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End-to-End Power Project Solutions for the Global Energy Market

IEE Business provides end-to-end power project solutions for the global market — from financing and procurement to engineering, construction, and commissioning. We support utilities, developers, and industries with integrated services across renewable, thermal, and grid infrastructure projects, ensuring efficiency, compliance, and timely delivery worldwide.

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Engineering

Solutions for Frequent Tripping of Variable Frequency Drives (VFDs)
A Variable Frequency Drive (VFD) is a common electrical device used to regulate the speed and voltage of motors. However, we sometimes encounter the problem of frequent tripping of the VFD. This not only disrupts the normal operation of equipment but can also lead to production line shutdowns, causing unnecessary losses for the enterprise. So, how should we solve this problem?First, we need to understand the reasons behind frequent VFD tripping. Frequent tripping is usually caused by the followi
RW Energy
14yrs 30000+m² US$100,000,000+ China
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08/21/2025
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Engineering

Common Inverter Faults and Solutions
Overcurrent Fault​Overcurrent is one of the most frequent faults encountered during inverter operation. To better protect the inverter, multi-level protection against overcurrent is generally implemented. Based on the severity of the overcurrent, it can be categorized into the following situations: power module overcurrent, hardware overcurrent, and software overcurrent. Typically, power module overcurrent is the highest-level fault. The hardware overcurrent threshold is significantly lower than
RW Energy
14yrs 30000+m² US$100,000,000+ China
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08/21/2025
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Engineering

Interference Generated by Frequency Converters and Solutions
A frequency converter is a device used to adjust the speed and voltage of an electric motor by changing the motor's supply frequency to achieve speed control. However, during operation, frequency converters generate some interference that can negatively impact other electronic equipment and the power grid. Therefore, it's necessary to adopt solutions to mitigate this interference.​Electromagnetic Interference (EMI):​​ When adjusting the motor's supply frequency, frequency converters generate hig
RW Energy
14yrs 30000+m² US$100,000,000+ China
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08/21/2025
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Engineering

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, the
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

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
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

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 dist
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

SF6-Free Solution for Air-Insulated/Eco-friendly Gas Ring Main Units
Ⅰ. Technical Bottlenecks of SF₆ Substitution Insulation 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 fi
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

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
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

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 sudd
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/16/2025
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Engineering

Medium-Voltage Solid-Insulated Ring Main Unit Technology and Testing
1 IntroductionCommon insulation methods for 10kV medium-voltage ring main units (RMUs) include gas insulation, solid insulation, and air insulation.• Gas insulation typically uses SF₆ as the insulating medium. However, a single SF₆ molecule has a greenhouse effect 25,000 times greater than a CO₂ molecule, and SF₆ persists in the atmosphere for 3,400 years, posing significant environmental risks. Medium-voltage RMUs are widely distributed, making SF₆ recovery difficult and costly if hand
Rockwill
18yrs 500-1000 employees 108000m²+m² US$150,000,000+ China
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08/15/2025
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