Transformers
Earth Transformer
Enhance system safety and stability with our specialized Earth Transformers. Crucial for creating an artificial neutral point in ungrounded delta systems or for providing a low-impedance path to ground, these transformers ensure fault current management and overvoltage protection. Our Earthing Transformers are typically zigzag-connected or star-delta connected (with a grounding resistor), designed to handle temporary fault currents without damage. They offer superior voltage stability, fault current limitation, and reliable system grounding, essential for safeguarding electrical equipment and personnel in industrial, utility, and mining applications. Trust our robust solutions for critical grid protection.
Earthing Transformer
The Earthing transformer complies with ANSI, CSA, NEMA, IEEE, IEC, GB standards. NPC ELECTRIC manufactures Earth transformers in strict accordance with the highest industry and international standards. Our team of highly skilled professionals ensures these rigorous standards are meticulously upheld in daily operations.
33kV 600A Neutral Zig-zag Grounding Reactor Transformer
The 33kV 600A Neutral Zig-zag Grounding Reactor Transformer is a high-performance grounding solution designed to meet the strict requirements of IEC 60076-1, IEC 60076-5, IEC 60076-20, and GB/T 1094.6 standards, with oil quality tested according to ASTM D6871. This grounding transformer is engineered to provide effective neutral grounding, enhanced system stability, and fault current limitation in medium- and high-voltage networks. With a primary voltage of 33kV and 11432.0kVA rating, the transformer supports 100A power rating for 10 seconds, making it ideal for system grounding applications in substations, industrial facilities, and renewable energy projects. The ONAN cooling method provides efficient heat dissipation for continuous operation, while the use of high-grade mineral insulating oil ensures long-term performance and compliance with international safety standards.
500kVA 11kV Dry-Type Zigzag Grounding Transformer
The Dry-Type Zigzag Earthing/Grounding Transformer 500kVA 11kV is designed to provide an effective neutral grounding solution for medium-voltage power systems. By creating an artificial neutral point, the zigzag transformer limits earth fault currents, stabilizes system voltage, and enhances overall grid safety. Its zigzag winding configuration ensures balanced performance under normal operation while offering low zero-sequence impedance during ground faults. Featuring a dry-type insulation system, this transformer eliminates the risk of oil leakage and fire hazards, making it ideal for indoor substations and environmentally sensitive installations. The low-loss core design minimizes energy consumption and heat generation, ensuring high efficiency and long service life.
2000kVA 33kV Oil-Immersed Earthing Transformer with NGR
2000kVA 33kV Oil-Immersed Neutral Grounding Earthing Transformer with NGR is engineered to provide a stable and controlled neutral point for medium-voltage power systems. By combining an earthing transformer with an integrated Neutral Grounding Resistor (NGR), it effectively limits earth fault current, improves system protection coordination, and enhances operational safety. The oil-immersed design ensures excellent insulation performance, efficient heat dissipation, and long-term reliability under continuous operation. Optimized magnetic core construction reduces losses, while robust windings withstand short-time fault currents without mechanical degradation. The integrated NGR is precisely matched to system requirements, enabling accurate fault current limitation and minimizing damage to equipment during ground faults.
11kV 1500kVA Zigzag Wiring Earthing Transformer with NGR High Impedance
11kV 1500kVA Zigzag Wiring Earthing Transformer with NGR (High Impedance) is designed to provide a reliable artificial neutral point for medium-voltage power systems where controlled earth fault current is required. Utilizing a zigzag winding configuration, the transformer offers low zero-sequence impedance while maintaining balanced operation during normal conditions. The integrated high-impedance Neutral Grounding Resistor (NGR) effectively limits ground fault current, reducing thermal and mechanical stress on network equipment. This transformer is engineered for stable performance, high fault withstand capability, and long operational life. The robust insulation system and reinforced windings ensure safe operation under fault conditions, while the optimized core design minimizes losses.
Zigzag Neutral Grounding Transformer to IEC Standards – Factory Direct Sales
Zigzag Neutral Grounding Transformer manufactured to IEC standards is a reliable solution for establishing an artificial neutral point in medium-voltage power systems. Designed with a precision zigzag winding configuration, it provides low zero-sequence impedance during ground faults while maintaining balanced operation under normal conditions. This enables effective limitation of earth fault currents, improved system protection coordination, and enhanced grid safety. Produced under strict IEC compliance, the transformer features a robust core design, high-quality conductors, and reinforced insulation systems to ensure long-term stability and fault withstand capability. Factory direct sales allow for flexible engineering support, competitive pricing, and shorter delivery cycles.In-Depth Analysis
Earthing transformers are built to deliver high efficiency, reliable performance, and advanced safety, helping businesses reduce energy costs while ensuring stable power supply. With future-ready adaptability for renewable energy and smart grid applications.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, transformers exhibit lower losses and higher efficiency across the entire load range.
