Home generator revitalization

The home generator revitalization project was carried out in 2018-2019 at Vlasinske HEPPs Surdulica, Vrla 1 HEPP, under investor EPS, Đerdap HEPP Branch, Kladovo. It included designing, reconstruction of the existing equipment, and delivery and installation of new equipment — a 750 kVA three-phase synchronous generator (stator and rotor), a Pelton turbine with associated mechanical equipment, and a system for management, initialization, protection and synchronization of the generator in the network.

In addition to the main generators in Vrla 1 HEPP, a home generator was installed, intended to be the source of power supply for self-consumption of all 4 power plants. The generators at Vlasinske HEPPs operate at power system loading. The source of the main supply for self-consumption on all Vlasinske Hydroelectric Power Plants is a 10 kV network, via transformers of 10/0.42 kV gear ratios and corresponding rated powers. The 10 kV network connects all 4 power plants and power supply is possible from 3 sources:

• Main power supply source – via one of two transformers with 35/10 kV gear ratio, 1000 kVA rated power and 110/35 kV transformer from 110 kV network in “Vrla 3” HEPP
• Backup power supply source – via home generator in “Vrla 1” HEPP of 0.4 kV voltage, 750 kVA power, and a transformer with 10/0.4 kV gear ratio, 1000 kVA power
• Safety power supply source – via 10 kV power line between “Vrla 1” HEPP and Valjevica and 10 kV switchgear in “Vrla 1” HEPP

The home generator is a horizontal single-jet Pelton turbine that drives a 750 kVA three-phase synchronous generator. It is located in the left part of the powerhouse, viewed upstream, at an elevation of 869.00 meters above sea level.

The generator is intended to be the source of power supply for self-consumption of all 4 power plants – Vrla 1, 2, 3 and 4. By correct and reliable handling, the home generator may be utilized in the next 30 years. Fully automatic operation of the generator with remote control was also provided.