20kV 44kV 145kV 150kV Three Phase Oil-Immersed Neutral Earthing Transformer Custom Factory
Key attributes
| Brand | ROCKWILL |
| Model NO. | 20kV 44kV 145kV 150kV Three Phase Oil-Immersed Neutral Earthing Transformer Custom Factory |
| Rated voltage | 20kV |
| Rated capacity | 100kVA |
| Phases | Three-phase |
| Series | JDS |
Product descriptions from the supplier
Product Overview
As a pioneer and the first professional original manufacturer in China's earthing transformer industry, decades of dedicated focus have enabled us to accumulate strong technical strength and even establish the fundamental standards for industry development. Covering the entire chain from breakthroughs in core technological innovation to large-scale production and delivery, we have built an independent ecological system. With leading and stable product performance as well as extremely reliable quality, we have become a trusted choice in the field of power grid construction.
This series of three-phase oil-immersed neutral earthing transformers is a customized core equipment specifically designed for medium- and high-voltage power systems, covering voltage classes from 20kV to 150kV and adopting a fully sealed oil-immersed structure. Through factory-customized production, the product can be flexibly configured according to the user's grid parameters, installation environment, and protection requirements, providing a reliable artificial neutral point solution for ungrounded or low-current grounded systems. It effectively suppresses arc grounding overvoltage and enhances grid operational stability and safety.
Basic Info
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.
Model NO. |
JDS |
Core |
Core-type Transformer |
Cooling Method |
Oil-immersed Type Transformer |
Winding Type |
Two-winding Transformer |
Certification |
ISO9001 |
Usage |
Power Transformer |
Frequency Characteristics |
Power Frequency |
Shape of Core |
Ring |
Brand |
Rockwill |
Transformer |
Earthing Transformer |
Rated Capacity |
100 kVA |
Color |
Grey or Customized |
Coil Material |
Copper |
Losses |
Low Losses |
Transformer Phase |
3 Phase |
Iron Core |
Power Transformer Core |
Transport Package |
Wooden Case |
Specification |
CTQC type tested |
Trademark |
Rockwill |
Origin |
Zhejiang, China |
HS Code |
85042100 |
Production Capacity |
5000MAV/Year |
Key Specifications
Model: JDS-100/20
Capacity: 100kVA
Voltage: 20kV
Frequency: 50/60Hz
Winding: Copper two-winding design
Core: Ring-shaped silicon steel
Cooling: ONAN (Oil Natural Air Natural)
Impedance: Low zero-sequence impedance (<10Ω)
Certification: ISO 9001, CTQC tested
Technical Advantages
Superior Grounding Performance
Specially designed winding configuration for optimal neutral point stability
Withstands 100A short-circuit current for 10 seconds
Low zero-sequence impedance ensures effective fault current diversion
Hermetically sealed corrugated tank prevents oil contamination
Mineral oil insulation with -30°C to +40°C operating range
Optional Midel 7131 ester fluid for enhanced fire safety
Heavy-gauge steel tank with anti-corrosion treatment
Precision-engineered core with reduced magnetic losses
Vibration-resistant mounting system
Standard Buchholz relay for internal fault detection
Pressure relief device for overload conditions
Oil level indicator with alarm contacts
Advanced Oil-Cooled Design
Robust Construction
Smart Protection Features
Application Scenarios
Industrial Power Systems
Ideal for manufacturing plants with sensitive equipment
Protects against ground faults in 20kV distribution networks
Suitable for harsh industrial environments
Wind farm collector substations
Solar park step-up stations
Biomass power generation facilities
Metro power supply systems
Airport electrical networks
Hospital backup power systems
Renewable Energy Installations
Infrastructure Projects
Why Choose Rockwill?
20+ years of transformer manufacturing expertise
Custom engineering support available
Complete type test reports provided
Global service network with 24/7 technical support
Environmentally conscious production processes
The auxiliary winding is an optional configuration of the earthing/grounding transformer. Its core function is to "provide low-voltage power for local loads in the substation", avoiding the additional configuration of a dedicated distribution transformer and reducing system cost. Its design follows the principle of "small capacity and standardization". Common specifications are: the voltage level can be 400V/230V (adapting to domestic and European standards) or 480V/277V (adapting to North American standards), and the capacity is usually no more than 200kVA, which can meet the power demand of auxiliary equipment such as control circuits, lighting and ventilation in the substation. It should be noted that the auxiliary winding only serves as an "auxiliary function" and does not affect the core grounding performance of the earthing/grounding transformer.
