Customization 6kV 10kV 20kV 22kV 33kV Oil-Immersed High-Voltage Side-Mounted Grounding Transformer source manufacturer
Key attributes
| Brand | Rockwell |
| Model NO. | Customization 6kV 10kV 20kV 22kV 33kV Oil-Immersed High-Voltage Side-Mounted Grounding Transformer source manufacturer |
| Rated voltage | 24kV |
| Rated frequency | 50/60Hz |
| Cooling mode | ONAN |
| Series | JDS |
Product descriptions from the supplier
Description
As the earliest specialized manufacturer of grounding transformers in China, we have built a complete independent industrial chain through decades of technological accumulation. Leveraging the long-term verified reliability of our products and our continuous innovation capabilities, we consistently lead the upgrading of industry standards, serving as a technological pioneer in the field of power safety equipment.
Earthing transformers are specially designed transformers. Their core function is to provide an artificial neutral point for power grids where the neutral point is either ungrounded or grounded through high impedance. This enables the neutral point to be grounded via an arc suppression coil or a small resistor.
The oil-immersed, high-voltage bushing side-mounted type grounding transformer (commonly referred to in the industry as the "high-voltage side-mounted grounding transformer") is a specialized variant. As the name implies, the high-voltage bushings (i.e., the terminals of the high-voltage winding) of this type of transformer adopt a side-mounted design, positioned on the side of the transformer tank rather than on the top.
This structural design significantly reduces the overall installation height of the equipment, making it particularly suitable for space-constrained installations, such as indoor GIS (Gas-Insulated Switchgear) rooms, compact substations, and retrofit projects in existing substations.
Features
Space Optimization: The side-exit bushings significantly reduce the overall equipment height, enabling easy adaptation to low-clearance spaces or retrofit requirements in existing substations, saving civil engineering costs.
Flexible Grounding: Provides a stable neutral point, allowing flexible connection to a resistor cabinet / arc suppression coil. This effectively limits ground fault current, suppresses overvoltages, and enhances system safety and power supply continuity.
High Reliability:
Impact Resistance: Designed to withstand the impact of unbalanced currents and zero-sequence currents generated by system single-phase-to-ground faults.
Low Losses: Employs high-quality silicon steel cores and advanced manufacturing processes to ensure low no-load and load losses.
Robust Insulation: Features a reliable high-voltage insulation structure with low partial discharge levels.
Excellent Protection: High enclosure protection rating (IP), providing effective dust and moisture resistance.Simplified Installation & Maintenance: Compact structure combined with the side-exit wiring design optimizes both on-site installation and subsequent maintenance operations.
Main Technical Parameters
Some of these earthing transformers cover voltage levels including：3.3kV / 6kV / 11kV / 15kV / 20kV / 22kV / 30kV / 33kV / 34.5kV / 36kV / 44kV / 66kV / 88kV / 110kV / 132kV / 145kV / 150kV / 220kV / 275kV / 330kV / 400kV, etc. The current withstand time ranges from 1s, 2s, 3s, 5s, 6s, 8s, 9s, 10s, 30s, 60s, 1hour to 2hours, and customization is available.
Parameter |
Specification |
Transformer type |
Earthing transformer |
Reference standard |
IEC 60076 |
Rated power |
334kVA |
Rated voltage |
6kV 10kV 20kV 22kV 33kV |
Number of phase |
3 |
Vector of group |
ZN |
Cooling method |
ONAN |
Winding material |
Copper |
Cooling medium |
Mineral oil |
Zero phase sequence impedance at 75℃ |
58.62 Ohms/phase |
Main Application Areas
Power Generation Systems: Neutral grounding for auxiliary power systems in thermal/nuclear/hydroelectric plants
New Energy Stations: Grounding protection for collection systems in photovoltaic/wind/storage power plants
Industrial Power Distribution: Grounding for high-voltage motors and distribution systems in petrochemical, metallurgical, and mining industries
Transportation Power Systems: Grounding for railway traction substations, metro main substations, and port shore power systems
Special Scenarios: Grounding systems for precision power supply in data centers, hospitals, and laboratories
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