| Brand | ROCKWILL |
| Model NO. | SC Series Dry-Type Transformer |
| Rated capacity | 400kVA |
| Primary voltage | 35kV |
| Secondary voltage | 0.4kV |
| Series | SC Series |
Overview
Dry-type transformers are versatile medium-voltage power distribution transformers that are essential for applications where safety, environmental concerns, and reliability are paramount. They are commonly used in commercial, industrial, healthcare, and public infrastructure settings, and other special applications. Their ability to operate without liquid coolants makes them ideal for indoor and sensitive environments.
Safe & Eco-friendly: Fireproof, non-polluting, and safe for direct operation at the load center.
Compact Design: Easy to install and service, providing low-noise and long lasting operation.
Enhanced Performance: Advanced heat dissipation with forced air cooling enhancing operational capacity.
Superior Durability: Engineered for both indoor and outdoor applications; minimal maintenance needed due to rugged construction.
Operating condition
1.working temperature：-5℃~40℃
2.Relative humidity: ＜95% (25℃)
3.In the ambient, there should not has the gas that corroding metal, destroying insulation. The transformer should not be corroded by water, rain or snow.
4.Altitude: ＜2000m
If you need to know about more parameters , Please check the model selection manual.↓↓↓
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Design Solution of 24kV Dry Air Insulated Ring Main UnitThe combination of Solid Insulation Assist + Dry Air Insulation represents the development direction for 24kV RMUs. By balancing insulation requirements with compactness and employing solid auxiliary insulation, insulation tests can be passed without significantly increasing phase-to-phase and phase-to-ground dimensions. Encapsulating the pole column solidifies the insulation for the vacuum interrupter and its connecting conductors.Maintaining the 24kV outgoing busbar phase spacing at 110mm,Rockwill16/08-2025 -
Optimization Design Scheme for the 12kV Air-Insulated Ring Main Unit Isolating Gap to Reduce Breakdown Discharge ProbabilityWith the rapid development of the power industry, the ecological concept of low-carbon, energy-saving, and environmental protection has been deeply integrated into the design and manufacturing of power supply and distribution electrical products. The Ring Main Unit (RMU) is a key electrical device in distribution networks. Safety, environmental protection, operational reliability, energy efficiency, and economy are inevitable trends in its development. Traditional RMUs are primarily representedRockwill16/08-2025 -
Analysis of Common Problems in 10kV Gas-Insulated Ring Main Units (RMUs)Introduction:10kV gas-insulated RMUs are widely used due to their numerous advantages, such as being fully enclosed, possessing high insulation performance, requiring no maintenance, having a compact size, and offering flexible and convenient installation. At this stage, they have gradually become a critical node in urban distribution network ring-main power supply and play a significant role in the power distribution system. Problems within gas-insulated RMUs can severely impact the entire diRockwill16/08-2025 -
SF₆-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main UnitsⅠ. Technical Bottlenecks of SF₆ SubstitutionInsulation Medium Performance Gapo Dried Air/N₂ insulation strength is only 1/3 of SF₆, requiring expansion of contact gap from 60mm to ≥150mm.o Conventional spring mechanisms lack energy to drive rapid closure of large gaps, easily causing contact ablation due to pre-strike.o Synthetic gases (e.g., C4+CO₂) decompose under arcing, leading to irreversible insulation degradation.Mechanical Structural Limitationso National Grid standardization fixRockwill16/08-2025 -
Implementation Scheme for Installing Lightning Arresters or Voltage Transformers in Gas-Insulated Ring Main UnitsAccording to insulation type, ring main units (RMUs) can be categorized as gas-insulated or air-insulated. The former installs primary circuit components in a sealed metal enclosure filled with low-pressure gas (primarily SF₆ or mixed gases) as the insulating medium, using cable terminals for incoming and outgoing lines. Due to superior insulation, compact size, and modular design, they are widely used in 10kV outdoor distribution substations and prefabricated transformer stations. However, theiRockwill16/08-2025 -
Pressure Relief Safety Solution for Gas-Insulated Ring Main UnitsⅠ. Problem ContextAs a core component in urban power distribution networks, ring main units (RMUs) are widely used in residential areas, factories, and public buildings due to their compact structure, low cost, and high reliability. However, internal equipment failures or arc faults may generate high-temperature, high-pressure gas, leading to cabinet explosions that endanger personnel and equipment. While traditional sealed designs maintain insulation integrity, they fail to rapidly release sudRockwill16/08-2025
