (Volts).

NoOfMakes

Maximum number of makes after power loss.

NoOfShortCircuits

Maximum number of operations before lock out (auto reclosing switches only).

Reclosing

Indicates whether the switch has automatic reclosing capability.

RestrictingVoltage

The maximum rated operating voltage of the switch unit (Volts).

ShortCircuitCurrent100ms

100-millisecond short-time current carrying capability (Amperes).

ShortCircuitCurrent1s

1-second short-time current carrying capability (Amperes).

ShortCircuitCurrent3s

3-second short-time current carrying capability (Amperes).

VisualEartchIndicator

Indicates whether the equipment has a visual grounding indicator.

Weight

Weight of switch unit (KG or LBS).

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