Under-the-transformer integrated distribution box
An under-the-transformer integrated distribution box is a compact, multifunctional low-voltage cabinet installed at the low-voltage side of a transformer, providing power distribution, protection, metering, and reactive power compensation.
Overview
Under-the-transformer integrated distribution boxes, often referred to as JP cabinets or low-voltage integrated distribution cabinets, are designed to be installed directly at the low-voltage side of transformers, typically with capacities ranging from 10 kVA to 630 kVA . They are widely used in urban power grids, rural distribution networks, industrial facilities, and residential communities . These cabinets integrate multiple functions into a single enclosure, reducing the need for separate equipment and saving space.
Key Functions
- Power Distribution and Control: They distribute electricity from the transformer to various feeders and loads, with the ability to control switching operations.
- Protection: Equipped with overload, short-circuit, leakage, overvoltage, undervoltage, phase loss, and zero-sequence protection to safeguard both equipment and users .
- Metering and Monitoring: Integrated meters and current transformers allow real-time measurement of voltage, current, and energy consumption. Some models support remote monitoring and control via GPRS or optical fiber .
- Reactive Power Compensation: Capacitor banks can be automatically switched to improve power factor and reduce transformer losses.
- Automatic Operation: Features like automatic reclosing after power failure and three-phase imbalance adjustment enhance reliability and reduce downtime .
Design and Construction
- Enclosure: Typically made of galvanized or stainless steel with IP44–IP65 protection, providing resistance to rain, dust, lightning, and electromagnetic interference .
- Compartments: Separate rooms for metering, isolation switches, feeder switches, and reactive power compensation ensure safety and ease of maintenance.
- Cable Entry/Exit: Side or bottom cable entry with waterproof elbows and epoxy sealing ensures safe and reliable wiring .
- Installation: Designed for outdoor pole or pad-mounted installation, with lifting rings for easy handling and commissioning .
Advantages
- Compact and Space-Saving: Integrates multiple functions in a single cabinet, reducing footprint and installation complexity.
- Enhanced Safety: Enclosed design protects personnel and equipment from environmental hazards and unauthorized access.
- Low Maintenance: Factory-assembled and sealed, minimizing wear and tear and extending service life.
- Flexibility: Can be customized for different transformer capacities, reactive power compensation, and monitoring requirements .
Applications
- Urban and rural low-voltage distribution networks
- Industrial and mining enterprises
- Street lighting and residential communities
- Substations requiring compact, multifunctional low-voltage solutions In summary, under-the-transformer integrated distribution boxes provide a reliable, compact, and multifunctional solution for low-voltage power distribution, combining safety, monitoring, and efficiency in a single unit, making them ideal for modern power grids and urban infrastructure .
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