Block complete reinforced concrete two-transformer substations (2BKTP) with a capacity of 1600 kVA

General Data 5

1. Purpose and scope.

1.1. Block complete reinforced concrete two-transformer substations (2BKTP) with a capacity of 1600 kVA are designed for power supply to residential, public and industrial consumers.

1.2. 2BCTP is designed for use in areas with the following natural and climatic conditions:

- climatic area - I... IV with estimated winter outside temperature

air from minus 10 to minus 30 ° С (SNiP 230199);

- snow area - I... IV with standard value of snow cover weight 50.0; 70,0; 70,0; 100,0; 150.0 kgf/m? (0,5; 0,7; 1,0; 1.5 kPa) (SNiP 2.01.0785);

- wind area - I... IV with standard value of wind pressure 23.0; 30,0; 38,0; 48.0 kgf/m? (0,23; 0,3; 0,38; 0.48 kPa) (SNiP 2.01.0785);

- terrain - conventionally horizontal platform;

- soils - homogeneous, non-sedimentary, unpowered, groundwater are absent;

- seismicity of the construction site - up to 6 points.

2. Main characteristics of the building:

- fire resistance rating of the building - I (SNiP 2.01.0285 *);

- responsibility level - II (GOST 2775188 *).

3. Space-planning solutions.

3.1. 2BKTP consists of four prefabricated reinforced concrete elements: two underground pallet modules and two ground modules.

3.2. Ground modules and pallet modules are provided with embedded elements, which are welded to each other during installation, ensuring fixation of the article in the operating position.

3.3 The underground pallet module is a precast reinforced concrete element of trough shape with plan dimensions of 2.7x5.7 m, height 1.4 (1.9) m. The thickness of the enclosing structures is 80 mm. The pallet module is designed to receive loads from the ground module and transfer them to the ground of the base, as well as to accommodate cables and an oil receptacle.

3.4 Ground modules are solid-molded reinforced concrete elements of box-shaped shape with plan dimensions of 2.7x5.7 m, height of 2.9m, thickness of enclosing structures of 80 mm. Each of the modules consists of two compartments separated by a reinforced concrete partition. The power transformer compartment is designed to accommodate the power transformer, and the switchgear compartment is designed to accommodate the low voltage switchgear (LV switchgear) and the high voltage switchgear (LV switchgear)

3.5. Construction drawings of the modules are given in the album IZH4.120.003 "Reinforced concrete modules for complete transformer substations" (album No. 2; inv. No. EAP5.00.004/2).

4. Design solutions.

4.1. The modules are designed in the form of solid-molded three-dimensional elements with a thickness of enclosing structures of 80 mm.

4.2. Modules are made of heavy fine-grained concrete of class B25, F100, W6.

4.3. Reinforcement of modules is provided by separate welded grids and

individual reinforcement rods from reinforcement steel of class AIII as per GOST 578182. 7

4.4. The thickness of the protective layer of concrete for reinforcement is not less than 15 mm.

5. Anti-corrosion measures.

5.1. The modules are designed in the form of solid-molded three-dimensional elements with a thickness of enclosing structures of 80 mm.

5.2. All concrete surfaces in contact with the soil shall be coated with hot bitumen in two layers.

5.3. Paint all metal elements and articles, except for specified ones, with PF115 enamel (GOST646576 *) in 2 layers by soil layer GF021 (GOST 2334378).

6. Main construction indicators:

- total area - 28.3 m;

- building area - 30.8 m;

- construction volume of ground part - 82.2 m;

- construction volume of the underground part - 45.6 (60.9) m.

7. Heating and ventilation.

7.1. 2BKTP heating is not provided.

7.2. Ventilation of transformer compartments - natural and forced on the basis of PUE. Air is exchanged through louver grilles. For transformers with a capacity of 1600 kVA, louvres are made in the lower (inflow) and upper (exhaust) parts of the gate and in the side parts of the transformer compartments. In the switchgear compartment, ventilation is carried out through louver grilles installed in the compartment doors and through grilles in the base.