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IEEE 32: The dominant standard in North America, focusing on the "fault performance" of earthing/grounding transformers. It details the core requirements such as zero-sequence impedance test methods, short-time withstand current calculation, and mechanical strength verification, and is a key basis for the selection of high-voltage and extra-high voltage systems.
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IEC 60076 series: The core international general standard. Among them, IEC 60076-8 specifically regulates the winding design, impedance requirements and test methods of earthing/grounding transformers; IEC 60076-1 defines the general requirements for insulation media; IEC 60076-2 specifies the classification and performance indicators of cooling methods; IEC 60076-5 specifies the test specifications for short-time withstand capacity, forming a complete technical system.
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ANSI C57.12/IEC 60038: ANSI C57.12 supplements the manufacturing process requirements of earthing/grounding transformers in North America; IEC 60038 unifies the nominal values of voltage levels to ensure the compatibility of products from different countries.
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Domestic relevant standards: Such as GB/T 6451, which refers to the IEC 60076 series and puts forward supplementary requirements on efficiency, temperature rise and harmonic resistance according to the characteristics of China's power grid.
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Related Knowledges
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Can the secondary neutral of a control transformer be grounded?Grounding the secondary neutral of a control transformer is a complex topic involving multiple aspects such as electrical safety, system design, and maintenance.Reasons for Grounding the Secondary Neutral of a Control Transformer Safety considerations: Grounding provides a safe path for current to flow to earth in the event of a fault—such as insulation failure or overload—instead of passing through the human body or other conductive paths, thereby reducing the risk of electric shock. System sta12/05/2025 -
Wiring Methods and Parameters of Grounding TransformersGrounding Transformer Winding ConfigurationsGrounding transformers are classified by winding connection into two types: ZNyn (zigzag) or YNd. Their neutral points can be connected to an arc suppression coil or a grounding resistor. Currently, the zigzag (Z-type) grounding transformer connected via an arc suppression coil or a low-value resistor is more commonly used.1. Z-Type Grounding TransformerZ-type grounding transformers come in both oil-immersed and dry-type insulation versions. Among them12/05/2025 -
Why Do We Need a Grounding Transformer and Where Is It Used?Why Do We Need a Grounding Transformer?The grounding transformer is one of the most important devices in power systems, primarily used to connect or isolate the system neutral point to ground, thereby ensuring the safety and reliability of the power system. Below are several reasons why we need grounding transformers: Prevent Electrical Accidents:During the operation of a power system, abnormal conditions such as voltage leakage may occur in equipment or lines due to various reasons. If the neut12/05/2025 -
How to Implement Transformer Gap Protection & Standard Shutdown StepsHow to Implement Transformer Neutral Grounding Gap Protection Measures?In a certain power grid, when a single-phase ground fault occurs on a power supply line, both the transformer neutral grounding gap protection and the power supply line protection operate simultaneously, causing an outage of an otherwise healthy transformer. The main reason is that during a system single-phase ground fault, the zero-sequence overvoltage causes the transformer neutral grounding gap to break down. The resulting12/05/2025 -
GIS Dual Grounding & Direct Grounding: State Grid 2018 Anti-Accident Measures1. Regarding GIS, how should the requirement in Clause 14.1.1.4 of the State Grid’s "Eighteen Anti-Accident Measures" (2018 Edition) be understood?14.1.1.4: The neutral point of a transformer shall be connected to two different sides of the main mesh of the grounding grid via two grounding down conductors, and each grounding down conductor shall meet the thermal stability verification requirements. Main equipment and equipment structures shall each have two grounding down conductors connected to12/05/2025 -
Innovative & Common Winding Structures for 10kV High-Voltage High-Frequency Transformers1.Innovative Winding Structures for 10 kV-Class High-Voltage High-Frequency Transformers1.1 Zoned and Partially Potted Ventilated Structure Two U-shaped ferrite cores are mated to form a magnetic core unit, or further assembled into series/series-parallel core modules. Primary and secondary bobbins are mounted on the left and right straight legs of the core, respectively, with the core mating plane serving as the boundary layer. Windings of the same type are grouped on the same side. Litz wire i12/05/2025
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