Basic data of the transmission system for year 2021

Overhead transmission line – line lenghts

Voltage
(kV)
SingleDoubleVSVTotalDeployed lenght
(km)
4001 373,533472,85818,6781 865,0692 356,604
220409,686140,1880,000549,874690,062
1100,25421,09618,67840,02879,802
Sum total1783,473634,14237,3562 454,9713126,468

Overhead transmission line – number of towers

Voltage (kV)SingleDoubleVSVTotal
4003 9581 480645 502
220125145401 705
110181082
Sum total5 2102015647 289

Electrical substations

Voltage (kV)Number of substationsNumber of fields
40020147
220637
110124
Sum total27208

Development (Trend) of substations quantity

Network transformers

Voltage ratio (kV/kV)Number of transformersTotal power (Gross power) (MVA)
400/22031 400
400/110319 230
220/11061 200
Sum total4011 830

Development (Trend) of transformers quantity

Development of transformation capacity (MVA)

Protection and automatic devices

Voltage (kV)Number of digital protection devicesNumber of electromechanical protection devicesNumber of electronic protection devicesNumber of hybrid protection devices
4006860262
2201273110
110185600
3532300
3359000
2251700
10.5642230
6.39000
0.417000
Sceleton37040
Sum total1 22151442

Number of protection and automatic devices