Three Phase Pad Mounted Transformer
Primary Voltage: 6kV, 12kV, 24kV, 35KV, 36.75kV, 38.5kV (customized)
Secondary Voltage: 0.27kV, 0.315kV, 0.4kV, 0.69kV, 1.14Kv (customized)
Rated Frequency: 50Hz, 60Hz
Phases: 3 phase
Vector Group: Dyn11, Yd11 (customized)
Protection Level: Oil tank IP68, high and low pressure chamber IP54, high pressure chamber door after opening IP3X
Zhejiang Tianrun Electric Co., Ltd. is one of the leading manufacturers and suppliers of three phase pad mounted transformer in China. We are committed to providing high quality customized products with competitive price. We warmly welcome you to buy bulk advanced three phase pad mounted transformer from our factory. Also, quotation is available.
Product Overview
This 2500kVA transformer features a wall-mounted structure with an integrated boost module. It steps up three-phase AC power from PV inverters to voltage levels such as 10kV and 35kV for on-site grid connection. The unit consists of three separate compartments: LV incoming cabinet, double-split transformer and HV outgoing cabinet. It supports flexible I-type and L-type layouts to suit various installation scenarios.
Core Features
Integrated Three-in-One Design
HV compartment, transformer compartment and LV compartment are assembled and pre-tested in factory within one enclosure.
Open Cooling with Low Temperature Rise
The radiator and core are exposed for natural convection cooling. Top oil temperature rise ≤60 K. It delivers low temperature rise and strong overload capacity under continuous heavy load, outperforming fully enclosed European-style units.
Separate Compartments for Safe & Easy Maintenance
Steel partitions isolate the three compartments, with all live parts fully sealed. Bottom manhole and outward-opening doors (>90°) allow independent compartment maintenance. Fuse or arc chute replacement does not require full feeder power cut-off.
Compact Footprint & Flexible Layout
Occupies over 60% less space than conventional civil substations. I-type or L-type layout options fit narrow or square sites. Integrated lifting lugs enable relocation and reuse of the whole unit.
Type Designation
Specification
Conventional Transformer Technical Parameters
|
Rated capacity (kVA) |
Rated voltage and tap range |
Vector group |
No load loss (kW) |
Load loss (kW) |
Impedance (%) |
||
|
High voltage (kV) |
Low voltage (kV) |
Tapping range |
|||||
|
Up to 12500 |
6, 12, 24, 35 |
0.4, 0.69, 1.14 |
±2×2.5 |
Yd11, Dyn11 |
Customized |
Customized |
6.5 |
High Voltage Vacuum Isolation Load Switch, Fuse Combination Electrical Technical Parameters
|
Items |
Parameter |
|
|
Model number |
FZRN25-12D (manual and electric operation) |
FZRN21C-40.5D (manual and electric operation) |
|
Rated-Voltage (kV) |
12 |
40.5 |
|
Power frequency withstand voltage (kV) |
45 |
95 |
|
Lightning impulse voltage (kV) |
75 |
185 |
|
Rated current (A) |
The fuse shall prevail |
The fuse shall prevail |
|
Rated short-time breaking current (kA) |
20/31.5 |
20/31.5 |
|
Mechanical life |
10000 times |
10000 times |
Environment
- The altitude: Not exceed 3000m
- The ambient air temperature: Not higher than +85℃, not lower than -40℃
- Outdoor wind speed: Does not exceed 35m/s
- Shock-proof: Horizontal acceleration 0.3m/s2; Vertical acceleration is not more than 0.15m/s2
- Pollution level: Ⅲ
- Installation location: Outdoor
- There is no explosive dangerous medium, and there is no place in the medium that is enough to corrode metal and destroy insulation gas and dust.
- Notes: If the above conditions of use can not be met, should be negotiated by the user and the manufacturer.
Application Scenarios
- PV Power Generation: Suitable for large ground-mounted power stations, mountainous projects, fishery-PV and agriculture-PV complementary projects.
- Wind Power Generation: The 0.69kV power output from wind turbines is stepped up to 35kV by this unit and connected to the wind farm collection lines, applicable for onshore and offshore wind farms.
- Battery Energy Storage System (BESS): AC power from PCS is boosted to 10kV/35kV for grid connection to realize peak shaving, frequency regulation, voltage support and backup power functions, covering generation-side, grid-side and user-side energy storage projects.
- Urban & Rural Distribution Network: Replaces conventional civil substations to supply power for residential areas, commercial complexes and municipal facilities.
- Industrial & Mining Enterprises: Can be used as workshop substations to meet high-reliability concentrated load demands of factories, mines, oil fields and ports.
- EV Charging Infrastructure: Fits charging and battery swap stations and supports high-power DC fast charging. Its integrated design saves land occupation and shortens construction periods.
- Data Centers & Infrastructure: Supplies power distribution for data centers, 5G base stations, rail transit, airports and ports. An optional automatic transfer switch ensures uninterrupted power supply.
FAQ
Q: What is a box-type transformer?
A: A factory-assembled compact unit that combines HV switchgear, a transformer, and LV switchgear inside one weatherproof steel enclosure, ready for on-site installation.
Q: What are the main types?
A: Three types - European-style (fully enclosed), American-style (tank-integrated), and Chinese-style/Huabian (exposed radiators, independent compartments).
Q: What are its key advantages?
A: Small footprint, fast installation, low cost, weatherproof, and easy maintenance compared with traditional civil-built substations.
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