Functions of medium voltage distribution cabinet

Medium-voltage switchgear (rated voltage 3kV~35kV, core application voltage level 10kV/24kV) is a key device in the power system connecting the high-voltage grid and low-voltage distribution. Its core functions revolve around the safe distribution, control, protection, and monitoring of electrical energy, while also adapting to the power supply reliability requirements of industrial, infrastructure, and commercial scenarios. The following is a breakdown of its specific functions (including technical details and application scenario relevance):

I. Core Basic Functions: Power Distribution and Transfer

1. High-Voltage Power Dividing and Distribution

Function Description: Receives medium-voltage electrical energy from the upstream high-voltage grid (e.g., 35kV) or power plant output. Through internal busbars, disconnect switches, and other components, it distributes the energy to multiple downstream circuits (e.g., workshop production lines, transformers, large equipment), achieving a "one-in, multiple-out" power distribution mode.

Technical Details: Supports single busbar, double busbar, or segmented busbar designs. A double busbar structure ensures uninterrupted power supply during maintenance (e.g., continuous power supply requirements for industrial production).

Application Scenarios: Factory power distribution rooms distribute 10kV power to transformers in various workshops; commercial complexes divert 10kV power to circuits for central air conditioning, elevators, charging piles, etc.

2. Voltage Level Transition Interface

Function Description: As an intermediate hub between high-voltage (e.g., 110kV) and low-voltage (e.g., 380V) systems, it provides a stable medium-voltage input interface for transformers, supplying power to terminal equipment after voltage step-down by the transformer.

Key Configurations: Equipped with busbar bridges, wall bushings, and other components to ensure insulation and current-carrying capacity during voltage transition.

Application Scenarios: In residential power distribution rooms, 10kV distribution cabinets connect to transformers, stepping down the voltage to 380V/220V for residents; wind farms transfer 10kV power generated by wind turbines to a step-up substation and integrate it into the power grid.