HENTG POWER 33kV Earthing Transformer Oil Immersed Zig Zag Grounding Transformer for Solar Power Plants
HENTG POWER 33kV oil-immersed Zig Zag earthing transformer creates an artificial neutral for solar farms and MV grids. Features low zero-sequence impedance, NGR/arc suppression coil compatibility, optional 400V auxiliary winding, and IEC 60076 certification. Custom-engineered to your grounding study.
33kV earthing transformer
,oil immersed zig zag transformer
,grounding transformer for solar plants
The HENTG POWER 33kV Earthing Transformer is designed to build an artificial neutral point for three-phase medium-voltage power systems without available neutral connection. It is widely deployed in 33kV distribution networks, solar power plants, wind farms, industrial substations and renewable energy collector systems.
It provides a controlled zero-sequence current path during single-line-to-ground faults, enabling stable neutral grounding, earth fault protection and suppression of temporary overvoltage. This unit can be matched with Neutral Grounding Resistor (NGR) or Arc Suppression Coil (Petersen Coil) as per your network design. An optional 400V auxiliary winding is available to supply substation auxiliary loads, combining grounding and station service power supply in one single transformer.
Creates artificial neutral point for delta-connected three-phase systems. Supports resistance grounding or resonant grounding and coordinated earth fault protection schemes.
Low impedance for zero-sequence fault current while maintaining high impedance for balanced positive-sequence current. Works efficiently for grounding without acting as a regular power transformer under normal operation.
Connect with rated NGR to limit ground fault current. Fault current and duration are customized to match system protection and thermal withstand requirements.
For resonant grounded networks, it provides neutral access for arc suppression coil to compensate capacitive earth fault current and reduce sustained arcing fault risks.
Supply station auxiliary power: substation lighting, control panels, breaker operating mechanisms, ventilation & monitoring equipment.
Oil insulation & cooling design for medium voltage substation. Corrosion protection, oil type, cooling method and environmental adaptation can be customized for each project.
Under balanced three-phase supply, zig zag windings present high impedance to positive-sequence current. Only tiny excitation current flows when no auxiliary load is connected.
Zero-sequence current flows through the earthing transformer and matched neutral equipment. The special winding structure creates opposing zero-sequence flux, delivering low zero-sequence impedance to form the required fault path for protection action.
Important Note: Zero-sequence impedance, allowable grounding current and thermal withstand time are calculated by engineering, not fixed for all 33kV earthing transformers.
Utility-scale solar collector systems at 33kV busbar, to build grounding reference, control fault current and coordinate protection.
Work with NGR or arc suppression coil for wind farm collector feeders, enabling reliable fault detection and equipment protection.
Manage high cable earth capacitance and stabilize earth fault behaviour for city 33kV cable distribution grids.
Steel plants, chemical factories and mining sites with dedicated 33kV power networks, supporting sensitive earth fault protection.
Complete grounding package supply for overseas EPC projects, with custom drawings, test reports and export documentation.
| Parameter | Available Design / Requirement |
|---|---|
| Product Type | Oil Immersed Earthing Transformer |
| Rated System Voltage | 33kV |
| Winding Configuration | Zig Zag (Zn) |
| Rated Frequency | 50Hz / 60Hz |
| Neutral Grounding Method | NGR / Arc Suppression Coil |
| Ground Fault Current | Customized according to system study |
| Short-Time Duty | 10s / 30s / 2h or project-specific |
| Zero-Sequence Impedance | Engineered according to grounding requirements |
| Auxiliary Winding | Optional 400V |
| Auxiliary Winding Capacity | Customized according to continuous load |
| Cooling Method | ONAN or project-specific |
| Installation | Indoor / Outdoor, subject to design |
| Insulating Medium | Mineral Oil / Alternative Insulating Fluid upon request |
| Applicable Standards | IEC 60076 series / IEC 60076-6 |
| Environmental Requirements | Customized for altitude, temperature, humidity & corrosion |
Final ratings and configurations subject to project requirement and engineering confirmation.
Limits ground fault current to a fixed value. Widely used for industrial networks and renewable collector systems requiring selective, coordinated earth fault protection.
Compensates capacitive earth fault current of the grid. Applied for resonant grounded distribution systems to reduce arcing fault and improve power continuity.
HENTG POWER manufactures earthing transformers following the grounding scheme specified by EPC contractors, utilities or electrical consultants.
- Rated System Voltage: 33kV or other required voltage level
- System Frequency: 50Hz or 60Hz
- Grounding Method: NGR or Arc Suppression Coil
- Required Ground Fault Current (A)
- Fault Withstand Duration: 10s / 30s / 2h or custom duty
- Zero-Sequence Impedance requirement
- 400V auxiliary winding: Yes / No, plus load kVA rating
- Installation: Indoor / Outdoor, altitude, ambient temperature, corrosion class
- Applicable standards & utility specifications
- Custom zig zag winding design & oil immersed earthing transformer manufacturing
- Full solution for NGR and arc suppression coil grounding system
- Optional 400V station service auxiliary winding
- Project-tailored insulation and thermal design
- Supply technical drawings, calculation sheets and engineering datasheets
- Factory routine test, third-party witness inspection available
- Export packaging and global delivery for overseas power projects
A: It creates an artificial neutral point in three-phase systems without accessible neutral, to implement defined neutral grounding protection.
A: Earthing transformer is designed for neutral grounding path and fault withstand duty. Distribution transformer is for continuous power voltage conversion. Earthing transformer with auxiliary winding can serve both functions.
A: Yes. The zig zag transformer provides neutral connection for matched NGR. Resistance, fault rating and duration need coordination with protection system.
A: Yes, optional auxiliary winding can provide station service power, rated by your continuous load requirement.
A: Yes, widely used in renewable collector networks requiring artificial neutral grounding, subject to grid code and system design.
A: System voltage, frequency, grounding method, fault current, fault duration, auxiliary winding requirement and site installation conditions.
Send your specification, single line diagram (SLD) or grounding study document to our engineering team. We will prepare technical datasheet and commercial offer for your 33kV zig zag earthing transformer project.
info@hentgpower.comWebsite: www.hentgpower.com
-
Excellent SG-30KVA 220V To 380V Three-Phase Dry Type Auto Transformer
The SG-30KVA 220V to 380V Three-Phase Dry Type Autotransformer is a high-performance, energy-efficient solution designed for industrial and commercial applications. This transformer offers reliable voltage conversion from 220V to 380V, providing stable and consistent power
-
High Quality SG-80KVA 400/400V Three-Phase Isolation Dry Type Transformer Factory Price
The SG-80 400/400V Three-Phase Isolation Dry Type Transformer offers a reliable and efficient power solution for industrial and commercial applications. Designed with a dry-type isolation structure, it ensures maximum safety with no risk of oil leakage or fire hazards. The transf
