1. Rated voltage:
High voltage side: 12kV (or 10kV)
Low voltage side: 0.4kV / 0.23kV
Rated frequency: 50Hz

2. Transformer parameters:
Capacity range: common 200kVA ~ 1600kVA (maximum up to 2500kVA)
Type:
Oil-immersed transformer: S11, S13, S20, etc. (in line with GB 20052 energy efficiency standard)
Dry-type transformer: SCB10, SCB12, SCB13, SCB14 (epoxy resin casting, good fire resistance)
Voltage regulation mode: no-excitation voltage regulation (±2×2.5% or ±5%)
Connection group: Dyn11 (commonly used) or Yyn0

3. Parameters of high-voltage unit (H unit):
Rated current of main circuit: 630A, 1250A
Rated short-circuit breaking current (load switch): 20kA, 25kA
Rated short-circuit making current: 50kA, 63kA
Fuse protection circuit (-F): ≤125A/200A (with current-limiting fuse)
Insulation medium: SF₆ gas (mainstream) or air insulation
Main switch type: three-position load switch (fixed, such as XGN15/HXGN type)

4. Parameters of low-voltage unit (L unit):
Rated current of main circuit: 400A ~ 4000A (selected according to transformer capacity)
Main switch type: frame circuit breaker (ACB) or molded case circuit breaker (MCCB)
Rated short-time withstand current (Icw): 30kA ~ 65kA (1s)
Number of outgoing line circuits: 4 ~ 16 circuits (customizable)
Compensation capacitor: Optional dynamic reactive power compensation device (capacity customized on demand)

5. Protection level:
Overall shell: IP23D/IP34D (anti-≥2.5mm solid/anti-water/anti-foreign object contact)
After the high-voltage room/low-voltage room door is opened: IP2X (anti-≥12.5mm solid)

6. Temperature rise and heat dissipation:
Transformer room: natural ventilation or forced heat dissipation (fan)
High and low voltage rooms: natural convection or temperature-controlled fan
Allowable temperature rise: In line with GB/T 17467 standard (such as oil temperature of top layer of oil transformer ≤55K)

7. Environmental adaptability:
Ambient temperature: -25℃ ~ +40℃ (-40℃ for special design)
Altitude: ≤1000m (>1000m requires derating)
Humidity: Daily average ≤95%, monthly average ≤90%

High integration: High voltage, transformer, and low voltage are integrated to save space (50%+ less than civil engineering stations).

Factory prefabrication: Standardized production, controllable quality, and quick on-site installation (1~3 days to put into operation).

Flexible power supply: Supports multiple solutions such as ring network, dual power supply, and terminal power supply.

Safe and reliable: "Five-protection" interlocking, fully enclosed insulation, and multiple protection design.

Strong scalability: Modular structure, low-voltage circuits can be increased or decreased as needed.

Low maintenance cost: SF₆ switches are maintenance-free, and the box life is >20 years.

Strong adaptability: Universal for indoor and outdoor use (IP34D), resistant to wind and sand, and corrosion.