Load Efficiency Comparison(%)
No-load Loss Comparison(W)
High-efficiency Core Design
High magnetic permeability and low loss silicon steel sheets are used and processed by special process to reduce hysteresis loss and eddy current loss and improve conversion efficiency.
Improved Magnetic Permeability
+30%
Reduced Iron Loss
-35%
Multiple Protection Systems
IP65 protection grade design combines multiple protection measures such as anti-corrosion, anti-UV, anti-condensation and anti-small animal intrusion.
Waterproof Performance
IP65
Anti-Corrosion Ability
15 years+
Ultra-low Noise Technology
A special shock-absorbing structure, low-noise fans, and optimized heat dissipation design ensure operating noise is far below industry standards.
Noise Reduction
-15dB
Suitability for Residential Areas
Excellent
Intelligent Cooling System
The heat dissipation system with adaptive temperature control automatically adjusts the heat dissipation efficiency according to the load and ambient temperature to reduce energy consumption.
Heat Dissipation Efficiency
+40%
Temperature Stability
±2℃
Safety Wiring System
Insulated protective cover and anti-misoperation design ensure personnel safety during installation and maintenance and reduce accident risks
Insulation Grade
Class H
Safety Protection
IP2X
Intelligent Monitoring
An optional remote monitoring system is available to monitor operating status, temperature, load and other parameters in real time, and supports fault warning and remote diagnosis.
Data Collection Frequency
one times a minute
Fault Warning Accuracy
96%
Environmental Adaptability Analysis
Earthing transformers have been rigorously tested and can operate stably under various harsh environmental conditions.
Temperature Range
-40℃ ~ +55℃
Can work normally in extreme high and low temperature environments
Humidity Adaptation
0 ~ 100% RH
Including condensation environment, no frost requirement
Seismic Resistance Level
IEC 60068-2-57
Suitable for earthquake-prone areas
Altitude
≤3000m
More than special design
Why Choose Us
Discover why our earthing transformers are trusted worldwide for efficiency, safety, and reliability.
Earthing Transformers Manufacturer
NPC Electric is a trusted earthing transformers manufacturer providing reliable grounding solutions for safe and stable power systems. Our earthing transformers, including neutral grounding transformers and zig zag earthing transformers, are designed to limit fault currents and maintain proper system voltage balance in three phase power distribution networks. These transformers play a key role in ground fault protection and electrical safety, especially in isolated or ungrounded systems. Built to comply with IEC and IEEE standards, NPC Electric’s earthing transformers ensure durability, efficiency, and long service life under demanding operating conditions. As a leading manufacturer, we offer custom designs tailored to industrial, utility, and renewable energy applications worldwide.
Superior Ground Fault Protection
Our Earthing Transformers provide superior ground fault protection, serving as a critical safeguard for your electrical system. In ungrounded or high-impedance grounded networks, these transformers effectively create a stable neutral point, allowing for the precise detection and isolation of ground fault currents. This rapid fault clearing minimizes damage to equipment, prevents dangerous overvoltages, and significantly enhances operational safety for personnel. By deploying our reliable grounding transformers, you ensure robust protection against one of the most common and potentially destructive types of electrical faults, maintaining the integrity and continuous operation of your power distribution infrastructure.
Versatile Designs (Zigzag & Star-Delta)
We offer versatile designs for our Earthing Transformers, primarily utilizing Zigzag (interconnected star) or Star-Delta configurations to suit diverse system requirements. The Zigzag winding is particularly effective for creating a neutral point while drawing minimal fault current during normal operation, making it ideal for high-resistance grounded systems. Star-Delta connections offer flexibility for specific applications. Both types are robustly built, often oil-immersed, for reliable performance. This design flexibility ensures that our grounding transformers can be perfectly integrated into your unique power network, optimizing its protection and operational characteristics.
