Outdoor Three Phase Pad-Mounted Transformer 11kV-35kV

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Key attributes

Brand	ROCKWILL
Model NO.	Outdoor Three Phase Pad-Mounted Transformer 11kV-35kV
Capacity	250kVA
Series	ZGS

Description

This Rockwill outdoor three-phase pad-mounted transformer is an American-style unitized substation integrating a transformer, switchgear, fuses, tap changers, low-voltage distribution devices, and auxiliary equipment within a fully sealed, oil-immersed tank. Designed for urban power distribution, it is suitable for industrial parks, residential areas, commercial centers, and high-rise buildings.

The transformer is hermetically sealed with a corrugated radiator for efficient cooling. The HV compartment integrates load switches and fuses in transformer oil, while the LV compartment supports energy metering, reactive power compensation, and low-voltage distribution. The enclosure is constructed from corrosion-resistant materials for reliable outdoor installation.

Key Features

Integrated American-style design： Combines transformer, HV switchgear, fuses, tap changer, and LV distribution in one sealed oil-filled tank
Fully sealed construction： Hermetically sealed corrugated tank prevents oil leakage and moisture ingress
Multiple voltage ratings ： Configurable for a wide range of standard HV voltages to suit global distribution networks
Comprehensive LV functionality ： Supports energy metering, reactive power compensation, and low-voltage distribution
Robust enclosure： Corrosion-resistant steel enclosure for long-term outdoor service
Dual-standard compliance :Designed to meet both IEC and ANSI/IEEE requirements for global markets
OEM/ODM available : Customized ratings, configurations, and enclosure designs available on request

Technical Parameters

Parameter	Value
Rated voltage (HV)	10 / 11 / 13.8 / 20 / 33 / 34.5 / 35 kV
Maximum operating voltage	38.5 kV
Low voltage	0.4 kV (400 V) / 0.69 kV (690 V)
Frequency	50 / 60 Hz
HV protection	Load switch + HV fuse (oil-immersed, plug-in type)
Transformer type	Oil-immersed, hermetically sealed
Tank cooling	Corrugated radiator (ONAN)
Enclosure material	Corrosion-resistant steel
Standards	IEC 60076, IEEE C57.12.00
Certification	ISO 9001

Service Environment

Parameter	Specification
Ambient temperature	–30 °C to +40 °C
Altitude	≤ 1,000 m above sea level
Installation	Outdoor, pad-mounted on concrete foundation
Enclosure	Weatherproof, corrosion-resistant, suitable for public areas

Applications

Industrial parks and commercial centers
Urban residential communities and high-rise buildings
Urban and rural distribution networks
Mining operations and oilfields
Infrastructure and construction projects

Custom voltage ratings, transformer capacities, configurations, and enclosure designs are available on request. Contact Rockwill for project-specific design and quotation.

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