| Brand | ROCKWILL |
| Model NO. | 2000KVA 1600KVA 11KV 13.2KV 13.8KV Pad-Mounted Transformers |
| Rated voltage | 11kV |
| Series | ZGS |
Product Description
Rockwill's pad-mounted transformers are engineered for superior performance across a comprehensive power range from 75 kVA to 5000 kVA. Our units incorporate integrated high-voltage fuses and switches for complete circuit protection, featuring innovative elbow connector technology that enables safe live-line connections and maintenance operations using hot sticks. Designed for reliability, all transformers undergo rigorous testing and comply with leading industry standards including CSA, ANSI C57, DOE, and IEEE requirements.
The ZGS11-H(Z) series represents our next-generation combined transformer solution, offering an optimized compact design that delivers exceptional space efficiency without compromising performance. These units are specifically engineered for urban load center applications, providing enhanced power distribution efficiency and improved supply quality.
Key Features & Benefits
Advanced Safety System
Fully sealed, oil-filled construction with complete insulation
Integrated high-voltage protection with visible break switches
Tamper-resistant enclosure with secure locking mechanism
Network Flexibility
Dual-mode operation for both loop and radial feed configurations
Plug-and-play cable connection system
Compatible with SCADA and smart grid applications
Premium Performance
Ultra-low no-load and load losses (meets DOE 2016 efficiency standards)
Acoustic noise levels below NEMA standards
150% overload capacity for emergency operation
Robust Construction
Military-grade corrosion protection (ASTM B117 salt spray tested)
-40°C to +50°C operational temperature range
Seismic-rated design (Zone 4 compliance)
Smart Ready Design
Built-in monitoring points for IoT integration
Optional remote temperature and load monitoring
Predictive maintenance capability
Typical Applications
• Urban distribution network upgrades and expansions
• High-density residential and commercial developments
• Critical infrastructure power systems (hospitals, data centers)
• Industrial parks and manufacturing facilities
• Renewable energy interconnection points
Parameters
Specification
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35kV On-Load / Off-Circuit Tap-Changing Oil-Immersed Power Transformer
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110kV Class oil-immersed transformer
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220kV Class oil-immersed transformer
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330kV Class oil-immersed transformer
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550kV Class oil-immersed transformer
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35kV Class oil-immersed transformer
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Single Phase Compact Oil Immersed Power Distribution Transformer
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1250kVA/20kV Electric Single Phase Oil Immersed Power Distribution Transformer
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JP-0.4kV Reactive metering integrated distribution cabinet for district transformer
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10kV Three-phase Oil-immersed Low-loss Energy-saving Distribution Transformer
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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 -
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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
