| Merek | ROCKWILL |
| Seri | JDS |
Product Overview
As a pioneer and the first dedicated original equipment manufacturer (OEM) in China's neutral grounding transformer industry, we have laid the original benchmark for the industry's development with our profound technical strength accumulated through decades of intensive cultivation. From the independent R&D of core technologies to large-scale mass production, we have built a full-process independently controllable system. Relying on our stable and leading product performance and unparalleled reliability, we have become a preferred partner in the field of power grid construction.
Rockwill delivers reliable and high-performance earthing transformers designed for 66kV power systems. Our oil-immersed transformers are engineered to provide stable neutral grounding solutions while ensuring operational safety and system protection. Manufactured in compliance with international standards including IEC and GB, these transformers incorporate premium materials and rigorous quality control throughout production.
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.
Parameter |
Detail |
Parameter |
Details |
Cooling Method |
Oil-Immersed Type Transformer |
Core |
Core-type Transformer |
Certification |
ISO9001 |
Usage |
Power Transformer |
Frequency Characteristics |
Power Frequency |
Shape of Core |
Ring |
Brand |
Rockwill |
Item |
3 Phase Oil Type Earthing 6kv Power Transformer |
Primary Voltage |
66kv |
Secondary Voltage |
0.4kv |
Rating Capacity |
350kVA |
Transformer |
66kv Power Transformer |
Iron Core |
Wounded Core |
Coil Structure |
Isolation |
Loss |
Low Losses |
Tank Design |
Sealed |
Specification |
CTQC type tested |
Transport Package |
Wooden Case |
Origin |
Zhejiang China |
Trademark |
Rockwill |
Key Features
Voltage Class: 66kV system voltage (200 BIL)
Capacity Range: Standard units from 100kVA to 10,000kVA
Winding Configuration: Optimized zigzag (ZNyn) design
Cooling System: ONAN/OFAF cooling options
Insulation: Mineral oil or synthetic ester fluid
Construction:
Corrugated tank or radiator cooling
Hermetically sealed or conservator tank options
CRGO silicon steel core
Copper/aluminum windings
Technical Advantages
Enhanced Safety: Built-in Buchholz relay and pressure relief device
Low Impedance: Zero-sequence impedance <15Ω for effective fault current management
Durability: Corrosion-resistant paint system for outdoor installations
Efficiency: Reduced no-load losses through optimized core design
Flexibility: Off-circuit tap changer (±5% in 2.5% Steps)
Typical Applications
Utility Networks:
Neutral grounding for 66kV transmission systems
Arc suppression coil connections
Resistance grounding systems
Industrial Plants:
Petrochemical facilities
Mining operations
Steel manufacturing plants
Renewable Energy:
Wind farm collector stations
Solar PV substations
Hydroelectric plants
Performance Specifications
Temperature Range: -30°C to +40°C Ambient
Humidity: ≤95% Monthly Average
Altitude: Up to 2000m ASL
Sound Level: ≤75dB at 1m
Efficiency: ≥99.2% at Full Load
Testing Protocol
All units undergo comprehensive testing including:
Zero sequence impedance measurement
Induced overvoltage test (260Hz)
Lightning impulse test (350kV)
Temperature rise test (65K max.)
Oil dielectric strength test (≥50kV)
Service Conditions
Suitable for indoor/outdoor installation
Wind resistant up to 35m/s
Non-explosive environments
Seismic capability: 0.3g horizontal acceleration
Application Fields
66kV/88kV/110kV/132kV Power Distribution Network Construction
New Energy Power Plants (e.g., Wind Power/Photovoltaic)
Power Distribution Stations in Large Industrial Parks
Railway Traction Power Supply Systems
Urban Power Grid Upgrading and Renovation Projects
High-Voltage Power Supply Systems for Industrial and Mining Enterprises
Grounding Protection Projects of Regional Substations
Transformator earthing/grounding adalah jenis transformator khusus yang secara buatan menciptakan titik netral untuk sistem tenaga listrik yang tidak ter-ground atau ter-ground dengan arus rendah. Ia membangun sirkuit grounding melalui desain lilitan tertentu, dengan dua fungsi inti: pertama, menyediakan jalur impedansi rendah untuk arus sekuensial nol dalam sistem, memastikan bahwa arus gangguan mencapai ambang batas operasi perangkat perlindungan relai ketika terjadi gangguan ground fasa tunggal, memungkinkan penentuan dan isolasi gangguan yang cepat; kedua, menjaga keseimbangan tegangan sistem, menekan kenaikan tegangan berlebih pada fasa non-gangguan selama gangguan, dan melindungi keamanan isolasi peralatan jaringan listrik. Berbeda dengan transformator daya biasa, fungsi intinya adalah "membangun sirkuit grounding" daripada "transformasi tegangan", dan biasanya dirancang berdasarkan kapasitas beban singkat daripada kapasitas operasi kontinu.
Perbedaan antara keduanya berasal dari perbedaan mendasar dalam posisi fungsional, yang secara khusus tercermin dalam tiga aspek: ① Fungsi inti yang berbeda: transformator listrik biasa fokus pada transformasi tegangan dan transmisi energi, sementara transformator grounding/earthing fokus pada pembuatan titik netral dan penyediaan jalur arus sesat; ② Kalibrasi kapasitas yang berbeda: transformator listrik biasa ditandai dengan kapasitas operasi terus-menerus (kapasitas beban jangka panjang), sementara transformator grounding/earthing ditandai dengan kapasitas nominal waktu pendek (kapasitas yang dapat dibawa dalam waktu tertentu berdasarkan arus sesat dan waktu tahan, seperti 30 detik); ③ Desain gulungan yang berbeda: transformator grounding/earthing sebagian besar menggunakan struktur gulungan khusus seperti zigzag (ZN), sementara transformator listrik biasa sebagian besar menggunakan gulungan konvensional seperti bintang dan delta, dan transformator grounding/earthing biasanya tidak memiliki rasio transformasi tegangan tradisional.
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