PNNL Taxonomy Feeders

Abstract

This model is one of 24 prototypical feeders as well as including limited equipment information. The number of nodes includes only the primary distribution system; there are additional nodes in the secondary system. The secondary system nodes are on the customer side of their service transformer. These are the nodes, and links, that model the connections from the service transformer to the service meters via triplex or other cables. As discussed earlier in section 2.2 the classification process separated the feeders into three voltage classes; 12.47 kV, 25.00 kV, and 35.00 kV. In the actual feeder models it will be seen that voltages other than these three are used. From Tables 3 and 4 it can be seen that within the 12.47 kV cluster there are 12.47 kV and 13.8 kV feeders. This fact is represented in the following feeder descriptions

Climate Region 1 Climate region 1 is the West Coast of the United States and is characterized by a temperate climate. Within climate region 1 there are 4 12.47 kV feeder types and 1 25.00 kV feeder type.

This feeder is a representation of a moderately populated urban area. This is composed mainly of mid-sized commercial loads with some residences, mostly multi-family. Approximately 85% of the circuit-feet are overhead and 15% underground. It would be expected that this feeder is connected to adjacent feeders through normally open switches. For this reason it would be common to limit the feeder loading to 60% to ensure the ability to transfer load from other feeders, and vice versa. Since this is a small urban core the loading of the feeder is well below 60%. The majority of the load is located relatively near the substation.