3 to 800kV MCOV Arresters
| Brand | ROCKWILL |
| Model NO. | Arresters |
| Rated voltage | 6kV |
| Series | EGLA |
We manufactures a wide range of line surge arresters to meet each application’s unique requirements. All surge arresters are qualified to the latest version of IEEE C62.11 or IEC 60099-4. The EGLA product line is qualified to the latest version of IEC 60099-8. Lightweight, easy to handle polymer arresters are exclusively used for all Hubbell line arrester applications. Several design types are available to meet varying isokeraunic levels and mechanical requirements for each client’s specific needs. Hubbell line surge arresters are installed in various environments across the world and continue to improve system reliability.
This web listing represents a sampling of typical configurations. ProtectaLite Arrester assemblies can be customized for all distribution and transmission lines.Selection of arrester MCOV size is based upon the maximum continuous voltage that is applied across the arrester in service (line-to-ground). For arresters on effectively grounded neutral systems, this is normally the maximum line-to-ground voltageExample: 84 kV on a 138 kV system. For ungrounded or impedance-grounded systems, the MCOV should be at least 90 percent of maximum phase-to-phase voltage.For more information about arrester selection, please contact your Hubbell Power Systems representative.
Externally gapped transmission line arrester to improve system performance and reduce interruptions
Eliminate lightning interruptions with Protecta*Lite Arresters
Custom designs available up to 765 kV
Protecta*Lite Arresters offer protection on both shielded and unshielded lines
Technology parameters
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KGC-1189Desktop Dissolved Gas Analysis Analyzer
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750kV Series Porcelain-Housed Metal Oxide Surge Arreste
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1000kV Series Porcelain-Housed Metal Oxide Surge Arresters
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6 - 220kV Post - type Composite - Housed Metal Oxide Surge Arresters
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330 - 1000kV Composite - Housed Metal Oxide Surge Arresters
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35 - 220kV Suspended Composite - Housed Metal Oxide Surge Arresters
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110 - 500kV Composite-Housed Line Surge Arresters
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Tank-type Metal Oxide Surge Arresters for GIS
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±500～±1100kV DC Metal Oxide Surge Arresters
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Metal Oxide Surge Arresters for Series Compensation Capacitors
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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,16/08-2025 -
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 represented16/08-2025 -
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 di16/08-2025 -
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 fix16/08-2025 -
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, thei16/08-2025 -
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 sud16/08-2025
