Distribution Equipment Hierarchy (DEH) Data Overview

The Distribution Equipment Hierarchy (DEH) API defines how service points and other system equipment are electrically connected. Generally, DEH indicates which service points connect to which transformers, which transformers are in which feeder sections, which sections make up a feeder, and which feeders are on a substation.

In App Platform, distribution equipment can be defined by up to six different types:

• Substation. A high-voltage bus, typically greater than or equal to 69 kV, providing energy to a substation bank.
• Substation Bank. A large transformer that changes voltage from a transmission voltage to a distribution voltage, which is typically between 4 kV and 45 kV.
• Feeder. A point immediately below a substation bank where power exits a substation to serve the demand of all customers connected to the feeder.

• Feeder Section. A device along a feeder, such as a switch, a fuse, a regulator, a step-down transformer, or other device.

  Note: Feeder Sections are optional levels of the distribution equipment hierarchy.

• Transformer. A device that changes the voltage from a distribution voltage to a service voltage, generally less than 480 V, before delivering electricity to a service point.
• Service Point. A point where a customer meter is installed and electricity consumption is measured.