Long-Term Durability & Low Maintenance
Our Earthing Transformers are built for long-term durability and require low maintenance, ensuring reliable protection with minimal operational overhead. Constructed with high-quality core materials, robust windings, and durable tank designs (for oil-immersed units), they are engineered to withstand the thermal and mechanical stresses associated with fault currents and continuous duty. This resilient construction leads to an extended service life and reduces the need for frequent inspections or repairs. By investing in our durable earthing solutions, you secure a cost-effective and dependable component for enhancing the safety and longevity of your electrical infrastructure.
Product Show
Explore the detailed design and practical application scenarios of earthing transformers
Earthing Transformer Font View
transformer product font view show
Zig-zag Grounding Transformer
zig-zag transformer show
Earthing Transformer Producing
transformer is being produce
75kV Earthing Transformer
75kv transformer have done
Earthing Transformer Package box
transformer package box
Earthing Transformer External Information
transformer external accessories information
Grounding Transformer Load-bearing Test
transformer load-bearing test
Earthing Transformer Internal Operation
transformer internal operation show
Testing and Certification
Tested with precision and certified to meet international standards as
well as strict industry requirements.
Bare Cable Test Report
SGS Inspection Report
Certificate of Acceptance
ISO Quality Certificate
ISO Environmental Certificate
ISO Occupational Certificate
UL Laboratory Certificate
UL Product Certificate
Project Cases
Solar transformers have been successfully applied in many projects and have been highly praised by customers.
Dominican Residential Area
CompletedProvide stable and reliable power conversion solutions for the residential area to meet diverse production needs.
Country：Dominican
Model：75kVA Earthing Transformer x 3
Philippines Data Center
CompletedEnsure the power safety of surrounding residents and meet daily work needs
Country：Philippines
Model：220kVA Earthing Transformer x 4
USA Factory
CompletedNPC transformers provide safe, efficient, and reliable power distribution in the USA.
Country：USA
Model：450kVA Grounding Transformer x 4
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
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What is the rating of an earthing transformer?
The rating of an earthing transformer depends on the system voltage, fault current, and duration of fault. Typically, earthing transformers are rated from 5 kVA to several MVA, with voltage levels up to 36 kV or higher for industrial and utility applications. The continuous current rating defines how much neutral current the transformer can handle under normal conditions, while the short-time current rating determines its capacity during faults. NPC Electric designs earthing transformers customized to meet specific three phase system requirements, ensuring reliable fault current management and long-term stability. -
What does an earthing transformer do?
An earthing transformer provides a neutral point in three phase power systems where no direct neutral is available. It allows for the flow of zero-sequence currents during ground faults, maintaining voltage balance and protecting electrical equipment. Commonly used in delta-connected systems, the earthing transformer enhances electrical protection and enables the use of protective relays. Whether in industrial grids, substations, or renewable power plants, NPC Electric’s earthing transformers ensure stable grounding and fault control for safe and efficient power distribution. -
Why use a grounding transformer?
A grounding transformer is used to create a stable neutral point and manage ground fault currents in three phase systems. It prevents overvoltages, protects transformers and generators, and improves system reliability. In isolated or delta-connected networks, a grounding transformer helps detect and clear earth faults quickly. Using designs like zig zag or neutral grounding transformers, it provides controlled fault current paths, essential for power system protection. NPC Electric’s grounding transformers are engineered to meet IEC and IEEE standards, offering dependable performance in demanding industrial and utility environments. -
What are the different types of earthing transformers?
The main types of earthing transformers include the zig zag earthing transformer and the neutral grounding transformer. A zig zag transformer is widely used for its ability to handle zero-sequence currents efficiently without requiring an external resistor. The neutral grounding transformer, often connected with a resistor or reactor, limits the fault current during ground faults. Both designs are essential in three phase distribution networks, industrial substations, and renewable energy systems, ensuring proper ground fault protection and voltage stability. NPC Electric manufactures all types to global IEC and IEEE standards. -
What is the difference between a grounding transformer and an earthing transformer?
The terms grounding transformer and earthing transformer are often used interchangeably, but their application focus can differ slightly by region. In general, both serve the same purpose — providing a neutral point and path for ground fault currents in three phase power systems. “Grounding transformer” is more common in North America, while “earthing transformer” is used internationally. Both may use zig zag or wye-delta configurations to control fault currents, stabilize voltages, and enhance system safety. NPC Electric supplies both types, ensuring reliable electrical protection and compliance with global standards.
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