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I. Definition
A distribution cabinet (also known as a distribution box or panel) is a complete set of distribution equipment in the power system where switches, protection devices, and instruments are centrally installed; it is the terminal equipment of the distribution system. Core functions: distributing electric energy, controlling on/off, protectng circuits, and monitoring status.
II. Core Functions
- Distribution: Distributes upstream electric energy to various power circuits/devices
- Control: Manual/automatic start/stop, switchig circuits
- Protection: Automatically cuts off power during overload, short circuit, leakage, or overvoltage
- Monitoring: Displays voltage, current, power, and electricity consumption
- tenance: Narrows down fault scope, facilitates maintenance
III. Main Classification (By Voltage)
1. High Voltage Distribution Cabinet (≥1kV)
- Vltage: 6kV, 10kV, 35kV
- Application: Substations, power plants, large factories
- Types: Fixed type, Draw-out type (witdrawable)
2. Low Voltage Distribution Cabinet (≤1kV)
- Voltage: 220V/380V
- Application: Most widely used in industrommerce, and residential areas
- Types:
- GGD: Fixed type, economical and general-purpose
- GCS/GCK/MNS: Drawer type, convenient maintenance, high relability
IV. Classification by Function/Purpose
- Infeed Cabinet: Receives the main power supply
- Outfeed Cabinet: Distributes power to various loads
- Metering Cabinctric energy metering and billing
- Capacitor Compensation Cabinet: Improves power factor, energy saving
- Power Cabinet: Controls motors and equipment
- Lighting Cabinet: Power distribution ing circuits
- Explosion-proof/Corrosion-resistant/Outdoor Cabinet: For use in special environments
V. Basic Composition
- Cabinet Body: Metal enclosed/semi-enlosed shell
- Primary Circuit: Circuit breakers, contactors, busbars, cables
- Secondary Circuit: Instruments, indicator lights, buttons, relays
- Protective Eleents: Fuses, thermal relays, leakage protection devices
VI. Application Scenarios
- Industry: Factory workshops, mines, fans, water pumps, production lines
- Construction: Officgs, shopping malls, residences, floor distribution boxes
- Infrastructure: Tunnels, subways, road lighting
- Special: Petrochemical (explosion-proof), offshore platfs (corrosion-resistant)
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