18 thousand hectares of forest will be restored in Karelia this year.
Karelian company plans to displace reinforced concrete poles of power lines from the Russian market.
When a tree is harder than a stone. Karelia is ready to "stake out" Russia on the Finnish technology.

Advantages of wooden poles

The use of wooden poles has a number of advantages over the use of reinforced concrete and metal:

  • Easy transportation and installation
    Wood is strong, elastic and, most importantly, lightweight material. The specific gravity of impregnated wood is 700 kg/m3. The wooden pole is three times lighter than the reinforced concrete analog. A nine-meter pole with a flexural strength at the top of the rack 8.2 kN weighs only 300 kg. Accordingly, the loading rates of trucks and railway coach increased several times, which significantly reduces transportation costs.

    To install the wooden poles don't need heavy machinery.

    Reinforced concrete supports SV-164, used for the construction of overhead power lines with a voltage of 35 kV and 110 kV, the transportation of which is significantly more expensive because of their overall dimensions (length 16.4 m), replaced by a wooden structure, U-shaped lower height.

    Wooden poles produced at the Seesyarvskiy Poles Impregnation Plant donít require foundations, they are installed directly in the ground, concrete prefixes aren't used.

    Easy to climb servicing personnel on wooden poles.
  • Not require careful handling
    Unlike wooden poles with reinforced concrete supports shouldn't be subjected to shocks, sharp jolts, jerks. When the poles are taken out to the track it is necessary to prevent their deflection and each time to shift wooden spacers. Transportation of reinforced concrete poles with the help of trailers-dissolution strictly prohibited.
  • Work well for bending
    The use of wooden impregnated poles on high-voltage lines meets the goals of increasing stability in the case of icy-wind loads, which often canít withstand reinforced concrete supports.
  • Absence of buckling of supports in permafrost soils
    In the northern regions, one of the major problems is the buckling of power transmission towers from the ground when theyíre pushed out of the ground a meter and a half meter.

    Itís known that wet loose soils of the seasonally thawing or seasonally frozen layers in the autumn and winter the freezing of the increase in volume. During spring-summer thawing, the volume decreases, shrinkage occurs. Itís these seasonal processes of swelling and soil sediment, repeated year after year, bulging out (freeze) the poles or any other solids from the ragged soils.

    Unlike reinforced concrete, the wooden pole completely freezes into the surrounding soil. The adhesion forces of the freezing resist the forces of buckling from freezing in the active layer.
  • Absence of destruction of supports in watered soils
    Reinforced concrete poles donít withstand operating conditions in watered and saline soils - their service life is reduced to 3-7 years. Wooden poles, impregnated with antiseptic CAA - durable and extremely resistant to any weather conditions and environment, they donít rot and donít get wet.
  • Absence of a "domino effect"
    A heavy reinforced concrete pole, falling, drags the next supports over the whole anchor span. A wooden pole held on wires strung, which reduces the number of outages on the lines.
  • Practically unaffected by abrasive wear
    When transporting galvanized metal supports, each of them must be transported in a separate package, which excludes damage to the zinc layer.
  • Have a much higher level of isolation
    Wood has exceptional dielectric properties due to the absence of leakage currents the use of wooden poles provides significant energy savings when transferring it over a long distance, allows to reduce the number of isolators, as well as to abandon the use of overhead ground-wire cable lines 35-110 kW.

    RAO UES in its letter of 03.10.2001 emphasized the special importance of use of wooden poles of new generation in areas with frequent bird deaths on overhead lines.

    Wooden pole provides a considerable isolation distance from the point of view of impulse overvoltages and can extinguish the power arc overlap, provides high resistance of the earth fault circuit. These properties used to reduce the number of lightning outages of transmission lines and safety.

    Impulse body strength wooden poles over 200 kV/m. This property is extremely useful in areas with high thunderstorm activity. A lightning strike even at a considerable distance can induce overvoltages on the transmission line with an amplitude of hundreds of kilovolts. The presence of wooden poles excludes overlapping of insulation and disconnection of the line in such cases. The high resistance of wooden poles provides increased safety of lines for people in the event of damage to the main insulation.

    The resistance of the pole's body strongly depends on the moistening. For example, the minimum resistance of a wet pine is about 20 kOhm/m, and the dry one is on the average 100 times larger. High resistance of wood and high contact resistance at the touch of man to pole with damaged insulation limits current through human with quantities not dangerous to life (40-100 mA).

  • Allow joint suspension of lines of 10 kW, 0.4 kW and street lighting
    High mechanical characteristics of wood allow to mount on one pole together wires of power lines 0,4 and 10 kV, as well as street lighting.
  • Have better fire resistance
    Highly effective impregnation composition CCA not only prevents wood rotting, allowing extend the service life of poles to 70 years, but also has fire resistance. Based on the studies conducted the Senezh Wood Preservation Laboratory, it was noted that copper-, chromium-containing preparations reduce the combustibility of wood. Moreover, wooden structures in case of fire resist fracture longer than metal or concrete. The last ones due to the yield strength of the metal may collapse in the first 15-20 minutes of a fire.
  • Vandal resistant
    No items that can be stolen
  • Have twice the service life!
    Wooden poles donít require maintenance during the service life of several decades. The service life of high-quality wooden pole exceeds the standard lifetime of the power transmission line as a whole. Service life of the poles, past two-stage mechanical processing, eliminating the appearance of cracks during exploitation, as well as impregnated with foreign antiseptic CCA, is 70 years!
  • Cost including installation is lower by 3.5 times!
    We suggest that you familiarize yourself with comparative analysis and calculation of savings when using wooden poles of new generation on the following page.