H59 H61 13.2kV 13.8kV 15kV 33kV Oil Immersed Power Distribution Transformer Manufacturer
Key attributes
| Brand | Rockwell |
| Model NO. | H59 H61 13.2kV 13.8kV 15kV 33kV Oil Immersed Power Distribution Transformer Manufacturer |
| Rated voltage | 11kV |
| Rated frequency | 50/60Hz |
| Rated capacity | 2000kVA |
| Series | S |
Product descriptions from the supplier
Product Description
H59/H61 Series Oil-Immersed Distribution Transformers are high-efficiency, energy-saving transformers specifically designed for medium-voltage distribution networks. Covering voltage classes from 13.2kV to 33kV, these units feature a fully sealed oil-immersed construction suitable for both indoor and outdoor installations in diverse and challenging environments. Through optimized magnetic circuit design and cooling systems, the product series delivers low loss, low noise, and high reliability, making it widely applicable in industrial power supply, commercial complexes, renewable energy plants, and urban grid systems.
Distribution Transformer
1. Capacity: 10 up to 3150kVA
2. High Voltage: 3.3kV up to 33kV
4. Connection Method: Optional
Exporting to oversea with very successful experience.
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.
| Rated capacity kVA | Voltage combination | NO-load loss W | Load loss W | No-load current % |
Short-circuit Impedance |
|||
| HV (KV ) | HV tapping range | LV (KV) | Connection symbol | |||||
| 30 | 6.3kV 10.5kV 11kV 13.2kV 13.8kV 15kV |
±2×2.5% ±5% |
0.4 | Dyn11 or Yyn0 | 90 | 660 | 2.1 | 5.5 |
| 50 | 130 | 960 | 2.0 | |||||
| 63 | 150 | 1145 | 1.9 | |||||
| 80 | 180 | 1370 | 1.8 | |||||
| 100 | 200 | 1650 | 1.6 | |||||
| 125 | 240 | 1980 | 1.5 | |||||
| 160 | 290 | 2420 | 1.4 | |||||
| 200 | 330 | 2860 | 1.3 | |||||
| 250 | 400 | 3350 | 1.2 | |||||
| 315 | 480 | 4010 | 1.1 | |||||
| 400 | 570 | 4730 | 1.0 | |||||
| 500 | 680 | 5660 | 1.0 | |||||
| 630 | 810 | 6820 | 0.9 | 6 | ||||
| 800 | 980 | 8250 | 0.8 | |||||
| 1000 | 1150 | 11330 | 0.7 | |||||
| 1250 | 1350 | 13200 | 0.7 | |||||
| 1600 | 1630 | 15950 | 0.6 | |||||
| 2000 | 1950 | 19140 | 0.6 | |||||
| 2500 | 2340 | 22200 | 0.6 | |||||
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.
For material selection: Choose H61 if your project involves high voltage (≥33kV), large current (≥630A), or harsh environments (high humidity/coastal areas) — its superior conductivity and corrosion resistance reduce operational risks. H59 is cost-effective for medium-low voltage (≤15kV) and small-to-medium load scenarios (e.g., residential communities, small factories) where performance requirements are moderate.
Both H59 and H61 are common brass materials used for conductive components of transformers, with the core difference lying in their copper-zinc content: H61 contains 60%-63% copper, offering superior electrical conductivity and corrosion resistance, making it suitable for high-voltage and high-current scenarios; H59 contains 57%-60% copper, featuring lower cost and meeting regular power supply requirements. Voltage models correspond to different power grid adaptations: 13.2kV/13.8kV/15kV are suitable for medium and low-voltage distribution networks, such as power supply for industrial parks and residential communities; 33kV is designed for high-voltage power transmission scenarios, adapting to backbone lines of regional power grids. Selection should match the local grid voltage and load current.
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Related Knowledges
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How does the oil in oil-immersed power transformers clean itself?The self-cleaning mechanism of transformer oil is typically achieved through the following methods: Oil Purifier FiltrationOil purifiers are common purification devices in transformers, filled with adsorbents such as silica gel or activated alumina. During transformer operation, convection caused by oil temperature changes drives the oil to flow downward through the purifier. Moisture, acidic substances, and oxidation byproducts in the oil are absorbed by the adsorbent, thereby maintaining oil c12/06/2025 -
Avoid H59 Transformer Failure with Proper Inspection & CareMeasures to Prevent H59 Oil Immersed Power Distribution Transformer from Burning OutIn power systems, H59 Oil Immersed Power Distribution Transformer play an extremely critical role. Once burned out, they can cause widespread power outages, directly or indirectly affecting the production and daily lives of a large number of electricity users. Based on the analysis of multiple transformer burnout incidents, the author believes that a considerable number of such failures could have been avoided or12/06/2025 -
Top Causes of H59 Distribution Transformer Failure1. OverloadFirst, with the improvement of people's living standards, electricity consumption has generally increased rapidly. The original H59 distribution transformers have small capacity—“a small horse pulling a big cart”—and cannot meet user demands, causing the transformers to operate under overload conditions. Second, seasonal variations and extreme weather conditions lead to peak electricity demand, further causing H59 distribution transformers to run overloaded.Due to long-term overload o12/06/2025 -
How to Select H61 Distribution Transformers？H61 Distribution Transformer Selection includes the selection of transformer capacity, model type, and installation location.1.Selection of H61 Distribution Transformer CapacityThe capacity of H61 distribution transformers should be selected based on the current conditions and development trends of the area. If the capacity is too large, it results in the “large horse pulling a small cart” phenomenon—low transformer utilization and increased no-load losses. If the capacity is too small, the tran12/06/2025 -
Can the secondary neutral of a control transformer be grounded?Grounding the secondary neutral of a control transformer is a complex topic involving multiple aspects such as electrical safety, system design, and maintenance.Reasons for Grounding the Secondary Neutral of a Control Transformer Safety considerations: Grounding provides a safe path for current to flow to earth in the event of a fault—such as insulation failure or overload—instead of passing through the human body or other conductive paths, thereby reducing the risk of electric shock. System sta12/05/2025 -
Wiring Methods and Parameters of Grounding TransformersGrounding Transformer Winding ConfigurationsGrounding transformers are classified by winding connection into two types: ZNyn (zigzag) or YNd. Their neutral points can be connected to an arc suppression coil or a grounding resistor. Currently, the zigzag (Z-type) grounding transformer connected via an arc suppression coil or a low-value resistor is more commonly used.1. Z-Type Grounding TransformerZ-type grounding transformers come in both oil-immersed and dry-type insulation versions. Among them12/05/2025
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Localized Production and Strategic Collaboration Implementation Plan for Oil-Immersed Distribution Transformers in AfricaWenzhou Rockwell Transformer Co., Ltd. distributes power transformers to multiple African countries including Tanzania, Zambia, Rwanda, Ethiopia, Togo, Cameroon, and Malawi. With in-depth knowledge of local policies, we propose a collaborative plan to establish a manufacturing facility for oil-immersed distribution transformers and seek partnerships with qualified African entities.Ⅰ.Localized Production Strategy1. Market-Adaptive Capacity AllocationAlign production capacity with regional market04/23/2025