7.3. Ventilation calculation is given in Appendix 1.

8. Electrical part.

8.1. In the two-transformer BCTP, a single partitioned (two sections using a disconnector) bus system is adopted for 10 (6) kV voltage, to which two inputs, two power transformers with a capacity of 1600 kVA and two outgoing lines are connected. The sectional disconnector is installed during installation.

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8.2. In 2BKTP at a voltage of 0.4 kV, a single-section system of prefabricated tires is adopted.

8.3. Power transformers of TMG11 type with capacity of 1600 kVA are provided for in 2BKTP.

8.4. RVN is provided from standard KSO386 chambers with load switches of VNPM type of KSO285 and KSO298 chambers with vacuum load switches, RM6 monoblocks, SafeRing cells with rated current up to 1000A.

8.5. LVSV is provided from standard UVR units with 0.4 kV outgoing lines on fuse switches and circuit breakers.

8.6. The 2BKTP provides for the installation of auxiliary boards of the SCB and security alarm boards.

8.7. CSR cameras, UVR units, ShchSN and ShchOS were accepted by the production of the STORGE LLC plant in St. Petersburg.

8.8. The 2BKTP provides for the installation of active and reactive energy metering with heating in the UVR compartment manufactured by STORGE LLC in St. Petersburg.

8.9. Connection of the power transformer to the RUV is provided by single-core cables APvVng10.

8.10. Connection of the power transformer to RUNN aluminum tire AD31T.

8.11. Voltmeters with switches are installed on the doors of the lead-in panels to measure voltage on the LVSV sections. To measure the current of each phase, ammeters are installed at the LV input. Current transformers and active and reactive energy meters on the LV side are installed in the switchgear compartment at the customer's request.

8.12. Working lighting at voltage 220V is adopted in compartments of 2BKTP. Repair, portable lighting and lighting of CSR cameras are made at 24V voltage. All lighting is carried out by filament lamps. Heating of metering boards is provided by NEX18 with voltage of 220 V. Power supply of the lighting network is accepted from auxiliary boards of ShSN.

8.13. In order to enable automatic disconnection of the 10kV (HV) load circuit breaker when the fuses in the power transformer lines are burnt, when the substation is tied at a specific facility, it is necessary to supply power 1 ~ 50Hz 220V to the disconnecting coils of the specified HV from an independent source.

8.14. Grounding and lightning protection.

2BKTP provides a combined grounding device for electrical installation up to 1kV and above 1kV. The inner grounding circuit is made of 4x40 mm strip steel. The transformer neutral on the 0.4 kV side is connected to the grounding loop by a 4x40 mm strip steel. Grounding of cases of electric equipment and devices proizvoditsyadvumya MG25 wires. All loop connections shall be welded in accordance with GOST 526480. The internal grounding circuit is rigidly connected to the external grounding conductor, which is carried out in accordance with the design of connecting the substation to the terrain.

To protect the CSTP from direct lightning strikes, the reinforcement of reinforced concrete modules is connected by welding in a single electric circuit, which is connected to the protective ground of the CSTP by four outlets, which corresponds to PUE 4.2.134 ("If there is a reinforced concrete roof and continuous electrical connection of its individual elements, the protection is performed by grounding its reinforcement .") .

10. Fire fighting measures.

The project provides for the completion of 2BKTP with a box with sand packed in bags of 3 kg.

11. Installation instructions.

11.1. Transformers are rolled up and rolled out into chambers using channels. Installation of transformers is provided on channels (guides) lying freely on the floor. To secure the transformer on the guides, stops are provided on both sides of the transformer.

11.2. The case of the transformer and metal guides have to be connected by MG25 wire to the grounding contour provided in a transformer compartment (see Paragraph 8.14).

11.3. Cables of 10 kV and 0.4kV voltage are brought inside 2BKTP through holes located in the side walls of cable pallets. Holes for high-voltage and low-voltage cables are located at a distance of 1.6 m from each other. Cables are located inside asbestos pipes at the point of entry into the pallet.

11.4. After the cables are laid, the holes are sealed with sealant providing fire resistance for at least 45 minutes or with M150 cement mortar. Inside the cable tray, the cables shall be laid without crossing each other on the cantilevers in compliance with the distances specified in PUE (para. 2.3.123).