Jiangsu Yawei Transformer Co.,Ltd. is one of the leading manufacturers and suppliers of dry-type grounding transformer reliable neutral grounding solution for power distribution and renewable energy systems in China. Please feel free to buy high quality dry-type grounding transformer reliable neutral grounding solution for power distribution and renewable energy systems from our factory. Customized orders are welcome.
Product Overview
A grounding transformer, also called an earthing transformer, is normally connected to a three-phase electrical system that does not provide a suitable neutral point. Its primary purpose is not conventional voltage transformation. Instead, it establishes a neutral point that allows the system to be grounded and provides a path for zero-sequence current during a single-line-to-ground fault.
The dry-type construction eliminates transformer oil and reduces the risk of oil leakage. The transformer can therefore be installed in electrical rooms, compact substations, renewable energy facilities, and other areas where environmental and fire-safety requirements are strict.
Depending on the project, the grounding transformer can be used together with a neutral grounding resistor (NGR) to control the magnitude of ground-fault current.
Typical System Configuration
Medium-Voltage Bus → Dry-Type Grounding Transformer → Neutral Grounding Resistor → Ground
During normal operation, the grounding transformer carries relatively little current. When a ground fault occurs, it provides a controlled zero-sequence current path, allowing the protection system to detect and isolate the fault.
Key Features
Dry-Type and Oil-Free Construction
The transformer uses dry insulation technology without insulating oil. This eliminates oil leakage and reduces fire-related risks, making the unit particularly suitable for indoor installations and densely populated electrical facilities.
The oil-free design also simplifies routine maintenance because there is no need for transformer oil sampling, oil replacement, or oil leakage inspection.
Reliable Neutral Point
The grounding transformer provides a stable neutral point for three-phase systems where a neutral is otherwise unavailable. This is especially useful in delta-connected and other ungrounded or impedance-grounded systems.
Controlled Ground-Fault Current
When combined with an NGR, the transformer can help limit ground-fault current to the required level. This reduces potential thermal and mechanical damage while giving protection equipment sufficient current to identify the fault.
Strong Insulation Performance
The dry-type insulation system provides reliable electrical isolation between the winding and grounded components. The insulation class and dielectric performance can be selected according to the system voltage and applicable standards.
Compact and Low Maintenance
The dry-type structure allows the transformer to be installed without an oil containment system. Its compact construction and relatively simple maintenance requirements make it suitable for substations, industrial plants, solar farms, and energy storage facilities.
Suitable for Renewable Energy Systems
Modern PV, wind, and BESS facilities often use power electronic converters and medium-voltage collector systems. A dry-type grounding transformer can provide the required neutral grounding point while fitting into compact electrical equipment layouts.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Dry-Type Grounding Transformer |
| Alternative Name | Dry-Type Earthing Transformer |
| Transformer Type | Dry Type |
| Phase | Three Phase |
| Rated Voltage | Customized according to system |
| Rated Capacity | Customized |
| Grounding Method | Direct / Resistor Grounded / Customized |
| Neutral | Available |
| Insulation Class | F / H or Customized |
| Cooling | AN / AF |
| Frequency | 50Hz / 60Hz |
| Enclosure | IP00 / IP20 / IP23 / Customized |
| Installation | Indoor / Outdoor |
| NGR Integration | Optional |
| Standards | IEC / IEEE / GB or Customer Specification |
Final technical parameters should be determined according to the electrical system configuration, grounding requirements, fault-current level, and project specifications.
Grounding Transformer with Neutral Grounding Resistor
For many medium-voltage systems, the dry-type grounding transformer works together with a neutral grounding resistor.
The grounding transformer establishes the neutral point, while the NGR controls the current flowing during a ground fault. This combination provides a practical solution for systems where limiting earth-fault current is required.
The NGR resistance is selected according to the desired grounding current and system voltage. The actual grounding design should be coordinated with the system's protection settings, insulation coordination, and fault-clearing requirements.
Applications
Photovoltaic Power Plants
Dry-type grounding transformers can be installed on the medium-voltage side of solar PV plants to provide a grounding point for the collector system. They can be coordinated with inverter transformers, MV switchgear, and grounding resistors.
Wind Farms
Wind power collection systems may require a dedicated grounding solution to provide a neutral reference and controlled ground-fault current. The dry-type grounding transformer can be integrated into the wind farm's medium-voltage substation.
Battery Energy Storage Systems
BESS installations use PCS equipment and medium-voltage transformers to connect battery systems to the grid. A grounding transformer can provide the required grounding path for the AC collection system and improve fault protection.
Industrial Facilities
Manufacturing plants, mining facilities, chemical plants, and other industrial installations can use grounding transformers to establish a neutral point and support reliable ground-fault protection.
Medium-Voltage Substations
The transformer can be installed in indoor or outdoor substations where the system requires an artificial neutral point without using an oil-filled transformer.
Main Components
| Component | Function |
|---|---|
| Iron Core | Provides the magnetic circuit |
| Grounding Winding | Creates the system neutral point |
| Insulation System | Provides electrical insulation |
| Neutral Terminal | Connects to grounding equipment |
| NGR Connection | Provides controlled fault-current path |
| Enclosure | Protects the transformer from external conditions |
| Temperature Monitoring | Monitors winding temperature |
| Cooling System | Dissipates operating heat |
Advantages of Dry-Type Grounding Transformer
| Feature | Benefit |
|---|---|
| Oil-Free Design | Lower fire and leakage risk |
| Neutral Point Creation | Provides a grounding reference |
| NGR Compatibility | Controls ground-fault current |
| Dry Insulation | Suitable for indoor applications |
| Low Maintenance | No transformer oil maintenance |
| Compact Construction | Easy integration into substations |
| Customizable | Adaptable to different grounding systems |
| Renewable Energy Compatible | Suitable for PV, wind, and BESS systems |
Why Choose Yawei Dry-Type Grounding Transformer?
Yawei Transformer provides customized dry-type grounding transformer solutions for medium-voltage power distribution, renewable energy, industrial, and utility applications.
The transformer can be engineered according to the required system voltage, grounding current, zero-sequence impedance, neutral grounding resistor, insulation level, enclosure protection, cooling method, and installation environment.
For EPC contractors, utilities, renewable energy developers, and industrial power users, a properly designed grounding transformer provides an important layer of electrical safety and helps ensure reliable ground-fault protection.
Contact Yawei Transformer for a customized dry-type grounding transformer solution for your project.
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