I. Product Overview
Box-type substation (referred to as "box transformer" for short) is a kind of compact power transformation and distribution equipment which integrates high-voltage switchgear, distribution transformer, low-voltage distribution device and intelligent control system. It adopts modular design, has the characteristics of compact structure, convenient installation, high protection level and strong adaptability, and is widely used in power system, industry, new energy and urban construction.
1. Basic structure
Box substation is mainly composed of the following parts:
High-voltage unit: including high-voltage incoming cabinet, load switch, fuse, lightning arrester, etc., responsible for power input and high-voltage side protection.
Transformer unit: Dry or oil-immersed transformer is usually used for voltage grade conversion.
Low-voltage unit: including low-voltage switch cabinet, circuit breaker, metering device, capacitor compensation cabinet, etc., to realize power distribution and control.
Intelligent monitoring system (optional): integrate temperature control, remote monitoring, fault alarm and other functions to improve operation and maintenance efficiency.
Case shell: made of stainless steel, aluminum alloy or composite plate, with anticorrosion, dustproof, waterproof (IP23~IP54) and heat insulation performance.
2. Main types
According to the structure and application scenarios, box-type substations can be divided into:
European-style box transformer (pre-installed substation): independent compartments for high voltage, transformer and low voltage units, compact structure, suitable for urban power distribution.
American box transformer (combined substation): High-voltage and transformer integrated design, small size, low cost, common in industrial and mining enterprises.
Special box transformer for photovoltaic/wind power: it is suitable for new energy power station and has the characteristics of anti-backflow, harmonic suppression and high protection level.
Landscape box transformer: the shell can be customized and integrated with the urban environment, suitable for parks, commercial areas and other scenes.
Second, the core characteristics and advantages
Integrated design: reduce the workload of on-site installation and shorten the construction period.
Flexible deployment: mobile structure, suitable for temporary power consumption or places with frequent load changes.
High reliability: totally enclosed structure is moisture-proof and corrosion-proof, and it can adapt to the harsh environment of -40℃~+45℃.
Intelligent management: Support remote monitoring, data acquisition and fault diagnosis, and reduce operation and maintenance costs.
Energy saving and environmental protection: dry-type transformer has no oil leakage risk and low noise, which meets the requirements of green power grid.
Third, typical application scenarios
1. Urban distribution network
Residential quarter/commercial center: as the terminal distribution node, it ensures stable power supply.
Road lighting: provide compact power supply solution for street lamp system.
Emergency power supply: used in hospitals, data centers and other places that require high continuity of power supply.
2. Industrial field
Mine/oil field: explosion-proof box transformer adapts to flammable and dusty environment.
Factory power distribution: providing flexible power distribution and protection for production lines.
3. New energy power generation
Photovoltaic power station: step up and connect to the grid to match the inverter output (such as 35kV/0.4kV).
Wind farm: Resistant to salt fog, high humidity and other coastal or desert environments.
4. Rural power grid transformation
Replace the traditional civil substation and solve the power supply problem in remote areas.
Four, selection and operation and maintenance points
Selection basis:
Load capacity (such as 500kVA~2500kVA).
Environmental conditions (temperature, humidity, altitude).
Protection grade (IP34/IP54).
Intelligent requirements (whether remote monitoring is needed).
Operation and maintenance management:
Regularly check the temperature rise, insulation status and mechanical parts.
Using intelligent system to warn potential faults.
