Czech transmission and distribution system – Part 3: Lines (Protection zones, 110 kV and 220 kV lines)

Following the instalment dedicated to transmission system substations, this instalment of the mini-series will cover the very-high-voltage and extra-high-voltage lines operated by ČEPS. Given the breadth of the topic, we will cover transmission system lines in several articles. This article provides basic information on lines in general, including protection zones, as well as a list of 110 kV and 220 kV lines with key information about them.

Our website has already published articles coveringpylons andconductors, which are indispensable components of every line.

Line protection zones

Key legislation for the energy sector is Act No. 458/2000 Coll. on the conditions for doing business and the exercise of state administration in the energy sectors and on amendments to certain acts, referred to as the Energy Act. This act also defines the term line protection zone, which is an area in the immediate vicinity of a line intended to ensure its reliable operation and protect the life, health and property of individuals.

Protection zones safeguard not only overhead lines, but also underground lines and substations. The protection zone of a very-high-voltage or extra-high-voltage overhead line is a continuous area defined by vertical planes on both sides of the line, at a specified distance measured perpendicularly from the outer conductor.

These distances from the outer conductors depend on the voltage level of the overhead line and, under currently applicable legislation, are defined as follows:

• 110 kV line – 12 m
• 220 kV line – 15 m
• 400 kV line – 20 m

The size of the protection zone is affected by the date the line was built, specifically the date on which the occupancy permit became final. For lines whose occupancy permit became final before 31 December 1994, the protection zones are larger, namely:

• 110 kV line – 15 m
• 220 kV line – 20 m
• 400 kV line – 25 m

Use of this part of the land by its user is restricted within the protection zone of an overhead line, in that the following are prohibited in the protection zone:

• constructing buildings or placing structures and other similar equipment, as well as storing flammable and explosive substances, without the line owner's consent
• carrying out earthworks without the line owner's consent
• carrying out activities that could endanger the reliability and safety of line operation or threaten the life, health or property of individuals
• carrying out activities that would prevent or substantially hinder access to the line

Furthermore, planting hop gardens and allowing vegetation to grow above a height of 3 m are prohibited in the protection zone of an overhead line. Finally, within the protection zone of a line, as well as outside it, everyone is obliged to refrain from conduct that could damage the line or restrict and endanger its safe and reliable operation. All activities must be carried out in such a way as to prevent damage to energy facilities.

110 kV lines

V9001

• Temelín – Kočín
• Region: South Bohemian
• Line length: 3 km
• Year commissioned: 1994
• Single-circuit line
• The line provides backup power supply to the Temelín nuclear power plant from the power system.

V9002

• Temelín – Kočín
• Region: South Bohemian
• Line length: 3 km
• Year commissioned: 1994
• Single-circuit line
• The line provides backup power supply to the Temelín nuclear power plant from the power system.

V1344/1345

• Kočín – Dasný
• Region: South Bohemian
• Line length: 30 km
• Year commissioned: 1995
• Double-circuit line

V1346/1347

• Kočín – Hněvkovice
• Region: South Bohemian
• Line length: 8 km
• Year commissioned: 1995
• Double-circuit line
• The line carries output from the Hněvkovice hydroelectric power plant into the transmission system.

220 kV lines

V001/002

• Orlík – Milín
• Region: Central Bohemian
• Line length: 9 km
• Year commissioned: 1962
• Double-circuit line – Soudek
• The line carries output from the Orlík hydroelectric power plant into the transmission system.

V011

• Vítkov – Tisová
• Region: Karlovy Vary
• Line length: 8 km
• Year commissioned: 1960
• Double-circuit line – predominantly Soudek
• The line carries output from the Tisová power plant into the transmission system.

V201

• Výškov – Čechy-Střed
• Line length: 85 km
• Regions: Ústí nad Labem and Central Bohemian
• Year commissioned: 1951
• Single-circuit line – Portal
• This is the oldest transmission system line route; it originally ran from Výškov to Opočínek and was connected to the Čechy – Střed substation in 1960.

V202

• Čechy-Střed – Opočínek
• Line length: 71 km
• Regions: Central Bohemian and Pardubice
• Year commissioned: 1960
• Predominantly single-circuit line – Portal
• It was created through the construction of the Čechy – Střed substation, which split the original V201 line.

V203

• Opočínek – Sokolnice
• Line length: 136 km
• Regions: Pardubice, Vysočina and South Moravian
• Year commissioned: 1952
• Single-circuit line – Portal
• The first transmission system line to connect Bohemia and Moravia.

