| Brand | ROCKWILL |
| Model NO. | 33kV Compact Outdoor Prefabricated Substation China manufacturer |
| Rated voltage | 33kV |
| Rated normal current | 630A |
| Rated frequency | 50Hz |
| Series | YB |
This Rockwill compact outdoor prefabricated substation integrates medium-voltage switchgear, a distribution transformer, and low-voltage distribution equipment within a single unitized enclosure. Designed for urban and rural distribution networks, it serves as a complete power transformation and distribution point suitable for neighborhood units, hotels, construction sites, and high-rise buildings.
The enclosure features a double-layer roof with foam-filled cavity for thermal insulation. The transformer compartment is equipped with an automatic temperature controller, heater, and cooling system. Independent access boards are provided for the HV and LV compartments for safe operation and maintenance.
Integrated unitized design ：Combines MV switchgear, transformer, and LV distribution in one factory-assembled enclosure
Multiple enclosure options： Available in aluminum alloy, stainless steel, composite steel plate, or non-metallic (glass fiber) materials
Flexible HV configuration ： Compatible with charge switches or vacuum circuit breakers
Transformer versatility：Supports oil-immersed, hermetically sealed, or dry-type transformers
Thermal insulation：Double-layer roof with foam-filled cavity reduces internal temperature rise
Automatic thermal management：Temperature-controlled heater and cooling system in the transformer compartment
Custom design ：Enclosure material, color, internal layout, and electrical configuration can be tailored to project requirements
| Parameter | Value |
|---|---|
| Rated voltage (HV) | 33 kV |
| Rated current (HV) | 630 A |
| Low voltage | 0.4 kV (400 V) |
| Frequency | 50 Hz |
| Transformer capacity | 50 – 2500 kVA |
| HV switchgear | Charge switch / Vacuum circuit breaker |
| Transformer type | Oil-immersed / Hermetically sealed / Dry-type |
| Enclosure materials | Aluminum alloy / Stainless steel / Composite steel / Glass fibre |
| Enclosure protection — HV/LV rooms | IP23 |
| Enclosure protection — Transformer (oil) | IP55 |
| Enclosure protection — Transformer (dry) | IP65 |
| Insulation level (33 kV) | 36 / 70 / 170 kV (Um / PF / LI) per IEC 60071-1 |
| Standards | IEC 62271-202, IEC 60076 |
| Certification | ISO 9001 |
| Parameter | Specification |
|---|---|
| Ambient temperature | –55 °C to +50 °C |
| Altitude | ≤ 2500 m above sea level |
| Humidity | Monthly average ≤ 95 %, daily average ≤ 90 % |
| Installation | Outdoor, on concrete foundation |
| Environmental conditions | No corrosive or flammable gas, no frequent violent vibration |
Neighborhood units and residential communities
Hotels, commercial complexes, and high-rise buildings
Large-scale construction sites and infrastructure projects
Urban and rural distribution network renovation
Industrial parks, mines, and oilfields
Remote or extreme-climate installations requiring wide temperature tolerance
Custom voltage ratings, transformer capacities, switchgear configurations, enclosure materials, and special environmental adaptations are available on request. Contact Rockwill for project-specific design and quotation.
Yes. The transformer compartment adopts double-layer foam-filled roof structure for heat insulation, fitted with automatic temperature controller, heater and cooling system. HV and LV compartments have independent access doors for maintenance.
Yes. Enclosure material, color, internal layout, electrical configuration and special environmental adaptation can all be customized to meet project requirements.
We can provide a warranty within 10 years. The warranty covers manufacturing defects under correct installation and normal operation. Extended warranty can be negotiated for specific projects.
Yes. Lifelong technical support is available after warranty expiry, and spare parts can be supplied at reasonable prices.
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