| Marka | ROCKWILL |
| Seri | JDS |
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
Advanced Oil-Cooled Design
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
Robust Construction
Heavy-gauge steel tank with anti-corrosion treatment
Precision-engineered core with reduced magnetic losses
Vibration-resistant mounting system
Smart Protection Features
Standard Buchholz relay for internal fault detection
Pressure relief device for overload conditions
Oil level indicator with alarm contacts
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
Renewable Energy Installations
Wind farm collector substations
Solar park step-up stations
Biomass power generation facilities
Infrastructure Projects
Metro power supply systems
Airport electrical networks
Hospital backup power systems
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
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