Architectural and space-planning solutions:

The project documentation designed a 3-storey brick building with a basement for an electrical substation. Dimensions of the building in terms of - 37,28 x 18,76 m, height to the top of the parapet - 16,50 m. The thickness of the outer walls - 640 mm. L1 type staircases are provided. Roof - combined, flat rolled. A decorative cornice is designed along the perimeter of the parapet, imitating a sloping roof. Exterior finish - wet plaster with two colors. So-kol - terrazitic plaster.

Structural and space-planning solutions.

The level of responsibility of the designed building is II, normal. The constructive scheme of the building is longitudinal-wall. The building of the transformer substation was designed with brick walls 640, 250 and 380 mm thick made of ordinary clay bricks M125, F50 on mortar M100 with facades finished with plaster. Basement walls - monolithic reinforced concrete, concrete class B25, F150, W6. Thickness of external walls - 640 mm, internal - 640 and 380 mm. Interfloor ceilings and roofing - monolithic reinforced concrete ribbed slabs 150 mm thick (concrete class B 25), with ribs with a section of 200 x 400 mm, the pitch of the ribs is variable 1,1 ÷ 2,3 m. Stairs - prefabricated reinforced concrete steps on metal stringers. The building is equipped with overhead crane beams and a monorail with a carrying capacity of 3,2 tf. Partitions - brick 120 mm thick. The spatial rigidity and stability of the building is ensured by the joint work of the vertical load-bearing elements of the building and monolithic ceilings. The calculation of the building together with the foundation was carried out using the calculation complex ING + 2007. A relative elevation of 0,000 corresponds to an absolute elevation 6,660 m. The foundations were designed in accordance with engineering and geological surveys carried out at the construction site in 2009. A combined pile-slab foundation was adopted as the foundation of the building. Bored piles with a diameter of 510 mm and a length of 22 m from the surface of the layout are carried out under the protection of the casing. The design load on the piles is assumed to be 110 tf, based on the results of field tests of bored piles with a static indentation load. The base of the piles are gray silty sandy loam with gravel and pebbles, semi-hard (IL = 0,14; E = 180 kg/cm2). The connection between piles and grillage is rigid. Grill plate 500 mm thick. Under the slab there is a concrete preparation 100 mm thick made of concrete of class B 7,5 for crushed stone preparation 300 mm thick. Material of piles and grillage - concrete B25, F150, W6. The expected average draft is 4,29 cm. The groundwater level was recorded at a depth of 2,3-3,0 m from the earth's surface. The maximum position of the groundwater level is at absolute levels of 4,2÷4,8 m. Groundwater is slightly aggressive in terms of the content of aggressive carbon dioxide in relation to concrete of normal permeability. The project provides for coating waterproofing of surfaces in contact with the ground, the use of low-permeability concrete. The normative depth of soil freezing is 1,69 m. The projected building is located in the existing building: it is located at a distance of 2,0 m from the existing TP building and is located at a distance of 16,5 m from the residential area, to the "blank" wall of the hostel of the military school - 10,8 m. Surveys of buildings were carried out in 2007 . The project provides for measures that exclude the occurrence of deformations and additional sediments of the existing substation building: reinforcement of the walls of the existing substation building with metal clips from the corners; to ensure the stability of the wall along the A / 1-2 axis, the installation of overlays from channels; installation of inextricable tension belts around the perimeter of the building at the level of the ceiling and coating of steel strands Ø32 mm, connected by threaded lanyards and welding with steel corners; at the border with the existing substation building, the project provides for the installation of a boundary wall using the “wall in the ground” method, 21,17 m long, from secant piles Ø380 mm and 9 m deep. excavation in the pit is planned to be carried out under the protection of the Larsen IV sheet piling, 8 m long.