V204

• Milín – Tábor
• Line length: 59 km
• Regions: Central Bohemian and South Bohemian
• Year commissioned: 1962
• Predominantly single-circuit line – Portal
• The line originally ran from Milín to Sokolnice, but was connected to the newly built Tábor substation.

V205/206

• Malešice – Čechy-Střed
• Line length: 20 km
• Regions: Prague and Central Bohemian
• Year commissioned: 1967
• Double-circuit line – Donau

V207

• Tábor – Sokolnice
• Line length: 169 km
• Regions: South Bohemian, Vysočina and South Moravian
• Year commissioned: 1973
• Predominantly single-circuit line – Portal
• It was created through the construction of the Tábor substation, which split the original line from Milín to Sokolnice.

V208

• Milín – Čechy-Střed
• Line length: 86 km
• Regions: Central Bohemian and Prague
• Year commissioned: 1960
• Predominantly single-circuit line – Portal

V209

• Čechy-Střed – Bezděčín
• Line length: 68 km
• Regions: Central Bohemian and Liberec
• Year commissioned: 1964
• Predominantly double-circuit line – Donau (running parallel with V454)
• In 2007, the double-circuit V454/209 line, created by doubling the original V209 line, was commissioned.

V210

• Chotějovice – Bezděčín
• Line length: 98 km
• Regions: Ústí nad Labem and Liberec
• Year commissioned: 1965
• Predominantly single-circuit line – Portal

V211

• Výškov – Chotějovice
• Line length: 30 km
• Region: Ústí nad Labem
• Year commissioned: 1965
• Predominantly double-circuit line – Donau and Soudek

V216

• Přeštice – Milín
• Line length: 64 km
• Regions: Plzeň, South Bohemian and Central Bohemian
• Year commissioned: 1963
• Single-circuit line – Portal

V221/222

• Vítkov – Přeštice
• Line length: 86 km
• Regions: Karlovy Vary and Plzeň
• Year commissioned: 1963
• Double-circuit line – Donau
• In 2019, the line was dismantled and construction is currently under way in the corridor on a new 400 kV line designated V490/491.

V223/224

• Hradec – Vítkov
• Line length: 70 km
• Regions: Ústí nad Labem and Karlovy Vary
• Year commissioned: 1960
• Double-circuit line – predominantly Soudek
• The line will be dismantled and replaced by a new 400 kV line.  Construction is expected to take place from 2022.

V225/226

• Výškov – Hradec
• Line length: 31 km
• Regions: Ústí nad Labem
• Year commissioned: 1957
• Predominantly double-circuit line
• A branch line from V226 connects to the VTŽ Chomutov substation.

V226T

• VTŽ Chomutov branch line
• Line length: 9 km
• Regions: Ústí nad Labem
• Year commissioned: 1979
• Predominantly double-circuit line – Donau
• A branch line to the former Chomutov Tube Rolling Mill and Ironworks; a photovoltaic power plant is now located on part of the site of the former factory.

V243/244

• Sokolnice – Bisamberg (Austria)
• Line length: 51 km
• Region: South Moravian
• Year commissioned: 1959
• Double-circuit line – Soudek
• The first cross-border line built to Austria.

V245/246

• Lískovec – Kopanina (V245)/Bujakow (V246) (Poland)
• Line length: 23 km
• Region: Moravian-Silesian
• Year commissioned: 1959
• Double-circuit line – Soudek
• The first cross-border line built to Poland.

V251/252

• Prosenice – Sokolnice
• Line length: 84 km
• Regions: Olomouc, Zlín and South Moravian
• Year commissioned: 1953
• Double-circuit line – predominantly Soudek

V253/254

• Lískovec – Prosenice
• Line length: 71 km
• Regions: Moravian-Silesian and Olomouc
• Year commissioned: 1952
• Double-circuit line – Soudek

V270

• Lískovec – P. Bystrica (Slovakia)
• Line length: 61 km
• Regions: Moravian-Silesian and Zlín
• Year commissioned: 1952
• Single-circuit line – Portal
• The first transmission system line to run into the territory of present-day Slovakia.

V280

• Sokolnice – Senica (Slovakia)
• Line length: 67 km
• Regions: South Moravian
• Year commissioned: 1964
• Single-circuit line – Portal
• Cross-border line to Slovakia.

Source: ČEPS a.s.