Tailor-made solutions in response to increased demands on supply quality … paper 2.66 by DREWAG – Stadtwerke Dresden GmbH (Germany)

Dresden - capital of Saxony is a symbiosis of high technology and baroque Sachsen  also known as "Silicon Saxony"

Fundamental statements The basic standard of supply quality is a balance between the customers’ quality demands and the acceptance of the resulting costs in general. Changes in the basic standard are only possible in the long term and at great expense. Increased requirements for supply quality call for customer-specific solutions.

110 kV grid of Dresden Location of mask house 380 kV G 380 kV Caption: 110 kV overhead line 110 kV underground line 110 kV undergrond line (planned) 110-kV/MV-substation 110-kV/MV-substation (planned) power plant with 110-kV/MV-substation Elbe 380-kV/110-kV/MV-substation pumped-storage power station with 110 kV network node 380 kV

Connection of switchgear to 20 kV grid Wilschdorf substation Klotzsche substation n.o. C n.o. C Automatic transfer gear D n.o. GQ A B C MV switchgear mask house n.o. n.o. UPS 1 UPS 2 UPS 3 UPS 4 automatic bypass hand bypass D E HQ Connection to customer

Commissioning tests – Power failure Measuring-point GQ Current L1 (GQ busbar)  GQ Current L1 (HQ busbar) UPS 2 UPS 3 UPS 4 HQ Phase-to-earth voltage L1 (HQ busbar) Measuring-point HQ

Principal conclusions Cooperation as partners is necessary already in the planning stage  economic efficiency is the scale. Simply configured customer plants for: classification of consumption points economical system management. Desensitisation of plants and equipment sensitively to faults.