Engineering equipment, engineering networks, engineering activities:

The design documentation provides for the construction of a step-down substation SS 11/10/6 kV No. **** and a cable line 110 kV: SS 101A - SS "*******", SS **** to the point "**", point "A" - PS "*******". The substation is designed to supply consumers in the city center and remove loads from the existing substation No. *****. Closed substation with the highest voltage of 110 kV contains all the equipment and systems of protection and control in one building. Enclosing structures of the building provide all types of safety - electrical, fire, environmental, social and others. Closed installation of electrical equipment, transformers and cable lines localize magnetostrictive and fan noise of transformers within the same building, as well as possible oil leakage. Electromagnetic emissions at a voltage of 110 kV do not exceed the standards, both outside the building and inside it. The main scheme of the substation is provided according to the block principle - a transformer - a line with a sectional jumper. Each connection is connected through a protective switching device, which excludes the development of an accident. The block diagram increases reliability and allows each transformer to be considered as an independent power source that provides power receivers of the first category in terms of reliability. Each transformer has two step-down windings 10 and 6 kV, providing power distribution to feed the existing network at a voltage of 6 kV and the formation of a new 10 kV network. The operation of the substation is provided for by means of automation without the constant presence of maintenance personnel. Laying of each CL (three phases) - in an independent reinforced concrete tray, below the freezing depth, mainly within the roadway of the UDS. Mechanical protection is provided by the cover of the tray and the hard surface of the road pavement. Each CL 110 kV is equipped with one FOCL cable, which provides an electronic digital information transmission channel, including a cable protection channel in case of internal damage (ground faults). Water supply is designed from an existing water supply system with a diameter of 150 mm through two inputs, the estimated flow rate is 0,5 m3/day, guaranteed pressure at the point of connection 30,0 m.w.st. Consumption for internal fire extinguishing - 10,4 l / s, the number of fire hydrants - 12 pcs., external fire extinguishing - 20 l / s. Removal of domestic wastewater in volume 0,5 m3/day supplied to the public sewer. Discharge of domestic wastewater with a total flow rate of 0,5 m3/day, as well as discharge of surface water from the roof and adjacent territory with a flow rate of 9,2 m3/day. and drainage water, is provided for in the nearest manhole of the combined yard communal sewerage. Power supply for own needs is provided at a voltage of 0,4 kV, from two transformers SN 10 / 0,4 kV with a capacity of 630 kVA each. For the electrical safety of operating and maintenance personnel (OVB and ORB), systems for equalizing and equalizing the potentials of a step and a touch and a grounding device are provided, including natural and artificial ground electrodes, providing a contact resistance of less than 0,5 Ohm (according to technological requirements). Communication systems, information transmission, security, fire alarms and other low-voltage systems are designed in accordance with the standards. Heating of the premises of the substation is provided by electric convectors. Convectors are installed in rooms without heat emission. In the battery room, convectors are explosion-proof. Ventilation - forced-air and exhaust with mechanical and natural motivation. Air exchange is calculated by multiplicity and for the assimilation of excess heat. Independent systems are provided for premises with various functional purposes. Supply air units are direct-flow, with electric heating in air heaters. For each 110 kV transformer chamber, installations with two fans (reserve) are provided. Each fan provides 50% of the design flow. During the cold season, systems operate with one fan and 50% recirculation. During the transition period and warm periods - with one fan and completely outdoors. When the room temperature reaches more than 350C, two fans of each system operate simultaneously. The battery rooms are provided with a supply and exhaust ventilation system with mechanical drive, explosion-proof fans with a reserve. Natural exhaust ventilation is provided. In supply and exhaust systems serving rooms with increased heat release from equipment, standby motors or fans are provided. Ventilation of fire-hazardous premises is carried out by separate systems. In the premises of the main switchboard of the auxiliary needs of the substation and control panels, for the assimilation of heat inflows from the equipment, air conditioning is provided on the basis of "split systems" of the company "Mitsubishi Electric". If one system fails, the total required cooling capacity of 20 kW is provided. Air conditioners work both for cold and for heat. Supply and exhaust units - manufactured by "Systemair" (Sweden). From rooms equipped with gas fire extinguishing, it is planned to remove combustion products after a fire by general ventilation systems, from cable rooms - by portable exhaust ventilation systems.