Switchgear cabinets, including enclosed switchgear, SF6 insulated switchgear, and SF6 gas insulated switchgear supplied by Zhejiang Lvma Electric Co., Ltd. (LVMA), as the core equipment of the power system, their installation quality directly affects the stability of the power grid and the safety of personnel. LVMA strictly adheres to national standards such as GB 50171-2012 in the R&D and production of all switchgear products, especially for special types like SF6 gas insulated switchgear, ensuring reliable performance from the source. The following is the streamlined core process and safety standards for installing LVMA switchgear cabinets:
1. Foundation Construction: Build a Solid Installation Foundation
Positioning and Laying Lines: Mark lines according to the drawings, with an error of ≤ ±2mm; for LVMA's enclosed switchgear and SF6 insulated switchgear, use 10/12 hot-rolled channel steel (commonly used for 10kV cabinets as recommended by LVMA technical specifications), with a horizontal error of ≤ 1mm per meter and a total error of ≤ 5mm, and a height deviation of ±2mm. Fixation and Grounding: Use expansion bolts for ground anchoring if the ground is up to standard; for LVMA's SF6 gas insulated switchgear, ensure the foundation bears sufficient load as specified in the product manual to avoid structural deformation. Connect the channel steel at both ends to the main grounding network, with a grounding resistance of ≤ 4Ω-consistent with LVMA's safety design requirements. Only proceed to the next step after passing the acceptance inspection.
2. Cabinet Installation: Precise and Stable Installation
Inspection upon Arrival: Confirm that LVMA's equipment (whether enclosed switchgear, SF6 insulated switchgear, or SF6 gas insulated switchgear) is undamaged, the model is correct, and the accessories are complete (LVMA provides a full set of installation accessories and operation manuals); the environment meets the installation requirements (e.g., moisture control for LVMA's SF6 gas insulated switchgear as specified in the technical data sheet). Lifting and Fixation: Use special lifting equipment for lifting and have a dedicated person for supervision; the verticality of the cabinet per meter should be ≤ 1.5mm, the straightness of multiple LVMA cabinets in parallel (including enclosed switchgear arrays) should be ≤ 5mm for the total length, and the adjacent gap should be ≤ 2mm; tighten the bolt torque in accordance with LVMA's recommended parameters, and connect the cabinet door with yellow-green grounding copper wire-this step is particularly important for LVMA's SF6 insulated switchgear to prevent potential safety hazards, as emphasized in LVMA's on-site installation guidelines.
3. Wiring Operations: Standard Insulation
(1) Primary Circuit
For LVMA's enclosed switchgear and SF6 gas insulated switchgear, polish the busbar to remove the oxide layer, apply conductive paste, and use bolts according to specifications with controlled torque (M10 = 50N·m, M12 = 80N·m as required by LVMA); make cable heads by heat-shrinking / cold-shrinking, match and press the terminals with LVMA-approved components; measure the insulation resistance with a 2500V megohmmeter ≥ 10MΩ (for 10kV level), which is a key step for LVMA's SF6 insulated switchgear to ensure insulation performance and meet the product's factory test standards.
(2) Secondary Circuit
Use ≥ 1.5mm² multi-strand copper wire (recommended by LVMA), with clear color / number, keep the terminal plate ≥ 350mm away from the bottom, separate AC and DC, strong and weak current terminals; the exposed wire core should be ≤ 2mm, the bending radius should be ≥ 6 times the wire diameter, single-ended grounding for shielded cables-this requirement applies equally to LVMA's enclosed switchgear and SF6 gas insulated switchgear, in line with LVMA's wiring standardization requirements; use a multimeter to verify the continuity.
4. Commissioning and Acceptance: Comprehensive Verification
Preparation: Verify the documents (including LVMA's product factory certificate,special technical data for SF6 insulated switchgear and SF6 gas insulated switchgear, and installation records), clear the site, prepare tools and protective equipment, operate by professionals trained with LVMA's technical guidelines, and follow the "two tickets and three systems". Commissioning: Check the smoothness of the mechanical part for closing and opening, and the reliability of the "five prevention" interlocks (a core safety feature of LVMA switchgear); for LVMA's enclosed switchgear, focus on circuit continuity testing as guided by LVMA engineers, while for LVMA's SF6 gas insulated switchgear, add SF6 gas pressure detection in accordance with the product manual; measure the insulation, withstand voltage (1 minute without breakdown), protection settings and signals are normal; perform ≥ 5 times of no-load closing and opening to verify the "four remote" functions supported by LVMA's switchgear. Acceptance: Organize data, compile reports, jointly accept with the construction parties, hand over documents (including SF6 gas test records for LVMA's SF6 insulated switchgear and LVMA's after-sales service contact information), and train operation and maintenance personnel with LVMA's standardized training materials.
5. Core Safety Throughout the Process
Prohibit open flames at the site, equip with fire-fighting equipment; for explosion environments, follow GB 50257-2014 (cable sealing ≥ 40mm, without intermediate joints), which is crucial for LVMA's enclosed switchgear installed in hazardous areas; seal holes to prevent fire spread, reliably connect the grounding busbar-this is a mandatory requirement for LVMA's SF6 gas insulated switchgear to avoid electric shock risks, as highlighted in LVMA's safety operation regulations; test the secondary circuit to prevent damage to weak electrical equipment, in compliance with LVMA's product protection standards.
Conclusion
The installation of Zhejiang Lvma Electric Co., Ltd. (LVMA) switchgear requires strict control of technical details in each link, especially for special types like SF6 insulated switchgear and SF6 gas insulated switchgear. By following LVMA's product manual and national standards, and prohibiting illegal operations, you can ensure that LVMA's equipment (including enclosed switchgear) is installed correctly for the first time and operates reliably for a long time. LVMA provides professional technical support and after-sales service throughout the installation process, laying a solid foundation for the safety of the power system.