STN and STNu type pole transformer stations with transformers with a power of up to 630 kVA for a voltage of 15 and 20 kV on single spun poles with a strength of up to 35 kN according to the PTPiREE study from 2007. The study consists of the following volumes:

PTPiREE - 21/01-2007: Station solutions - volume I

PTPiREE - 21/02-2007: Electrical and assembly drawings - volume II