Installation conditions of substations and transformers

Transformer installation 1. The installation of transformers and substationsshall comply with the following regulations: 1.1 Before installing transformers and substations, the decoration surfaces of indoor ceilings and walls shall be completed and there shall be no water leakage, the leveling layer of the ground shall be completed, the foundation shall be inspected and qualified, and the conduits buried in the foundation and the reserved holes for transformer inlet and outlet lines and related embedded parts shall be inspected and qualified; 1.2 Before the transformer and substation are powered on, the acceptance test of the transformer and system grounding shall be qualified 2. The transformer shall be installed in the correct position, with complete accessories, the oil level of the oil-immersed transformer shall be normal, and there shall be no oil leakage. 3. The grounding connection method and grounding resistance value of the neutral point of the transformer shall meet the design requirements. 4. The transformer box, the bracket, the foundation steel and the shell of the Dry-Type Transformer shall be reliably connected to the protective conductor separately, and the fasteners and anti-loosening parts shall be complete. 5. Transformers and high-voltage electrical equipment shall be put into use only after the acceptance test is completed and qualified. 6. The fence gates of the power distribution room and the static compensation device should be reliably connected to the protective conductor with a copper core soft wire, and its cross-sectional area should not be less than 4mm2. 7. The transmission part of the on-load voltage regulator should be well lubricated, the action should be flexible, the inching given position should be consistent with the actual position of the switch, and the automatic adjustment should meet the requirements of the product's technical documents. 8. The insulating parts should be free of defects such as cracks, defects, and porcelain damage, the surface should be clean, and the temperature measuring instrument should indicate accurately. 9. For transformers with protection level requirements, when opening holes on the high-voltage or low-voltage and other insulation cover plates, the protection level requirements of the transformer should be met. #2 Installation of distribution cabinets and control cabinets 1. The installation of complete sets of distribution cabinets, control cabinets (tables, boxes) and distribution boxes (panels) shall comply with the following regulations: 1.1 Before installing complete sets of distribution cabinets (tables) and control cabinets, the decoration works of indoor ceilings and walls shall be completed, without water leakage, the leveling layer of indoor floors shall be completed, the foundation steel and the cable trenches under the cabinets, tables and boxes shall be inspected and qualified, and the foundations of floor-standing cabinets, tables and boxes and the conduits buried in the foundation shall be inspected and qualified; 1.2 Before installing the distribution box (panel) mounted on the wall, the indoor ceiling, walls and decorative surfaces shall be completed, and the reserved holes of the concealed control (distribution) box and the wire boxes and conduits for power and lighting wiring shall be inspected and qualified; 1.3 Before connecting the power line, it should be confirmed that the model and performance parameters of the surge protector (SPD) meet the design requirements, and the grounding wire and PE row are reliably connected; 1.4 Before the trial operation, the PE bus in the cabinet, table, box and panel should be connected, the specifications and models of the components in the cabinet, table, box and panel should meet the design requirements, the wiring should be correct and the handover test should be qualified. 1.5 The layout and safety spacing of the distribution cabinet, table, box and panel should meet the design requirements. 1.6 The distribution cabinets, tables and boxes should be connected with each other or with the foundation steel with galvanized bolts, and the anti-loosening parts should be complete; when the design has fire protection requirements, the entrances and exits of the cabinets, tables and boxes should be fireproof and sealed tightly. 1.7 Wiring between distribution cabinets, platforms, boxes and panels shall comply with the following provisions: 1) The wiring of the secondary circuit shall comply with the design requirements. Except for the electronic component circuit or similar circuit, the rated voltage of the insulated wire of the circuit shall not be less than 450/750V; for the conductor cross-sectional area of ​​the copper core insulated wire or cable, the current circuit shall not be less than 2.5 mm2, and other circuits shall not be less than 1.5 mm2. 2) The secondary circuit connection wires shall be bundled and tied. Different voltage levels, AC, DC lines and computer control lines shall be tied separately and marked; after being fixed, they shall not hinder the pulling out or pushing in of the trolley switch or the withdrawable components. 3) The bending radius of the cable shall not be less than the allowable bending radius of the cable. 4) The wire connection shall not damage the wire core.

2. The installation of lighting distribution boxes (panels) shall comply with the following regulations: 2.1 The opening of the box body shall be compatible with the diameter of the conduit, the cover of the concealed distribution box shall be close to the wall, and the coating of the box (panel) shall be complete; 2.2 The circuit numbers in the box (panel) shall be complete and the markings shall be correct; 2.3 The box (panel) shall be made of non-combustible materials. 2.4 The box (panel) shall be installed firmly, correctly positioned, and have complete components. The installation height shall meet the design and maintenance requirements. 2.5 The wiring in the box (panel) shall be neat and free of twisting; the wire connection shall be tight, without damaging the wire core and breaking the strands. The cross-sectional area of ​​the wire pressed on both sides of the screw under the washer should be the same, and the wire connection on the same electrical device terminal should not be more than 2, and the parts such as anti-loosening washers should be complete; 2.6 The switch action in the box (panel) should be flexible and reliable; 2.7 Neutral conductor (N) and protective grounding conductor (PE) busbars should be set separately in the box (panel), and the same terminal on the busbar should not be connected to N or PE of different circuits. 3. The metal frames and foundation steel of distribution cabinets, desks and boxes should be reliably connected to the protective conductor; for openable doors equipped with electrical appliances, the grounding terminals of the doors and metal frames should be connected with yellow-green insulated copper core soft wires with a cross-sectional area of ​​not less than 4m2, and should be marked.