#### 7.2.2.17 IfcTransformerTypeEnum

The IfcTransformerTypeEnum defines the range of different types of transformer that can be specified.

> HISTORY New type in IFC2x2.

Enumerated Item Definitions:

- CURRENT: A transformer that changes the current between circuits.
- FREQUENCY: A transformer that changes the frequency between circuits.
- INVERTER: A transformer that converts from direct current (DC) to alternating current (AC).
- RECTIFIER: A transformer that converts from alternating current (AC) to direct current (DC).
- VOLTAGE: A transformer that changes the voltage between circuits.
- USERDEFINED: User-defined type.
- NOTDEFINED: Undefined type.

XSD Specification:

<xs:simpleType name="IfcTransformerTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="current"/>
<xs:enumeration value="frequency"/>
<xs:enumeration value="inverter"/>
<xs:enumeration value="rectifier"/>
<xs:enumeration value="voltage"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcTransformerTypeEnum = ENUMERATION OF (
| CURRENT, FREQUENCY, INVERTER, RECTIFIER, VOLTAGE, USERDEFINED, NOTDEFINED);
END_TYPE;

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