Single Phase Pole Mounted Electric Distribution Transformer 7.2 kV -34.5 kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Single Phase Pole Mounted Electric Distribution Transformer 7.2 kV -34.5 kV
Rated voltage	10kV
Rated frequency	50/60Hz
Rated capacity	25kVA
Series	D

Description

ROCKWILL single-phase hermetically sealed oil-immersed pole-mounted distribution transformers are designed and fully type-tested in accordance with the latest editions of IEC 60076 series (IEC 60076‑1:2011, IEC 60076‑2:2011, IEC 60076‑3:2013+AMD1:2018, IEC 60076‑4:2026, IEC 60076‑5:2006, IEC 60076‑7:2018), as well as North American standards IEEE C57.12.00-2021, IEEE C57.12.20-2025, IEEE C57.12.90-2021. The products are specially developed for outdoor overhead medium-voltage distribution networks, widely used for power supply in residential areas, commercial facilities, agriculture and light industry sectors.

Adopting CRGO grain-oriented silicon steel core and optimized winding layout, the transformer features low no-load & load loss and stable long-term operation performance. The fully hermetically sealed steel tank eliminates oil leakage fundamentally and realizes maintenance-free service under outdoor harsh environments for the whole service life. Domestic production complies with GB/T 6451-2015 and mandatory energy efficiency standard GB 20052-2024.

Standard Construction & Main Components

Hermetically sealed anti-corrosion welded steel tank
ONAN cooling radiators for natural oil circulation heat dissipation
High-creepage medium voltage bushings for overhead line connection
Galvanized pole-mount brackets and lifting lugs for convenient hoisting & installation
Pressure relief device, oil drain valve and oil level indicator
Optional accessories: fuse protection, surge arrester, temperature monitoring module
Winding conductor: copper / aluminium for selection

Technical Specifications

Item	Specification
Rated Primary Voltage	7.2 kV ~ 34.5 kV
Rated Capacity Range	10 kVA ~ 333 kVA
Cooling System	ONAN (Oil Natural Air Natural)
Core Material	CRGO grain-oriented silicon steel
Insulation Class	Class A
Rated Winding Temperature Rise	55 K
Tank Structure	Hermetically sealed leak-proof oil tank
Compliance Standards	IEC 60076, ISO 9001
Factory Test	Complete routine test before delivery

Standard Loss Data

Rated Capacity	No-load Loss (W)	Load Loss (W)
10 kVA	36	120
15 kVA	50	195
25 kVA	80	290
37.5 kVA	105	360
50 kVA	135	500
75 kVA	190	650
100 kVA	210	850
167 kVA	350	1410
333 kVA	Customized	Customized

Core Product Advantages

Low Energy Loss & High Efficiency：Low-loss CRGO core effectively reduces no-load loss, meets IEC energy efficiency requirements and cuts long-term grid operation costs.
Long Service Life & Low Maintenance：Hermetic oil tank prevents oil degradation and leakage; Class A heat-resistant insulation supports a 20-year design life with minimal maintenance work.
Strong Environmental Adaptability：Anti-corrosion tank coating and reliable outdoor insulation deliver stable performance under high humidity, salt spray and tropical climates.
Safe Operation Performance：Fitted with standard safety components including pressure relief valve and oil level gauge; optional overvoltage & short-circuit protection improves grid safety.
Wide Global Compatibility：Customizable voltage ratios, winding materials and auxiliary parts, compatible with 50Hz IEC and 60Hz North American distribution grids.
Easy Installation & Transportation：Integrated pole-mount brackets and heavy-duty lifting lugs simplify field hoisting and pole installation work.

Application Scope

Urban and rural overhead medium-voltage distribution feeders
Residential zones, street lighting and small commercial loads
Farm irrigation equipment and small agricultural processing plants
Matching power supply for distributed photovoltaic & wind power stations
Old distribution transformer replacement & grid renovation projects

Documentation Resource Library Distribution Transformer

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Rockwill Electric Group Profile

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English

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Rockwill Electric Group Profile

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