Structural characteristics of drawer-type distribution cabinets

Release time:

2024-10-30

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Abstract

The structural characteristics of the drawer-type distribution cabinet are as follows:

 

  1. Cabinet shell
  • :
    • Material: Generally made of steel plate to form a closed shell, which has good mechanical strength and protective performance, capable of protecting internal electrical components from external environmental influences such as dust, moisture, and collisions. The steel plate material also has good conductivity, ensuring the reliability of the cabinet's grounding and safeguarding the safety of operators.
    • Craftsmanship: The manufacturing process of the cabinet body is usually quite refined, going through multiple processing steps such as cutting, stamping, welding, and spraying to ensure the dimensional accuracy and appearance quality of the cabinet body. The surface of the cabinet may undergo painting or plastic spraying treatments to enhance its corrosion resistance, rust resistance, and insulation performance.
  • Drawer structure:
    • Independence: The drawer is the core component of the drawer-type distribution cabinet, with each drawer being an independent functional unit that houses electrical components for incoming and outgoing circuits.
  • . This independent structural design allows each drawer to be operated, maintained, and replaced individually without affecting the normal operation of other drawers, improving the reliability and maintainability of the distribution cabinet.
  • Modularity: The drawers are designed in a modular way, allowing for combinations and configurations based on different electrical circuit requirements. Common drawer specifications include 1/2 unit, 1 unit, 1.5 units, 2 units, 3 units, etc., enabling users to select suitable drawer modules according to actual needs and flexibly build distribution systems.
  • .
  • Guide rails and plug-in structure: Guide rails are installed on both sides inside the drawer, coordinating with corresponding structures on the cabinet body to allow for easy insertion and removal of the drawers. The design of the guide rails ensures smooth insertion and removal of drawers while also being able to bear the weight of the drawers and internal electrical components. During the insertion and removal process of the drawers, there are also guiding devices and positioning devices such as U-shaped guide blocks and positioning pins to ensure that the drawers can be accurately inserted into designated positions.
  • Interlocking device: To ensure operational safety, drawer-type distribution cabinets typically have mechanical interlocking devices. When the drawer is in a closed state, the interlocking device prevents it from being pulled out arbitrarily to avoid tripping under load; only when the drawer is in an open state can it be pulled out for maintenance or repair.
    • .
  • Separation and isolation
  • :
    • Functional area separation: Between functional units and busbars or cables, they are usually separated by grounded metal plates or plastic functional boards to form three areas: busbars, functional units, and cables. This separation method effectively prevents electrical interference between different areas, enhancing the electrical performance and safety of the distribution cabinet.
    • Drawer isolation: There are also isolation measures between each drawer unit to prevent a fault in one drawer unit from affecting the normal operation of other drawer units, limiting faults to a minimal range.
  • Bus system:
    • Bus arrangement: Busbars are generally arranged in a flat layout; this arrangement provides good dynamic and thermal stability for the device and can withstand large short-circuit current impacts.
    • Bus connection: Busbars are connected to drawer units through plugs or terminal blocks to ensure reliable transmission of electrical energy. At the same time, this connection method also facilitates busbar expansion and maintenance.
  • Control and indication components:
    • Operating handle: Each drawer is equipped with an operating handle that allows control over the positions of closing, opening, testing, pulling out, and isolating the drawer; it is simple and convenient to operate.
    • .
    • Indication device: Drawer-type distribution cabinets typically have indicator lights, ammeters, voltmeters, and other indication devices to display parameters such as working status, current, voltage of the drawers for easy monitoring and judgment by operators.
  • Cable connection: The cable chamber is usually located at the bottom or side of the cabinet body; cables can connect with drawer units or busbars through vertical entry and exit methods.
  • . The design of the cable chamber is reasonable for laying out, fixing, and wiring cables while ensuring that cable connections are secure and reliable.

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