H61 30 kV 33kV 34.5kV 35 kV 46 kV 630kVA High Voltage Oil Immersed Distribution Transformer
Key attributes
| Brand | Rockwell |
| Model NO. | H61 30 kV 33kV 34.5kV 35 kV 46 kV 630kVA High Voltage Oil Immersed Distribution Transformer |
| Rated voltage | 33kV |
| Rated frequency | 50/60Hz |
| Rated capacity | 630kVA |
| Series | S |
Product descriptions from the supplier
Product Description
33/0.4kV Pole mounted High Voltage Oil Immersed Toroidal Power Transformer
The 33/0.4kV 630kVA high-voltage oil-immersed distribution transformer, constructed with H61 material, features precise specifications of 33kV high-voltage input and 0.4kV low-voltage output. It is suitable for medium and large load scenarios, serving as a core equipment for industrial and civil power distribution.
Adopting special insulating oil and Class H insulated windings, the transformer has an insulation resistance exceeding 1000MΩ. The oil-immersed natural circulation cooling system ensures the temperature remains stable within 85℃ under full load, making it adaptable to complex outdoor environments. Equipped with built-in overpressure and overtemperature alarm protection, it has a short-circuit withstand capacity of 25kA/2s. The IP54 protection rating combined with a corrosion-resistant housing effectively resists rain and dust erosion.
Widely used in industrial parks, commercial complexes and distribution network transformation projects, the transformer has passed IEC 60076 certification and authoritative type tests. With ten years of quality control guaranteeing a 20-year design service life, it supports OEM customization and provides a cost-effective solution for stable power distribution.
Distribution Transformer
1-Three phase oil immersed
2-Specialize in transformer for 10years
3-Authoritative Type Test Reports
4-OEM Service Offered
(I). Product Specification:
Frequency: 50Hz or 60Hz
Capacity: 5kVA ~630kVA
Primary Voltage: 2400~46, 000V
Secondary Voltage: 120~ 600V
Some of these earthing transformers cover voltage levels including：3.3 kV 5.5 kV 6 kV 6.6 kV 7.2 kV 10kV 10.5kV 11kV 13.2 kV 13.8 kV 15kV 17.5 kV 20 kV 22kV 24kV 30 kV 33kV 34.5kV 35 kV 46 kVetc. and customization is available.
Model NO. |
S9 |
Core |
Core-type Transformer |
Cooling Method |
Oil-immersed Type Transformer |
Winding Type |
Two-winding Transformer |
Certification |
ISO9001-2000, ISO9001, CCC |
Usage |
Power Transformer |
Frequency Characteristics |
Power Frequency |
Shape of Core |
Ring |
Brand |
Rockwell |
Color |
Gray, Green or Customized |
Transport Package |
Wooden Packing |
Specification |
IEC/ANSI/IEEE |
Trademark |
Rockwell |
Origin |
China |
HS Code |
8504330000 |
Production Capacity |
20000 |
Product Scope:
Meet or exceeds ANSI Standards
Robust construction having excellent short circuit and thermal withstand capabilities
ROCKWELL Transformers are more efficient by Reduced no-load losses and Reduced load losses
Customized to Specific Requirements
Three phase pole mounted type distribution transformer Features:
Three phase transformer with more economical cost
Pole Mounted type transformer for easy installation
Oil Filled type for Cooling Method
Three phase pole mounted transformer is used for power transmission and distribution, with low loss and high efficiency
This type Three phase pole mounted transformer is advanced design to increase short-circuit strength, thermal strength
Durable and corrosion resistant finish meets all ANSI/IEC/BS Standards for single phase pole mounted transformer.
ROCKWELL Three Phase Pole mout type Automated Deisgn System insures each customer's unique requirements are satisfied.
C. R. G. O Silicon Steel or Amorphous Metal is available for customer's option.
Type D16 Series OA Three-Phase Pole-mounted Transformer(CRGO Core BIL 150)
product Photo
Wenzhou Rockwell Transformer Co., Ltd. which is specialized in producing, developing and marketing power transmission and distribution products. The company is established in 2008, the subsidiary of ROCKWILL GROUP, which is located in Wenzhou city, Zhejiang province, China.
Our main products are including switchgear, ring main unit, transformer, load break switch, SF6/vacuum circuit breaker, substation, auto-recloser, voltage regulator, automatic sectionalizer, tap-changer, CT and PT etc.
Many of these products have the certification reports of the international authoritative KEMA Netherlands and CESI Italy.
We have a professional technical team which can provide you with full design solution and technical support.
Work shop
certificates
Team
Project
Shipping
Attention
The payment term: We accept TT,30% deposit and 70% balance against copy of BL.
The delivery time: Usually it will take about 15-20 days.
The standard of package: Usually use strong plywood case for protection.
The logo: If you have good quantity, it absolute no problem to do OEM.
Our market: our products are popular in Indonesia, Philippines, Russia, USA, Middle East and so on. Some of them are our regular customers and some of them are developing. We hope you can join us and make mutual benefit from our cooperation..
Warranty: in 12 month since BL date.
Our Service
quick response in before sales period help you got order.
excell ent service in production time let you know each step we made.
reliable quality solve you after sale headache.
long period quality warranty ensure you can buy without hesitate.
Why Choose ROCKWELL
One-stop supplier globally.
More than 10 years professional experiences in electrical appliance industry.
We offer professional online technology support for perfecting your electrical solution free.
Experienced sales service and suggestion.
All the products with accessories under strict quality control and final inspection before ship
We can assure the powerful competitive price and reliable quality products.
Most competitive shipping rate from our own shipping forwarder.
Warranty assurance: 12 month
Whatever big or small order, we can provide you one-to-one service.
1. How to Select H61 Distribution Transformer Capacity
- Select based on current conditions and development trends: Oversized capacity leads to the "big horse pulling small cart" phenomenon, resulting in low utilization rate and increased no-load losses. Undersized capacity causes overload operation, increasing losses and potentially leading to overheating or burnout in severe cases.
- Recommendation: Choose capacity rationally according to both normal load and peak load requirements of the installation area.
2. How to Select H61 Distribution Transformer Model Type
- Recommended to use new high-efficiency, energy-saving transformers that incorporate advanced materials, technologies, and manufacturing processes to reduce energy consumption.
- Amorphous alloy transformers: Reduce no-load losses by approximately 80% and no-load current by about 85% compared to traditional silicon steel core transformers. Particularly suitable for rural power grids or areas with very low load factors.
- Example: A three-phase five-limb oil-immersed amorphous alloy transformer (200 kVA) has a no-load loss of 0.12 kW and load loss of 2.6 kW; while an S9-type transformer of the same capacity has a no-load loss of 0.48 kW with identical load loss. This results in annual energy savings of 3,153.6 kW·h per transformer.
- Wound-core fully sealed distribution transformers: A new generation of low-noise, low-loss transformers with seamless core design that improves material utilization, reducing no-load losses by 7-10% and no-load current by 50-70%.
- On-load automatic capacity-adjusting transformers: Feature series-parallel winding connections with automatic controllers that adjust operating modes based on real-time load data. Especially suitable for applications with dispersed loads, strong seasonal variations, and low average load factors.
3. How to Select H61 Distribution Transformer Installation Location
- Install as close as possible to the load center to minimize supply radius—ideally within 500 meters. Even in areas with dispersed loads, the majority should remain within this range.
- Optimize layout while meeting site conditions and environmental requirements to improve efficiency and reduce line losses.
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