TransformerFunctionKind
Type: enum (of string)
Function of a transformer.
Must be one of:
"TransformerFunctionKind.powerTransformer"
"TransformerFunctionKind.secondaryTransformer"
"TransformerFunctionKind.other"
"TransformerFunctionKind.voltageRegulator"
"TransformerFunctionKind.autotransformer"