Technical specification for 10kv prefabricated cabin

2.1 General requirements for prefabricated cabins
2.1.1 Outdoor operation requires strong impact resistance, strong anti-theft and anti-vandal capabilities;
2.1.2 Strong anti-corrosion ability, guarantee 40 years of no rust;
2.1.3 Beautiful, generous and coordinated appearance;
2.1.4 The cabin is sealed to prevent dust, moisture and condensation;
2.1.5 Small size, compact structure, meeting the requirements of fire protection regulations.


2.2 Prefabricated cabin performance requirements 2.2.1 Overall requirements
2.2.1.1 The prefabricated cabin shall ensure sufficient mechanical strength and rigidity. It will not be deformed or damaged during lifting, transportation and installation, and will not affect the equipment in the cabin due to lifting and transportation; it has good seismic and wind resistance.
2.2.1.2 The overall protection level of the prefabricated cabin is not less than IP43, which has the effects of dustproof, moisture-proof and anti-condensation; the cabin body is strictly divided into compartments with steel plate and flame-retardant insulating partitions, and the protection level between each compartment It is IP40.
2.2.1.3 Prefabricated cabins should have good anti-corrosion performance to ensure that the cabins will not rust within 40 years, and other cabin accessories should reach the same service life level.
2.2.1.4 The prefabricated cabin shall have good thermal insulation performance to ensure that the temperature difference in the cabin does not fluctuate widely due to changes in the external environment temperature.
2.2.1.5 The design of prefabricated cabins should not be easy to accumulate dust and water. The top cover of the cabin should have an obvious water dispersion slope, which should not be less than 5%. The edge of the top cover should be provided with a drip edge to prevent rainwater from flowing back into the cabin.
2.2.1.6 The design of the fire detection and alarm system in the prefabricated cabin and the fire control equipment and its functions meet the requirements of the current national standard GB 50116-2014 "Code for Design of Automatic Fire Alarm System" and other relevant standards.
2.2.1.7 The grounding system of the prefabricated cabin meets the requirements of relevant standards such as GB/T 50065-2011 "Code for Grounding Design of AC Electrical Installations".
2.2.1.8 The lighting design in the prefabricated cabin shall meet the requirements of DL/T 5390-2014 "Technical Regulations on Lighting Design for Power Plants and Substations" and other relevant standards.
2.2.1.9 The ventilation design in the prefabricated cabin shall meet the requirements of DL/T 5035-2004 "Technical Regulations for Heating, Ventilation and Air Conditioning Design of Thermal Power Plants" and other relevant standards.
2.2.1.10 The prefabricated cabin shall have good electromagnetic radiation isolation and noise reduction functions, and comply with GB12348-2008 "Environmental Noise Emission Standards for Industrial Enterprises" and "HJ/T 24-1998 500kV Ultra-high Voltage Transmission and Distribution Engineering Electromagnetic Radiation Environment Evaluation of the requirements of relevant standards such as Technical Specifications.

2.2.2 Key technical requirements
2.2.2.1 Strength of prefabricated cabin
2.2.2.1.1 The underframe of the prefabricated cabin is welded by section steel. The cabin frame is a welded integrated structure. The main steel material should be high-quality carbon structural steel with a yield strength of not less than 235MPa and sufficient mechanical strength. And rigidity, no deformation during lifting, transportation and installation, GB17467 "high and low voltage integrated substation" impact test requirements, and withstand the following loads and impacts:
a) Top load: The minimum value is 2500N/3. ㄊ髁⒏Han 苫 grasshopper, Han sang, 桓Paper, ditch, mu, 吭test, 晌??.85KN/3 ?/span>
External mechanical impact on panels, doors and vents: The impact energy of external mechanical impact is 20J, and the corresponding protection level is IK10 of GB/T20138.
2.2.2.1.2 The prefabricated cabin frame, door panel and top cover are all made of high-quality steel plates, and it is not allowed to use metal materials such as color steel plate, galvanized plate and other non-metallic cabin bodies such as GRC and Jinbang board.
2.2.2.1.3 The design of the prefabricated cabin shall comply with GB50011-2010 "Code for Seismic Design of Buildings" and other relevant standards, meet the seismic requirements of horizontal acceleration of 0.3 (g), vertical acceleration of 0.15 (g), and seismic fortification intensity of 8 degrees.
2.2.2.1.4 While the prefabricated cabin adopts the bridge-breaking technology to achieve the thermal insulation effect, sufficient mechanical strength of the cabin shall be ensured. The inner and outer steel plates shall be connected by spot welding through punching slots, the inner and outer steel plates shall be lined with section steel, and independent brackets shall be provided. Calculate and design sufficient supporting structures.
2.2.2.2 Prefabricated cabin corrosion protection
The anti-corrosion treatment of the prefabricated cabin shall follow the ISO 12944 "Corrosion Protection of Paint and Varnish Protective Paint System on Steel Structures", and adopt multiple anti-corrosion processes, including pretreatment, zinc layer, intermediate layer, surface layer and other multiple treatment processes. It is necessary to ensure sufficient roughness on the surface of the steel plate, the thickness of the zinc layer should not be less than 60μm, and the total thickness of the middle layer and surface layer should not be less than 200μm, so as to ensure that the cabin can reach a 40-year anti-corrosion level under the C3 environment.

2.2.2.3 Prefabricated cabin insulation
2.2.2.3.1 The prefabricated cabin shall use "refrigerator" thermal insulation measures and technology, and use double-layer high-quality steel plates (the internal filling is made of polyurethane fireproof insulation materials approved by the Ministry of Construction to ensure the thermal insulation and fire resistance of the entire prefabricated cabin) + environmentally friendly metal Decoration layer. The thickness of the door panel is not less than 48mm, which guarantees the "24-wall" heat preservation effect.
2.2.2.3.2 Except for prefabricated cabins that require higher ventilation and heat dissipation (prefabricated cabins for reactive power compensation, etc.), an air conditioning system should be installed in the cabin to ensure the operating environment of the cabin equipment.
2.2.2.4 Sealing and dustproof of prefabricated cabin
2.2.2.2.1 The prefabricated cabin shall ensure good sealing performance. The cabin body shall be sealed with silicone rubber or EPDM material sealing strips, and the cable inlet and outlet shall be knocked out with sealing rubber rings or seals. The sealing material The life span of the product should be greater than 5 years, and a reasonable replacement plan should be developed and corresponding spare parts should be provided.
2.2.2.5 Prefabricated cabin ventilation
2.2.2.5.1 The ventilation design in the prefabricated cabin shall meet the requirements of DL/T 5035-2004 "Technical Specification for Heating, Ventilation and Air Conditioning Design of Thermal Power Plants" and other relevant standards.
2.2.2.5.2 When using forced ventilation, the fan shall be an imported, long-life, maintenance-free axial flow fan; the number of fans shall meet the requirements of exhaust air and dehumidification, and the exhaust air must be treated with multiple dust-proof treatments and dust-proof nets. It should be easy to disassemble, install and clean; the exhaust should be equipped with air valve and other structures to ensure the overall protection level of the cabin.
2.2.2.5.3 The cabinet is ventilated smoothly. If necessary, set up an automatic exhaust system to control the start and stop of the electric air inlet valve and forced exhaust axial fan of the cabinet. The air inlet valve and axial fan must be well set Dust removal filter device to ensure dustproof box.
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