33kV Compact Outdoor Prefabricated Substation

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	33kV Compact Outdoor Prefabricated Substation
Rated voltage	33kV
Rated normal current	630A
Rated frequency	50Hz
Series	YB

Description

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.

Key Features

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

Technical Parameters

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

Service Environment

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

Applications

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.

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Model

YB-33

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