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  Basic data of the transmission system
 
 Basic data of the transmission system for year 2017
 
 Overhead transmission line - line lenghts
Voltage
(kV)
Lenght of line rout (km) Deployed lenght (km)
Single Double VSV Total
400 1 341,385 379,728 18,678 1 739,791 2 138,197
220 543,660 141,113 0,000 684,773 825,886
110 0,254 21,093 18,678 40,025 79,796
Sum total 1 885,299 541,934 37,356 2 464,589 3 043,879
 
Overhead transmission line - number of towers
Voltage
(kV)
Simple Double VSV Total
400 3 877 1 188 64 5 129
220 1 693 456 0 2 149
110 1 81 0 82
Sum total 5 571 1 725 64 7 360
 
Electrical substations
Voltage
(kV)
Number of substations Number of fields
400 19 132
220 6 42
110 1 24
Sum total 26 198
 
Development (Trend) of substations quantity

 
Network transformers
Voltage ratio
(kV/kV)
Number of transformers Total power (Gross power)
(MVA)
400/220 3 1 400
400/110 29 8 710
220/110 8 1 600
Sum total 40 11 710
 
Development (Trend) of transformers quantity
 
 
Development of transformation capacity (MVA)
 

Protection and automatic devices

Voltage
(kV)
Number of digital protection devices Number of electromechanical protection devices Number of electronic protection devices Number of hybrid protection devices
400 665 15 33 2
220 165 9 12 0
110 178 12 0 0
35 27 0 15 0
33 47 0 0 0
22 7 17 0 0
10.5 60 22 3 0
6.3 9 0 0 0
0.4 16 0 0 0
Sceleton 37 0 4 0
Sum total 1 211 75 67 2
 
Number of protection and automatic devices