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Rockwill delivers integrated electrical solutions for smart grids, urban infrastructure, renewable integration, and industrial applications. From medium-voltage automation to EV charging networks and prefabricated substations, our systems ensure stable, efficient, and future-ready power distribution. Customized. Connected. Reliable.

CRCC Railway Project Contracting

Rockwill 04/01/2024

CRCC is one of the biggest railway construction groups in China and has taken part in the construction of almost all the domestic railway construction projects. The railways built solely by CRCC add up to exceed 34,000 kilometers, which accounts for more than 50% of the railways built after the founding of new China.

CRCC takes the lead domestically and even in the world in the construction level of bridges and tunnels, and it has built most major river and sea bridges as well as major large landmark tunnels in the country.

The Abuja-Kaduna Railway, Nigeria.png

The Abuja-Kaduna Railway, Nigeria

Nigeria Railway Modernization Project.png

Nigeria Railway Modernization Project

The Nacala Corridor Railway in Mozambique.png

The Nacala Corridor Railway in Mozambique

Recent Solutions

Design Solution of 24kV Dry Air Insulated Ring Main Unit

Design Solution of 24kV Dry Air Insulated Ring Main Unit

The 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,

Optimization Design Scheme for the 12kV Air-Insulated Ring Main Unit Isolating Gap to Reduce Breakdown Discharge Probability

Optimization Design Scheme for the 12kV Air-Insulated Ring Main Unit Isolating Gap to Reduce Breakdown Discharge Probability

With 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 represented

Analysis of Common Problems in 10kV Gas-Insulated Ring Main Units (RMUs)

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 di

SF6-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main Units

SF6-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main Units

Ⅰ. 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 fix

Implementation Scheme for Installing Lightning Arresters or Voltage Transformers in Gas-Insulated Ring Main Units

Implementation Scheme for Installing Lightning Arresters or Voltage Transformers in Gas-Insulated Ring Main Units

According 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, thei

Pressure Relief Safety Solution for Gas-Insulated Ring Main Units

Pressure Relief Safety Solution for Gas-Insulated Ring Main Units

Ⅰ. 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 sud

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