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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Related Knowledges
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Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026 -
What’s the Difference Between Rectifier Transformers and Power Transformers?What is a Rectifier Transformer?"Power conversion" is a general term encompassing rectification, inversion, and frequency conversion, with rectification being the most widely used among them. Rectifier equipment converts input AC power into DC output through rectification and filtering. A rectifier transformer serves as the power supply transformer for such rectifier equipment. In industrial applications, most DC power supplies are obtained by combining a rectifier transformer with rectifier equ01/29/2026
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